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freebsd-dev/sys/kern/kern_mbuf.c

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Bring in mbuma to replace mballoc. mbuma is an Mbuf & Cluster allocator built on top of a number of extensions to the UMA framework, all included herein. Extensions to UMA worth noting: - Better layering between slab <-> zone caches; introduce Keg structure which splits off slab cache away from the zone structure and allows multiple zones to be stacked on top of a single Keg (single type of slab cache); perhaps we should look into defining a subset API on top of the Keg for special use by malloc(9), for example. - UMA_ZONE_REFCNT zones can now be added, and reference counters automagically allocated for them within the end of the associated slab structures. uma_find_refcnt() does a kextract to fetch the slab struct reference from the underlying page, and lookup the corresponding refcnt. mbuma things worth noting: - integrates mbuf & cluster allocations with extended UMA and provides caches for commonly-allocated items; defines several zones (two primary, one secondary) and two kegs. - change up certain code paths that always used to do: m_get() + m_clget() to instead just use m_getcl() and try to take advantage of the newly defined secondary Packet zone. - netstat(1) and systat(1) quickly hacked up to do basic stat reporting but additional stats work needs to be done once some other details within UMA have been taken care of and it becomes clearer to how stats will work within the modified framework. From the user perspective, one implication is that the NMBCLUSTERS compile-time option is no longer used. The maximum number of clusters is still capped off according to maxusers, but it can be made unlimited by setting the kern.ipc.nmbclusters boot-time tunable to zero. Work should be done to write an appropriate sysctl handler allowing dynamic tuning of kern.ipc.nmbclusters at runtime. Additional things worth noting/known issues (READ): - One report of 'ips' (ServeRAID) driver acting really slow in conjunction with mbuma. Need more data. Latest report is that ips is equally sucking with and without mbuma. - Giant leak in NFS code sometimes occurs, can't reproduce but currently analyzing; brueffer is able to reproduce but THIS IS NOT an mbuma-specific problem and currently occurs even WITHOUT mbuma. - Issues in network locking: there is at least one code path in the rip code where one or more locks are acquired and we end up in m_prepend() with M_WAITOK, which causes WITNESS to whine from within UMA. Current temporary solution: force all UMA allocations to be M_NOWAIT from within UMA for now to avoid deadlocks unless WITNESS is defined and we can determine with certainty that we're not holding any locks when we're M_WAITOK. - I've seen at least one weird socketbuffer empty-but- mbuf-still-attached panic. I don't believe this to be related to mbuma but please keep your eyes open, turn on debugging, and capture crash dumps. This change removes more code than it adds. A paper is available detailing the change and considering various performance issues, it was presented at BSDCan2004: http://www.unixdaemons.com/~bmilekic/netbuf_bmilekic.pdf Please read the paper for Future Work and implementation details, as well as credits. Testing and Debugging: rwatson, brueffer, Ketrien I. Saihr-Kesenchedra, ... Reviewed by: Lots of people (for different parts)
2004-05-31 21:46:06 +00:00
/*-
sys/kern: adoption of SPDX licensing ID tags. Mainly focus on files that use BSD 2-Clause license, however the tool I was using misidentified many licenses so this was mostly a manual - error prone - task. The Software Package Data Exchange (SPDX) group provides a specification to make it easier for automated tools to detect and summarize well known opensource licenses. We are gradually adopting the specification, noting that the tags are considered only advisory and do not, in any way, superceed or replace the license texts.
2017-11-27 15:20:12 +00:00
* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
*
Well, it seems that I pre-maturely removed the "All rights reserved" statement from some files, so re-add it for the moment, until the related legalese is sorted out. This change affects: sys/kern/kern_mbuf.c sys/vm/memguard.c sys/vm/memguard.h sys/vm/uma.h sys/vm/uma_core.c sys/vm/uma_dbg.c sys/vm/uma_dbg.h sys/vm/uma_int.h
2005-02-16 21:45:59 +00:00
* Copyright (c) 2004, 2005,
Style cleanups.
2012-12-07 22:19:41 +00:00
* Bosko Milekic <bmilekic@FreeBSD.org>. All rights reserved.
Bring in mbuma to replace mballoc. mbuma is an Mbuf & Cluster allocator built on top of a number of extensions to the UMA framework, all included herein. Extensions to UMA worth noting: - Better layering between slab <-> zone caches; introduce Keg structure which splits off slab cache away from the zone structure and allows multiple zones to be stacked on top of a single Keg (single type of slab cache); perhaps we should look into defining a subset API on top of the Keg for special use by malloc(9), for example. - UMA_ZONE_REFCNT zones can now be added, and reference counters automagically allocated for them within the end of the associated slab structures. uma_find_refcnt() does a kextract to fetch the slab struct reference from the underlying page, and lookup the corresponding refcnt. mbuma things worth noting: - integrates mbuf & cluster allocations with extended UMA and provides caches for commonly-allocated items; defines several zones (two primary, one secondary) and two kegs. - change up certain code paths that always used to do: m_get() + m_clget() to instead just use m_getcl() and try to take advantage of the newly defined secondary Packet zone. - netstat(1) and systat(1) quickly hacked up to do basic stat reporting but additional stats work needs to be done once some other details within UMA have been taken care of and it becomes clearer to how stats will work within the modified framework. From the user perspective, one implication is that the NMBCLUSTERS compile-time option is no longer used. The maximum number of clusters is still capped off according to maxusers, but it can be made unlimited by setting the kern.ipc.nmbclusters boot-time tunable to zero. Work should be done to write an appropriate sysctl handler allowing dynamic tuning of kern.ipc.nmbclusters at runtime. Additional things worth noting/known issues (READ): - One report of 'ips' (ServeRAID) driver acting really slow in conjunction with mbuma. Need more data. Latest report is that ips is equally sucking with and without mbuma. - Giant leak in NFS code sometimes occurs, can't reproduce but currently analyzing; brueffer is able to reproduce but THIS IS NOT an mbuma-specific problem and currently occurs even WITHOUT mbuma. - Issues in network locking: there is at least one code path in the rip code where one or more locks are acquired and we end up in m_prepend() with M_WAITOK, which causes WITNESS to whine from within UMA. Current temporary solution: force all UMA allocations to be M_NOWAIT from within UMA for now to avoid deadlocks unless WITNESS is defined and we can determine with certainty that we're not holding any locks when we're M_WAITOK. - I've seen at least one weird socketbuffer empty-but- mbuf-still-attached panic. I don't believe this to be related to mbuma but please keep your eyes open, turn on debugging, and capture crash dumps. This change removes more code than it adds. A paper is available detailing the change and considering various performance issues, it was presented at BSDCan2004: http://www.unixdaemons.com/~bmilekic/netbuf_bmilekic.pdf Please read the paper for Future Work and implementation details, as well as credits. Testing and Debugging: rwatson, brueffer, Ketrien I. Saihr-Kesenchedra, ... Reviewed by: Lots of people (for different parts)
2004-05-31 21:46:06 +00:00
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice unmodified, this list of conditions and the following
* disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include "opt_param.h"
Add kernel-side support for in-kernel TLS. KTLS adds support for in-kernel framing and encryption of Transport Layer Security (1.0-1.2) data on TCP sockets. KTLS only supports offload of TLS for transmitted data. Key negotation must still be performed in userland. Once completed, transmit session keys for a connection are provided to the kernel via a new TCP_TXTLS_ENABLE socket option. All subsequent data transmitted on the socket is placed into TLS frames and encrypted using the supplied keys. Any data written to a KTLS-enabled socket via write(2), aio_write(2), or sendfile(2) is assumed to be application data and is encoded in TLS frames with an application data type. Individual records can be sent with a custom type (e.g. handshake messages) via sendmsg(2) with a new control message (TLS_SET_RECORD_TYPE) specifying the record type. At present, rekeying is not supported though the in-kernel framework should support rekeying. KTLS makes use of the recently added unmapped mbufs to store TLS frames in the socket buffer. Each TLS frame is described by a single ext_pgs mbuf. The ext_pgs structure contains the header of the TLS record (and trailer for encrypted records) as well as references to the associated TLS session. KTLS supports two primary methods of encrypting TLS frames: software TLS and ifnet TLS. Software TLS marks mbufs holding socket data as not ready via M_NOTREADY similar to sendfile(2) when TLS framing information is added to an unmapped mbuf in ktls_frame(). ktls_enqueue() is then called to schedule TLS frames for encryption. In the case of sendfile_iodone() calls ktls_enqueue() instead of pru_ready() leaving the mbufs marked M_NOTREADY until encryption is completed. For other writes (vn_sendfile when pages are available, write(2), etc.), the PRUS_NOTREADY is set when invoking pru_send() along with invoking ktls_enqueue(). A pool of worker threads (the "KTLS" kernel process) encrypts TLS frames queued via ktls_enqueue(). Each TLS frame is temporarily mapped using the direct map and passed to a software encryption backend to perform the actual encryption. (Note: The use of PHYS_TO_DMAP could be replaced with sf_bufs if someone wished to make this work on architectures without a direct map.) KTLS supports pluggable software encryption backends. Internally, Netflix uses proprietary pure-software backends. This commit includes a simple backend in a new ktls_ocf.ko module that uses the kernel's OpenCrypto framework to provide AES-GCM encryption of TLS frames. As a result, software TLS is now a bit of a misnomer as it can make use of hardware crypto accelerators. Once software encryption has finished, the TLS frame mbufs are marked ready via pru_ready(). At this point, the encrypted data appears as regular payload to the TCP stack stored in unmapped mbufs. ifnet TLS permits a NIC to offload the TLS encryption and TCP segmentation. In this mode, a new send tag type (IF_SND_TAG_TYPE_TLS) is allocated on the interface a socket is routed over and associated with a TLS session. TLS records for a TLS session using ifnet TLS are not marked M_NOTREADY but are passed down the stack unencrypted. The ip_output_send() and ip6_output_send() helper functions that apply send tags to outbound IP packets verify that the send tag of the TLS record matches the outbound interface. If so, the packet is tagged with the TLS send tag and sent to the interface. The NIC device driver must recognize packets with the TLS send tag and schedule them for TLS encryption and TCP segmentation. If the the outbound interface does not match the interface in the TLS send tag, the packet is dropped. In addition, a task is scheduled to refresh the TLS send tag for the TLS session. If a new TLS send tag cannot be allocated, the connection is dropped. If a new TLS send tag is allocated, however, subsequent packets will be tagged with the correct TLS send tag. (This latter case has been tested by configuring both ports of a Chelsio T6 in a lagg and failing over from one port to another. As the connections migrated to the new port, new TLS send tags were allocated for the new port and connections resumed without being dropped.) ifnet TLS can be enabled and disabled on supported network interfaces via new '[-]txtls[46]' options to ifconfig(8). ifnet TLS is supported across both vlan devices and lagg interfaces using failover, lacp with flowid enabled, or lacp with flowid enabled. Applications may request the current KTLS mode of a connection via a new TCP_TXTLS_MODE socket option. They can also use this socket option to toggle between software and ifnet TLS modes. In addition, a testing tool is available in tools/tools/switch_tls. This is modeled on tcpdrop and uses similar syntax. However, instead of dropping connections, -s is used to force KTLS connections to switch to software TLS and -i is used to switch to ifnet TLS. Various sysctls and counters are available under the kern.ipc.tls sysctl node. The kern.ipc.tls.enable node must be set to true to enable KTLS (it is off by default). The use of unmapped mbufs must also be enabled via kern.ipc.mb_use_ext_pgs to enable KTLS. KTLS is enabled via the KERN_TLS kernel option. This patch is the culmination of years of work by several folks including Scott Long and Randall Stewart for the original design and implementation; Drew Gallatin for several optimizations including the use of ext_pgs mbufs, the M_NOTREADY mechanism for TLS records awaiting software encryption, and pluggable software crypto backends; and John Baldwin for modifications to support hardware TLS offload. Reviewed by: gallatin, hselasky, rrs Obtained from: Netflix Sponsored by: Netflix, Chelsio Communications Differential Revision: https://reviews.freebsd.org/D21277
2019-08-27 00:01:56 +00:00
#include "opt_kern_tls.h"
Bring in mbuma to replace mballoc. mbuma is an Mbuf & Cluster allocator built on top of a number of extensions to the UMA framework, all included herein. Extensions to UMA worth noting: - Better layering between slab <-> zone caches; introduce Keg structure which splits off slab cache away from the zone structure and allows multiple zones to be stacked on top of a single Keg (single type of slab cache); perhaps we should look into defining a subset API on top of the Keg for special use by malloc(9), for example. - UMA_ZONE_REFCNT zones can now be added, and reference counters automagically allocated for them within the end of the associated slab structures. uma_find_refcnt() does a kextract to fetch the slab struct reference from the underlying page, and lookup the corresponding refcnt. mbuma things worth noting: - integrates mbuf & cluster allocations with extended UMA and provides caches for commonly-allocated items; defines several zones (two primary, one secondary) and two kegs. - change up certain code paths that always used to do: m_get() + m_clget() to instead just use m_getcl() and try to take advantage of the newly defined secondary Packet zone. - netstat(1) and systat(1) quickly hacked up to do basic stat reporting but additional stats work needs to be done once some other details within UMA have been taken care of and it becomes clearer to how stats will work within the modified framework. From the user perspective, one implication is that the NMBCLUSTERS compile-time option is no longer used. The maximum number of clusters is still capped off according to maxusers, but it can be made unlimited by setting the kern.ipc.nmbclusters boot-time tunable to zero. Work should be done to write an appropriate sysctl handler allowing dynamic tuning of kern.ipc.nmbclusters at runtime. Additional things worth noting/known issues (READ): - One report of 'ips' (ServeRAID) driver acting really slow in conjunction with mbuma. Need more data. Latest report is that ips is equally sucking with and without mbuma. - Giant leak in NFS code sometimes occurs, can't reproduce but currently analyzing; brueffer is able to reproduce but THIS IS NOT an mbuma-specific problem and currently occurs even WITHOUT mbuma. - Issues in network locking: there is at least one code path in the rip code where one or more locks are acquired and we end up in m_prepend() with M_WAITOK, which causes WITNESS to whine from within UMA. Current temporary solution: force all UMA allocations to be M_NOWAIT from within UMA for now to avoid deadlocks unless WITNESS is defined and we can determine with certainty that we're not holding any locks when we're M_WAITOK. - I've seen at least one weird socketbuffer empty-but- mbuf-still-attached panic. I don't believe this to be related to mbuma but please keep your eyes open, turn on debugging, and capture crash dumps. This change removes more code than it adds. A paper is available detailing the change and considering various performance issues, it was presented at BSDCan2004: http://www.unixdaemons.com/~bmilekic/netbuf_bmilekic.pdf Please read the paper for Future Work and implementation details, as well as credits. Testing and Debugging: rwatson, brueffer, Ketrien I. Saihr-Kesenchedra, ... Reviewed by: Lots of people (for different parts)
2004-05-31 21:46:06 +00:00
#include <sys/param.h>
netdump: Zone mbufs should be allocated before dump Reviewed by: markj Sponsored by: Dell EMC Isilon Differential Revision: https://reviews.freebsd.org/D17306
2018-10-20 22:24:58 +00:00
#include <sys/conf.h>
Add malloc_domainset(9) and _domainset variants to other allocator KPIs. Remove malloc_domain(9) and most other _domain KPIs added in r327900. The new functions allow the caller to specify a general NUMA domain selection policy, rather than specifically requesting an allocation from a specific domain. The latter policy tends to interact poorly with M_WAITOK, resulting in situations where a caller is blocked indefinitely because the specified domain is depleted. Most existing consumers of the _domain KPIs are converted to instead use a DOMAINSET_PREF() policy, in which we fall back to other domains to satisfy the allocation request. This change also defines a set of DOMAINSET_FIXED() policies, which only permit allocations from the specified domain. Discussed with: gallatin, jeff Reported and tested by: pho (previous version) MFC after: 2 weeks Sponsored by: The FreeBSD Foundation Differential Revision: https://reviews.freebsd.org/D17418
2018-10-30 18:26:34 +00:00
#include <sys/domainset.h>
Bring in mbuma to replace mballoc. mbuma is an Mbuf & Cluster allocator built on top of a number of extensions to the UMA framework, all included herein. Extensions to UMA worth noting: - Better layering between slab <-> zone caches; introduce Keg structure which splits off slab cache away from the zone structure and allows multiple zones to be stacked on top of a single Keg (single type of slab cache); perhaps we should look into defining a subset API on top of the Keg for special use by malloc(9), for example. - UMA_ZONE_REFCNT zones can now be added, and reference counters automagically allocated for them within the end of the associated slab structures. uma_find_refcnt() does a kextract to fetch the slab struct reference from the underlying page, and lookup the corresponding refcnt. mbuma things worth noting: - integrates mbuf & cluster allocations with extended UMA and provides caches for commonly-allocated items; defines several zones (two primary, one secondary) and two kegs. - change up certain code paths that always used to do: m_get() + m_clget() to instead just use m_getcl() and try to take advantage of the newly defined secondary Packet zone. - netstat(1) and systat(1) quickly hacked up to do basic stat reporting but additional stats work needs to be done once some other details within UMA have been taken care of and it becomes clearer to how stats will work within the modified framework. From the user perspective, one implication is that the NMBCLUSTERS compile-time option is no longer used. The maximum number of clusters is still capped off according to maxusers, but it can be made unlimited by setting the kern.ipc.nmbclusters boot-time tunable to zero. Work should be done to write an appropriate sysctl handler allowing dynamic tuning of kern.ipc.nmbclusters at runtime. Additional things worth noting/known issues (READ): - One report of 'ips' (ServeRAID) driver acting really slow in conjunction with mbuma. Need more data. Latest report is that ips is equally sucking with and without mbuma. - Giant leak in NFS code sometimes occurs, can't reproduce but currently analyzing; brueffer is able to reproduce but THIS IS NOT an mbuma-specific problem and currently occurs even WITHOUT mbuma. - Issues in network locking: there is at least one code path in the rip code where one or more locks are acquired and we end up in m_prepend() with M_WAITOK, which causes WITNESS to whine from within UMA. Current temporary solution: force all UMA allocations to be M_NOWAIT from within UMA for now to avoid deadlocks unless WITNESS is defined and we can determine with certainty that we're not holding any locks when we're M_WAITOK. - I've seen at least one weird socketbuffer empty-but- mbuf-still-attached panic. I don't believe this to be related to mbuma but please keep your eyes open, turn on debugging, and capture crash dumps. This change removes more code than it adds. A paper is available detailing the change and considering various performance issues, it was presented at BSDCan2004: http://www.unixdaemons.com/~bmilekic/netbuf_bmilekic.pdf Please read the paper for Future Work and implementation details, as well as credits. Testing and Debugging: rwatson, brueffer, Ketrien I. Saihr-Kesenchedra, ... Reviewed by: Lots of people (for different parts)
2004-05-31 21:46:06 +00:00
#include <sys/malloc.h>
#include <sys/systm.h>
#include <sys/mbuf.h>
#include <sys/domain.h>
#include <sys/eventhandler.h>
#include <sys/kernel.h>
Add kernel-side support for in-kernel TLS. KTLS adds support for in-kernel framing and encryption of Transport Layer Security (1.0-1.2) data on TCP sockets. KTLS only supports offload of TLS for transmitted data. Key negotation must still be performed in userland. Once completed, transmit session keys for a connection are provided to the kernel via a new TCP_TXTLS_ENABLE socket option. All subsequent data transmitted on the socket is placed into TLS frames and encrypted using the supplied keys. Any data written to a KTLS-enabled socket via write(2), aio_write(2), or sendfile(2) is assumed to be application data and is encoded in TLS frames with an application data type. Individual records can be sent with a custom type (e.g. handshake messages) via sendmsg(2) with a new control message (TLS_SET_RECORD_TYPE) specifying the record type. At present, rekeying is not supported though the in-kernel framework should support rekeying. KTLS makes use of the recently added unmapped mbufs to store TLS frames in the socket buffer. Each TLS frame is described by a single ext_pgs mbuf. The ext_pgs structure contains the header of the TLS record (and trailer for encrypted records) as well as references to the associated TLS session. KTLS supports two primary methods of encrypting TLS frames: software TLS and ifnet TLS. Software TLS marks mbufs holding socket data as not ready via M_NOTREADY similar to sendfile(2) when TLS framing information is added to an unmapped mbuf in ktls_frame(). ktls_enqueue() is then called to schedule TLS frames for encryption. In the case of sendfile_iodone() calls ktls_enqueue() instead of pru_ready() leaving the mbufs marked M_NOTREADY until encryption is completed. For other writes (vn_sendfile when pages are available, write(2), etc.), the PRUS_NOTREADY is set when invoking pru_send() along with invoking ktls_enqueue(). A pool of worker threads (the "KTLS" kernel process) encrypts TLS frames queued via ktls_enqueue(). Each TLS frame is temporarily mapped using the direct map and passed to a software encryption backend to perform the actual encryption. (Note: The use of PHYS_TO_DMAP could be replaced with sf_bufs if someone wished to make this work on architectures without a direct map.) KTLS supports pluggable software encryption backends. Internally, Netflix uses proprietary pure-software backends. This commit includes a simple backend in a new ktls_ocf.ko module that uses the kernel's OpenCrypto framework to provide AES-GCM encryption of TLS frames. As a result, software TLS is now a bit of a misnomer as it can make use of hardware crypto accelerators. Once software encryption has finished, the TLS frame mbufs are marked ready via pru_ready(). At this point, the encrypted data appears as regular payload to the TCP stack stored in unmapped mbufs. ifnet TLS permits a NIC to offload the TLS encryption and TCP segmentation. In this mode, a new send tag type (IF_SND_TAG_TYPE_TLS) is allocated on the interface a socket is routed over and associated with a TLS session. TLS records for a TLS session using ifnet TLS are not marked M_NOTREADY but are passed down the stack unencrypted. The ip_output_send() and ip6_output_send() helper functions that apply send tags to outbound IP packets verify that the send tag of the TLS record matches the outbound interface. If so, the packet is tagged with the TLS send tag and sent to the interface. The NIC device driver must recognize packets with the TLS send tag and schedule them for TLS encryption and TCP segmentation. If the the outbound interface does not match the interface in the TLS send tag, the packet is dropped. In addition, a task is scheduled to refresh the TLS send tag for the TLS session. If a new TLS send tag cannot be allocated, the connection is dropped. If a new TLS send tag is allocated, however, subsequent packets will be tagged with the correct TLS send tag. (This latter case has been tested by configuring both ports of a Chelsio T6 in a lagg and failing over from one port to another. As the connections migrated to the new port, new TLS send tags were allocated for the new port and connections resumed without being dropped.) ifnet TLS can be enabled and disabled on supported network interfaces via new '[-]txtls[46]' options to ifconfig(8). ifnet TLS is supported across both vlan devices and lagg interfaces using failover, lacp with flowid enabled, or lacp with flowid enabled. Applications may request the current KTLS mode of a connection via a new TCP_TXTLS_MODE socket option. They can also use this socket option to toggle between software and ifnet TLS modes. In addition, a testing tool is available in tools/tools/switch_tls. This is modeled on tcpdrop and uses similar syntax. However, instead of dropping connections, -s is used to force KTLS connections to switch to software TLS and -i is used to switch to ifnet TLS. Various sysctls and counters are available under the kern.ipc.tls sysctl node. The kern.ipc.tls.enable node must be set to true to enable KTLS (it is off by default). The use of unmapped mbufs must also be enabled via kern.ipc.mb_use_ext_pgs to enable KTLS. KTLS is enabled via the KERN_TLS kernel option. This patch is the culmination of years of work by several folks including Scott Long and Randall Stewart for the original design and implementation; Drew Gallatin for several optimizations including the use of ext_pgs mbufs, the M_NOTREADY mechanism for TLS records awaiting software encryption, and pluggable software crypto backends; and John Baldwin for modifications to support hardware TLS offload. Reviewed by: gallatin, hselasky, rrs Obtained from: Netflix Sponsored by: Netflix, Chelsio Communications Differential Revision: https://reviews.freebsd.org/D21277
2019-08-27 00:01:56 +00:00
#include <sys/ktls.h>
Add an mbuf allocator for netdump. The aim is to permit mbuf allocations after a panic without calling into the page allocator, without imposing any runtime overhead during regular operation of the system, and without modifying driver code. The approach taken is to preallocate a number of mbufs and clusters, storing them in linked lists, and using the lists to back some UMA cache zones. At panic time, the mbuf and cluster zone pointers are overwritten with those of the cache zones so that the mbuf allocator returns preallocated items. Using this scheme, drivers which cache mbuf zone pointers from m_getzone() require special handling when implementing netdump support. Reviewed by: cem (earlier version), julian, sbruno MFC after: 1 month Sponsored by: Dell EMC Isilon Differential Revision: https://reviews.freebsd.org/D15251
2018-05-06 00:19:48 +00:00
#include <sys/limits.h>
Add a safety net to reclaim mbufs when one of the mbuf zones become exhausted. It is possible for a bug in the code (or, theoretically, even unusual network conditions) to exhaust all possible mbufs or mbuf clusters. When this occurs, things can grind to a halt fairly quickly. However, we currently do not call mb_reclaim() unless the entire system is experiencing a low-memory condition. While it is best to try to prevent exhaustion of one of the mbuf zones, it would also be useful to have a mechanism to attempt to recover from these situations by freeing "expendable" mbufs. This patch makes two changes: a) The patch adds a generic API to the UMA zone allocator to set a function that should be called when an allocation fails because the zone limit has been reached. Because of the way this function can be called, it really should do minimal work. b) The patch uses this API to try to free mbufs when an allocation fails from one of the mbuf zones because the zone limit has been reached. The function schedules a callout to run mb_reclaim(). Differential Revision: https://reviews.freebsd.org/D3864 Reviewed by: gnn Comments by: rrs, glebius MFC after: 2 weeks Sponsored by: Juniper Networks
2015-12-20 02:05:33 +00:00
#include <sys/lock.h>
#include <sys/mutex.h>
Bring in mbuma to replace mballoc. mbuma is an Mbuf & Cluster allocator built on top of a number of extensions to the UMA framework, all included herein. Extensions to UMA worth noting: - Better layering between slab <-> zone caches; introduce Keg structure which splits off slab cache away from the zone structure and allows multiple zones to be stacked on top of a single Keg (single type of slab cache); perhaps we should look into defining a subset API on top of the Keg for special use by malloc(9), for example. - UMA_ZONE_REFCNT zones can now be added, and reference counters automagically allocated for them within the end of the associated slab structures. uma_find_refcnt() does a kextract to fetch the slab struct reference from the underlying page, and lookup the corresponding refcnt. mbuma things worth noting: - integrates mbuf & cluster allocations with extended UMA and provides caches for commonly-allocated items; defines several zones (two primary, one secondary) and two kegs. - change up certain code paths that always used to do: m_get() + m_clget() to instead just use m_getcl() and try to take advantage of the newly defined secondary Packet zone. - netstat(1) and systat(1) quickly hacked up to do basic stat reporting but additional stats work needs to be done once some other details within UMA have been taken care of and it becomes clearer to how stats will work within the modified framework. From the user perspective, one implication is that the NMBCLUSTERS compile-time option is no longer used. The maximum number of clusters is still capped off according to maxusers, but it can be made unlimited by setting the kern.ipc.nmbclusters boot-time tunable to zero. Work should be done to write an appropriate sysctl handler allowing dynamic tuning of kern.ipc.nmbclusters at runtime. Additional things worth noting/known issues (READ): - One report of 'ips' (ServeRAID) driver acting really slow in conjunction with mbuma. Need more data. Latest report is that ips is equally sucking with and without mbuma. - Giant leak in NFS code sometimes occurs, can't reproduce but currently analyzing; brueffer is able to reproduce but THIS IS NOT an mbuma-specific problem and currently occurs even WITHOUT mbuma. - Issues in network locking: there is at least one code path in the rip code where one or more locks are acquired and we end up in m_prepend() with M_WAITOK, which causes WITNESS to whine from within UMA. Current temporary solution: force all UMA allocations to be M_NOWAIT from within UMA for now to avoid deadlocks unless WITNESS is defined and we can determine with certainty that we're not holding any locks when we're M_WAITOK. - I've seen at least one weird socketbuffer empty-but- mbuf-still-attached panic. I don't believe this to be related to mbuma but please keep your eyes open, turn on debugging, and capture crash dumps. This change removes more code than it adds. A paper is available detailing the change and considering various performance issues, it was presented at BSDCan2004: http://www.unixdaemons.com/~bmilekic/netbuf_bmilekic.pdf Please read the paper for Future Work and implementation details, as well as credits. Testing and Debugging: rwatson, brueffer, Ketrien I. Saihr-Kesenchedra, ... Reviewed by: Lots of people (for different parts)
2004-05-31 21:46:06 +00:00
#include <sys/protosw.h>
Add kernel-side support for in-kernel TLS. KTLS adds support for in-kernel framing and encryption of Transport Layer Security (1.0-1.2) data on TCP sockets. KTLS only supports offload of TLS for transmitted data. Key negotation must still be performed in userland. Once completed, transmit session keys for a connection are provided to the kernel via a new TCP_TXTLS_ENABLE socket option. All subsequent data transmitted on the socket is placed into TLS frames and encrypted using the supplied keys. Any data written to a KTLS-enabled socket via write(2), aio_write(2), or sendfile(2) is assumed to be application data and is encoded in TLS frames with an application data type. Individual records can be sent with a custom type (e.g. handshake messages) via sendmsg(2) with a new control message (TLS_SET_RECORD_TYPE) specifying the record type. At present, rekeying is not supported though the in-kernel framework should support rekeying. KTLS makes use of the recently added unmapped mbufs to store TLS frames in the socket buffer. Each TLS frame is described by a single ext_pgs mbuf. The ext_pgs structure contains the header of the TLS record (and trailer for encrypted records) as well as references to the associated TLS session. KTLS supports two primary methods of encrypting TLS frames: software TLS and ifnet TLS. Software TLS marks mbufs holding socket data as not ready via M_NOTREADY similar to sendfile(2) when TLS framing information is added to an unmapped mbuf in ktls_frame(). ktls_enqueue() is then called to schedule TLS frames for encryption. In the case of sendfile_iodone() calls ktls_enqueue() instead of pru_ready() leaving the mbufs marked M_NOTREADY until encryption is completed. For other writes (vn_sendfile when pages are available, write(2), etc.), the PRUS_NOTREADY is set when invoking pru_send() along with invoking ktls_enqueue(). A pool of worker threads (the "KTLS" kernel process) encrypts TLS frames queued via ktls_enqueue(). Each TLS frame is temporarily mapped using the direct map and passed to a software encryption backend to perform the actual encryption. (Note: The use of PHYS_TO_DMAP could be replaced with sf_bufs if someone wished to make this work on architectures without a direct map.) KTLS supports pluggable software encryption backends. Internally, Netflix uses proprietary pure-software backends. This commit includes a simple backend in a new ktls_ocf.ko module that uses the kernel's OpenCrypto framework to provide AES-GCM encryption of TLS frames. As a result, software TLS is now a bit of a misnomer as it can make use of hardware crypto accelerators. Once software encryption has finished, the TLS frame mbufs are marked ready via pru_ready(). At this point, the encrypted data appears as regular payload to the TCP stack stored in unmapped mbufs. ifnet TLS permits a NIC to offload the TLS encryption and TCP segmentation. In this mode, a new send tag type (IF_SND_TAG_TYPE_TLS) is allocated on the interface a socket is routed over and associated with a TLS session. TLS records for a TLS session using ifnet TLS are not marked M_NOTREADY but are passed down the stack unencrypted. The ip_output_send() and ip6_output_send() helper functions that apply send tags to outbound IP packets verify that the send tag of the TLS record matches the outbound interface. If so, the packet is tagged with the TLS send tag and sent to the interface. The NIC device driver must recognize packets with the TLS send tag and schedule them for TLS encryption and TCP segmentation. If the the outbound interface does not match the interface in the TLS send tag, the packet is dropped. In addition, a task is scheduled to refresh the TLS send tag for the TLS session. If a new TLS send tag cannot be allocated, the connection is dropped. If a new TLS send tag is allocated, however, subsequent packets will be tagged with the correct TLS send tag. (This latter case has been tested by configuring both ports of a Chelsio T6 in a lagg and failing over from one port to another. As the connections migrated to the new port, new TLS send tags were allocated for the new port and connections resumed without being dropped.) ifnet TLS can be enabled and disabled on supported network interfaces via new '[-]txtls[46]' options to ifconfig(8). ifnet TLS is supported across both vlan devices and lagg interfaces using failover, lacp with flowid enabled, or lacp with flowid enabled. Applications may request the current KTLS mode of a connection via a new TCP_TXTLS_MODE socket option. They can also use this socket option to toggle between software and ifnet TLS modes. In addition, a testing tool is available in tools/tools/switch_tls. This is modeled on tcpdrop and uses similar syntax. However, instead of dropping connections, -s is used to force KTLS connections to switch to software TLS and -i is used to switch to ifnet TLS. Various sysctls and counters are available under the kern.ipc.tls sysctl node. The kern.ipc.tls.enable node must be set to true to enable KTLS (it is off by default). The use of unmapped mbufs must also be enabled via kern.ipc.mb_use_ext_pgs to enable KTLS. KTLS is enabled via the KERN_TLS kernel option. This patch is the culmination of years of work by several folks including Scott Long and Randall Stewart for the original design and implementation; Drew Gallatin for several optimizations including the use of ext_pgs mbufs, the M_NOTREADY mechanism for TLS records awaiting software encryption, and pluggable software crypto backends; and John Baldwin for modifications to support hardware TLS offload. Reviewed by: gallatin, hselasky, rrs Obtained from: Netflix Sponsored by: Netflix, Chelsio Communications Differential Revision: https://reviews.freebsd.org/D21277
2019-08-27 00:01:56 +00:00
#include <sys/refcount.h>
Add an external mbuf buffer type that holds multiple unmapped pages. Unmapped mbufs allow sendfile to carry multiple pages of data in a single mbuf, without mapping those pages. It is a requirement for Netflix's in-kernel TLS, and provides a 5-10% CPU savings on heavy web serving workloads when used by sendfile, due to effectively compressing socket buffers by an order of magnitude, and hence reducing cache misses. For this new external mbuf buffer type (EXT_PGS), the ext_buf pointer now points to a struct mbuf_ext_pgs structure instead of a data buffer. This structure contains an array of physical addresses (this reduces cache misses compared to an earlier version that stored an array of vm_page_t pointers). It also stores additional fields needed for in-kernel TLS such as the TLS header and trailer data that are currently unused. To more easily detect these mbufs, the M_NOMAP flag is set in m_flags in addition to M_EXT. Various functions like m_copydata() have been updated to safely access packet contents (using uiomove_fromphys()), to make things like BPF safe. NIC drivers advertise support for unmapped mbufs on transmit via a new IFCAP_NOMAP capability. This capability can be toggled via the new 'nomap' and '-nomap' ifconfig(8) commands. For NIC drivers that only transmit packet contents via DMA and use bus_dma, adding the capability to if_capabilities and if_capenable should be all that is required. If a NIC does not support unmapped mbufs, they are converted to a chain of mapped mbufs (using sf_bufs to provide the mapping) in ip_output or ip6_output. If an unmapped mbuf requires software checksums, it is also converted to a chain of mapped mbufs before computing the checksum. Submitted by: gallatin (earlier version) Reviewed by: gallatin, hselasky, rrs Discussed with: ae, kp (firewalls) Relnotes: yes Sponsored by: Netflix Differential Revision: https://reviews.freebsd.org/D20616
2019-06-29 00:48:33 +00:00
#include <sys/sf_buf.h>
Bring in mbuma to replace mballoc. mbuma is an Mbuf & Cluster allocator built on top of a number of extensions to the UMA framework, all included herein. Extensions to UMA worth noting: - Better layering between slab <-> zone caches; introduce Keg structure which splits off slab cache away from the zone structure and allows multiple zones to be stacked on top of a single Keg (single type of slab cache); perhaps we should look into defining a subset API on top of the Keg for special use by malloc(9), for example. - UMA_ZONE_REFCNT zones can now be added, and reference counters automagically allocated for them within the end of the associated slab structures. uma_find_refcnt() does a kextract to fetch the slab struct reference from the underlying page, and lookup the corresponding refcnt. mbuma things worth noting: - integrates mbuf & cluster allocations with extended UMA and provides caches for commonly-allocated items; defines several zones (two primary, one secondary) and two kegs. - change up certain code paths that always used to do: m_get() + m_clget() to instead just use m_getcl() and try to take advantage of the newly defined secondary Packet zone. - netstat(1) and systat(1) quickly hacked up to do basic stat reporting but additional stats work needs to be done once some other details within UMA have been taken care of and it becomes clearer to how stats will work within the modified framework. From the user perspective, one implication is that the NMBCLUSTERS compile-time option is no longer used. The maximum number of clusters is still capped off according to maxusers, but it can be made unlimited by setting the kern.ipc.nmbclusters boot-time tunable to zero. Work should be done to write an appropriate sysctl handler allowing dynamic tuning of kern.ipc.nmbclusters at runtime. Additional things worth noting/known issues (READ): - One report of 'ips' (ServeRAID) driver acting really slow in conjunction with mbuma. Need more data. Latest report is that ips is equally sucking with and without mbuma. - Giant leak in NFS code sometimes occurs, can't reproduce but currently analyzing; brueffer is able to reproduce but THIS IS NOT an mbuma-specific problem and currently occurs even WITHOUT mbuma. - Issues in network locking: there is at least one code path in the rip code where one or more locks are acquired and we end up in m_prepend() with M_WAITOK, which causes WITNESS to whine from within UMA. Current temporary solution: force all UMA allocations to be M_NOWAIT from within UMA for now to avoid deadlocks unless WITNESS is defined and we can determine with certainty that we're not holding any locks when we're M_WAITOK. - I've seen at least one weird socketbuffer empty-but- mbuf-still-attached panic. I don't believe this to be related to mbuma but please keep your eyes open, turn on debugging, and capture crash dumps. This change removes more code than it adds. A paper is available detailing the change and considering various performance issues, it was presented at BSDCan2004: http://www.unixdaemons.com/~bmilekic/netbuf_bmilekic.pdf Please read the paper for Future Work and implementation details, as well as credits. Testing and Debugging: rwatson, brueffer, Ketrien I. Saihr-Kesenchedra, ... Reviewed by: Lots of people (for different parts)
2004-05-31 21:46:06 +00:00
#include <sys/smp.h>
Restructure mbuf send tags to provide stronger guarantees. - Perform ifp mismatch checks (to determine if a send tag is allocated for a different ifp than the one the packet is being output on), in ip_output() and ip6_output(). This avoids sending packets with send tags to ifnet drivers that don't support send tags. Since we are now checking for ifp mismatches before invoking if_output, we can now try to allocate a new tag before invoking if_output sending the original packet on the new tag if allocation succeeds. To avoid code duplication for the fragment and unfragmented cases, add ip_output_send() and ip6_output_send() as wrappers around if_output and nd6_output_ifp, respectively. All of the logic for setting send tags and dealing with send tag-related errors is done in these wrapper functions. For pseudo interfaces that wrap other network interfaces (vlan and lagg), wrapper send tags are now allocated so that ip*_output see the wrapper ifp as the ifp in the send tag. The if_transmit routines rewrite the send tags after performing an ifp mismatch check. If an ifp mismatch is detected, the transmit routines fail with EAGAIN. - To provide clearer life cycle management of send tags, especially in the presence of vlan and lagg wrapper tags, add a reference count to send tags managed via m_snd_tag_ref() and m_snd_tag_rele(). Provide a helper function (m_snd_tag_init()) for use by drivers supporting send tags. m_snd_tag_init() takes care of the if_ref on the ifp meaning that code alloating send tags via if_snd_tag_alloc no longer has to manage that manually. Similarly, m_snd_tag_rele drops the refcount on the ifp after invoking if_snd_tag_free when the last reference to a send tag is dropped. This also closes use after free races if there are pending packets in driver tx rings after the socket is closed (e.g. from tcpdrop). In order for m_free to work reliably, add a new CSUM_SND_TAG flag in csum_flags to indicate 'snd_tag' is set (rather than 'rcvif'). Drivers now also check this flag instead of checking snd_tag against NULL. This avoids false positive matches when a forwarded packet has a non-NULL rcvif that was treated as a send tag. - cxgbe was relying on snd_tag_free being called when the inp was detached so that it could kick the firmware to flush any pending work on the flow. This is because the driver doesn't require ACK messages from the firmware for every request, but instead does a kind of manual interrupt coalescing by only setting a flag to request a completion on a subset of requests. If all of the in-flight requests don't have the flag when the tag is detached from the inp, the flow might never return the credits. The current snd_tag_free command issues a flush command to force the credits to return. However, the credit return is what also frees the mbufs, and since those mbufs now hold references on the tag, this meant that snd_tag_free would never be called. To fix, explicitly drop the mbuf's reference on the snd tag when the mbuf is queued in the firmware work queue. This means that once the inp's reference on the tag goes away and all in-flight mbufs have been queued to the firmware, tag's refcount will drop to zero and snd_tag_free will kick in and send the flush request. Note that we need to avoid doing this in the middle of ethofld_tx(), so the driver grabs a temporary reference on the tag around that loop to defer the free to the end of the function in case it sends the last mbuf to the queue after the inp has dropped its reference on the tag. - mlx5 preallocates send tags and was using the ifp pointer even when the send tag wasn't in use. Explicitly use the ifp from other data structures instead. - Sprinkle some assertions in various places to assert that received packets don't have a send tag, and that other places that overwrite rcvif (e.g. 802.11 transmit) don't clobber a send tag pointer. Reviewed by: gallatin, hselasky, rgrimes, ae Sponsored by: Netflix Differential Revision: https://reviews.freebsd.org/D20117
2019-05-24 22:30:40 +00:00
#include <sys/socket.h>
Bring in mbuma to replace mballoc. mbuma is an Mbuf & Cluster allocator built on top of a number of extensions to the UMA framework, all included herein. Extensions to UMA worth noting: - Better layering between slab <-> zone caches; introduce Keg structure which splits off slab cache away from the zone structure and allows multiple zones to be stacked on top of a single Keg (single type of slab cache); perhaps we should look into defining a subset API on top of the Keg for special use by malloc(9), for example. - UMA_ZONE_REFCNT zones can now be added, and reference counters automagically allocated for them within the end of the associated slab structures. uma_find_refcnt() does a kextract to fetch the slab struct reference from the underlying page, and lookup the corresponding refcnt. mbuma things worth noting: - integrates mbuf & cluster allocations with extended UMA and provides caches for commonly-allocated items; defines several zones (two primary, one secondary) and two kegs. - change up certain code paths that always used to do: m_get() + m_clget() to instead just use m_getcl() and try to take advantage of the newly defined secondary Packet zone. - netstat(1) and systat(1) quickly hacked up to do basic stat reporting but additional stats work needs to be done once some other details within UMA have been taken care of and it becomes clearer to how stats will work within the modified framework. From the user perspective, one implication is that the NMBCLUSTERS compile-time option is no longer used. The maximum number of clusters is still capped off according to maxusers, but it can be made unlimited by setting the kern.ipc.nmbclusters boot-time tunable to zero. Work should be done to write an appropriate sysctl handler allowing dynamic tuning of kern.ipc.nmbclusters at runtime. Additional things worth noting/known issues (READ): - One report of 'ips' (ServeRAID) driver acting really slow in conjunction with mbuma. Need more data. Latest report is that ips is equally sucking with and without mbuma. - Giant leak in NFS code sometimes occurs, can't reproduce but currently analyzing; brueffer is able to reproduce but THIS IS NOT an mbuma-specific problem and currently occurs even WITHOUT mbuma. - Issues in network locking: there is at least one code path in the rip code where one or more locks are acquired and we end up in m_prepend() with M_WAITOK, which causes WITNESS to whine from within UMA. Current temporary solution: force all UMA allocations to be M_NOWAIT from within UMA for now to avoid deadlocks unless WITNESS is defined and we can determine with certainty that we're not holding any locks when we're M_WAITOK. - I've seen at least one weird socketbuffer empty-but- mbuf-still-attached panic. I don't believe this to be related to mbuma but please keep your eyes open, turn on debugging, and capture crash dumps. This change removes more code than it adds. A paper is available detailing the change and considering various performance issues, it was presented at BSDCan2004: http://www.unixdaemons.com/~bmilekic/netbuf_bmilekic.pdf Please read the paper for Future Work and implementation details, as well as credits. Testing and Debugging: rwatson, brueffer, Ketrien I. Saihr-Kesenchedra, ... Reviewed by: Lots of people (for different parts)
2004-05-31 21:46:06 +00:00
#include <sys/sysctl.h>
Restructure mbuf send tags to provide stronger guarantees. - Perform ifp mismatch checks (to determine if a send tag is allocated for a different ifp than the one the packet is being output on), in ip_output() and ip6_output(). This avoids sending packets with send tags to ifnet drivers that don't support send tags. Since we are now checking for ifp mismatches before invoking if_output, we can now try to allocate a new tag before invoking if_output sending the original packet on the new tag if allocation succeeds. To avoid code duplication for the fragment and unfragmented cases, add ip_output_send() and ip6_output_send() as wrappers around if_output and nd6_output_ifp, respectively. All of the logic for setting send tags and dealing with send tag-related errors is done in these wrapper functions. For pseudo interfaces that wrap other network interfaces (vlan and lagg), wrapper send tags are now allocated so that ip*_output see the wrapper ifp as the ifp in the send tag. The if_transmit routines rewrite the send tags after performing an ifp mismatch check. If an ifp mismatch is detected, the transmit routines fail with EAGAIN. - To provide clearer life cycle management of send tags, especially in the presence of vlan and lagg wrapper tags, add a reference count to send tags managed via m_snd_tag_ref() and m_snd_tag_rele(). Provide a helper function (m_snd_tag_init()) for use by drivers supporting send tags. m_snd_tag_init() takes care of the if_ref on the ifp meaning that code alloating send tags via if_snd_tag_alloc no longer has to manage that manually. Similarly, m_snd_tag_rele drops the refcount on the ifp after invoking if_snd_tag_free when the last reference to a send tag is dropped. This also closes use after free races if there are pending packets in driver tx rings after the socket is closed (e.g. from tcpdrop). In order for m_free to work reliably, add a new CSUM_SND_TAG flag in csum_flags to indicate 'snd_tag' is set (rather than 'rcvif'). Drivers now also check this flag instead of checking snd_tag against NULL. This avoids false positive matches when a forwarded packet has a non-NULL rcvif that was treated as a send tag. - cxgbe was relying on snd_tag_free being called when the inp was detached so that it could kick the firmware to flush any pending work on the flow. This is because the driver doesn't require ACK messages from the firmware for every request, but instead does a kind of manual interrupt coalescing by only setting a flag to request a completion on a subset of requests. If all of the in-flight requests don't have the flag when the tag is detached from the inp, the flow might never return the credits. The current snd_tag_free command issues a flush command to force the credits to return. However, the credit return is what also frees the mbufs, and since those mbufs now hold references on the tag, this meant that snd_tag_free would never be called. To fix, explicitly drop the mbuf's reference on the snd tag when the mbuf is queued in the firmware work queue. This means that once the inp's reference on the tag goes away and all in-flight mbufs have been queued to the firmware, tag's refcount will drop to zero and snd_tag_free will kick in and send the flush request. Note that we need to avoid doing this in the middle of ethofld_tx(), so the driver grabs a temporary reference on the tag around that loop to defer the free to the end of the function in case it sends the last mbuf to the queue after the inp has dropped its reference on the tag. - mlx5 preallocates send tags and was using the ifp pointer even when the send tag wasn't in use. Explicitly use the ifp from other data structures instead. - Sprinkle some assertions in various places to assert that received packets don't have a send tag, and that other places that overwrite rcvif (e.g. 802.11 transmit) don't clobber a send tag pointer. Reviewed by: gallatin, hselasky, rgrimes, ae Sponsored by: Netflix Differential Revision: https://reviews.freebsd.org/D20117
2019-05-24 22:30:40 +00:00
#include <net/if.h>
#include <net/if_var.h>
Bring in mbuma to replace mballoc. mbuma is an Mbuf & Cluster allocator built on top of a number of extensions to the UMA framework, all included herein. Extensions to UMA worth noting: - Better layering between slab <-> zone caches; introduce Keg structure which splits off slab cache away from the zone structure and allows multiple zones to be stacked on top of a single Keg (single type of slab cache); perhaps we should look into defining a subset API on top of the Keg for special use by malloc(9), for example. - UMA_ZONE_REFCNT zones can now be added, and reference counters automagically allocated for them within the end of the associated slab structures. uma_find_refcnt() does a kextract to fetch the slab struct reference from the underlying page, and lookup the corresponding refcnt. mbuma things worth noting: - integrates mbuf & cluster allocations with extended UMA and provides caches for commonly-allocated items; defines several zones (two primary, one secondary) and two kegs. - change up certain code paths that always used to do: m_get() + m_clget() to instead just use m_getcl() and try to take advantage of the newly defined secondary Packet zone. - netstat(1) and systat(1) quickly hacked up to do basic stat reporting but additional stats work needs to be done once some other details within UMA have been taken care of and it becomes clearer to how stats will work within the modified framework. From the user perspective, one implication is that the NMBCLUSTERS compile-time option is no longer used. The maximum number of clusters is still capped off according to maxusers, but it can be made unlimited by setting the kern.ipc.nmbclusters boot-time tunable to zero. Work should be done to write an appropriate sysctl handler allowing dynamic tuning of kern.ipc.nmbclusters at runtime. Additional things worth noting/known issues (READ): - One report of 'ips' (ServeRAID) driver acting really slow in conjunction with mbuma. Need more data. Latest report is that ips is equally sucking with and without mbuma. - Giant leak in NFS code sometimes occurs, can't reproduce but currently analyzing; brueffer is able to reproduce but THIS IS NOT an mbuma-specific problem and currently occurs even WITHOUT mbuma. - Issues in network locking: there is at least one code path in the rip code where one or more locks are acquired and we end up in m_prepend() with M_WAITOK, which causes WITNESS to whine from within UMA. Current temporary solution: force all UMA allocations to be M_NOWAIT from within UMA for now to avoid deadlocks unless WITNESS is defined and we can determine with certainty that we're not holding any locks when we're M_WAITOK. - I've seen at least one weird socketbuffer empty-but- mbuf-still-attached panic. I don't believe this to be related to mbuma but please keep your eyes open, turn on debugging, and capture crash dumps. This change removes more code than it adds. A paper is available detailing the change and considering various performance issues, it was presented at BSDCan2004: http://www.unixdaemons.com/~bmilekic/netbuf_bmilekic.pdf Please read the paper for Future Work and implementation details, as well as credits. Testing and Debugging: rwatson, brueffer, Ketrien I. Saihr-Kesenchedra, ... Reviewed by: Lots of people (for different parts)
2004-05-31 21:46:06 +00:00
#include <vm/vm.h>
Utilize the new function kmem_alloc_contig() to implement the UMA back-end allocator for the jumbo frames zones. This change has two benefits: (1) a custom back-end deallocator is no longer required. UMA's standard deallocator suffices. (2) It eliminates a potentially confusing artifact of using contigmalloc(): The malloc(9) statistics contain bogus information about the usage of jumbo frames. Specifically, the malloc(9) statistics report all jumbo frames in use whereas the UMA zone statistics report the "truth" about the number in use vs. the number free.
2009-06-18 17:59:04 +00:00
#include <vm/vm_extern.h>
#include <vm/vm_kern.h>
Bring in mbuma to replace mballoc. mbuma is an Mbuf & Cluster allocator built on top of a number of extensions to the UMA framework, all included herein. Extensions to UMA worth noting: - Better layering between slab <-> zone caches; introduce Keg structure which splits off slab cache away from the zone structure and allows multiple zones to be stacked on top of a single Keg (single type of slab cache); perhaps we should look into defining a subset API on top of the Keg for special use by malloc(9), for example. - UMA_ZONE_REFCNT zones can now be added, and reference counters automagically allocated for them within the end of the associated slab structures. uma_find_refcnt() does a kextract to fetch the slab struct reference from the underlying page, and lookup the corresponding refcnt. mbuma things worth noting: - integrates mbuf & cluster allocations with extended UMA and provides caches for commonly-allocated items; defines several zones (two primary, one secondary) and two kegs. - change up certain code paths that always used to do: m_get() + m_clget() to instead just use m_getcl() and try to take advantage of the newly defined secondary Packet zone. - netstat(1) and systat(1) quickly hacked up to do basic stat reporting but additional stats work needs to be done once some other details within UMA have been taken care of and it becomes clearer to how stats will work within the modified framework. From the user perspective, one implication is that the NMBCLUSTERS compile-time option is no longer used. The maximum number of clusters is still capped off according to maxusers, but it can be made unlimited by setting the kern.ipc.nmbclusters boot-time tunable to zero. Work should be done to write an appropriate sysctl handler allowing dynamic tuning of kern.ipc.nmbclusters at runtime. Additional things worth noting/known issues (READ): - One report of 'ips' (ServeRAID) driver acting really slow in conjunction with mbuma. Need more data. Latest report is that ips is equally sucking with and without mbuma. - Giant leak in NFS code sometimes occurs, can't reproduce but currently analyzing; brueffer is able to reproduce but THIS IS NOT an mbuma-specific problem and currently occurs even WITHOUT mbuma. - Issues in network locking: there is at least one code path in the rip code where one or more locks are acquired and we end up in m_prepend() with M_WAITOK, which causes WITNESS to whine from within UMA. Current temporary solution: force all UMA allocations to be M_NOWAIT from within UMA for now to avoid deadlocks unless WITNESS is defined and we can determine with certainty that we're not holding any locks when we're M_WAITOK. - I've seen at least one weird socketbuffer empty-but- mbuf-still-attached panic. I don't believe this to be related to mbuma but please keep your eyes open, turn on debugging, and capture crash dumps. This change removes more code than it adds. A paper is available detailing the change and considering various performance issues, it was presented at BSDCan2004: http://www.unixdaemons.com/~bmilekic/netbuf_bmilekic.pdf Please read the paper for Future Work and implementation details, as well as credits. Testing and Debugging: rwatson, brueffer, Ketrien I. Saihr-Kesenchedra, ... Reviewed by: Lots of people (for different parts)
2004-05-31 21:46:06 +00:00
#include <vm/vm_page.h>
Add two functions that create M_EXTPG mbufs with anonymous pages. These two functions are needed by nfs-over-tls, but could also be useful for other purposes. mb_alloc_ext_plus_pages() - Allocates a M_EXTPG mbuf and enough anonymous pages to store "len" data bytes. mb_mapped_to_unmapped() - Copies the data from a list of mapped (non-M_EXTPG) mbufs into a list of M_EXTPG mbufs allocated with anonymous pages. This is roughly the inverse of mb_unmapped_to_ext(). Reviewed by: gallatin Differential Revision: https://reviews.freebsd.org/D25182
2020-06-10 02:51:39 +00:00
#include <vm/vm_pageout.h>
Move the mbuf memory limit calculations from init_param2() to tunable_mbinit() where it is next to where it is used later. Change the sysinit level of tunable_mbinit() from SI_SUB_TUNABLES to SI_SUB_KMEM after the VM is running. This allows to use better methods to determine the effectively available physical and virtual memory available to the kernel. Update comments. In a second step it can be merged into mbuf_init().
2013-01-17 21:28:31 +00:00
#include <vm/vm_map.h>
Bring in mbuma to replace mballoc. mbuma is an Mbuf & Cluster allocator built on top of a number of extensions to the UMA framework, all included herein. Extensions to UMA worth noting: - Better layering between slab <-> zone caches; introduce Keg structure which splits off slab cache away from the zone structure and allows multiple zones to be stacked on top of a single Keg (single type of slab cache); perhaps we should look into defining a subset API on top of the Keg for special use by malloc(9), for example. - UMA_ZONE_REFCNT zones can now be added, and reference counters automagically allocated for them within the end of the associated slab structures. uma_find_refcnt() does a kextract to fetch the slab struct reference from the underlying page, and lookup the corresponding refcnt. mbuma things worth noting: - integrates mbuf & cluster allocations with extended UMA and provides caches for commonly-allocated items; defines several zones (two primary, one secondary) and two kegs. - change up certain code paths that always used to do: m_get() + m_clget() to instead just use m_getcl() and try to take advantage of the newly defined secondary Packet zone. - netstat(1) and systat(1) quickly hacked up to do basic stat reporting but additional stats work needs to be done once some other details within UMA have been taken care of and it becomes clearer to how stats will work within the modified framework. From the user perspective, one implication is that the NMBCLUSTERS compile-time option is no longer used. The maximum number of clusters is still capped off according to maxusers, but it can be made unlimited by setting the kern.ipc.nmbclusters boot-time tunable to zero. Work should be done to write an appropriate sysctl handler allowing dynamic tuning of kern.ipc.nmbclusters at runtime. Additional things worth noting/known issues (READ): - One report of 'ips' (ServeRAID) driver acting really slow in conjunction with mbuma. Need more data. Latest report is that ips is equally sucking with and without mbuma. - Giant leak in NFS code sometimes occurs, can't reproduce but currently analyzing; brueffer is able to reproduce but THIS IS NOT an mbuma-specific problem and currently occurs even WITHOUT mbuma. - Issues in network locking: there is at least one code path in the rip code where one or more locks are acquired and we end up in m_prepend() with M_WAITOK, which causes WITNESS to whine from within UMA. Current temporary solution: force all UMA allocations to be M_NOWAIT from within UMA for now to avoid deadlocks unless WITNESS is defined and we can determine with certainty that we're not holding any locks when we're M_WAITOK. - I've seen at least one weird socketbuffer empty-but- mbuf-still-attached panic. I don't believe this to be related to mbuma but please keep your eyes open, turn on debugging, and capture crash dumps. This change removes more code than it adds. A paper is available detailing the change and considering various performance issues, it was presented at BSDCan2004: http://www.unixdaemons.com/~bmilekic/netbuf_bmilekic.pdf Please read the paper for Future Work and implementation details, as well as credits. Testing and Debugging: rwatson, brueffer, Ketrien I. Saihr-Kesenchedra, ... Reviewed by: Lots of people (for different parts)
2004-05-31 21:46:06 +00:00
#include <vm/uma.h>
Change the mbuf, mbuf cluster, and mbuf packet allocation routines so that the UMA "trash" allocator is used - this ensures that any writes to a freed mbuf should provoke a panic. Only enabled under INVARIANTS, of course. Approved by: re (scottl)
2005-06-23 04:33:39 +00:00
#include <vm/uma_dbg.h>
Bring in mbuma to replace mballoc. mbuma is an Mbuf & Cluster allocator built on top of a number of extensions to the UMA framework, all included herein. Extensions to UMA worth noting: - Better layering between slab <-> zone caches; introduce Keg structure which splits off slab cache away from the zone structure and allows multiple zones to be stacked on top of a single Keg (single type of slab cache); perhaps we should look into defining a subset API on top of the Keg for special use by malloc(9), for example. - UMA_ZONE_REFCNT zones can now be added, and reference counters automagically allocated for them within the end of the associated slab structures. uma_find_refcnt() does a kextract to fetch the slab struct reference from the underlying page, and lookup the corresponding refcnt. mbuma things worth noting: - integrates mbuf & cluster allocations with extended UMA and provides caches for commonly-allocated items; defines several zones (two primary, one secondary) and two kegs. - change up certain code paths that always used to do: m_get() + m_clget() to instead just use m_getcl() and try to take advantage of the newly defined secondary Packet zone. - netstat(1) and systat(1) quickly hacked up to do basic stat reporting but additional stats work needs to be done once some other details within UMA have been taken care of and it becomes clearer to how stats will work within the modified framework. From the user perspective, one implication is that the NMBCLUSTERS compile-time option is no longer used. The maximum number of clusters is still capped off according to maxusers, but it can be made unlimited by setting the kern.ipc.nmbclusters boot-time tunable to zero. Work should be done to write an appropriate sysctl handler allowing dynamic tuning of kern.ipc.nmbclusters at runtime. Additional things worth noting/known issues (READ): - One report of 'ips' (ServeRAID) driver acting really slow in conjunction with mbuma. Need more data. Latest report is that ips is equally sucking with and without mbuma. - Giant leak in NFS code sometimes occurs, can't reproduce but currently analyzing; brueffer is able to reproduce but THIS IS NOT an mbuma-specific problem and currently occurs even WITHOUT mbuma. - Issues in network locking: there is at least one code path in the rip code where one or more locks are acquired and we end up in m_prepend() with M_WAITOK, which causes WITNESS to whine from within UMA. Current temporary solution: force all UMA allocations to be M_NOWAIT from within UMA for now to avoid deadlocks unless WITNESS is defined and we can determine with certainty that we're not holding any locks when we're M_WAITOK. - I've seen at least one weird socketbuffer empty-but- mbuf-still-attached panic. I don't believe this to be related to mbuma but please keep your eyes open, turn on debugging, and capture crash dumps. This change removes more code than it adds. A paper is available detailing the change and considering various performance issues, it was presented at BSDCan2004: http://www.unixdaemons.com/~bmilekic/netbuf_bmilekic.pdf Please read the paper for Future Work and implementation details, as well as credits. Testing and Debugging: rwatson, brueffer, Ketrien I. Saihr-Kesenchedra, ... Reviewed by: Lots of people (for different parts)
2004-05-31 21:46:06 +00:00
/*
* In FreeBSD, Mbufs and Mbuf Clusters are allocated from UMA
* Zones.
*
* Mbuf Clusters (2K, contiguous) are allocated from the Cluster
* Zone. The Zone can be capped at kern.ipc.nmbclusters, if the
* administrator so desires.
*
Use zone nomenclature that is consistent with UMA.
2020-06-21 04:59:02 +00:00
* Mbufs are allocated from a UMA Primary Zone called the Mbuf
Bring in mbuma to replace mballoc. mbuma is an Mbuf & Cluster allocator built on top of a number of extensions to the UMA framework, all included herein. Extensions to UMA worth noting: - Better layering between slab <-> zone caches; introduce Keg structure which splits off slab cache away from the zone structure and allows multiple zones to be stacked on top of a single Keg (single type of slab cache); perhaps we should look into defining a subset API on top of the Keg for special use by malloc(9), for example. - UMA_ZONE_REFCNT zones can now be added, and reference counters automagically allocated for them within the end of the associated slab structures. uma_find_refcnt() does a kextract to fetch the slab struct reference from the underlying page, and lookup the corresponding refcnt. mbuma things worth noting: - integrates mbuf & cluster allocations with extended UMA and provides caches for commonly-allocated items; defines several zones (two primary, one secondary) and two kegs. - change up certain code paths that always used to do: m_get() + m_clget() to instead just use m_getcl() and try to take advantage of the newly defined secondary Packet zone. - netstat(1) and systat(1) quickly hacked up to do basic stat reporting but additional stats work needs to be done once some other details within UMA have been taken care of and it becomes clearer to how stats will work within the modified framework. From the user perspective, one implication is that the NMBCLUSTERS compile-time option is no longer used. The maximum number of clusters is still capped off according to maxusers, but it can be made unlimited by setting the kern.ipc.nmbclusters boot-time tunable to zero. Work should be done to write an appropriate sysctl handler allowing dynamic tuning of kern.ipc.nmbclusters at runtime. Additional things worth noting/known issues (READ): - One report of 'ips' (ServeRAID) driver acting really slow in conjunction with mbuma. Need more data. Latest report is that ips is equally sucking with and without mbuma. - Giant leak in NFS code sometimes occurs, can't reproduce but currently analyzing; brueffer is able to reproduce but THIS IS NOT an mbuma-specific problem and currently occurs even WITHOUT mbuma. - Issues in network locking: there is at least one code path in the rip code where one or more locks are acquired and we end up in m_prepend() with M_WAITOK, which causes WITNESS to whine from within UMA. Current temporary solution: force all UMA allocations to be M_NOWAIT from within UMA for now to avoid deadlocks unless WITNESS is defined and we can determine with certainty that we're not holding any locks when we're M_WAITOK. - I've seen at least one weird socketbuffer empty-but- mbuf-still-attached panic. I don't believe this to be related to mbuma but please keep your eyes open, turn on debugging, and capture crash dumps. This change removes more code than it adds. A paper is available detailing the change and considering various performance issues, it was presented at BSDCan2004: http://www.unixdaemons.com/~bmilekic/netbuf_bmilekic.pdf Please read the paper for Future Work and implementation details, as well as credits. Testing and Debugging: rwatson, brueffer, Ketrien I. Saihr-Kesenchedra, ... Reviewed by: Lots of people (for different parts)
2004-05-31 21:46:06 +00:00
* Zone.
*
* Additionally, FreeBSD provides a Packet Zone, which it
Use zone nomenclature that is consistent with UMA.
2020-06-21 04:59:02 +00:00
* configures as a Secondary Zone to the Mbuf Primary Zone,
* thus sharing backend Slab kegs with the Mbuf Primary Zone.
Bring in mbuma to replace mballoc. mbuma is an Mbuf & Cluster allocator built on top of a number of extensions to the UMA framework, all included herein. Extensions to UMA worth noting: - Better layering between slab <-> zone caches; introduce Keg structure which splits off slab cache away from the zone structure and allows multiple zones to be stacked on top of a single Keg (single type of slab cache); perhaps we should look into defining a subset API on top of the Keg for special use by malloc(9), for example. - UMA_ZONE_REFCNT zones can now be added, and reference counters automagically allocated for them within the end of the associated slab structures. uma_find_refcnt() does a kextract to fetch the slab struct reference from the underlying page, and lookup the corresponding refcnt. mbuma things worth noting: - integrates mbuf & cluster allocations with extended UMA and provides caches for commonly-allocated items; defines several zones (two primary, one secondary) and two kegs. - change up certain code paths that always used to do: m_get() + m_clget() to instead just use m_getcl() and try to take advantage of the newly defined secondary Packet zone. - netstat(1) and systat(1) quickly hacked up to do basic stat reporting but additional stats work needs to be done once some other details within UMA have been taken care of and it becomes clearer to how stats will work within the modified framework. From the user perspective, one implication is that the NMBCLUSTERS compile-time option is no longer used. The maximum number of clusters is still capped off according to maxusers, but it can be made unlimited by setting the kern.ipc.nmbclusters boot-time tunable to zero. Work should be done to write an appropriate sysctl handler allowing dynamic tuning of kern.ipc.nmbclusters at runtime. Additional things worth noting/known issues (READ): - One report of 'ips' (ServeRAID) driver acting really slow in conjunction with mbuma. Need more data. Latest report is that ips is equally sucking with and without mbuma. - Giant leak in NFS code sometimes occurs, can't reproduce but currently analyzing; brueffer is able to reproduce but THIS IS NOT an mbuma-specific problem and currently occurs even WITHOUT mbuma. - Issues in network locking: there is at least one code path in the rip code where one or more locks are acquired and we end up in m_prepend() with M_WAITOK, which causes WITNESS to whine from within UMA. Current temporary solution: force all UMA allocations to be M_NOWAIT from within UMA for now to avoid deadlocks unless WITNESS is defined and we can determine with certainty that we're not holding any locks when we're M_WAITOK. - I've seen at least one weird socketbuffer empty-but- mbuf-still-attached panic. I don't believe this to be related to mbuma but please keep your eyes open, turn on debugging, and capture crash dumps. This change removes more code than it adds. A paper is available detailing the change and considering various performance issues, it was presented at BSDCan2004: http://www.unixdaemons.com/~bmilekic/netbuf_bmilekic.pdf Please read the paper for Future Work and implementation details, as well as credits. Testing and Debugging: rwatson, brueffer, Ketrien I. Saihr-Kesenchedra, ... Reviewed by: Lots of people (for different parts)
2004-05-31 21:46:06 +00:00
*
* Thus common-case allocations and locking are simplified:
*
* m_clget() m_getcl()
* | |
* | .------------>[(Packet Cache)] m_get(), m_gethdr()
* | | [ Packet ] |
* [(Cluster Cache)] [ Secondary ] [ (Mbuf Cache) ]
Use zone nomenclature that is consistent with UMA.
2020-06-21 04:59:02 +00:00
* [ Cluster Zone ] [ Zone ] [ Mbuf Primary Zone ]
Bring in mbuma to replace mballoc. mbuma is an Mbuf & Cluster allocator built on top of a number of extensions to the UMA framework, all included herein. Extensions to UMA worth noting: - Better layering between slab <-> zone caches; introduce Keg structure which splits off slab cache away from the zone structure and allows multiple zones to be stacked on top of a single Keg (single type of slab cache); perhaps we should look into defining a subset API on top of the Keg for special use by malloc(9), for example. - UMA_ZONE_REFCNT zones can now be added, and reference counters automagically allocated for them within the end of the associated slab structures. uma_find_refcnt() does a kextract to fetch the slab struct reference from the underlying page, and lookup the corresponding refcnt. mbuma things worth noting: - integrates mbuf & cluster allocations with extended UMA and provides caches for commonly-allocated items; defines several zones (two primary, one secondary) and two kegs. - change up certain code paths that always used to do: m_get() + m_clget() to instead just use m_getcl() and try to take advantage of the newly defined secondary Packet zone. - netstat(1) and systat(1) quickly hacked up to do basic stat reporting but additional stats work needs to be done once some other details within UMA have been taken care of and it becomes clearer to how stats will work within the modified framework. From the user perspective, one implication is that the NMBCLUSTERS compile-time option is no longer used. The maximum number of clusters is still capped off according to maxusers, but it can be made unlimited by setting the kern.ipc.nmbclusters boot-time tunable to zero. Work should be done to write an appropriate sysctl handler allowing dynamic tuning of kern.ipc.nmbclusters at runtime. Additional things worth noting/known issues (READ): - One report of 'ips' (ServeRAID) driver acting really slow in conjunction with mbuma. Need more data. Latest report is that ips is equally sucking with and without mbuma. - Giant leak in NFS code sometimes occurs, can't reproduce but currently analyzing; brueffer is able to reproduce but THIS IS NOT an mbuma-specific problem and currently occurs even WITHOUT mbuma. - Issues in network locking: there is at least one code path in the rip code where one or more locks are acquired and we end up in m_prepend() with M_WAITOK, which causes WITNESS to whine from within UMA. Current temporary solution: force all UMA allocations to be M_NOWAIT from within UMA for now to avoid deadlocks unless WITNESS is defined and we can determine with certainty that we're not holding any locks when we're M_WAITOK. - I've seen at least one weird socketbuffer empty-but- mbuf-still-attached panic. I don't believe this to be related to mbuma but please keep your eyes open, turn on debugging, and capture crash dumps. This change removes more code than it adds. A paper is available detailing the change and considering various performance issues, it was presented at BSDCan2004: http://www.unixdaemons.com/~bmilekic/netbuf_bmilekic.pdf Please read the paper for Future Work and implementation details, as well as credits. Testing and Debugging: rwatson, brueffer, Ketrien I. Saihr-Kesenchedra, ... Reviewed by: Lots of people (for different parts)
2004-05-31 21:46:06 +00:00
* | \________ |
* [ Cluster Keg ] \ /
Style cleanups.
2012-12-07 22:19:41 +00:00
* | [ Mbuf Keg ]
Bring in mbuma to replace mballoc. mbuma is an Mbuf & Cluster allocator built on top of a number of extensions to the UMA framework, all included herein. Extensions to UMA worth noting: - Better layering between slab <-> zone caches; introduce Keg structure which splits off slab cache away from the zone structure and allows multiple zones to be stacked on top of a single Keg (single type of slab cache); perhaps we should look into defining a subset API on top of the Keg for special use by malloc(9), for example. - UMA_ZONE_REFCNT zones can now be added, and reference counters automagically allocated for them within the end of the associated slab structures. uma_find_refcnt() does a kextract to fetch the slab struct reference from the underlying page, and lookup the corresponding refcnt. mbuma things worth noting: - integrates mbuf & cluster allocations with extended UMA and provides caches for commonly-allocated items; defines several zones (two primary, one secondary) and two kegs. - change up certain code paths that always used to do: m_get() + m_clget() to instead just use m_getcl() and try to take advantage of the newly defined secondary Packet zone. - netstat(1) and systat(1) quickly hacked up to do basic stat reporting but additional stats work needs to be done once some other details within UMA have been taken care of and it becomes clearer to how stats will work within the modified framework. From the user perspective, one implication is that the NMBCLUSTERS compile-time option is no longer used. The maximum number of clusters is still capped off according to maxusers, but it can be made unlimited by setting the kern.ipc.nmbclusters boot-time tunable to zero. Work should be done to write an appropriate sysctl handler allowing dynamic tuning of kern.ipc.nmbclusters at runtime. Additional things worth noting/known issues (READ): - One report of 'ips' (ServeRAID) driver acting really slow in conjunction with mbuma. Need more data. Latest report is that ips is equally sucking with and without mbuma. - Giant leak in NFS code sometimes occurs, can't reproduce but currently analyzing; brueffer is able to reproduce but THIS IS NOT an mbuma-specific problem and currently occurs even WITHOUT mbuma. - Issues in network locking: there is at least one code path in the rip code where one or more locks are acquired and we end up in m_prepend() with M_WAITOK, which causes WITNESS to whine from within UMA. Current temporary solution: force all UMA allocations to be M_NOWAIT from within UMA for now to avoid deadlocks unless WITNESS is defined and we can determine with certainty that we're not holding any locks when we're M_WAITOK. - I've seen at least one weird socketbuffer empty-but- mbuf-still-attached panic. I don't believe this to be related to mbuma but please keep your eyes open, turn on debugging, and capture crash dumps. This change removes more code than it adds. A paper is available detailing the change and considering various performance issues, it was presented at BSDCan2004: http://www.unixdaemons.com/~bmilekic/netbuf_bmilekic.pdf Please read the paper for Future Work and implementation details, as well as credits. Testing and Debugging: rwatson, brueffer, Ketrien I. Saihr-Kesenchedra, ... Reviewed by: Lots of people (for different parts)
2004-05-31 21:46:06 +00:00
* [ Cluster Slabs ] |
* | [ Mbuf Slabs ]
* \____________(VM)_________________/
Mandatory mbuf cluster reference counting and groundwork for UMA based jumbo 9k and jumbo 16k cluster support. All mbuf's with external storage attached are mandatory reference counted. For clusters and jumbo clusters UMA provides the refcnt storage directly. It does not have to be separatly allocated. Any other type of external storage gets its own refcnt allocated from an UMA mbuf refcnt zone instead of normal kernel malloc. The refcount API MEXT_ADD_REF() and MEXT_REM_REF() is no longer publically accessible. The proper m_* functions have to be used. mb_ctor_clust() and mb_dtor_clust() both handle normal 2K as well as 9k and 16k clusters. Clusters and jumbo clusters may be obtained without attaching it immideatly to an mbuf. This is for high performance cluster allocation in network drivers where mbufs are attached after the cluster has been filled. Tested by: rwatson Sponsored by: TCP/IP Optimizations Fundraise 2005
2005-11-02 16:20:36 +00:00
*
*
Fix several typos and trim spaces at eol. PR: kern/93759 Submitted by: Antoine Brodin <antoine.brodin laposte.net>
2006-02-26 11:44:28 +00:00
* Whenever an object is allocated with uma_zalloc() out of
Mandatory mbuf cluster reference counting and groundwork for UMA based jumbo 9k and jumbo 16k cluster support. All mbuf's with external storage attached are mandatory reference counted. For clusters and jumbo clusters UMA provides the refcnt storage directly. It does not have to be separatly allocated. Any other type of external storage gets its own refcnt allocated from an UMA mbuf refcnt zone instead of normal kernel malloc. The refcount API MEXT_ADD_REF() and MEXT_REM_REF() is no longer publically accessible. The proper m_* functions have to be used. mb_ctor_clust() and mb_dtor_clust() both handle normal 2K as well as 9k and 16k clusters. Clusters and jumbo clusters may be obtained without attaching it immideatly to an mbuf. This is for high performance cluster allocation in network drivers where mbufs are attached after the cluster has been filled. Tested by: rwatson Sponsored by: TCP/IP Optimizations Fundraise 2005
2005-11-02 16:20:36 +00:00
* one of the Zones its _ctor_ function is executed. The same
Fix several typos and trim spaces at eol. PR: kern/93759 Submitted by: Antoine Brodin <antoine.brodin laposte.net>
2006-02-26 11:44:28 +00:00
* for any deallocation through uma_zfree() the _dtor_ function
Mandatory mbuf cluster reference counting and groundwork for UMA based jumbo 9k and jumbo 16k cluster support. All mbuf's with external storage attached are mandatory reference counted. For clusters and jumbo clusters UMA provides the refcnt storage directly. It does not have to be separatly allocated. Any other type of external storage gets its own refcnt allocated from an UMA mbuf refcnt zone instead of normal kernel malloc. The refcount API MEXT_ADD_REF() and MEXT_REM_REF() is no longer publically accessible. The proper m_* functions have to be used. mb_ctor_clust() and mb_dtor_clust() both handle normal 2K as well as 9k and 16k clusters. Clusters and jumbo clusters may be obtained without attaching it immideatly to an mbuf. This is for high performance cluster allocation in network drivers where mbufs are attached after the cluster has been filled. Tested by: rwatson Sponsored by: TCP/IP Optimizations Fundraise 2005
2005-11-02 16:20:36 +00:00
* is executed.
Fix several typos and trim spaces at eol. PR: kern/93759 Submitted by: Antoine Brodin <antoine.brodin laposte.net>
2006-02-26 11:44:28 +00:00
*
Use zone nomenclature that is consistent with UMA.
2020-06-21 04:59:02 +00:00
* Caches are per-CPU and are filled from the Primary Zone.
Mandatory mbuf cluster reference counting and groundwork for UMA based jumbo 9k and jumbo 16k cluster support. All mbuf's with external storage attached are mandatory reference counted. For clusters and jumbo clusters UMA provides the refcnt storage directly. It does not have to be separatly allocated. Any other type of external storage gets its own refcnt allocated from an UMA mbuf refcnt zone instead of normal kernel malloc. The refcount API MEXT_ADD_REF() and MEXT_REM_REF() is no longer publically accessible. The proper m_* functions have to be used. mb_ctor_clust() and mb_dtor_clust() both handle normal 2K as well as 9k and 16k clusters. Clusters and jumbo clusters may be obtained without attaching it immideatly to an mbuf. This is for high performance cluster allocation in network drivers where mbufs are attached after the cluster has been filled. Tested by: rwatson Sponsored by: TCP/IP Optimizations Fundraise 2005
2005-11-02 16:20:36 +00:00
*
Fix several typos and trim spaces at eol. PR: kern/93759 Submitted by: Antoine Brodin <antoine.brodin laposte.net>
2006-02-26 11:44:28 +00:00
* Whenever an object is allocated from the underlying global
Mandatory mbuf cluster reference counting and groundwork for UMA based jumbo 9k and jumbo 16k cluster support. All mbuf's with external storage attached are mandatory reference counted. For clusters and jumbo clusters UMA provides the refcnt storage directly. It does not have to be separatly allocated. Any other type of external storage gets its own refcnt allocated from an UMA mbuf refcnt zone instead of normal kernel malloc. The refcount API MEXT_ADD_REF() and MEXT_REM_REF() is no longer publically accessible. The proper m_* functions have to be used. mb_ctor_clust() and mb_dtor_clust() both handle normal 2K as well as 9k and 16k clusters. Clusters and jumbo clusters may be obtained without attaching it immideatly to an mbuf. This is for high performance cluster allocation in network drivers where mbufs are attached after the cluster has been filled. Tested by: rwatson Sponsored by: TCP/IP Optimizations Fundraise 2005
2005-11-02 16:20:36 +00:00
* memory pool it gets pre-initialized with the _zinit_ functions.
sys/kern: spelling fixes in comments. No functional change.
2016-04-29 22:15:33 +00:00
* When the Keg's are overfull objects get decommissioned with
Mandatory mbuf cluster reference counting and groundwork for UMA based jumbo 9k and jumbo 16k cluster support. All mbuf's with external storage attached are mandatory reference counted. For clusters and jumbo clusters UMA provides the refcnt storage directly. It does not have to be separatly allocated. Any other type of external storage gets its own refcnt allocated from an UMA mbuf refcnt zone instead of normal kernel malloc. The refcount API MEXT_ADD_REF() and MEXT_REM_REF() is no longer publically accessible. The proper m_* functions have to be used. mb_ctor_clust() and mb_dtor_clust() both handle normal 2K as well as 9k and 16k clusters. Clusters and jumbo clusters may be obtained without attaching it immideatly to an mbuf. This is for high performance cluster allocation in network drivers where mbufs are attached after the cluster has been filled. Tested by: rwatson Sponsored by: TCP/IP Optimizations Fundraise 2005
2005-11-02 16:20:36 +00:00
* _zfini_ functions and free'd back to the global memory pool.
*
Bring in mbuma to replace mballoc. mbuma is an Mbuf & Cluster allocator built on top of a number of extensions to the UMA framework, all included herein. Extensions to UMA worth noting: - Better layering between slab <-> zone caches; introduce Keg structure which splits off slab cache away from the zone structure and allows multiple zones to be stacked on top of a single Keg (single type of slab cache); perhaps we should look into defining a subset API on top of the Keg for special use by malloc(9), for example. - UMA_ZONE_REFCNT zones can now be added, and reference counters automagically allocated for them within the end of the associated slab structures. uma_find_refcnt() does a kextract to fetch the slab struct reference from the underlying page, and lookup the corresponding refcnt. mbuma things worth noting: - integrates mbuf & cluster allocations with extended UMA and provides caches for commonly-allocated items; defines several zones (two primary, one secondary) and two kegs. - change up certain code paths that always used to do: m_get() + m_clget() to instead just use m_getcl() and try to take advantage of the newly defined secondary Packet zone. - netstat(1) and systat(1) quickly hacked up to do basic stat reporting but additional stats work needs to be done once some other details within UMA have been taken care of and it becomes clearer to how stats will work within the modified framework. From the user perspective, one implication is that the NMBCLUSTERS compile-time option is no longer used. The maximum number of clusters is still capped off according to maxusers, but it can be made unlimited by setting the kern.ipc.nmbclusters boot-time tunable to zero. Work should be done to write an appropriate sysctl handler allowing dynamic tuning of kern.ipc.nmbclusters at runtime. Additional things worth noting/known issues (READ): - One report of 'ips' (ServeRAID) driver acting really slow in conjunction with mbuma. Need more data. Latest report is that ips is equally sucking with and without mbuma. - Giant leak in NFS code sometimes occurs, can't reproduce but currently analyzing; brueffer is able to reproduce but THIS IS NOT an mbuma-specific problem and currently occurs even WITHOUT mbuma. - Issues in network locking: there is at least one code path in the rip code where one or more locks are acquired and we end up in m_prepend() with M_WAITOK, which causes WITNESS to whine from within UMA. Current temporary solution: force all UMA allocations to be M_NOWAIT from within UMA for now to avoid deadlocks unless WITNESS is defined and we can determine with certainty that we're not holding any locks when we're M_WAITOK. - I've seen at least one weird socketbuffer empty-but- mbuf-still-attached panic. I don't believe this to be related to mbuma but please keep your eyes open, turn on debugging, and capture crash dumps. This change removes more code than it adds. A paper is available detailing the change and considering various performance issues, it was presented at BSDCan2004: http://www.unixdaemons.com/~bmilekic/netbuf_bmilekic.pdf Please read the paper for Future Work and implementation details, as well as credits. Testing and Debugging: rwatson, brueffer, Ketrien I. Saihr-Kesenchedra, ... Reviewed by: Lots of people (for different parts)
2004-05-31 21:46:06 +00:00
*/
Base the mbuf related limits on the available physical memory or kernel memory, whichever is lower. The overall mbuf related memory limit must be set so that mbufs (and clusters of various sizes) can't exhaust physical RAM or KVM. The limit is set to half of the physical RAM or KVM (whichever is lower) as the baseline. In any normal scenario we want to leave at least half of the physmem/kvm for other kernel functions and userspace to prevent it from swapping too easily. Via a tunable kern.maxmbufmem the limit can be upped to at most 3/4 of physmem/kvm. At the same time divorce maxfiles from maxusers and set maxfiles to physpages / 8 with a floor based on maxusers. This way busy servers can make use of the significantly increased mbuf limits with a much larger number of open sockets. Tidy up ordering in init_param2() and check up on some users of those values calculated here. Out of the overall mbuf memory limit 2K clusters and 4K (page size) clusters to get 1/4 each because these are the most heavily used mbuf sizes. 2K clusters are used for MTU 1500 ethernet inbound packets. 4K clusters are used whenever possible for sends on sockets and thus outbound packets. The larger cluster sizes of 9K and 16K are limited to 1/6 of the overall mbuf memory limit. When jumbo MTU's are used these large clusters will end up only on the inbound path. They are not used on outbound, there it's still 4K. Yes, that will stay that way because otherwise we run into lots of complications in the stack. And it really isn't a problem, so don't make a scene. Normal mbufs (256B) weren't limited at all previously. This was problematic as there are certain places in the kernel that on allocation failure of clusters try to piece together their packet from smaller mbufs. The mbuf limit is the number of all other mbuf sizes together plus some more to allow for standalone mbufs (ACK for example) and to send off a copy of a cluster. Unfortunately there isn't a way to set an overall limit for all mbuf memory together as UMA doesn't support such a limiting. NB: Every cluster also has an mbuf associated with it. Two examples on the revised mbuf sizing limits: 1GB KVM: 512MB limit for mbufs 419,430 mbufs 65,536 2K mbuf clusters 32,768 4K mbuf clusters 9,709 9K mbuf clusters 5,461 16K mbuf clusters 16GB RAM: 8GB limit for mbufs 33,554,432 mbufs 1,048,576 2K mbuf clusters 524,288 4K mbuf clusters 155,344 9K mbuf clusters 87,381 16K mbuf clusters These defaults should be sufficient for even the most demanding network loads. MFC after: 1 month
2012-11-27 21:19:58 +00:00
int nmbufs; /* limits number of mbufs */
Mandatory mbuf cluster reference counting and groundwork for UMA based jumbo 9k and jumbo 16k cluster support. All mbuf's with external storage attached are mandatory reference counted. For clusters and jumbo clusters UMA provides the refcnt storage directly. It does not have to be separatly allocated. Any other type of external storage gets its own refcnt allocated from an UMA mbuf refcnt zone instead of normal kernel malloc. The refcount API MEXT_ADD_REF() and MEXT_REM_REF() is no longer publically accessible. The proper m_* functions have to be used. mb_ctor_clust() and mb_dtor_clust() both handle normal 2K as well as 9k and 16k clusters. Clusters and jumbo clusters may be obtained without attaching it immideatly to an mbuf. This is for high performance cluster allocation in network drivers where mbufs are attached after the cluster has been filled. Tested by: rwatson Sponsored by: TCP/IP Optimizations Fundraise 2005
2005-11-02 16:20:36 +00:00
int nmbclusters; /* limits number of mbuf clusters */
Replace the 4k fixed sized jumbo mbuf clusters with PAGE_SIZE sized jumbo mbuf clusters. To make the variable size clear they are named MJUMPAGESIZE. Having jumbo clusters with the native PAGE_SIZE is more useful than a fixed 4k size according the device driver writers using this API. The 9k and 16k jumbo mbuf clusters remain unchanged. Requested by: glebius, gallatin Sponsored by: TCP/IP Optimization Fundraise 2005 MFC after: 3 days
2006-02-17 14:14:15 +00:00
int nmbjumbop; /* limits number of page size jumbo clusters */
Mandatory mbuf cluster reference counting and groundwork for UMA based jumbo 9k and jumbo 16k cluster support. All mbuf's with external storage attached are mandatory reference counted. For clusters and jumbo clusters UMA provides the refcnt storage directly. It does not have to be separatly allocated. Any other type of external storage gets its own refcnt allocated from an UMA mbuf refcnt zone instead of normal kernel malloc. The refcount API MEXT_ADD_REF() and MEXT_REM_REF() is no longer publically accessible. The proper m_* functions have to be used. mb_ctor_clust() and mb_dtor_clust() both handle normal 2K as well as 9k and 16k clusters. Clusters and jumbo clusters may be obtained without attaching it immideatly to an mbuf. This is for high performance cluster allocation in network drivers where mbufs are attached after the cluster has been filled. Tested by: rwatson Sponsored by: TCP/IP Optimizations Fundraise 2005
2005-11-02 16:20:36 +00:00
int nmbjumbo9; /* limits number of 9k jumbo clusters */
int nmbjumbo16; /* limits number of 16k jumbo clusters */
Bring in mbuma to replace mballoc. mbuma is an Mbuf & Cluster allocator built on top of a number of extensions to the UMA framework, all included herein. Extensions to UMA worth noting: - Better layering between slab <-> zone caches; introduce Keg structure which splits off slab cache away from the zone structure and allows multiple zones to be stacked on top of a single Keg (single type of slab cache); perhaps we should look into defining a subset API on top of the Keg for special use by malloc(9), for example. - UMA_ZONE_REFCNT zones can now be added, and reference counters automagically allocated for them within the end of the associated slab structures. uma_find_refcnt() does a kextract to fetch the slab struct reference from the underlying page, and lookup the corresponding refcnt. mbuma things worth noting: - integrates mbuf & cluster allocations with extended UMA and provides caches for commonly-allocated items; defines several zones (two primary, one secondary) and two kegs. - change up certain code paths that always used to do: m_get() + m_clget() to instead just use m_getcl() and try to take advantage of the newly defined secondary Packet zone. - netstat(1) and systat(1) quickly hacked up to do basic stat reporting but additional stats work needs to be done once some other details within UMA have been taken care of and it becomes clearer to how stats will work within the modified framework. From the user perspective, one implication is that the NMBCLUSTERS compile-time option is no longer used. The maximum number of clusters is still capped off according to maxusers, but it can be made unlimited by setting the kern.ipc.nmbclusters boot-time tunable to zero. Work should be done to write an appropriate sysctl handler allowing dynamic tuning of kern.ipc.nmbclusters at runtime. Additional things worth noting/known issues (READ): - One report of 'ips' (ServeRAID) driver acting really slow in conjunction with mbuma. Need more data. Latest report is that ips is equally sucking with and without mbuma. - Giant leak in NFS code sometimes occurs, can't reproduce but currently analyzing; brueffer is able to reproduce but THIS IS NOT an mbuma-specific problem and currently occurs even WITHOUT mbuma. - Issues in network locking: there is at least one code path in the rip code where one or more locks are acquired and we end up in m_prepend() with M_WAITOK, which causes WITNESS to whine from within UMA. Current temporary solution: force all UMA allocations to be M_NOWAIT from within UMA for now to avoid deadlocks unless WITNESS is defined and we can determine with certainty that we're not holding any locks when we're M_WAITOK. - I've seen at least one weird socketbuffer empty-but- mbuf-still-attached panic. I don't believe this to be related to mbuma but please keep your eyes open, turn on debugging, and capture crash dumps. This change removes more code than it adds. A paper is available detailing the change and considering various performance issues, it was presented at BSDCan2004: http://www.unixdaemons.com/~bmilekic/netbuf_bmilekic.pdf Please read the paper for Future Work and implementation details, as well as credits. Testing and Debugging: rwatson, brueffer, Ketrien I. Saihr-Kesenchedra, ... Reviewed by: Lots of people (for different parts)
2004-05-31 21:46:06 +00:00
Step 4.2: start divorce of M_EXT and M_EXTPG They have more differencies than similarities. For now there is lots of code that would check for M_EXT only and work correctly on M_EXTPG buffers, so still carry M_EXT bit together with M_EXTPG. However, prepare some code for explicit check for M_EXTPG. Reviewed by: gallatin Differential Revision: https://reviews.freebsd.org/D24598
2020-05-03 00:37:16 +00:00
bool mb_use_ext_pgs; /* use M_EXTPG mbufs for sendfile & TLS */
Add support for using unmapped mbufs with sendfile(2). This can be enabled at runtime via the kern.ipc.mb_use_ext_pgs sysctl. It is disabled by default. Submitted by: gallatin (earlier version) Reviewed by: gallatin, hselasky, rrs Relnotes: yes Sponsored by: Netflix Differential Revision: https://reviews.freebsd.org/D20616
2019-06-29 00:49:35 +00:00
SYSCTL_BOOL(_kern_ipc, OID_AUTO, mb_use_ext_pgs, CTLFLAG_RWTUN,
&mb_use_ext_pgs, 0,
Add kernel-side support for in-kernel TLS. KTLS adds support for in-kernel framing and encryption of Transport Layer Security (1.0-1.2) data on TCP sockets. KTLS only supports offload of TLS for transmitted data. Key negotation must still be performed in userland. Once completed, transmit session keys for a connection are provided to the kernel via a new TCP_TXTLS_ENABLE socket option. All subsequent data transmitted on the socket is placed into TLS frames and encrypted using the supplied keys. Any data written to a KTLS-enabled socket via write(2), aio_write(2), or sendfile(2) is assumed to be application data and is encoded in TLS frames with an application data type. Individual records can be sent with a custom type (e.g. handshake messages) via sendmsg(2) with a new control message (TLS_SET_RECORD_TYPE) specifying the record type. At present, rekeying is not supported though the in-kernel framework should support rekeying. KTLS makes use of the recently added unmapped mbufs to store TLS frames in the socket buffer. Each TLS frame is described by a single ext_pgs mbuf. The ext_pgs structure contains the header of the TLS record (and trailer for encrypted records) as well as references to the associated TLS session. KTLS supports two primary methods of encrypting TLS frames: software TLS and ifnet TLS. Software TLS marks mbufs holding socket data as not ready via M_NOTREADY similar to sendfile(2) when TLS framing information is added to an unmapped mbuf in ktls_frame(). ktls_enqueue() is then called to schedule TLS frames for encryption. In the case of sendfile_iodone() calls ktls_enqueue() instead of pru_ready() leaving the mbufs marked M_NOTREADY until encryption is completed. For other writes (vn_sendfile when pages are available, write(2), etc.), the PRUS_NOTREADY is set when invoking pru_send() along with invoking ktls_enqueue(). A pool of worker threads (the "KTLS" kernel process) encrypts TLS frames queued via ktls_enqueue(). Each TLS frame is temporarily mapped using the direct map and passed to a software encryption backend to perform the actual encryption. (Note: The use of PHYS_TO_DMAP could be replaced with sf_bufs if someone wished to make this work on architectures without a direct map.) KTLS supports pluggable software encryption backends. Internally, Netflix uses proprietary pure-software backends. This commit includes a simple backend in a new ktls_ocf.ko module that uses the kernel's OpenCrypto framework to provide AES-GCM encryption of TLS frames. As a result, software TLS is now a bit of a misnomer as it can make use of hardware crypto accelerators. Once software encryption has finished, the TLS frame mbufs are marked ready via pru_ready(). At this point, the encrypted data appears as regular payload to the TCP stack stored in unmapped mbufs. ifnet TLS permits a NIC to offload the TLS encryption and TCP segmentation. In this mode, a new send tag type (IF_SND_TAG_TYPE_TLS) is allocated on the interface a socket is routed over and associated with a TLS session. TLS records for a TLS session using ifnet TLS are not marked M_NOTREADY but are passed down the stack unencrypted. The ip_output_send() and ip6_output_send() helper functions that apply send tags to outbound IP packets verify that the send tag of the TLS record matches the outbound interface. If so, the packet is tagged with the TLS send tag and sent to the interface. The NIC device driver must recognize packets with the TLS send tag and schedule them for TLS encryption and TCP segmentation. If the the outbound interface does not match the interface in the TLS send tag, the packet is dropped. In addition, a task is scheduled to refresh the TLS send tag for the TLS session. If a new TLS send tag cannot be allocated, the connection is dropped. If a new TLS send tag is allocated, however, subsequent packets will be tagged with the correct TLS send tag. (This latter case has been tested by configuring both ports of a Chelsio T6 in a lagg and failing over from one port to another. As the connections migrated to the new port, new TLS send tags were allocated for the new port and connections resumed without being dropped.) ifnet TLS can be enabled and disabled on supported network interfaces via new '[-]txtls[46]' options to ifconfig(8). ifnet TLS is supported across both vlan devices and lagg interfaces using failover, lacp with flowid enabled, or lacp with flowid enabled. Applications may request the current KTLS mode of a connection via a new TCP_TXTLS_MODE socket option. They can also use this socket option to toggle between software and ifnet TLS modes. In addition, a testing tool is available in tools/tools/switch_tls. This is modeled on tcpdrop and uses similar syntax. However, instead of dropping connections, -s is used to force KTLS connections to switch to software TLS and -i is used to switch to ifnet TLS. Various sysctls and counters are available under the kern.ipc.tls sysctl node. The kern.ipc.tls.enable node must be set to true to enable KTLS (it is off by default). The use of unmapped mbufs must also be enabled via kern.ipc.mb_use_ext_pgs to enable KTLS. KTLS is enabled via the KERN_TLS kernel option. This patch is the culmination of years of work by several folks including Scott Long and Randall Stewart for the original design and implementation; Drew Gallatin for several optimizations including the use of ext_pgs mbufs, the M_NOTREADY mechanism for TLS records awaiting software encryption, and pluggable software crypto backends; and John Baldwin for modifications to support hardware TLS offload. Reviewed by: gallatin, hselasky, rrs Obtained from: Netflix Sponsored by: Netflix, Chelsio Communications Differential Revision: https://reviews.freebsd.org/D21277
2019-08-27 00:01:56 +00:00
"Use unmapped mbufs for sendfile(2) and TLS offload");
Add support for using unmapped mbufs with sendfile(2). This can be enabled at runtime via the kern.ipc.mb_use_ext_pgs sysctl. It is disabled by default. Submitted by: gallatin (earlier version) Reviewed by: gallatin, hselasky, rrs Relnotes: yes Sponsored by: Netflix Differential Revision: https://reviews.freebsd.org/D20616
2019-06-29 00:49:35 +00:00
Fix style issues, a typo in "kern.ipc.nmbufs" and correctly plave and expose the value of the tunable maxmbufmem as "kern.ipc.maxmbufmem" through sysctl. Reported by: smh MFC after: 1 day
2013-07-11 12:46:35 +00:00
static quad_t maxmbufmem; /* overall real memory limit for all mbufs */
Pull in r267961 and r267973 again. Fix for issues reported will follow.
2014-06-28 03:56:17 +00:00
SYSCTL_QUAD(_kern_ipc, OID_AUTO, maxmbufmem, CTLFLAG_RDTUN | CTLFLAG_NOFETCH, &maxmbufmem, 0,
Fixing a small typo. Reviewed by: gjb Approved by: sbruno (mentor)
2013-09-05 18:18:23 +00:00
"Maximum real memory allocatable to various mbuf types");
Fix style issues, a typo in "kern.ipc.nmbufs" and correctly plave and expose the value of the tunable maxmbufmem as "kern.ipc.maxmbufmem" through sysctl. Reported by: smh MFC after: 1 day
2013-07-11 12:46:35 +00:00
Restructure mbuf send tags to provide stronger guarantees. - Perform ifp mismatch checks (to determine if a send tag is allocated for a different ifp than the one the packet is being output on), in ip_output() and ip6_output(). This avoids sending packets with send tags to ifnet drivers that don't support send tags. Since we are now checking for ifp mismatches before invoking if_output, we can now try to allocate a new tag before invoking if_output sending the original packet on the new tag if allocation succeeds. To avoid code duplication for the fragment and unfragmented cases, add ip_output_send() and ip6_output_send() as wrappers around if_output and nd6_output_ifp, respectively. All of the logic for setting send tags and dealing with send tag-related errors is done in these wrapper functions. For pseudo interfaces that wrap other network interfaces (vlan and lagg), wrapper send tags are now allocated so that ip*_output see the wrapper ifp as the ifp in the send tag. The if_transmit routines rewrite the send tags after performing an ifp mismatch check. If an ifp mismatch is detected, the transmit routines fail with EAGAIN. - To provide clearer life cycle management of send tags, especially in the presence of vlan and lagg wrapper tags, add a reference count to send tags managed via m_snd_tag_ref() and m_snd_tag_rele(). Provide a helper function (m_snd_tag_init()) for use by drivers supporting send tags. m_snd_tag_init() takes care of the if_ref on the ifp meaning that code alloating send tags via if_snd_tag_alloc no longer has to manage that manually. Similarly, m_snd_tag_rele drops the refcount on the ifp after invoking if_snd_tag_free when the last reference to a send tag is dropped. This also closes use after free races if there are pending packets in driver tx rings after the socket is closed (e.g. from tcpdrop). In order for m_free to work reliably, add a new CSUM_SND_TAG flag in csum_flags to indicate 'snd_tag' is set (rather than 'rcvif'). Drivers now also check this flag instead of checking snd_tag against NULL. This avoids false positive matches when a forwarded packet has a non-NULL rcvif that was treated as a send tag. - cxgbe was relying on snd_tag_free being called when the inp was detached so that it could kick the firmware to flush any pending work on the flow. This is because the driver doesn't require ACK messages from the firmware for every request, but instead does a kind of manual interrupt coalescing by only setting a flag to request a completion on a subset of requests. If all of the in-flight requests don't have the flag when the tag is detached from the inp, the flow might never return the credits. The current snd_tag_free command issues a flush command to force the credits to return. However, the credit return is what also frees the mbufs, and since those mbufs now hold references on the tag, this meant that snd_tag_free would never be called. To fix, explicitly drop the mbuf's reference on the snd tag when the mbuf is queued in the firmware work queue. This means that once the inp's reference on the tag goes away and all in-flight mbufs have been queued to the firmware, tag's refcount will drop to zero and snd_tag_free will kick in and send the flush request. Note that we need to avoid doing this in the middle of ethofld_tx(), so the driver grabs a temporary reference on the tag around that loop to defer the free to the end of the function in case it sends the last mbuf to the queue after the inp has dropped its reference on the tag. - mlx5 preallocates send tags and was using the ifp pointer even when the send tag wasn't in use. Explicitly use the ifp from other data structures instead. - Sprinkle some assertions in various places to assert that received packets don't have a send tag, and that other places that overwrite rcvif (e.g. 802.11 transmit) don't clobber a send tag pointer. Reviewed by: gallatin, hselasky, rgrimes, ae Sponsored by: Netflix Differential Revision: https://reviews.freebsd.org/D20117
2019-05-24 22:30:40 +00:00
static counter_u64_t snd_tag_count;
SYSCTL_COUNTER_U64(_kern_ipc, OID_AUTO, num_snd_tags, CTLFLAG_RW,
&snd_tag_count, "# of active mbuf send tags");
Make sure nmbclusters are initialized before maxsockets by running the tunable_mbinit() SYSINIT at SI_ORDER_MIDDLE before the init_maxsockets() SYSINT at SI_ORDER_ANY. Reviewed by: rwatson, zec Sponsored by: The FreeBSD Foundation MFC after: 4 weeks
2008-12-10 22:17:09 +00:00
/*
Move the mbuf memory limit calculations from init_param2() to tunable_mbinit() where it is next to where it is used later. Change the sysinit level of tunable_mbinit() from SI_SUB_TUNABLES to SI_SUB_KMEM after the VM is running. This allows to use better methods to determine the effectively available physical and virtual memory available to the kernel. Update comments. In a second step it can be merged into mbuf_init().
2013-01-17 21:28:31 +00:00
* tunable_mbinit() has to be run before any mbuf allocations are done.
Make sure nmbclusters are initialized before maxsockets by running the tunable_mbinit() SYSINIT at SI_ORDER_MIDDLE before the init_maxsockets() SYSINT at SI_ORDER_ANY. Reviewed by: rwatson, zec Sponsored by: The FreeBSD Foundation MFC after: 4 weeks
2008-12-10 22:17:09 +00:00
*/
Bring in mbuma to replace mballoc. mbuma is an Mbuf & Cluster allocator built on top of a number of extensions to the UMA framework, all included herein. Extensions to UMA worth noting: - Better layering between slab <-> zone caches; introduce Keg structure which splits off slab cache away from the zone structure and allows multiple zones to be stacked on top of a single Keg (single type of slab cache); perhaps we should look into defining a subset API on top of the Keg for special use by malloc(9), for example. - UMA_ZONE_REFCNT zones can now be added, and reference counters automagically allocated for them within the end of the associated slab structures. uma_find_refcnt() does a kextract to fetch the slab struct reference from the underlying page, and lookup the corresponding refcnt. mbuma things worth noting: - integrates mbuf & cluster allocations with extended UMA and provides caches for commonly-allocated items; defines several zones (two primary, one secondary) and two kegs. - change up certain code paths that always used to do: m_get() + m_clget() to instead just use m_getcl() and try to take advantage of the newly defined secondary Packet zone. - netstat(1) and systat(1) quickly hacked up to do basic stat reporting but additional stats work needs to be done once some other details within UMA have been taken care of and it becomes clearer to how stats will work within the modified framework. From the user perspective, one implication is that the NMBCLUSTERS compile-time option is no longer used. The maximum number of clusters is still capped off according to maxusers, but it can be made unlimited by setting the kern.ipc.nmbclusters boot-time tunable to zero. Work should be done to write an appropriate sysctl handler allowing dynamic tuning of kern.ipc.nmbclusters at runtime. Additional things worth noting/known issues (READ): - One report of 'ips' (ServeRAID) driver acting really slow in conjunction with mbuma. Need more data. Latest report is that ips is equally sucking with and without mbuma. - Giant leak in NFS code sometimes occurs, can't reproduce but currently analyzing; brueffer is able to reproduce but THIS IS NOT an mbuma-specific problem and currently occurs even WITHOUT mbuma. - Issues in network locking: there is at least one code path in the rip code where one or more locks are acquired and we end up in m_prepend() with M_WAITOK, which causes WITNESS to whine from within UMA. Current temporary solution: force all UMA allocations to be M_NOWAIT from within UMA for now to avoid deadlocks unless WITNESS is defined and we can determine with certainty that we're not holding any locks when we're M_WAITOK. - I've seen at least one weird socketbuffer empty-but- mbuf-still-attached panic. I don't believe this to be related to mbuma but please keep your eyes open, turn on debugging, and capture crash dumps. This change removes more code than it adds. A paper is available detailing the change and considering various performance issues, it was presented at BSDCan2004: http://www.unixdaemons.com/~bmilekic/netbuf_bmilekic.pdf Please read the paper for Future Work and implementation details, as well as credits. Testing and Debugging: rwatson, brueffer, Ketrien I. Saihr-Kesenchedra, ... Reviewed by: Lots of people (for different parts)
2004-05-31 21:46:06 +00:00
static void
tunable_mbinit(void *dummy)
{
Fix style issues, a typo in "kern.ipc.nmbufs" and correctly plave and expose the value of the tunable maxmbufmem as "kern.ipc.maxmbufmem" through sysctl. Reported by: smh MFC after: 1 day
2013-07-11 12:46:35 +00:00
quad_t realmem;
Move the mbuf memory limit calculations from init_param2() to tunable_mbinit() where it is next to where it is used later. Change the sysinit level of tunable_mbinit() from SI_SUB_TUNABLES to SI_SUB_KMEM after the VM is running. This allows to use better methods to determine the effectively available physical and virtual memory available to the kernel. Update comments. In a second step it can be merged into mbuf_init().
2013-01-17 21:28:31 +00:00
/*
* The default limit for all mbuf related memory is 1/2 of all
* available kernel memory (physical or kmem).
* At most it can be 3/4 of available kernel memory.
*/
Replace kernel virtual address space allocation with vmem. This provides transparent layering and better fragmentation. - Normalize functions that allocate memory to use kmem_* - Those that allocate address space are named kva_* - Those that operate on maps are named kmap_* - Implement recursive allocation handling for kmem_arena in vmem. Reviewed by: alc Tested by: pho Sponsored by: EMC / Isilon Storage Division
2013-08-07 06:21:20 +00:00
realmem = qmin((quad_t)physmem * PAGE_SIZE, vm_kmem_size);
Move the mbuf memory limit calculations from init_param2() to tunable_mbinit() where it is next to where it is used later. Change the sysinit level of tunable_mbinit() from SI_SUB_TUNABLES to SI_SUB_KMEM after the VM is running. This allows to use better methods to determine the effectively available physical and virtual memory available to the kernel. Update comments. In a second step it can be merged into mbuf_init().
2013-01-17 21:28:31 +00:00
maxmbufmem = realmem / 2;
Fix style issues, a typo in "kern.ipc.nmbufs" and correctly plave and expose the value of the tunable maxmbufmem as "kern.ipc.maxmbufmem" through sysctl. Reported by: smh MFC after: 1 day
2013-07-11 12:46:35 +00:00
TUNABLE_QUAD_FETCH("kern.ipc.maxmbufmem", &maxmbufmem);
Move the mbuf memory limit calculations from init_param2() to tunable_mbinit() where it is next to where it is used later. Change the sysinit level of tunable_mbinit() from SI_SUB_TUNABLES to SI_SUB_KMEM after the VM is running. This allows to use better methods to determine the effectively available physical and virtual memory available to the kernel. Update comments. In a second step it can be merged into mbuf_init().
2013-01-17 21:28:31 +00:00
if (maxmbufmem > realmem / 4 * 3)
maxmbufmem = realmem / 4 * 3;
Bring in mbuma to replace mballoc. mbuma is an Mbuf & Cluster allocator built on top of a number of extensions to the UMA framework, all included herein. Extensions to UMA worth noting: - Better layering between slab <-> zone caches; introduce Keg structure which splits off slab cache away from the zone structure and allows multiple zones to be stacked on top of a single Keg (single type of slab cache); perhaps we should look into defining a subset API on top of the Keg for special use by malloc(9), for example. - UMA_ZONE_REFCNT zones can now be added, and reference counters automagically allocated for them within the end of the associated slab structures. uma_find_refcnt() does a kextract to fetch the slab struct reference from the underlying page, and lookup the corresponding refcnt. mbuma things worth noting: - integrates mbuf & cluster allocations with extended UMA and provides caches for commonly-allocated items; defines several zones (two primary, one secondary) and two kegs. - change up certain code paths that always used to do: m_get() + m_clget() to instead just use m_getcl() and try to take advantage of the newly defined secondary Packet zone. - netstat(1) and systat(1) quickly hacked up to do basic stat reporting but additional stats work needs to be done once some other details within UMA have been taken care of and it becomes clearer to how stats will work within the modified framework. From the user perspective, one implication is that the NMBCLUSTERS compile-time option is no longer used. The maximum number of clusters is still capped off according to maxusers, but it can be made unlimited by setting the kern.ipc.nmbclusters boot-time tunable to zero. Work should be done to write an appropriate sysctl handler allowing dynamic tuning of kern.ipc.nmbclusters at runtime. Additional things worth noting/known issues (READ): - One report of 'ips' (ServeRAID) driver acting really slow in conjunction with mbuma. Need more data. Latest report is that ips is equally sucking with and without mbuma. - Giant leak in NFS code sometimes occurs, can't reproduce but currently analyzing; brueffer is able to reproduce but THIS IS NOT an mbuma-specific problem and currently occurs even WITHOUT mbuma. - Issues in network locking: there is at least one code path in the rip code where one or more locks are acquired and we end up in m_prepend() with M_WAITOK, which causes WITNESS to whine from within UMA. Current temporary solution: force all UMA allocations to be M_NOWAIT from within UMA for now to avoid deadlocks unless WITNESS is defined and we can determine with certainty that we're not holding any locks when we're M_WAITOK. - I've seen at least one weird socketbuffer empty-but- mbuf-still-attached panic. I don't believe this to be related to mbuma but please keep your eyes open, turn on debugging, and capture crash dumps. This change removes more code than it adds. A paper is available detailing the change and considering various performance issues, it was presented at BSDCan2004: http://www.unixdaemons.com/~bmilekic/netbuf_bmilekic.pdf Please read the paper for Future Work and implementation details, as well as credits. Testing and Debugging: rwatson, brueffer, Ketrien I. Saihr-Kesenchedra, ... Reviewed by: Lots of people (for different parts)
2004-05-31 21:46:06 +00:00
Allow nmbjumbop, nmbjumbo9, and nmbjumbo16 to be set directly via loader tunables. MFC after: 1 month
2012-08-23 21:32:02 +00:00
TUNABLE_INT_FETCH("kern.ipc.nmbclusters", &nmbclusters);
Complete r243631 by applying the remainder of kern_mbuf.c that got lost while merging into the commit tree. MFC after: 1 month X-MFC-with: r243631
2012-11-27 23:16:56 +00:00
if (nmbclusters == 0)
nmbclusters = maxmbufmem / MCLBYTES / 4;
Allow nmbjumbop, nmbjumbo9, and nmbjumbo16 to be set directly via loader tunables. MFC after: 1 month
2012-08-23 21:32:02 +00:00
TUNABLE_INT_FETCH("kern.ipc.nmbjumbop", &nmbjumbop);
if (nmbjumbop == 0)
Complete r243631 by applying the remainder of kern_mbuf.c that got lost while merging into the commit tree. MFC after: 1 month X-MFC-with: r243631
2012-11-27 23:16:56 +00:00
nmbjumbop = maxmbufmem / MJUMPAGESIZE / 4;
Allow nmbjumbop, nmbjumbo9, and nmbjumbo16 to be set directly via loader tunables. MFC after: 1 month
2012-08-23 21:32:02 +00:00
TUNABLE_INT_FETCH("kern.ipc.nmbjumbo9", &nmbjumbo9);
if (nmbjumbo9 == 0)
Complete r243631 by applying the remainder of kern_mbuf.c that got lost while merging into the commit tree. MFC after: 1 month X-MFC-with: r243631
2012-11-27 23:16:56 +00:00
nmbjumbo9 = maxmbufmem / MJUM9BYTES / 6;
Allow nmbjumbop, nmbjumbo9, and nmbjumbo16 to be set directly via loader tunables. MFC after: 1 month
2012-08-23 21:32:02 +00:00
TUNABLE_INT_FETCH("kern.ipc.nmbjumbo16", &nmbjumbo16);
if (nmbjumbo16 == 0)
Complete r243631 by applying the remainder of kern_mbuf.c that got lost while merging into the commit tree. MFC after: 1 month X-MFC-with: r243631
2012-11-27 23:16:56 +00:00
nmbjumbo16 = maxmbufmem / MJUM16BYTES / 6;
/*
* We need at least as many mbufs as we have clusters of
* the various types added together.
*/
TUNABLE_INT_FETCH("kern.ipc.nmbufs", &nmbufs);
if (nmbufs < nmbclusters + nmbjumbop + nmbjumbo9 + nmbjumbo16)
nmbufs = lmax(maxmbufmem / MSIZE / 5,
More style cleanups.
2012-12-07 22:22:04 +00:00
nmbclusters + nmbjumbop + nmbjumbo9 + nmbjumbo16);
Bring in mbuma to replace mballoc. mbuma is an Mbuf & Cluster allocator built on top of a number of extensions to the UMA framework, all included herein. Extensions to UMA worth noting: - Better layering between slab <-> zone caches; introduce Keg structure which splits off slab cache away from the zone structure and allows multiple zones to be stacked on top of a single Keg (single type of slab cache); perhaps we should look into defining a subset API on top of the Keg for special use by malloc(9), for example. - UMA_ZONE_REFCNT zones can now be added, and reference counters automagically allocated for them within the end of the associated slab structures. uma_find_refcnt() does a kextract to fetch the slab struct reference from the underlying page, and lookup the corresponding refcnt. mbuma things worth noting: - integrates mbuf & cluster allocations with extended UMA and provides caches for commonly-allocated items; defines several zones (two primary, one secondary) and two kegs. - change up certain code paths that always used to do: m_get() + m_clget() to instead just use m_getcl() and try to take advantage of the newly defined secondary Packet zone. - netstat(1) and systat(1) quickly hacked up to do basic stat reporting but additional stats work needs to be done once some other details within UMA have been taken care of and it becomes clearer to how stats will work within the modified framework. From the user perspective, one implication is that the NMBCLUSTERS compile-time option is no longer used. The maximum number of clusters is still capped off according to maxusers, but it can be made unlimited by setting the kern.ipc.nmbclusters boot-time tunable to zero. Work should be done to write an appropriate sysctl handler allowing dynamic tuning of kern.ipc.nmbclusters at runtime. Additional things worth noting/known issues (READ): - One report of 'ips' (ServeRAID) driver acting really slow in conjunction with mbuma. Need more data. Latest report is that ips is equally sucking with and without mbuma. - Giant leak in NFS code sometimes occurs, can't reproduce but currently analyzing; brueffer is able to reproduce but THIS IS NOT an mbuma-specific problem and currently occurs even WITHOUT mbuma. - Issues in network locking: there is at least one code path in the rip code where one or more locks are acquired and we end up in m_prepend() with M_WAITOK, which causes WITNESS to whine from within UMA. Current temporary solution: force all UMA allocations to be M_NOWAIT from within UMA for now to avoid deadlocks unless WITNESS is defined and we can determine with certainty that we're not holding any locks when we're M_WAITOK. - I've seen at least one weird socketbuffer empty-but- mbuf-still-attached panic. I don't believe this to be related to mbuma but please keep your eyes open, turn on debugging, and capture crash dumps. This change removes more code than it adds. A paper is available detailing the change and considering various performance issues, it was presented at BSDCan2004: http://www.unixdaemons.com/~bmilekic/netbuf_bmilekic.pdf Please read the paper for Future Work and implementation details, as well as credits. Testing and Debugging: rwatson, brueffer, Ketrien I. Saihr-Kesenchedra, ... Reviewed by: Lots of people (for different parts)
2004-05-31 21:46:06 +00:00
}
Move the mbuf memory limit calculations from init_param2() to tunable_mbinit() where it is next to where it is used later. Change the sysinit level of tunable_mbinit() from SI_SUB_TUNABLES to SI_SUB_KMEM after the VM is running. This allows to use better methods to determine the effectively available physical and virtual memory available to the kernel. Update comments. In a second step it can be merged into mbuf_init().
2013-01-17 21:28:31 +00:00
SYSINIT(tunable_mbinit, SI_SUB_KMEM, SI_ORDER_MIDDLE, tunable_mbinit, NULL);
Bring in mbuma to replace mballoc. mbuma is an Mbuf & Cluster allocator built on top of a number of extensions to the UMA framework, all included herein. Extensions to UMA worth noting: - Better layering between slab <-> zone caches; introduce Keg structure which splits off slab cache away from the zone structure and allows multiple zones to be stacked on top of a single Keg (single type of slab cache); perhaps we should look into defining a subset API on top of the Keg for special use by malloc(9), for example. - UMA_ZONE_REFCNT zones can now be added, and reference counters automagically allocated for them within the end of the associated slab structures. uma_find_refcnt() does a kextract to fetch the slab struct reference from the underlying page, and lookup the corresponding refcnt. mbuma things worth noting: - integrates mbuf & cluster allocations with extended UMA and provides caches for commonly-allocated items; defines several zones (two primary, one secondary) and two kegs. - change up certain code paths that always used to do: m_get() + m_clget() to instead just use m_getcl() and try to take advantage of the newly defined secondary Packet zone. - netstat(1) and systat(1) quickly hacked up to do basic stat reporting but additional stats work needs to be done once some other details within UMA have been taken care of and it becomes clearer to how stats will work within the modified framework. From the user perspective, one implication is that the NMBCLUSTERS compile-time option is no longer used. The maximum number of clusters is still capped off according to maxusers, but it can be made unlimited by setting the kern.ipc.nmbclusters boot-time tunable to zero. Work should be done to write an appropriate sysctl handler allowing dynamic tuning of kern.ipc.nmbclusters at runtime. Additional things worth noting/known issues (READ): - One report of 'ips' (ServeRAID) driver acting really slow in conjunction with mbuma. Need more data. Latest report is that ips is equally sucking with and without mbuma. - Giant leak in NFS code sometimes occurs, can't reproduce but currently analyzing; brueffer is able to reproduce but THIS IS NOT an mbuma-specific problem and currently occurs even WITHOUT mbuma. - Issues in network locking: there is at least one code path in the rip code where one or more locks are acquired and we end up in m_prepend() with M_WAITOK, which causes WITNESS to whine from within UMA. Current temporary solution: force all UMA allocations to be M_NOWAIT from within UMA for now to avoid deadlocks unless WITNESS is defined and we can determine with certainty that we're not holding any locks when we're M_WAITOK. - I've seen at least one weird socketbuffer empty-but- mbuf-still-attached panic. I don't believe this to be related to mbuma but please keep your eyes open, turn on debugging, and capture crash dumps. This change removes more code than it adds. A paper is available detailing the change and considering various performance issues, it was presented at BSDCan2004: http://www.unixdaemons.com/~bmilekic/netbuf_bmilekic.pdf Please read the paper for Future Work and implementation details, as well as credits. Testing and Debugging: rwatson, brueffer, Ketrien I. Saihr-Kesenchedra, ... Reviewed by: Lots of people (for different parts)
2004-05-31 21:46:06 +00:00
Allow for nmbclusters and maxsockets to be increased via sysctl. An eventhandler is used to update all the various zones that depend on these values.
2006-04-21 09:25:40 +00:00
static int
sysctl_nmbclusters(SYSCTL_HANDLER_ARGS)
{
int error, newnmbclusters;
newnmbclusters = nmbclusters;
Style cleanups.
2012-12-07 22:19:41 +00:00
error = sysctl_handle_int(oidp, &newnmbclusters, 0, req);
Ignore attempts to set the nmbcluster sysctls to their current value rather than failing with an error. Reviewed by: andre Approved by: re (delphij) MFC after: 2 weeks
2013-10-10 16:11:34 +00:00
if (error == 0 && req->newptr && newnmbclusters != nmbclusters) {
Base the mbuf related limits on the available physical memory or kernel memory, whichever is lower. The overall mbuf related memory limit must be set so that mbufs (and clusters of various sizes) can't exhaust physical RAM or KVM. The limit is set to half of the physical RAM or KVM (whichever is lower) as the baseline. In any normal scenario we want to leave at least half of the physmem/kvm for other kernel functions and userspace to prevent it from swapping too easily. Via a tunable kern.maxmbufmem the limit can be upped to at most 3/4 of physmem/kvm. At the same time divorce maxfiles from maxusers and set maxfiles to physpages / 8 with a floor based on maxusers. This way busy servers can make use of the significantly increased mbuf limits with a much larger number of open sockets. Tidy up ordering in init_param2() and check up on some users of those values calculated here. Out of the overall mbuf memory limit 2K clusters and 4K (page size) clusters to get 1/4 each because these are the most heavily used mbuf sizes. 2K clusters are used for MTU 1500 ethernet inbound packets. 4K clusters are used whenever possible for sends on sockets and thus outbound packets. The larger cluster sizes of 9K and 16K are limited to 1/6 of the overall mbuf memory limit. When jumbo MTU's are used these large clusters will end up only on the inbound path. They are not used on outbound, there it's still 4K. Yes, that will stay that way because otherwise we run into lots of complications in the stack. And it really isn't a problem, so don't make a scene. Normal mbufs (256B) weren't limited at all previously. This was problematic as there are certain places in the kernel that on allocation failure of clusters try to piece together their packet from smaller mbufs. The mbuf limit is the number of all other mbuf sizes together plus some more to allow for standalone mbufs (ACK for example) and to send off a copy of a cluster. Unfortunately there isn't a way to set an overall limit for all mbuf memory together as UMA doesn't support such a limiting. NB: Every cluster also has an mbuf associated with it. Two examples on the revised mbuf sizing limits: 1GB KVM: 512MB limit for mbufs 419,430 mbufs 65,536 2K mbuf clusters 32,768 4K mbuf clusters 9,709 9K mbuf clusters 5,461 16K mbuf clusters 16GB RAM: 8GB limit for mbufs 33,554,432 mbufs 1,048,576 2K mbuf clusters 524,288 4K mbuf clusters 155,344 9K mbuf clusters 87,381 16K mbuf clusters These defaults should be sufficient for even the most demanding network loads. MFC after: 1 month
2012-11-27 21:19:58 +00:00
if (newnmbclusters > nmbclusters &&
nmbufs >= nmbclusters + nmbjumbop + nmbjumbo9 + nmbjumbo16) {
Allow for nmbclusters and maxsockets to be increased via sysctl. An eventhandler is used to update all the various zones that depend on these values.
2006-04-21 09:25:40 +00:00
nmbclusters = newnmbclusters;
Make use of the fact that uma_zone_set_max(9) already returns the rounded limit making a call to uma_zone_get_max(9) unnecessary. MFC after: 1 day
2013-07-11 12:53:13 +00:00
nmbclusters = uma_zone_set_max(zone_clust, nmbclusters);
Allow for nmbclusters and maxsockets to be increased via sysctl. An eventhandler is used to update all the various zones that depend on these values.
2006-04-21 09:25:40 +00:00
EVENTHANDLER_INVOKE(nmbclusters_change);
} else
error = EINVAL;
}
return (error);
}
Mark more nodes as CTLFLAG_MPSAFE or CTLFLAG_NEEDGIANT (17 of many) r357614 added CTLFLAG_NEEDGIANT to make it easier to find nodes that are still not MPSAFE (or already are but aren’t properly marked). Use it in preparation for a general review of all nodes. This is non-functional change that adds annotations to SYSCTL_NODE and SYSCTL_PROC nodes using one of the soon-to-be-required flags. Mark all obvious cases as MPSAFE. All entries that haven't been marked as MPSAFE before are by default marked as NEEDGIANT Approved by: kib (mentor, blanket) Commented by: kib, gallatin, melifaro Differential Revision: https://reviews.freebsd.org/D23718
2020-02-26 14:26:36 +00:00
SYSCTL_PROC(_kern_ipc, OID_AUTO, nmbclusters,
CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_NEEDGIANT, &nmbclusters, 0,
sysctl_nmbclusters, "IU",
Bring in mbuma to replace mballoc. mbuma is an Mbuf & Cluster allocator built on top of a number of extensions to the UMA framework, all included herein. Extensions to UMA worth noting: - Better layering between slab <-> zone caches; introduce Keg structure which splits off slab cache away from the zone structure and allows multiple zones to be stacked on top of a single Keg (single type of slab cache); perhaps we should look into defining a subset API on top of the Keg for special use by malloc(9), for example. - UMA_ZONE_REFCNT zones can now be added, and reference counters automagically allocated for them within the end of the associated slab structures. uma_find_refcnt() does a kextract to fetch the slab struct reference from the underlying page, and lookup the corresponding refcnt. mbuma things worth noting: - integrates mbuf & cluster allocations with extended UMA and provides caches for commonly-allocated items; defines several zones (two primary, one secondary) and two kegs. - change up certain code paths that always used to do: m_get() + m_clget() to instead just use m_getcl() and try to take advantage of the newly defined secondary Packet zone. - netstat(1) and systat(1) quickly hacked up to do basic stat reporting but additional stats work needs to be done once some other details within UMA have been taken care of and it becomes clearer to how stats will work within the modified framework. From the user perspective, one implication is that the NMBCLUSTERS compile-time option is no longer used. The maximum number of clusters is still capped off according to maxusers, but it can be made unlimited by setting the kern.ipc.nmbclusters boot-time tunable to zero. Work should be done to write an appropriate sysctl handler allowing dynamic tuning of kern.ipc.nmbclusters at runtime. Additional things worth noting/known issues (READ): - One report of 'ips' (ServeRAID) driver acting really slow in conjunction with mbuma. Need more data. Latest report is that ips is equally sucking with and without mbuma. - Giant leak in NFS code sometimes occurs, can't reproduce but currently analyzing; brueffer is able to reproduce but THIS IS NOT an mbuma-specific problem and currently occurs even WITHOUT mbuma. - Issues in network locking: there is at least one code path in the rip code where one or more locks are acquired and we end up in m_prepend() with M_WAITOK, which causes WITNESS to whine from within UMA. Current temporary solution: force all UMA allocations to be M_NOWAIT from within UMA for now to avoid deadlocks unless WITNESS is defined and we can determine with certainty that we're not holding any locks when we're M_WAITOK. - I've seen at least one weird socketbuffer empty-but- mbuf-still-attached panic. I don't believe this to be related to mbuma but please keep your eyes open, turn on debugging, and capture crash dumps. This change removes more code than it adds. A paper is available detailing the change and considering various performance issues, it was presented at BSDCan2004: http://www.unixdaemons.com/~bmilekic/netbuf_bmilekic.pdf Please read the paper for Future Work and implementation details, as well as credits. Testing and Debugging: rwatson, brueffer, Ketrien I. Saihr-Kesenchedra, ... Reviewed by: Lots of people (for different parts)
2004-05-31 21:46:06 +00:00
"Maximum number of mbuf clusters allowed");
- Puts default limits on 4k/9k and 16k zones for mbufs all based on 1/2 of each of the successive limits tied to the limit for 2k clusters. - Adds real functionality in so that doing a sysctl to change these actually changes them :-) MFC after: 1 week
2007-12-05 15:29:44 +00:00
static int
sysctl_nmbjumbop(SYSCTL_HANDLER_ARGS)
{
int error, newnmbjumbop;
newnmbjumbop = nmbjumbop;
Style cleanups.
2012-12-07 22:19:41 +00:00
error = sysctl_handle_int(oidp, &newnmbjumbop, 0, req);
Ignore attempts to set the nmbcluster sysctls to their current value rather than failing with an error. Reviewed by: andre Approved by: re (delphij) MFC after: 2 weeks
2013-10-10 16:11:34 +00:00
if (error == 0 && req->newptr && newnmbjumbop != nmbjumbop) {
Base the mbuf related limits on the available physical memory or kernel memory, whichever is lower. The overall mbuf related memory limit must be set so that mbufs (and clusters of various sizes) can't exhaust physical RAM or KVM. The limit is set to half of the physical RAM or KVM (whichever is lower) as the baseline. In any normal scenario we want to leave at least half of the physmem/kvm for other kernel functions and userspace to prevent it from swapping too easily. Via a tunable kern.maxmbufmem the limit can be upped to at most 3/4 of physmem/kvm. At the same time divorce maxfiles from maxusers and set maxfiles to physpages / 8 with a floor based on maxusers. This way busy servers can make use of the significantly increased mbuf limits with a much larger number of open sockets. Tidy up ordering in init_param2() and check up on some users of those values calculated here. Out of the overall mbuf memory limit 2K clusters and 4K (page size) clusters to get 1/4 each because these are the most heavily used mbuf sizes. 2K clusters are used for MTU 1500 ethernet inbound packets. 4K clusters are used whenever possible for sends on sockets and thus outbound packets. The larger cluster sizes of 9K and 16K are limited to 1/6 of the overall mbuf memory limit. When jumbo MTU's are used these large clusters will end up only on the inbound path. They are not used on outbound, there it's still 4K. Yes, that will stay that way because otherwise we run into lots of complications in the stack. And it really isn't a problem, so don't make a scene. Normal mbufs (256B) weren't limited at all previously. This was problematic as there are certain places in the kernel that on allocation failure of clusters try to piece together their packet from smaller mbufs. The mbuf limit is the number of all other mbuf sizes together plus some more to allow for standalone mbufs (ACK for example) and to send off a copy of a cluster. Unfortunately there isn't a way to set an overall limit for all mbuf memory together as UMA doesn't support such a limiting. NB: Every cluster also has an mbuf associated with it. Two examples on the revised mbuf sizing limits: 1GB KVM: 512MB limit for mbufs 419,430 mbufs 65,536 2K mbuf clusters 32,768 4K mbuf clusters 9,709 9K mbuf clusters 5,461 16K mbuf clusters 16GB RAM: 8GB limit for mbufs 33,554,432 mbufs 1,048,576 2K mbuf clusters 524,288 4K mbuf clusters 155,344 9K mbuf clusters 87,381 16K mbuf clusters These defaults should be sufficient for even the most demanding network loads. MFC after: 1 month
2012-11-27 21:19:58 +00:00
if (newnmbjumbop > nmbjumbop &&
nmbufs >= nmbclusters + nmbjumbop + nmbjumbo9 + nmbjumbo16) {
- Puts default limits on 4k/9k and 16k zones for mbufs all based on 1/2 of each of the successive limits tied to the limit for 2k clusters. - Adds real functionality in so that doing a sysctl to change these actually changes them :-) MFC after: 1 week
2007-12-05 15:29:44 +00:00
nmbjumbop = newnmbjumbop;
Make use of the fact that uma_zone_set_max(9) already returns the rounded limit making a call to uma_zone_get_max(9) unnecessary. MFC after: 1 day
2013-07-11 12:53:13 +00:00
nmbjumbop = uma_zone_set_max(zone_jumbop, nmbjumbop);
- Puts default limits on 4k/9k and 16k zones for mbufs all based on 1/2 of each of the successive limits tied to the limit for 2k clusters. - Adds real functionality in so that doing a sysctl to change these actually changes them :-) MFC after: 1 week
2007-12-05 15:29:44 +00:00
} else
error = EINVAL;
}
return (error);
}
Mark more nodes as CTLFLAG_MPSAFE or CTLFLAG_NEEDGIANT (17 of many) r357614 added CTLFLAG_NEEDGIANT to make it easier to find nodes that are still not MPSAFE (or already are but aren’t properly marked). Use it in preparation for a general review of all nodes. This is non-functional change that adds annotations to SYSCTL_NODE and SYSCTL_PROC nodes using one of the soon-to-be-required flags. Mark all obvious cases as MPSAFE. All entries that haven't been marked as MPSAFE before are by default marked as NEEDGIANT Approved by: kib (mentor, blanket) Commented by: kib, gallatin, melifaro Differential Revision: https://reviews.freebsd.org/D23718
2020-02-26 14:26:36 +00:00
SYSCTL_PROC(_kern_ipc, OID_AUTO, nmbjumbop,
CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_NEEDGIANT, &nmbjumbop, 0,
sysctl_nmbjumbop, "IU",
More style cleanups.
2012-12-07 22:22:04 +00:00
"Maximum number of mbuf page size jumbo clusters allowed");
- Puts default limits on 4k/9k and 16k zones for mbufs all based on 1/2 of each of the successive limits tied to the limit for 2k clusters. - Adds real functionality in so that doing a sysctl to change these actually changes them :-) MFC after: 1 week
2007-12-05 15:29:44 +00:00
static int
sysctl_nmbjumbo9(SYSCTL_HANDLER_ARGS)
{
int error, newnmbjumbo9;
newnmbjumbo9 = nmbjumbo9;
Style cleanups.
2012-12-07 22:19:41 +00:00
error = sysctl_handle_int(oidp, &newnmbjumbo9, 0, req);
Ignore attempts to set the nmbcluster sysctls to their current value rather than failing with an error. Reviewed by: andre Approved by: re (delphij) MFC after: 2 weeks
2013-10-10 16:11:34 +00:00
if (error == 0 && req->newptr && newnmbjumbo9 != nmbjumbo9) {
Fix style issues, a typo in "kern.ipc.nmbufs" and correctly plave and expose the value of the tunable maxmbufmem as "kern.ipc.maxmbufmem" through sysctl. Reported by: smh MFC after: 1 day
2013-07-11 12:46:35 +00:00
if (newnmbjumbo9 > nmbjumbo9 &&
Base the mbuf related limits on the available physical memory or kernel memory, whichever is lower. The overall mbuf related memory limit must be set so that mbufs (and clusters of various sizes) can't exhaust physical RAM or KVM. The limit is set to half of the physical RAM or KVM (whichever is lower) as the baseline. In any normal scenario we want to leave at least half of the physmem/kvm for other kernel functions and userspace to prevent it from swapping too easily. Via a tunable kern.maxmbufmem the limit can be upped to at most 3/4 of physmem/kvm. At the same time divorce maxfiles from maxusers and set maxfiles to physpages / 8 with a floor based on maxusers. This way busy servers can make use of the significantly increased mbuf limits with a much larger number of open sockets. Tidy up ordering in init_param2() and check up on some users of those values calculated here. Out of the overall mbuf memory limit 2K clusters and 4K (page size) clusters to get 1/4 each because these are the most heavily used mbuf sizes. 2K clusters are used for MTU 1500 ethernet inbound packets. 4K clusters are used whenever possible for sends on sockets and thus outbound packets. The larger cluster sizes of 9K and 16K are limited to 1/6 of the overall mbuf memory limit. When jumbo MTU's are used these large clusters will end up only on the inbound path. They are not used on outbound, there it's still 4K. Yes, that will stay that way because otherwise we run into lots of complications in the stack. And it really isn't a problem, so don't make a scene. Normal mbufs (256B) weren't limited at all previously. This was problematic as there are certain places in the kernel that on allocation failure of clusters try to piece together their packet from smaller mbufs. The mbuf limit is the number of all other mbuf sizes together plus some more to allow for standalone mbufs (ACK for example) and to send off a copy of a cluster. Unfortunately there isn't a way to set an overall limit for all mbuf memory together as UMA doesn't support such a limiting. NB: Every cluster also has an mbuf associated with it. Two examples on the revised mbuf sizing limits: 1GB KVM: 512MB limit for mbufs 419,430 mbufs 65,536 2K mbuf clusters 32,768 4K mbuf clusters 9,709 9K mbuf clusters 5,461 16K mbuf clusters 16GB RAM: 8GB limit for mbufs 33,554,432 mbufs 1,048,576 2K mbuf clusters 524,288 4K mbuf clusters 155,344 9K mbuf clusters 87,381 16K mbuf clusters These defaults should be sufficient for even the most demanding network loads. MFC after: 1 month
2012-11-27 21:19:58 +00:00
nmbufs >= nmbclusters + nmbjumbop + nmbjumbo9 + nmbjumbo16) {
- Puts default limits on 4k/9k and 16k zones for mbufs all based on 1/2 of each of the successive limits tied to the limit for 2k clusters. - Adds real functionality in so that doing a sysctl to change these actually changes them :-) MFC after: 1 week
2007-12-05 15:29:44 +00:00
nmbjumbo9 = newnmbjumbo9;
Make use of the fact that uma_zone_set_max(9) already returns the rounded limit making a call to uma_zone_get_max(9) unnecessary. MFC after: 1 day
2013-07-11 12:53:13 +00:00
nmbjumbo9 = uma_zone_set_max(zone_jumbo9, nmbjumbo9);
- Puts default limits on 4k/9k and 16k zones for mbufs all based on 1/2 of each of the successive limits tied to the limit for 2k clusters. - Adds real functionality in so that doing a sysctl to change these actually changes them :-) MFC after: 1 week
2007-12-05 15:29:44 +00:00
} else
error = EINVAL;
}
return (error);
}
Mark more nodes as CTLFLAG_MPSAFE or CTLFLAG_NEEDGIANT (17 of many) r357614 added CTLFLAG_NEEDGIANT to make it easier to find nodes that are still not MPSAFE (or already are but aren’t properly marked). Use it in preparation for a general review of all nodes. This is non-functional change that adds annotations to SYSCTL_NODE and SYSCTL_PROC nodes using one of the soon-to-be-required flags. Mark all obvious cases as MPSAFE. All entries that haven't been marked as MPSAFE before are by default marked as NEEDGIANT Approved by: kib (mentor, blanket) Commented by: kib, gallatin, melifaro Differential Revision: https://reviews.freebsd.org/D23718
2020-02-26 14:26:36 +00:00
SYSCTL_PROC(_kern_ipc, OID_AUTO, nmbjumbo9,
CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_NEEDGIANT, &nmbjumbo9, 0,
sysctl_nmbjumbo9, "IU",
Style cleanups.
2012-12-07 22:19:41 +00:00
"Maximum number of mbuf 9k jumbo clusters allowed");
- Puts default limits on 4k/9k and 16k zones for mbufs all based on 1/2 of each of the successive limits tied to the limit for 2k clusters. - Adds real functionality in so that doing a sysctl to change these actually changes them :-) MFC after: 1 week
2007-12-05 15:29:44 +00:00
static int
sysctl_nmbjumbo16(SYSCTL_HANDLER_ARGS)
{
int error, newnmbjumbo16;
newnmbjumbo16 = nmbjumbo16;
Style cleanups.
2012-12-07 22:19:41 +00:00
error = sysctl_handle_int(oidp, &newnmbjumbo16, 0, req);
Ignore attempts to set the nmbcluster sysctls to their current value rather than failing with an error. Reviewed by: andre Approved by: re (delphij) MFC after: 2 weeks
2013-10-10 16:11:34 +00:00
if (error == 0 && req->newptr && newnmbjumbo16 != nmbjumbo16) {
Base the mbuf related limits on the available physical memory or kernel memory, whichever is lower. The overall mbuf related memory limit must be set so that mbufs (and clusters of various sizes) can't exhaust physical RAM or KVM. The limit is set to half of the physical RAM or KVM (whichever is lower) as the baseline. In any normal scenario we want to leave at least half of the physmem/kvm for other kernel functions and userspace to prevent it from swapping too easily. Via a tunable kern.maxmbufmem the limit can be upped to at most 3/4 of physmem/kvm. At the same time divorce maxfiles from maxusers and set maxfiles to physpages / 8 with a floor based on maxusers. This way busy servers can make use of the significantly increased mbuf limits with a much larger number of open sockets. Tidy up ordering in init_param2() and check up on some users of those values calculated here. Out of the overall mbuf memory limit 2K clusters and 4K (page size) clusters to get 1/4 each because these are the most heavily used mbuf sizes. 2K clusters are used for MTU 1500 ethernet inbound packets. 4K clusters are used whenever possible for sends on sockets and thus outbound packets. The larger cluster sizes of 9K and 16K are limited to 1/6 of the overall mbuf memory limit. When jumbo MTU's are used these large clusters will end up only on the inbound path. They are not used on outbound, there it's still 4K. Yes, that will stay that way because otherwise we run into lots of complications in the stack. And it really isn't a problem, so don't make a scene. Normal mbufs (256B) weren't limited at all previously. This was problematic as there are certain places in the kernel that on allocation failure of clusters try to piece together their packet from smaller mbufs. The mbuf limit is the number of all other mbuf sizes together plus some more to allow for standalone mbufs (ACK for example) and to send off a copy of a cluster. Unfortunately there isn't a way to set an overall limit for all mbuf memory together as UMA doesn't support such a limiting. NB: Every cluster also has an mbuf associated with it. Two examples on the revised mbuf sizing limits: 1GB KVM: 512MB limit for mbufs 419,430 mbufs 65,536 2K mbuf clusters 32,768 4K mbuf clusters 9,709 9K mbuf clusters 5,461 16K mbuf clusters 16GB RAM: 8GB limit for mbufs 33,554,432 mbufs 1,048,576 2K mbuf clusters 524,288 4K mbuf clusters 155,344 9K mbuf clusters 87,381 16K mbuf clusters These defaults should be sufficient for even the most demanding network loads. MFC after: 1 month
2012-11-27 21:19:58 +00:00
if (newnmbjumbo16 > nmbjumbo16 &&
nmbufs >= nmbclusters + nmbjumbop + nmbjumbo9 + nmbjumbo16) {
- Puts default limits on 4k/9k and 16k zones for mbufs all based on 1/2 of each of the successive limits tied to the limit for 2k clusters. - Adds real functionality in so that doing a sysctl to change these actually changes them :-) MFC after: 1 week
2007-12-05 15:29:44 +00:00
nmbjumbo16 = newnmbjumbo16;
Make use of the fact that uma_zone_set_max(9) already returns the rounded limit making a call to uma_zone_get_max(9) unnecessary. MFC after: 1 day
2013-07-11 12:53:13 +00:00
nmbjumbo16 = uma_zone_set_max(zone_jumbo16, nmbjumbo16);
- Puts default limits on 4k/9k and 16k zones for mbufs all based on 1/2 of each of the successive limits tied to the limit for 2k clusters. - Adds real functionality in so that doing a sysctl to change these actually changes them :-) MFC after: 1 week
2007-12-05 15:29:44 +00:00
} else
error = EINVAL;
}
return (error);
}
Mark more nodes as CTLFLAG_MPSAFE or CTLFLAG_NEEDGIANT (17 of many) r357614 added CTLFLAG_NEEDGIANT to make it easier to find nodes that are still not MPSAFE (or already are but aren’t properly marked). Use it in preparation for a general review of all nodes. This is non-functional change that adds annotations to SYSCTL_NODE and SYSCTL_PROC nodes using one of the soon-to-be-required flags. Mark all obvious cases as MPSAFE. All entries that haven't been marked as MPSAFE before are by default marked as NEEDGIANT Approved by: kib (mentor, blanket) Commented by: kib, gallatin, melifaro Differential Revision: https://reviews.freebsd.org/D23718
2020-02-26 14:26:36 +00:00
SYSCTL_PROC(_kern_ipc, OID_AUTO, nmbjumbo16,
CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_NEEDGIANT, &nmbjumbo16, 0,
sysctl_nmbjumbo16, "IU",
Mandatory mbuf cluster reference counting and groundwork for UMA based jumbo 9k and jumbo 16k cluster support. All mbuf's with external storage attached are mandatory reference counted. For clusters and jumbo clusters UMA provides the refcnt storage directly. It does not have to be separatly allocated. Any other type of external storage gets its own refcnt allocated from an UMA mbuf refcnt zone instead of normal kernel malloc. The refcount API MEXT_ADD_REF() and MEXT_REM_REF() is no longer publically accessible. The proper m_* functions have to be used. mb_ctor_clust() and mb_dtor_clust() both handle normal 2K as well as 9k and 16k clusters. Clusters and jumbo clusters may be obtained without attaching it immideatly to an mbuf. This is for high performance cluster allocation in network drivers where mbufs are attached after the cluster has been filled. Tested by: rwatson Sponsored by: TCP/IP Optimizations Fundraise 2005
2005-11-02 16:20:36 +00:00
"Maximum number of mbuf 16k jumbo clusters allowed");
- Puts default limits on 4k/9k and 16k zones for mbufs all based on 1/2 of each of the successive limits tied to the limit for 2k clusters. - Adds real functionality in so that doing a sysctl to change these actually changes them :-) MFC after: 1 week
2007-12-05 15:29:44 +00:00
Base the mbuf related limits on the available physical memory or kernel memory, whichever is lower. The overall mbuf related memory limit must be set so that mbufs (and clusters of various sizes) can't exhaust physical RAM or KVM. The limit is set to half of the physical RAM or KVM (whichever is lower) as the baseline. In any normal scenario we want to leave at least half of the physmem/kvm for other kernel functions and userspace to prevent it from swapping too easily. Via a tunable kern.maxmbufmem the limit can be upped to at most 3/4 of physmem/kvm. At the same time divorce maxfiles from maxusers and set maxfiles to physpages / 8 with a floor based on maxusers. This way busy servers can make use of the significantly increased mbuf limits with a much larger number of open sockets. Tidy up ordering in init_param2() and check up on some users of those values calculated here. Out of the overall mbuf memory limit 2K clusters and 4K (page size) clusters to get 1/4 each because these are the most heavily used mbuf sizes. 2K clusters are used for MTU 1500 ethernet inbound packets. 4K clusters are used whenever possible for sends on sockets and thus outbound packets. The larger cluster sizes of 9K and 16K are limited to 1/6 of the overall mbuf memory limit. When jumbo MTU's are used these large clusters will end up only on the inbound path. They are not used on outbound, there it's still 4K. Yes, that will stay that way because otherwise we run into lots of complications in the stack. And it really isn't a problem, so don't make a scene. Normal mbufs (256B) weren't limited at all previously. This was problematic as there are certain places in the kernel that on allocation failure of clusters try to piece together their packet from smaller mbufs. The mbuf limit is the number of all other mbuf sizes together plus some more to allow for standalone mbufs (ACK for example) and to send off a copy of a cluster. Unfortunately there isn't a way to set an overall limit for all mbuf memory together as UMA doesn't support such a limiting. NB: Every cluster also has an mbuf associated with it. Two examples on the revised mbuf sizing limits: 1GB KVM: 512MB limit for mbufs 419,430 mbufs 65,536 2K mbuf clusters 32,768 4K mbuf clusters 9,709 9K mbuf clusters 5,461 16K mbuf clusters 16GB RAM: 8GB limit for mbufs 33,554,432 mbufs 1,048,576 2K mbuf clusters 524,288 4K mbuf clusters 155,344 9K mbuf clusters 87,381 16K mbuf clusters These defaults should be sufficient for even the most demanding network loads. MFC after: 1 month
2012-11-27 21:19:58 +00:00
static int
sysctl_nmbufs(SYSCTL_HANDLER_ARGS)
{
int error, newnmbufs;
newnmbufs = nmbufs;
Style cleanups.
2012-12-07 22:19:41 +00:00
error = sysctl_handle_int(oidp, &newnmbufs, 0, req);
Ignore attempts to set the nmbcluster sysctls to their current value rather than failing with an error. Reviewed by: andre Approved by: re (delphij) MFC after: 2 weeks
2013-10-10 16:11:34 +00:00
if (error == 0 && req->newptr && newnmbufs != nmbufs) {
Base the mbuf related limits on the available physical memory or kernel memory, whichever is lower. The overall mbuf related memory limit must be set so that mbufs (and clusters of various sizes) can't exhaust physical RAM or KVM. The limit is set to half of the physical RAM or KVM (whichever is lower) as the baseline. In any normal scenario we want to leave at least half of the physmem/kvm for other kernel functions and userspace to prevent it from swapping too easily. Via a tunable kern.maxmbufmem the limit can be upped to at most 3/4 of physmem/kvm. At the same time divorce maxfiles from maxusers and set maxfiles to physpages / 8 with a floor based on maxusers. This way busy servers can make use of the significantly increased mbuf limits with a much larger number of open sockets. Tidy up ordering in init_param2() and check up on some users of those values calculated here. Out of the overall mbuf memory limit 2K clusters and 4K (page size) clusters to get 1/4 each because these are the most heavily used mbuf sizes. 2K clusters are used for MTU 1500 ethernet inbound packets. 4K clusters are used whenever possible for sends on sockets and thus outbound packets. The larger cluster sizes of 9K and 16K are limited to 1/6 of the overall mbuf memory limit. When jumbo MTU's are used these large clusters will end up only on the inbound path. They are not used on outbound, there it's still 4K. Yes, that will stay that way because otherwise we run into lots of complications in the stack. And it really isn't a problem, so don't make a scene. Normal mbufs (256B) weren't limited at all previously. This was problematic as there are certain places in the kernel that on allocation failure of clusters try to piece together their packet from smaller mbufs. The mbuf limit is the number of all other mbuf sizes together plus some more to allow for standalone mbufs (ACK for example) and to send off a copy of a cluster. Unfortunately there isn't a way to set an overall limit for all mbuf memory together as UMA doesn't support such a limiting. NB: Every cluster also has an mbuf associated with it. Two examples on the revised mbuf sizing limits: 1GB KVM: 512MB limit for mbufs 419,430 mbufs 65,536 2K mbuf clusters 32,768 4K mbuf clusters 9,709 9K mbuf clusters 5,461 16K mbuf clusters 16GB RAM: 8GB limit for mbufs 33,554,432 mbufs 1,048,576 2K mbuf clusters 524,288 4K mbuf clusters 155,344 9K mbuf clusters 87,381 16K mbuf clusters These defaults should be sufficient for even the most demanding network loads. MFC after: 1 month
2012-11-27 21:19:58 +00:00
if (newnmbufs > nmbufs) {
nmbufs = newnmbufs;
Make use of the fact that uma_zone_set_max(9) already returns the rounded limit making a call to uma_zone_get_max(9) unnecessary. MFC after: 1 day
2013-07-11 12:53:13 +00:00
nmbufs = uma_zone_set_max(zone_mbuf, nmbufs);
Base the mbuf related limits on the available physical memory or kernel memory, whichever is lower. The overall mbuf related memory limit must be set so that mbufs (and clusters of various sizes) can't exhaust physical RAM or KVM. The limit is set to half of the physical RAM or KVM (whichever is lower) as the baseline. In any normal scenario we want to leave at least half of the physmem/kvm for other kernel functions and userspace to prevent it from swapping too easily. Via a tunable kern.maxmbufmem the limit can be upped to at most 3/4 of physmem/kvm. At the same time divorce maxfiles from maxusers and set maxfiles to physpages / 8 with a floor based on maxusers. This way busy servers can make use of the significantly increased mbuf limits with a much larger number of open sockets. Tidy up ordering in init_param2() and check up on some users of those values calculated here. Out of the overall mbuf memory limit 2K clusters and 4K (page size) clusters to get 1/4 each because these are the most heavily used mbuf sizes. 2K clusters are used for MTU 1500 ethernet inbound packets. 4K clusters are used whenever possible for sends on sockets and thus outbound packets. The larger cluster sizes of 9K and 16K are limited to 1/6 of the overall mbuf memory limit. When jumbo MTU's are used these large clusters will end up only on the inbound path. They are not used on outbound, there it's still 4K. Yes, that will stay that way because otherwise we run into lots of complications in the stack. And it really isn't a problem, so don't make a scene. Normal mbufs (256B) weren't limited at all previously. This was problematic as there are certain places in the kernel that on allocation failure of clusters try to piece together their packet from smaller mbufs. The mbuf limit is the number of all other mbuf sizes together plus some more to allow for standalone mbufs (ACK for example) and to send off a copy of a cluster. Unfortunately there isn't a way to set an overall limit for all mbuf memory together as UMA doesn't support such a limiting. NB: Every cluster also has an mbuf associated with it. Two examples on the revised mbuf sizing limits: 1GB KVM: 512MB limit for mbufs 419,430 mbufs 65,536 2K mbuf clusters 32,768 4K mbuf clusters 9,709 9K mbuf clusters 5,461 16K mbuf clusters 16GB RAM: 8GB limit for mbufs 33,554,432 mbufs 1,048,576 2K mbuf clusters 524,288 4K mbuf clusters 155,344 9K mbuf clusters 87,381 16K mbuf clusters These defaults should be sufficient for even the most demanding network loads. MFC after: 1 month
2012-11-27 21:19:58 +00:00
EVENTHANDLER_INVOKE(nmbufs_change);
} else
error = EINVAL;
}
return (error);
}
Mark more nodes as CTLFLAG_MPSAFE or CTLFLAG_NEEDGIANT (17 of many) r357614 added CTLFLAG_NEEDGIANT to make it easier to find nodes that are still not MPSAFE (or already are but aren’t properly marked). Use it in preparation for a general review of all nodes. This is non-functional change that adds annotations to SYSCTL_NODE and SYSCTL_PROC nodes using one of the soon-to-be-required flags. Mark all obvious cases as MPSAFE. All entries that haven't been marked as MPSAFE before are by default marked as NEEDGIANT Approved by: kib (mentor, blanket) Commented by: kib, gallatin, melifaro Differential Revision: https://reviews.freebsd.org/D23718
2020-02-26 14:26:36 +00:00
SYSCTL_PROC(_kern_ipc, OID_AUTO, nmbufs,
CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_NEEDGIANT,
&nmbufs, 0, sysctl_nmbufs, "IU",
Base the mbuf related limits on the available physical memory or kernel memory, whichever is lower. The overall mbuf related memory limit must be set so that mbufs (and clusters of various sizes) can't exhaust physical RAM or KVM. The limit is set to half of the physical RAM or KVM (whichever is lower) as the baseline. In any normal scenario we want to leave at least half of the physmem/kvm for other kernel functions and userspace to prevent it from swapping too easily. Via a tunable kern.maxmbufmem the limit can be upped to at most 3/4 of physmem/kvm. At the same time divorce maxfiles from maxusers and set maxfiles to physpages / 8 with a floor based on maxusers. This way busy servers can make use of the significantly increased mbuf limits with a much larger number of open sockets. Tidy up ordering in init_param2() and check up on some users of those values calculated here. Out of the overall mbuf memory limit 2K clusters and 4K (page size) clusters to get 1/4 each because these are the most heavily used mbuf sizes. 2K clusters are used for MTU 1500 ethernet inbound packets. 4K clusters are used whenever possible for sends on sockets and thus outbound packets. The larger cluster sizes of 9K and 16K are limited to 1/6 of the overall mbuf memory limit. When jumbo MTU's are used these large clusters will end up only on the inbound path. They are not used on outbound, there it's still 4K. Yes, that will stay that way because otherwise we run into lots of complications in the stack. And it really isn't a problem, so don't make a scene. Normal mbufs (256B) weren't limited at all previously. This was problematic as there are certain places in the kernel that on allocation failure of clusters try to piece together their packet from smaller mbufs. The mbuf limit is the number of all other mbuf sizes together plus some more to allow for standalone mbufs (ACK for example) and to send off a copy of a cluster. Unfortunately there isn't a way to set an overall limit for all mbuf memory together as UMA doesn't support such a limiting. NB: Every cluster also has an mbuf associated with it. Two examples on the revised mbuf sizing limits: 1GB KVM: 512MB limit for mbufs 419,430 mbufs 65,536 2K mbuf clusters 32,768 4K mbuf clusters 9,709 9K mbuf clusters 5,461 16K mbuf clusters 16GB RAM: 8GB limit for mbufs 33,554,432 mbufs 1,048,576 2K mbuf clusters 524,288 4K mbuf clusters 155,344 9K mbuf clusters 87,381 16K mbuf clusters These defaults should be sufficient for even the most demanding network loads. MFC after: 1 month
2012-11-27 21:19:58 +00:00
"Maximum number of mbufs allowed");
- Puts default limits on 4k/9k and 16k zones for mbufs all based on 1/2 of each of the successive limits tied to the limit for 2k clusters. - Adds real functionality in so that doing a sysctl to change these actually changes them :-) MFC after: 1 week
2007-12-05 15:29:44 +00:00
Bring in mbuma to replace mballoc. mbuma is an Mbuf & Cluster allocator built on top of a number of extensions to the UMA framework, all included herein. Extensions to UMA worth noting: - Better layering between slab <-> zone caches; introduce Keg structure which splits off slab cache away from the zone structure and allows multiple zones to be stacked on top of a single Keg (single type of slab cache); perhaps we should look into defining a subset API on top of the Keg for special use by malloc(9), for example. - UMA_ZONE_REFCNT zones can now be added, and reference counters automagically allocated for them within the end of the associated slab structures. uma_find_refcnt() does a kextract to fetch the slab struct reference from the underlying page, and lookup the corresponding refcnt. mbuma things worth noting: - integrates mbuf & cluster allocations with extended UMA and provides caches for commonly-allocated items; defines several zones (two primary, one secondary) and two kegs. - change up certain code paths that always used to do: m_get() + m_clget() to instead just use m_getcl() and try to take advantage of the newly defined secondary Packet zone. - netstat(1) and systat(1) quickly hacked up to do basic stat reporting but additional stats work needs to be done once some other details within UMA have been taken care of and it becomes clearer to how stats will work within the modified framework. From the user perspective, one implication is that the NMBCLUSTERS compile-time option is no longer used. The maximum number of clusters is still capped off according to maxusers, but it can be made unlimited by setting the kern.ipc.nmbclusters boot-time tunable to zero. Work should be done to write an appropriate sysctl handler allowing dynamic tuning of kern.ipc.nmbclusters at runtime. Additional things worth noting/known issues (READ): - One report of 'ips' (ServeRAID) driver acting really slow in conjunction with mbuma. Need more data. Latest report is that ips is equally sucking with and without mbuma. - Giant leak in NFS code sometimes occurs, can't reproduce but currently analyzing; brueffer is able to reproduce but THIS IS NOT an mbuma-specific problem and currently occurs even WITHOUT mbuma. - Issues in network locking: there is at least one code path in the rip code where one or more locks are acquired and we end up in m_prepend() with M_WAITOK, which causes WITNESS to whine from within UMA. Current temporary solution: force all UMA allocations to be M_NOWAIT from within UMA for now to avoid deadlocks unless WITNESS is defined and we can determine with certainty that we're not holding any locks when we're M_WAITOK. - I've seen at least one weird socketbuffer empty-but- mbuf-still-attached panic. I don't believe this to be related to mbuma but please keep your eyes open, turn on debugging, and capture crash dumps. This change removes more code than it adds. A paper is available detailing the change and considering various performance issues, it was presented at BSDCan2004: http://www.unixdaemons.com/~bmilekic/netbuf_bmilekic.pdf Please read the paper for Future Work and implementation details, as well as credits. Testing and Debugging: rwatson, brueffer, Ketrien I. Saihr-Kesenchedra, ... Reviewed by: Lots of people (for different parts)
2004-05-31 21:46:06 +00:00
/*
* Zones from which we allocate.
*/
uma_zone_t zone_mbuf;
uma_zone_t zone_clust;
uma_zone_t zone_pack;
Replace the 4k fixed sized jumbo mbuf clusters with PAGE_SIZE sized jumbo mbuf clusters. To make the variable size clear they are named MJUMPAGESIZE. Having jumbo clusters with the native PAGE_SIZE is more useful than a fixed 4k size according the device driver writers using this API. The 9k and 16k jumbo mbuf clusters remain unchanged. Requested by: glebius, gallatin Sponsored by: TCP/IP Optimization Fundraise 2005 MFC after: 3 days
2006-02-17 14:14:15 +00:00
uma_zone_t zone_jumbop;
Mandatory mbuf cluster reference counting and groundwork for UMA based jumbo 9k and jumbo 16k cluster support. All mbuf's with external storage attached are mandatory reference counted. For clusters and jumbo clusters UMA provides the refcnt storage directly. It does not have to be separatly allocated. Any other type of external storage gets its own refcnt allocated from an UMA mbuf refcnt zone instead of normal kernel malloc. The refcount API MEXT_ADD_REF() and MEXT_REM_REF() is no longer publically accessible. The proper m_* functions have to be used. mb_ctor_clust() and mb_dtor_clust() both handle normal 2K as well as 9k and 16k clusters. Clusters and jumbo clusters may be obtained without attaching it immideatly to an mbuf. This is for high performance cluster allocation in network drivers where mbufs are attached after the cluster has been filled. Tested by: rwatson Sponsored by: TCP/IP Optimizations Fundraise 2005
2005-11-02 16:20:36 +00:00
uma_zone_t zone_jumbo9;
uma_zone_t zone_jumbo16;
Bring in mbuma to replace mballoc. mbuma is an Mbuf & Cluster allocator built on top of a number of extensions to the UMA framework, all included herein. Extensions to UMA worth noting: - Better layering between slab <-> zone caches; introduce Keg structure which splits off slab cache away from the zone structure and allows multiple zones to be stacked on top of a single Keg (single type of slab cache); perhaps we should look into defining a subset API on top of the Keg for special use by malloc(9), for example. - UMA_ZONE_REFCNT zones can now be added, and reference counters automagically allocated for them within the end of the associated slab structures. uma_find_refcnt() does a kextract to fetch the slab struct reference from the underlying page, and lookup the corresponding refcnt. mbuma things worth noting: - integrates mbuf & cluster allocations with extended UMA and provides caches for commonly-allocated items; defines several zones (two primary, one secondary) and two kegs. - change up certain code paths that always used to do: m_get() + m_clget() to instead just use m_getcl() and try to take advantage of the newly defined secondary Packet zone. - netstat(1) and systat(1) quickly hacked up to do basic stat reporting but additional stats work needs to be done once some other details within UMA have been taken care of and it becomes clearer to how stats will work within the modified framework. From the user perspective, one implication is that the NMBCLUSTERS compile-time option is no longer used. The maximum number of clusters is still capped off according to maxusers, but it can be made unlimited by setting the kern.ipc.nmbclusters boot-time tunable to zero. Work should be done to write an appropriate sysctl handler allowing dynamic tuning of kern.ipc.nmbclusters at runtime. Additional things worth noting/known issues (READ): - One report of 'ips' (ServeRAID) driver acting really slow in conjunction with mbuma. Need more data. Latest report is that ips is equally sucking with and without mbuma. - Giant leak in NFS code sometimes occurs, can't reproduce but currently analyzing; brueffer is able to reproduce but THIS IS NOT an mbuma-specific problem and currently occurs even WITHOUT mbuma. - Issues in network locking: there is at least one code path in the rip code where one or more locks are acquired and we end up in m_prepend() with M_WAITOK, which causes WITNESS to whine from within UMA. Current temporary solution: force all UMA allocations to be M_NOWAIT from within UMA for now to avoid deadlocks unless WITNESS is defined and we can determine with certainty that we're not holding any locks when we're M_WAITOK. - I've seen at least one weird socketbuffer empty-but- mbuf-still-attached panic. I don't believe this to be related to mbuma but please keep your eyes open, turn on debugging, and capture crash dumps. This change removes more code than it adds. A paper is available detailing the change and considering various performance issues, it was presented at BSDCan2004: http://www.unixdaemons.com/~bmilekic/netbuf_bmilekic.pdf Please read the paper for Future Work and implementation details, as well as credits. Testing and Debugging: rwatson, brueffer, Ketrien I. Saihr-Kesenchedra, ... Reviewed by: Lots of people (for different parts)
2004-05-31 21:46:06 +00:00
/*
* Local prototypes.
*/
* Add a "how" argument to uma_zone constructors and initialization functions so that they know whether the allocation is supposed to be able to sleep or not. * Allow uma_zone constructors and initialation functions to return either success or error. Almost all of the ones in the tree currently return success unconditionally, but mbuf is a notable exception: the packet zone constructor wants to be able to fail if it cannot suballocate an mbuf cluster, and the mbuf allocators want to be able to fail in general in a MAC kernel if the MAC mbuf initializer fails. This fixes the panics people are seeing when they run out of memory for mbuf clusters. * Allow debug.nosleepwithlocks on WITNESS to be disabled, without changing the default. Both bmilekic and jeff have reviewed the changes made to make failable zone allocations work.
2004-08-02 00:18:36 +00:00
static int mb_ctor_mbuf(void *, int, void *, int);
static int mb_ctor_clust(void *, int, void *, int);
static int mb_ctor_pack(void *, int, void *, int);
Bring in mbuma to replace mballoc. mbuma is an Mbuf & Cluster allocator built on top of a number of extensions to the UMA framework, all included herein. Extensions to UMA worth noting: - Better layering between slab <-> zone caches; introduce Keg structure which splits off slab cache away from the zone structure and allows multiple zones to be stacked on top of a single Keg (single type of slab cache); perhaps we should look into defining a subset API on top of the Keg for special use by malloc(9), for example. - UMA_ZONE_REFCNT zones can now be added, and reference counters automagically allocated for them within the end of the associated slab structures. uma_find_refcnt() does a kextract to fetch the slab struct reference from the underlying page, and lookup the corresponding refcnt. mbuma things worth noting: - integrates mbuf & cluster allocations with extended UMA and provides caches for commonly-allocated items; defines several zones (two primary, one secondary) and two kegs. - change up certain code paths that always used to do: m_get() + m_clget() to instead just use m_getcl() and try to take advantage of the newly defined secondary Packet zone. - netstat(1) and systat(1) quickly hacked up to do basic stat reporting but additional stats work needs to be done once some other details within UMA have been taken care of and it becomes clearer to how stats will work within the modified framework. From the user perspective, one implication is that the NMBCLUSTERS compile-time option is no longer used. The maximum number of clusters is still capped off according to maxusers, but it can be made unlimited by setting the kern.ipc.nmbclusters boot-time tunable to zero. Work should be done to write an appropriate sysctl handler allowing dynamic tuning of kern.ipc.nmbclusters at runtime. Additional things worth noting/known issues (READ): - One report of 'ips' (ServeRAID) driver acting really slow in conjunction with mbuma. Need more data. Latest report is that ips is equally sucking with and without mbuma. - Giant leak in NFS code sometimes occurs, can't reproduce but currently analyzing; brueffer is able to reproduce but THIS IS NOT an mbuma-specific problem and currently occurs even WITHOUT mbuma. - Issues in network locking: there is at least one code path in the rip code where one or more locks are acquired and we end up in m_prepend() with M_WAITOK, which causes WITNESS to whine from within UMA. Current temporary solution: force all UMA allocations to be M_NOWAIT from within UMA for now to avoid deadlocks unless WITNESS is defined and we can determine with certainty that we're not holding any locks when we're M_WAITOK. - I've seen at least one weird socketbuffer empty-but- mbuf-still-attached panic. I don't believe this to be related to mbuma but please keep your eyes open, turn on debugging, and capture crash dumps. This change removes more code than it adds. A paper is available detailing the change and considering various performance issues, it was presented at BSDCan2004: http://www.unixdaemons.com/~bmilekic/netbuf_bmilekic.pdf Please read the paper for Future Work and implementation details, as well as credits. Testing and Debugging: rwatson, brueffer, Ketrien I. Saihr-Kesenchedra, ... Reviewed by: Lots of people (for different parts)
2004-05-31 21:46:06 +00:00
static void mb_dtor_mbuf(void *, int, void *);
Mandatory mbuf cluster reference counting and groundwork for UMA based jumbo 9k and jumbo 16k cluster support. All mbuf's with external storage attached are mandatory reference counted. For clusters and jumbo clusters UMA provides the refcnt storage directly. It does not have to be separatly allocated. Any other type of external storage gets its own refcnt allocated from an UMA mbuf refcnt zone instead of normal kernel malloc. The refcount API MEXT_ADD_REF() and MEXT_REM_REF() is no longer publically accessible. The proper m_* functions have to be used. mb_ctor_clust() and mb_dtor_clust() both handle normal 2K as well as 9k and 16k clusters. Clusters and jumbo clusters may be obtained without attaching it immideatly to an mbuf. This is for high performance cluster allocation in network drivers where mbufs are attached after the cluster has been filled. Tested by: rwatson Sponsored by: TCP/IP Optimizations Fundraise 2005
2005-11-02 16:20:36 +00:00
static void mb_dtor_pack(void *, int, void *);
static int mb_zinit_pack(void *, int, int);
static void mb_zfini_pack(void *, int);
Redo r292484. Embed task(9) into zone, so that uz_maxaction is called in a context that can sleep, allowing consumers of the KPI to run their drain routines without any extra measures. Discussed with: jtl
2016-02-03 23:30:17 +00:00
static void mb_reclaim(uma_zone_t, int);
Bring in mbuma to replace mballoc. mbuma is an Mbuf & Cluster allocator built on top of a number of extensions to the UMA framework, all included herein. Extensions to UMA worth noting: - Better layering between slab <-> zone caches; introduce Keg structure which splits off slab cache away from the zone structure and allows multiple zones to be stacked on top of a single Keg (single type of slab cache); perhaps we should look into defining a subset API on top of the Keg for special use by malloc(9), for example. - UMA_ZONE_REFCNT zones can now be added, and reference counters automagically allocated for them within the end of the associated slab structures. uma_find_refcnt() does a kextract to fetch the slab struct reference from the underlying page, and lookup the corresponding refcnt. mbuma things worth noting: - integrates mbuf & cluster allocations with extended UMA and provides caches for commonly-allocated items; defines several zones (two primary, one secondary) and two kegs. - change up certain code paths that always used to do: m_get() + m_clget() to instead just use m_getcl() and try to take advantage of the newly defined secondary Packet zone. - netstat(1) and systat(1) quickly hacked up to do basic stat reporting but additional stats work needs to be done once some other details within UMA have been taken care of and it becomes clearer to how stats will work within the modified framework. From the user perspective, one implication is that the NMBCLUSTERS compile-time option is no longer used. The maximum number of clusters is still capped off according to maxusers, but it can be made unlimited by setting the kern.ipc.nmbclusters boot-time tunable to zero. Work should be done to write an appropriate sysctl handler allowing dynamic tuning of kern.ipc.nmbclusters at runtime. Additional things worth noting/known issues (READ): - One report of 'ips' (ServeRAID) driver acting really slow in conjunction with mbuma. Need more data. Latest report is that ips is equally sucking with and without mbuma. - Giant leak in NFS code sometimes occurs, can't reproduce but currently analyzing; brueffer is able to reproduce but THIS IS NOT an mbuma-specific problem and currently occurs even WITHOUT mbuma. - Issues in network locking: there is at least one code path in the rip code where one or more locks are acquired and we end up in m_prepend() with M_WAITOK, which causes WITNESS to whine from within UMA. Current temporary solution: force all UMA allocations to be M_NOWAIT from within UMA for now to avoid deadlocks unless WITNESS is defined and we can determine with certainty that we're not holding any locks when we're M_WAITOK. - I've seen at least one weird socketbuffer empty-but- mbuf-still-attached panic. I don't believe this to be related to mbuma but please keep your eyes open, turn on debugging, and capture crash dumps. This change removes more code than it adds. A paper is available detailing the change and considering various performance issues, it was presented at BSDCan2004: http://www.unixdaemons.com/~bmilekic/netbuf_bmilekic.pdf Please read the paper for Future Work and implementation details, as well as credits. Testing and Debugging: rwatson, brueffer, Ketrien I. Saihr-Kesenchedra, ... Reviewed by: Lots of people (for different parts)
2004-05-31 21:46:06 +00:00
Move the mbuf memory limit calculations from init_param2() to tunable_mbinit() where it is next to where it is used later. Change the sysinit level of tunable_mbinit() from SI_SUB_TUNABLES to SI_SUB_KMEM after the VM is running. This allows to use better methods to determine the effectively available physical and virtual memory available to the kernel. Update comments. In a second step it can be merged into mbuf_init().
2013-01-17 21:28:31 +00:00
/* Ensure that MSIZE is a power of 2. */
CTASSERT that MSZIE is a power of 2 (otherwise dtom() breaks) Ask uma_zcreate() to align mbufs to MSIZE bytes (otherwise dtom() breaks) As it happens, uma_zalloc_arg() always returned mbufs aligned to MSIZE anyway, but that was an implementation side-effect.... KASSERT -> CTASSERT suggested by: dd@ Approved by: silence on -net
2004-09-20 08:52:04 +00:00
CTASSERT((((MSIZE - 1) ^ MSIZE) + 1) >> 1 == MSIZE);
KTLS: Re-work unmapped mbufs to carry ext_pgs in the mbuf itself. While the original implementation of unmapped mbufs was a large step forward in terms of reducing cache misses by enabling mbufs to carry more than a single page for sendfile, they are rather cache unfriendly when accessing the ext_pgs metadata and data. This is because the ext_pgs part of the mbuf is allocated separately, and almost guaranteed to be cold in cache. This change takes advantage of the fact that unmapped mbufs are never used at the same time as pkthdr mbufs. Given this fact, we can overlap the ext_pgs metadata with the mbuf pkthdr, and carry the ext_pgs meta directly in the mbuf itself. Similarly, we can carry the ext_pgs data (TLS hdr/trailer/array of pages) directly after the existing m_ext. In order to be able to carry 5 pages (which is the minimum required for a 16K TLS record which is not perfectly aligned) on LP64, I've had to steal ext_arg2. The only user of this in the xmit path is sendfile, and I've adjusted it to use arg1 when using unmapped mbufs. This change is almost entirely mechanical, except that we change mb_alloc_ext_pgs() to no longer allow allocating pkthdrs, the change to avoid ext_arg2 as mentioned above, and the removal of the ext_pgs zone, This change saves roughly 2% "raw" CPU (~59% -> 57%), or over 3% "scaled" CPU on a Netflix 100% software kTLS workload at 90+ Gb/s on Broadwell Xeons. In a follow-on commit, I plan to remove some hacks to avoid access ext_pgs fields of mbufs, since they will now be in cache. Many thanks to glebius for helping to make this better in the Netflix tree. Reviewed by: hselasky, jhb, rrs, glebius (early version) Sponsored by: Netflix Differential Revision: https://reviews.freebsd.org/D24213
2020-04-14 14:46:06 +00:00
_Static_assert(sizeof(struct mbuf) <= MSIZE,
"size of mbuf exceeds MSIZE");
Bring in mbuma to replace mballoc. mbuma is an Mbuf & Cluster allocator built on top of a number of extensions to the UMA framework, all included herein. Extensions to UMA worth noting: - Better layering between slab <-> zone caches; introduce Keg structure which splits off slab cache away from the zone structure and allows multiple zones to be stacked on top of a single Keg (single type of slab cache); perhaps we should look into defining a subset API on top of the Keg for special use by malloc(9), for example. - UMA_ZONE_REFCNT zones can now be added, and reference counters automagically allocated for them within the end of the associated slab structures. uma_find_refcnt() does a kextract to fetch the slab struct reference from the underlying page, and lookup the corresponding refcnt. mbuma things worth noting: - integrates mbuf & cluster allocations with extended UMA and provides caches for commonly-allocated items; defines several zones (two primary, one secondary) and two kegs. - change up certain code paths that always used to do: m_get() + m_clget() to instead just use m_getcl() and try to take advantage of the newly defined secondary Packet zone. - netstat(1) and systat(1) quickly hacked up to do basic stat reporting but additional stats work needs to be done once some other details within UMA have been taken care of and it becomes clearer to how stats will work within the modified framework. From the user perspective, one implication is that the NMBCLUSTERS compile-time option is no longer used. The maximum number of clusters is still capped off according to maxusers, but it can be made unlimited by setting the kern.ipc.nmbclusters boot-time tunable to zero. Work should be done to write an appropriate sysctl handler allowing dynamic tuning of kern.ipc.nmbclusters at runtime. Additional things worth noting/known issues (READ): - One report of 'ips' (ServeRAID) driver acting really slow in conjunction with mbuma. Need more data. Latest report is that ips is equally sucking with and without mbuma. - Giant leak in NFS code sometimes occurs, can't reproduce but currently analyzing; brueffer is able to reproduce but THIS IS NOT an mbuma-specific problem and currently occurs even WITHOUT mbuma. - Issues in network locking: there is at least one code path in the rip code where one or more locks are acquired and we end up in m_prepend() with M_WAITOK, which causes WITNESS to whine from within UMA. Current temporary solution: force all UMA allocations to be M_NOWAIT from within UMA for now to avoid deadlocks unless WITNESS is defined and we can determine with certainty that we're not holding any locks when we're M_WAITOK. - I've seen at least one weird socketbuffer empty-but- mbuf-still-attached panic. I don't believe this to be related to mbuma but please keep your eyes open, turn on debugging, and capture crash dumps. This change removes more code than it adds. A paper is available detailing the change and considering various performance issues, it was presented at BSDCan2004: http://www.unixdaemons.com/~bmilekic/netbuf_bmilekic.pdf Please read the paper for Future Work and implementation details, as well as credits. Testing and Debugging: rwatson, brueffer, Ketrien I. Saihr-Kesenchedra, ... Reviewed by: Lots of people (for different parts)
2004-05-31 21:46:06 +00:00
/*
* Initialize FreeBSD Network buffer allocation.
*/
static void
mbuf_init(void *dummy)
{
/*
* Configure UMA zones for Mbufs, Clusters, and Packets.
*/
Mandatory mbuf cluster reference counting and groundwork for UMA based jumbo 9k and jumbo 16k cluster support. All mbuf's with external storage attached are mandatory reference counted. For clusters and jumbo clusters UMA provides the refcnt storage directly. It does not have to be separatly allocated. Any other type of external storage gets its own refcnt allocated from an UMA mbuf refcnt zone instead of normal kernel malloc. The refcount API MEXT_ADD_REF() and MEXT_REM_REF() is no longer publically accessible. The proper m_* functions have to be used. mb_ctor_clust() and mb_dtor_clust() both handle normal 2K as well as 9k and 16k clusters. Clusters and jumbo clusters may be obtained without attaching it immideatly to an mbuf. This is for high performance cluster allocation in network drivers where mbufs are attached after the cluster has been filled. Tested by: rwatson Sponsored by: TCP/IP Optimizations Fundraise 2005
2005-11-02 16:20:36 +00:00
zone_mbuf = uma_zcreate(MBUF_MEM_NAME, MSIZE,
mbuf zones: take out the trash The mbuf zones were explicitly specifying the uma trash procedures on zcreate, conditionally on INVARIANTS, because that used to be necessary in order to get use-after-free checking for uma zones with non-empty constructors or destructors. After r355137 uma automatically invokes the trash constructor and destructor as long as no init and fini are specified. This now allows the mbuf zones to pass their constructors and destructors without needing to add on the uma trash procedures conditionally. Reviewed by: cem, jhb, markj Sponsored by: Dell EMC Isilon Differential Revision: https://reviews.freebsd.org/D22583
2019-12-04 18:21:29 +00:00
mb_ctor_mbuf, mb_dtor_mbuf, NULL, NULL,
uma: convert mbuf_jumbo_alloc to UMA_ZONE_CONTIG & tag others Remove mbuf_jumbo_alloc and let large mbuf zones use the new uma default contig allocator (a copy of mbuf_jumbo_alloc). Tag other zones which require contiguous objects, even if they don't use the new default contig allocator, so that uma knows about their constraints. Reviewed by: jeff, markj Sponsored by: Dell EMC Isilon Differential Revision: https://reviews.freebsd.org/D23238
2020-02-04 22:40:23 +00:00
MSIZE - 1, UMA_ZONE_CONTIG | UMA_ZONE_MAXBUCKET);
Make use of the fact that uma_zone_set_max(9) already returns actual limit set.
2012-12-07 22:23:53 +00:00
if (nmbufs > 0)
nmbufs = uma_zone_set_max(zone_mbuf, nmbufs);
Configure UMA warnings for the following zones: - unp_zone: kern.ipc.maxsockets limit reached - socket_zone: kern.ipc.maxsockets limit reached - zone_mbuf: kern.ipc.nmbufs limit reached - zone_clust: kern.ipc.nmbclusters limit reached - zone_jumbop: kern.ipc.nmbjumbop limit reached - zone_jumbo9: kern.ipc.nmbjumbo9 limit reached - zone_jumbo16: kern.ipc.nmbjumbo16 limit reached Note that those warnings are printed not often than every five minutes and can be globally turned off by setting sysctl/tunable vm.zone_warnings to 0. Discussed on: arch Obtained from: WHEEL Systems MFC after: 2 weeks
2012-12-07 22:30:30 +00:00
uma_zone_set_warning(zone_mbuf, "kern.ipc.nmbufs limit reached");
Redo r292484. Embed task(9) into zone, so that uz_maxaction is called in a context that can sleep, allowing consumers of the KPI to run their drain routines without any extra measures. Discussed with: jtl
2016-02-03 23:30:17 +00:00
uma_zone_set_maxaction(zone_mbuf, mb_reclaim);
Mandatory mbuf cluster reference counting and groundwork for UMA based jumbo 9k and jumbo 16k cluster support. All mbuf's with external storage attached are mandatory reference counted. For clusters and jumbo clusters UMA provides the refcnt storage directly. It does not have to be separatly allocated. Any other type of external storage gets its own refcnt allocated from an UMA mbuf refcnt zone instead of normal kernel malloc. The refcount API MEXT_ADD_REF() and MEXT_REM_REF() is no longer publically accessible. The proper m_* functions have to be used. mb_ctor_clust() and mb_dtor_clust() both handle normal 2K as well as 9k and 16k clusters. Clusters and jumbo clusters may be obtained without attaching it immideatly to an mbuf. This is for high performance cluster allocation in network drivers where mbufs are attached after the cluster has been filled. Tested by: rwatson Sponsored by: TCP/IP Optimizations Fundraise 2005
2005-11-02 16:20:36 +00:00
Define four constants, MBUF_{,MEM,CLUSTER,PACKET,TAG}_MEM_NAME, which are string names for their respective UMA zones and malloc types, and are passed into uma_zcreate() and MALLOC_DEFINE(). Export them outside of _KERNEL in mbuf.h so that netstat can reference them. Change the names to improve consistency, with each zone/type associated with the mbuf allocator being prefixed mbuf_. MFC after: 1 week
2005-07-17 14:04:03 +00:00
zone_clust = uma_zcreate(MBUF_CLUSTER_MEM_NAME, MCLBYTES,
mbuf zones: take out the trash The mbuf zones were explicitly specifying the uma trash procedures on zcreate, conditionally on INVARIANTS, because that used to be necessary in order to get use-after-free checking for uma zones with non-empty constructors or destructors. After r355137 uma automatically invokes the trash constructor and destructor as long as no init and fini are specified. This now allows the mbuf zones to pass their constructors and destructors without needing to add on the uma trash procedures conditionally. Reviewed by: cem, jhb, markj Sponsored by: Dell EMC Isilon Differential Revision: https://reviews.freebsd.org/D22583
2019-12-04 18:21:29 +00:00
mb_ctor_clust, NULL, NULL, NULL,
uma: convert mbuf_jumbo_alloc to UMA_ZONE_CONTIG & tag others Remove mbuf_jumbo_alloc and let large mbuf zones use the new uma default contig allocator (a copy of mbuf_jumbo_alloc). Tag other zones which require contiguous objects, even if they don't use the new default contig allocator, so that uma knows about their constraints. Reviewed by: jeff, markj Sponsored by: Dell EMC Isilon Differential Revision: https://reviews.freebsd.org/D23238
2020-02-04 22:40:23 +00:00
UMA_ALIGN_PTR, UMA_ZONE_CONTIG);
Make use of the fact that uma_zone_set_max(9) already returns actual limit set.
2012-12-07 22:23:53 +00:00
if (nmbclusters > 0)
nmbclusters = uma_zone_set_max(zone_clust, nmbclusters);
Configure UMA warnings for the following zones: - unp_zone: kern.ipc.maxsockets limit reached - socket_zone: kern.ipc.maxsockets limit reached - zone_mbuf: kern.ipc.nmbufs limit reached - zone_clust: kern.ipc.nmbclusters limit reached - zone_jumbop: kern.ipc.nmbjumbop limit reached - zone_jumbo9: kern.ipc.nmbjumbo9 limit reached - zone_jumbo16: kern.ipc.nmbjumbo16 limit reached Note that those warnings are printed not often than every five minutes and can be globally turned off by setting sysctl/tunable vm.zone_warnings to 0. Discussed on: arch Obtained from: WHEEL Systems MFC after: 2 weeks
2012-12-07 22:30:30 +00:00
uma_zone_set_warning(zone_clust, "kern.ipc.nmbclusters limit reached");
Redo r292484. Embed task(9) into zone, so that uz_maxaction is called in a context that can sleep, allowing consumers of the KPI to run their drain routines without any extra measures. Discussed with: jtl
2016-02-03 23:30:17 +00:00
uma_zone_set_maxaction(zone_clust, mb_reclaim);
Mandatory mbuf cluster reference counting and groundwork for UMA based jumbo 9k and jumbo 16k cluster support. All mbuf's with external storage attached are mandatory reference counted. For clusters and jumbo clusters UMA provides the refcnt storage directly. It does not have to be separatly allocated. Any other type of external storage gets its own refcnt allocated from an UMA mbuf refcnt zone instead of normal kernel malloc. The refcount API MEXT_ADD_REF() and MEXT_REM_REF() is no longer publically accessible. The proper m_* functions have to be used. mb_ctor_clust() and mb_dtor_clust() both handle normal 2K as well as 9k and 16k clusters. Clusters and jumbo clusters may be obtained without attaching it immideatly to an mbuf. This is for high performance cluster allocation in network drivers where mbufs are attached after the cluster has been filled. Tested by: rwatson Sponsored by: TCP/IP Optimizations Fundraise 2005
2005-11-02 16:20:36 +00:00
Define four constants, MBUF_{,MEM,CLUSTER,PACKET,TAG}_MEM_NAME, which are string names for their respective UMA zones and malloc types, and are passed into uma_zcreate() and MALLOC_DEFINE(). Export them outside of _KERNEL in mbuf.h so that netstat can reference them. Change the names to improve consistency, with each zone/type associated with the mbuf allocator being prefixed mbuf_. MFC after: 1 week
2005-07-17 14:04:03 +00:00
zone_pack = uma_zsecond_create(MBUF_PACKET_MEM_NAME, mb_ctor_pack,
Mandatory mbuf cluster reference counting and groundwork for UMA based jumbo 9k and jumbo 16k cluster support. All mbuf's with external storage attached are mandatory reference counted. For clusters and jumbo clusters UMA provides the refcnt storage directly. It does not have to be separatly allocated. Any other type of external storage gets its own refcnt allocated from an UMA mbuf refcnt zone instead of normal kernel malloc. The refcount API MEXT_ADD_REF() and MEXT_REM_REF() is no longer publically accessible. The proper m_* functions have to be used. mb_ctor_clust() and mb_dtor_clust() both handle normal 2K as well as 9k and 16k clusters. Clusters and jumbo clusters may be obtained without attaching it immideatly to an mbuf. This is for high performance cluster allocation in network drivers where mbufs are attached after the cluster has been filled. Tested by: rwatson Sponsored by: TCP/IP Optimizations Fundraise 2005
2005-11-02 16:20:36 +00:00
mb_dtor_pack, mb_zinit_pack, mb_zfini_pack, zone_mbuf);
Fix several typos and trim spaces at eol. PR: kern/93759 Submitted by: Antoine Brodin <antoine.brodin laposte.net>
2006-02-26 11:44:28 +00:00
/* Make jumbo frame zone too. Page size, 9k and 16k. */
Replace the 4k fixed sized jumbo mbuf clusters with PAGE_SIZE sized jumbo mbuf clusters. To make the variable size clear they are named MJUMPAGESIZE. Having jumbo clusters with the native PAGE_SIZE is more useful than a fixed 4k size according the device driver writers using this API. The 9k and 16k jumbo mbuf clusters remain unchanged. Requested by: glebius, gallatin Sponsored by: TCP/IP Optimization Fundraise 2005 MFC after: 3 days
2006-02-17 14:14:15 +00:00
zone_jumbop = uma_zcreate(MBUF_JUMBOP_MEM_NAME, MJUMPAGESIZE,
mbuf zones: take out the trash The mbuf zones were explicitly specifying the uma trash procedures on zcreate, conditionally on INVARIANTS, because that used to be necessary in order to get use-after-free checking for uma zones with non-empty constructors or destructors. After r355137 uma automatically invokes the trash constructor and destructor as long as no init and fini are specified. This now allows the mbuf zones to pass their constructors and destructors without needing to add on the uma trash procedures conditionally. Reviewed by: cem, jhb, markj Sponsored by: Dell EMC Isilon Differential Revision: https://reviews.freebsd.org/D22583
2019-12-04 18:21:29 +00:00
mb_ctor_clust, NULL, NULL, NULL,
uma: convert mbuf_jumbo_alloc to UMA_ZONE_CONTIG & tag others Remove mbuf_jumbo_alloc and let large mbuf zones use the new uma default contig allocator (a copy of mbuf_jumbo_alloc). Tag other zones which require contiguous objects, even if they don't use the new default contig allocator, so that uma knows about their constraints. Reviewed by: jeff, markj Sponsored by: Dell EMC Isilon Differential Revision: https://reviews.freebsd.org/D23238
2020-02-04 22:40:23 +00:00
UMA_ALIGN_PTR, UMA_ZONE_CONTIG);
Make use of the fact that uma_zone_set_max(9) already returns actual limit set.
2012-12-07 22:23:53 +00:00
if (nmbjumbop > 0)
nmbjumbop = uma_zone_set_max(zone_jumbop, nmbjumbop);
Configure UMA warnings for the following zones: - unp_zone: kern.ipc.maxsockets limit reached - socket_zone: kern.ipc.maxsockets limit reached - zone_mbuf: kern.ipc.nmbufs limit reached - zone_clust: kern.ipc.nmbclusters limit reached - zone_jumbop: kern.ipc.nmbjumbop limit reached - zone_jumbo9: kern.ipc.nmbjumbo9 limit reached - zone_jumbo16: kern.ipc.nmbjumbo16 limit reached Note that those warnings are printed not often than every five minutes and can be globally turned off by setting sysctl/tunable vm.zone_warnings to 0. Discussed on: arch Obtained from: WHEEL Systems MFC after: 2 weeks
2012-12-07 22:30:30 +00:00
uma_zone_set_warning(zone_jumbop, "kern.ipc.nmbjumbop limit reached");
Redo r292484. Embed task(9) into zone, so that uz_maxaction is called in a context that can sleep, allowing consumers of the KPI to run their drain routines without any extra measures. Discussed with: jtl
2016-02-03 23:30:17 +00:00
uma_zone_set_maxaction(zone_jumbop, mb_reclaim);
Add an API for jumbo mbuf cluster allocation and also provide 4k clusters in addition to 9k and 16k ones. struct mbuf *m_getjcl(int how, short type, int flags, int size) void *m_cljget(struct mbuf *m, int how, int size) m_getjcl() returns an mbuf with a cluster of the specified size attached like m_getcl() does for 2k clusters. m_cljget() is different from m_clget() as it can allocate clusters without attaching them to an mbuf. In that case the return value is the pointer to the cluster of the requested size. If an mbuf was specified, it gets the cluster attached to it and the return value can be safely ignored. For size both take MCLBYTES, MJUM4BYTES, MJUM9BYTES, MJUM16BYTES. Reviewed by: glebius Tested by: glebius Sponsored by: TCP/IP Optimization Fundraise 2005
2005-12-08 13:13:06 +00:00
Mandatory mbuf cluster reference counting and groundwork for UMA based jumbo 9k and jumbo 16k cluster support. All mbuf's with external storage attached are mandatory reference counted. For clusters and jumbo clusters UMA provides the refcnt storage directly. It does not have to be separatly allocated. Any other type of external storage gets its own refcnt allocated from an UMA mbuf refcnt zone instead of normal kernel malloc. The refcount API MEXT_ADD_REF() and MEXT_REM_REF() is no longer publically accessible. The proper m_* functions have to be used. mb_ctor_clust() and mb_dtor_clust() both handle normal 2K as well as 9k and 16k clusters. Clusters and jumbo clusters may be obtained without attaching it immideatly to an mbuf. This is for high performance cluster allocation in network drivers where mbufs are attached after the cluster has been filled. Tested by: rwatson Sponsored by: TCP/IP Optimizations Fundraise 2005
2005-11-02 16:20:36 +00:00
zone_jumbo9 = uma_zcreate(MBUF_JUMBO9_MEM_NAME, MJUM9BYTES,
mbuf zones: take out the trash The mbuf zones were explicitly specifying the uma trash procedures on zcreate, conditionally on INVARIANTS, because that used to be necessary in order to get use-after-free checking for uma zones with non-empty constructors or destructors. After r355137 uma automatically invokes the trash constructor and destructor as long as no init and fini are specified. This now allows the mbuf zones to pass their constructors and destructors without needing to add on the uma trash procedures conditionally. Reviewed by: cem, jhb, markj Sponsored by: Dell EMC Isilon Differential Revision: https://reviews.freebsd.org/D22583
2019-12-04 18:21:29 +00:00
mb_ctor_clust, NULL, NULL, NULL,
uma: convert mbuf_jumbo_alloc to UMA_ZONE_CONTIG & tag others Remove mbuf_jumbo_alloc and let large mbuf zones use the new uma default contig allocator (a copy of mbuf_jumbo_alloc). Tag other zones which require contiguous objects, even if they don't use the new default contig allocator, so that uma knows about their constraints. Reviewed by: jeff, markj Sponsored by: Dell EMC Isilon Differential Revision: https://reviews.freebsd.org/D23238
2020-02-04 22:40:23 +00:00
UMA_ALIGN_PTR, UMA_ZONE_CONTIG);
Make use of the fact that uma_zone_set_max(9) already returns actual limit set.
2012-12-07 22:23:53 +00:00
if (nmbjumbo9 > 0)
nmbjumbo9 = uma_zone_set_max(zone_jumbo9, nmbjumbo9);
Configure UMA warnings for the following zones: - unp_zone: kern.ipc.maxsockets limit reached - socket_zone: kern.ipc.maxsockets limit reached - zone_mbuf: kern.ipc.nmbufs limit reached - zone_clust: kern.ipc.nmbclusters limit reached - zone_jumbop: kern.ipc.nmbjumbop limit reached - zone_jumbo9: kern.ipc.nmbjumbo9 limit reached - zone_jumbo16: kern.ipc.nmbjumbo16 limit reached Note that those warnings are printed not often than every five minutes and can be globally turned off by setting sysctl/tunable vm.zone_warnings to 0. Discussed on: arch Obtained from: WHEEL Systems MFC after: 2 weeks
2012-12-07 22:30:30 +00:00
uma_zone_set_warning(zone_jumbo9, "kern.ipc.nmbjumbo9 limit reached");
Redo r292484. Embed task(9) into zone, so that uz_maxaction is called in a context that can sleep, allowing consumers of the KPI to run their drain routines without any extra measures. Discussed with: jtl
2016-02-03 23:30:17 +00:00
uma_zone_set_maxaction(zone_jumbo9, mb_reclaim);
Mandatory mbuf cluster reference counting and groundwork for UMA based jumbo 9k and jumbo 16k cluster support. All mbuf's with external storage attached are mandatory reference counted. For clusters and jumbo clusters UMA provides the refcnt storage directly. It does not have to be separatly allocated. Any other type of external storage gets its own refcnt allocated from an UMA mbuf refcnt zone instead of normal kernel malloc. The refcount API MEXT_ADD_REF() and MEXT_REM_REF() is no longer publically accessible. The proper m_* functions have to be used. mb_ctor_clust() and mb_dtor_clust() both handle normal 2K as well as 9k and 16k clusters. Clusters and jumbo clusters may be obtained without attaching it immideatly to an mbuf. This is for high performance cluster allocation in network drivers where mbufs are attached after the cluster has been filled. Tested by: rwatson Sponsored by: TCP/IP Optimizations Fundraise 2005
2005-11-02 16:20:36 +00:00
zone_jumbo16 = uma_zcreate(MBUF_JUMBO16_MEM_NAME, MJUM16BYTES,
mbuf zones: take out the trash The mbuf zones were explicitly specifying the uma trash procedures on zcreate, conditionally on INVARIANTS, because that used to be necessary in order to get use-after-free checking for uma zones with non-empty constructors or destructors. After r355137 uma automatically invokes the trash constructor and destructor as long as no init and fini are specified. This now allows the mbuf zones to pass their constructors and destructors without needing to add on the uma trash procedures conditionally. Reviewed by: cem, jhb, markj Sponsored by: Dell EMC Isilon Differential Revision: https://reviews.freebsd.org/D22583
2019-12-04 18:21:29 +00:00
mb_ctor_clust, NULL, NULL, NULL,
uma: convert mbuf_jumbo_alloc to UMA_ZONE_CONTIG & tag others Remove mbuf_jumbo_alloc and let large mbuf zones use the new uma default contig allocator (a copy of mbuf_jumbo_alloc). Tag other zones which require contiguous objects, even if they don't use the new default contig allocator, so that uma knows about their constraints. Reviewed by: jeff, markj Sponsored by: Dell EMC Isilon Differential Revision: https://reviews.freebsd.org/D23238
2020-02-04 22:40:23 +00:00
UMA_ALIGN_PTR, UMA_ZONE_CONTIG);
Make use of the fact that uma_zone_set_max(9) already returns actual limit set.
2012-12-07 22:23:53 +00:00
if (nmbjumbo16 > 0)
nmbjumbo16 = uma_zone_set_max(zone_jumbo16, nmbjumbo16);
Configure UMA warnings for the following zones: - unp_zone: kern.ipc.maxsockets limit reached - socket_zone: kern.ipc.maxsockets limit reached - zone_mbuf: kern.ipc.nmbufs limit reached - zone_clust: kern.ipc.nmbclusters limit reached - zone_jumbop: kern.ipc.nmbjumbop limit reached - zone_jumbo9: kern.ipc.nmbjumbo9 limit reached - zone_jumbo16: kern.ipc.nmbjumbo16 limit reached Note that those warnings are printed not often than every five minutes and can be globally turned off by setting sysctl/tunable vm.zone_warnings to 0. Discussed on: arch Obtained from: WHEEL Systems MFC after: 2 weeks
2012-12-07 22:30:30 +00:00
uma_zone_set_warning(zone_jumbo16, "kern.ipc.nmbjumbo16 limit reached");
Redo r292484. Embed task(9) into zone, so that uz_maxaction is called in a context that can sleep, allowing consumers of the KPI to run their drain routines without any extra measures. Discussed with: jtl
2016-02-03 23:30:17 +00:00
uma_zone_set_maxaction(zone_jumbo16, mb_reclaim);
Bring in mbuma to replace mballoc. mbuma is an Mbuf & Cluster allocator built on top of a number of extensions to the UMA framework, all included herein. Extensions to UMA worth noting: - Better layering between slab <-> zone caches; introduce Keg structure which splits off slab cache away from the zone structure and allows multiple zones to be stacked on top of a single Keg (single type of slab cache); perhaps we should look into defining a subset API on top of the Keg for special use by malloc(9), for example. - UMA_ZONE_REFCNT zones can now be added, and reference counters automagically allocated for them within the end of the associated slab structures. uma_find_refcnt() does a kextract to fetch the slab struct reference from the underlying page, and lookup the corresponding refcnt. mbuma things worth noting: - integrates mbuf & cluster allocations with extended UMA and provides caches for commonly-allocated items; defines several zones (two primary, one secondary) and two kegs. - change up certain code paths that always used to do: m_get() + m_clget() to instead just use m_getcl() and try to take advantage of the newly defined secondary Packet zone. - netstat(1) and systat(1) quickly hacked up to do basic stat reporting but additional stats work needs to be done once some other details within UMA have been taken care of and it becomes clearer to how stats will work within the modified framework. From the user perspective, one implication is that the NMBCLUSTERS compile-time option is no longer used. The maximum number of clusters is still capped off according to maxusers, but it can be made unlimited by setting the kern.ipc.nmbclusters boot-time tunable to zero. Work should be done to write an appropriate sysctl handler allowing dynamic tuning of kern.ipc.nmbclusters at runtime. Additional things worth noting/known issues (READ): - One report of 'ips' (ServeRAID) driver acting really slow in conjunction with mbuma. Need more data. Latest report is that ips is equally sucking with and without mbuma. - Giant leak in NFS code sometimes occurs, can't reproduce but currently analyzing; brueffer is able to reproduce but THIS IS NOT an mbuma-specific problem and currently occurs even WITHOUT mbuma. - Issues in network locking: there is at least one code path in the rip code where one or more locks are acquired and we end up in m_prepend() with M_WAITOK, which causes WITNESS to whine from within UMA. Current temporary solution: force all UMA allocations to be M_NOWAIT from within UMA for now to avoid deadlocks unless WITNESS is defined and we can determine with certainty that we're not holding any locks when we're M_WAITOK. - I've seen at least one weird socketbuffer empty-but- mbuf-still-attached panic. I don't believe this to be related to mbuma but please keep your eyes open, turn on debugging, and capture crash dumps. This change removes more code than it adds. A paper is available detailing the change and considering various performance issues, it was presented at BSDCan2004: http://www.unixdaemons.com/~bmilekic/netbuf_bmilekic.pdf Please read the paper for Future Work and implementation details, as well as credits. Testing and Debugging: rwatson, brueffer, Ketrien I. Saihr-Kesenchedra, ... Reviewed by: Lots of people (for different parts)
2004-05-31 21:46:06 +00:00
/*
* Hook event handler for low-memory situation, used to
* drain protocols and push data back to the caches (UMA
* later pushes it back to VM).
*/
EVENTHANDLER_REGISTER(vm_lowmem, mb_reclaim, NULL,
EVENTHANDLER_PRI_FIRST);
Restructure mbuf send tags to provide stronger guarantees. - Perform ifp mismatch checks (to determine if a send tag is allocated for a different ifp than the one the packet is being output on), in ip_output() and ip6_output(). This avoids sending packets with send tags to ifnet drivers that don't support send tags. Since we are now checking for ifp mismatches before invoking if_output, we can now try to allocate a new tag before invoking if_output sending the original packet on the new tag if allocation succeeds. To avoid code duplication for the fragment and unfragmented cases, add ip_output_send() and ip6_output_send() as wrappers around if_output and nd6_output_ifp, respectively. All of the logic for setting send tags and dealing with send tag-related errors is done in these wrapper functions. For pseudo interfaces that wrap other network interfaces (vlan and lagg), wrapper send tags are now allocated so that ip*_output see the wrapper ifp as the ifp in the send tag. The if_transmit routines rewrite the send tags after performing an ifp mismatch check. If an ifp mismatch is detected, the transmit routines fail with EAGAIN. - To provide clearer life cycle management of send tags, especially in the presence of vlan and lagg wrapper tags, add a reference count to send tags managed via m_snd_tag_ref() and m_snd_tag_rele(). Provide a helper function (m_snd_tag_init()) for use by drivers supporting send tags. m_snd_tag_init() takes care of the if_ref on the ifp meaning that code alloating send tags via if_snd_tag_alloc no longer has to manage that manually. Similarly, m_snd_tag_rele drops the refcount on the ifp after invoking if_snd_tag_free when the last reference to a send tag is dropped. This also closes use after free races if there are pending packets in driver tx rings after the socket is closed (e.g. from tcpdrop). In order for m_free to work reliably, add a new CSUM_SND_TAG flag in csum_flags to indicate 'snd_tag' is set (rather than 'rcvif'). Drivers now also check this flag instead of checking snd_tag against NULL. This avoids false positive matches when a forwarded packet has a non-NULL rcvif that was treated as a send tag. - cxgbe was relying on snd_tag_free being called when the inp was detached so that it could kick the firmware to flush any pending work on the flow. This is because the driver doesn't require ACK messages from the firmware for every request, but instead does a kind of manual interrupt coalescing by only setting a flag to request a completion on a subset of requests. If all of the in-flight requests don't have the flag when the tag is detached from the inp, the flow might never return the credits. The current snd_tag_free command issues a flush command to force the credits to return. However, the credit return is what also frees the mbufs, and since those mbufs now hold references on the tag, this meant that snd_tag_free would never be called. To fix, explicitly drop the mbuf's reference on the snd tag when the mbuf is queued in the firmware work queue. This means that once the inp's reference on the tag goes away and all in-flight mbufs have been queued to the firmware, tag's refcount will drop to zero and snd_tag_free will kick in and send the flush request. Note that we need to avoid doing this in the middle of ethofld_tx(), so the driver grabs a temporary reference on the tag around that loop to defer the free to the end of the function in case it sends the last mbuf to the queue after the inp has dropped its reference on the tag. - mlx5 preallocates send tags and was using the ifp pointer even when the send tag wasn't in use. Explicitly use the ifp from other data structures instead. - Sprinkle some assertions in various places to assert that received packets don't have a send tag, and that other places that overwrite rcvif (e.g. 802.11 transmit) don't clobber a send tag pointer. Reviewed by: gallatin, hselasky, rgrimes, ae Sponsored by: Netflix Differential Revision: https://reviews.freebsd.org/D20117
2019-05-24 22:30:40 +00:00
snd_tag_count = counter_u64_alloc(M_WAITOK);
Bring in mbuma to replace mballoc. mbuma is an Mbuf & Cluster allocator built on top of a number of extensions to the UMA framework, all included herein. Extensions to UMA worth noting: - Better layering between slab <-> zone caches; introduce Keg structure which splits off slab cache away from the zone structure and allows multiple zones to be stacked on top of a single Keg (single type of slab cache); perhaps we should look into defining a subset API on top of the Keg for special use by malloc(9), for example. - UMA_ZONE_REFCNT zones can now be added, and reference counters automagically allocated for them within the end of the associated slab structures. uma_find_refcnt() does a kextract to fetch the slab struct reference from the underlying page, and lookup the corresponding refcnt. mbuma things worth noting: - integrates mbuf & cluster allocations with extended UMA and provides caches for commonly-allocated items; defines several zones (two primary, one secondary) and two kegs. - change up certain code paths that always used to do: m_get() + m_clget() to instead just use m_getcl() and try to take advantage of the newly defined secondary Packet zone. - netstat(1) and systat(1) quickly hacked up to do basic stat reporting but additional stats work needs to be done once some other details within UMA have been taken care of and it becomes clearer to how stats will work within the modified framework. From the user perspective, one implication is that the NMBCLUSTERS compile-time option is no longer used. The maximum number of clusters is still capped off according to maxusers, but it can be made unlimited by setting the kern.ipc.nmbclusters boot-time tunable to zero. Work should be done to write an appropriate sysctl handler allowing dynamic tuning of kern.ipc.nmbclusters at runtime. Additional things worth noting/known issues (READ): - One report of 'ips' (ServeRAID) driver acting really slow in conjunction with mbuma. Need more data. Latest report is that ips is equally sucking with and without mbuma. - Giant leak in NFS code sometimes occurs, can't reproduce but currently analyzing; brueffer is able to reproduce but THIS IS NOT an mbuma-specific problem and currently occurs even WITHOUT mbuma. - Issues in network locking: there is at least one code path in the rip code where one or more locks are acquired and we end up in m_prepend() with M_WAITOK, which causes WITNESS to whine from within UMA. Current temporary solution: force all UMA allocations to be M_NOWAIT from within UMA for now to avoid deadlocks unless WITNESS is defined and we can determine with certainty that we're not holding any locks when we're M_WAITOK. - I've seen at least one weird socketbuffer empty-but- mbuf-still-attached panic. I don't believe this to be related to mbuma but please keep your eyes open, turn on debugging, and capture crash dumps. This change removes more code than it adds. A paper is available detailing the change and considering various performance issues, it was presented at BSDCan2004: http://www.unixdaemons.com/~bmilekic/netbuf_bmilekic.pdf Please read the paper for Future Work and implementation details, as well as credits. Testing and Debugging: rwatson, brueffer, Ketrien I. Saihr-Kesenchedra, ... Reviewed by: Lots of people (for different parts)
2004-05-31 21:46:06 +00:00
}
Move the mbuf memory limit calculations from init_param2() to tunable_mbinit() where it is next to where it is used later. Change the sysinit level of tunable_mbinit() from SI_SUB_TUNABLES to SI_SUB_KMEM after the VM is running. This allows to use better methods to determine the effectively available physical and virtual memory available to the kernel. Update comments. In a second step it can be merged into mbuf_init().
2013-01-17 21:28:31 +00:00
SYSINIT(mbuf, SI_SUB_MBUF, SI_ORDER_FIRST, mbuf_init, NULL);
Bring in mbuma to replace mballoc. mbuma is an Mbuf & Cluster allocator built on top of a number of extensions to the UMA framework, all included herein. Extensions to UMA worth noting: - Better layering between slab <-> zone caches; introduce Keg structure which splits off slab cache away from the zone structure and allows multiple zones to be stacked on top of a single Keg (single type of slab cache); perhaps we should look into defining a subset API on top of the Keg for special use by malloc(9), for example. - UMA_ZONE_REFCNT zones can now be added, and reference counters automagically allocated for them within the end of the associated slab structures. uma_find_refcnt() does a kextract to fetch the slab struct reference from the underlying page, and lookup the corresponding refcnt. mbuma things worth noting: - integrates mbuf & cluster allocations with extended UMA and provides caches for commonly-allocated items; defines several zones (two primary, one secondary) and two kegs. - change up certain code paths that always used to do: m_get() + m_clget() to instead just use m_getcl() and try to take advantage of the newly defined secondary Packet zone. - netstat(1) and systat(1) quickly hacked up to do basic stat reporting but additional stats work needs to be done once some other details within UMA have been taken care of and it becomes clearer to how stats will work within the modified framework. From the user perspective, one implication is that the NMBCLUSTERS compile-time option is no longer used. The maximum number of clusters is still capped off according to maxusers, but it can be made unlimited by setting the kern.ipc.nmbclusters boot-time tunable to zero. Work should be done to write an appropriate sysctl handler allowing dynamic tuning of kern.ipc.nmbclusters at runtime. Additional things worth noting/known issues (READ): - One report of 'ips' (ServeRAID) driver acting really slow in conjunction with mbuma. Need more data. Latest report is that ips is equally sucking with and without mbuma. - Giant leak in NFS code sometimes occurs, can't reproduce but currently analyzing; brueffer is able to reproduce but THIS IS NOT an mbuma-specific problem and currently occurs even WITHOUT mbuma. - Issues in network locking: there is at least one code path in the rip code where one or more locks are acquired and we end up in m_prepend() with M_WAITOK, which causes WITNESS to whine from within UMA. Current temporary solution: force all UMA allocations to be M_NOWAIT from within UMA for now to avoid deadlocks unless WITNESS is defined and we can determine with certainty that we're not holding any locks when we're M_WAITOK. - I've seen at least one weird socketbuffer empty-but- mbuf-still-attached panic. I don't believe this to be related to mbuma but please keep your eyes open, turn on debugging, and capture crash dumps. This change removes more code than it adds. A paper is available detailing the change and considering various performance issues, it was presented at BSDCan2004: http://www.unixdaemons.com/~bmilekic/netbuf_bmilekic.pdf Please read the paper for Future Work and implementation details, as well as credits. Testing and Debugging: rwatson, brueffer, Ketrien I. Saihr-Kesenchedra, ... Reviewed by: Lots of people (for different parts)
2004-05-31 21:46:06 +00:00
Split out a more generic debugnet(4) from netdump(4) Debugnet is a simplistic and specialized panic- or debug-time reliable datagram transport. It can drive a single connection at a time and is currently unidirectional (debug/panic machine transmit to remote server only). It is mostly a verbatim code lift from netdump(4). Netdump(4) remains the only consumer (until the rest of this patch series lands). The INET-specific logic has been extracted somewhat more thoroughly than previously in netdump(4), into debugnet_inet.c. UDP-layer logic and up, as much as possible as is protocol-independent, remains in debugnet.c. The separation is not perfect and future improvement is welcome. Supporting INET6 is a long-term goal. Much of the diff is "gratuitous" renaming from 'netdump_' or 'nd_' to 'debugnet_' or 'dn_' -- sorry. I thought keeping the netdump name on the generic module would be more confusing than the refactoring. The only functional change here is the mbuf allocation / tracking. Instead of initiating solely on netdump-configured interface(s) at dumpon(8) configuration time, we watch for any debugnet-enabled NIC for link activation and query it for mbuf parameters at that time. If they exceed the existing high-water mark allocation, we re-allocate and track the new high-water mark. Otherwise, we leave the pre-panic mbuf allocation alone. In a future patch in this series, this will allow initiating netdump from panic ddb(4) without pre-panic configuration. No other functional change intended. Reviewed by: markj (earlier version) Some discussion with: emaste, jhb Objection from: marius Differential Revision: https://reviews.freebsd.org/D21421
2019-10-17 16:23:03 +00:00
#ifdef DEBUGNET
Add an mbuf allocator for netdump. The aim is to permit mbuf allocations after a panic without calling into the page allocator, without imposing any runtime overhead during regular operation of the system, and without modifying driver code. The approach taken is to preallocate a number of mbufs and clusters, storing them in linked lists, and using the lists to back some UMA cache zones. At panic time, the mbuf and cluster zone pointers are overwritten with those of the cache zones so that the mbuf allocator returns preallocated items. Using this scheme, drivers which cache mbuf zone pointers from m_getzone() require special handling when implementing netdump support. Reviewed by: cem (earlier version), julian, sbruno MFC after: 1 month Sponsored by: Dell EMC Isilon Differential Revision: https://reviews.freebsd.org/D15251
2018-05-06 00:19:48 +00:00
/*
Split out a more generic debugnet(4) from netdump(4) Debugnet is a simplistic and specialized panic- or debug-time reliable datagram transport. It can drive a single connection at a time and is currently unidirectional (debug/panic machine transmit to remote server only). It is mostly a verbatim code lift from netdump(4). Netdump(4) remains the only consumer (until the rest of this patch series lands). The INET-specific logic has been extracted somewhat more thoroughly than previously in netdump(4), into debugnet_inet.c. UDP-layer logic and up, as much as possible as is protocol-independent, remains in debugnet.c. The separation is not perfect and future improvement is welcome. Supporting INET6 is a long-term goal. Much of the diff is "gratuitous" renaming from 'netdump_' or 'nd_' to 'debugnet_' or 'dn_' -- sorry. I thought keeping the netdump name on the generic module would be more confusing than the refactoring. The only functional change here is the mbuf allocation / tracking. Instead of initiating solely on netdump-configured interface(s) at dumpon(8) configuration time, we watch for any debugnet-enabled NIC for link activation and query it for mbuf parameters at that time. If they exceed the existing high-water mark allocation, we re-allocate and track the new high-water mark. Otherwise, we leave the pre-panic mbuf allocation alone. In a future patch in this series, this will allow initiating netdump from panic ddb(4) without pre-panic configuration. No other functional change intended. Reviewed by: markj (earlier version) Some discussion with: emaste, jhb Objection from: marius Differential Revision: https://reviews.freebsd.org/D21421
2019-10-17 16:23:03 +00:00
* debugnet makes use of a pre-allocated pool of mbufs and clusters. When
* debugnet is configured, we initialize a set of UMA cache zones which return
Add an mbuf allocator for netdump. The aim is to permit mbuf allocations after a panic without calling into the page allocator, without imposing any runtime overhead during regular operation of the system, and without modifying driver code. The approach taken is to preallocate a number of mbufs and clusters, storing them in linked lists, and using the lists to back some UMA cache zones. At panic time, the mbuf and cluster zone pointers are overwritten with those of the cache zones so that the mbuf allocator returns preallocated items. Using this scheme, drivers which cache mbuf zone pointers from m_getzone() require special handling when implementing netdump support. Reviewed by: cem (earlier version), julian, sbruno MFC after: 1 month Sponsored by: Dell EMC Isilon Differential Revision: https://reviews.freebsd.org/D15251
2018-05-06 00:19:48 +00:00
* items from this pool. At panic-time, the regular UMA zone pointers are
* overwritten with those of the cache zones so that drivers may allocate and
* free mbufs and clusters without attempting to allocate physical memory.
*
* We keep mbufs and clusters in a pair of mbuf queues. In particular, for
* the purpose of caching clusters, we treat them as mbufs.
*/
Split out a more generic debugnet(4) from netdump(4) Debugnet is a simplistic and specialized panic- or debug-time reliable datagram transport. It can drive a single connection at a time and is currently unidirectional (debug/panic machine transmit to remote server only). It is mostly a verbatim code lift from netdump(4). Netdump(4) remains the only consumer (until the rest of this patch series lands). The INET-specific logic has been extracted somewhat more thoroughly than previously in netdump(4), into debugnet_inet.c. UDP-layer logic and up, as much as possible as is protocol-independent, remains in debugnet.c. The separation is not perfect and future improvement is welcome. Supporting INET6 is a long-term goal. Much of the diff is "gratuitous" renaming from 'netdump_' or 'nd_' to 'debugnet_' or 'dn_' -- sorry. I thought keeping the netdump name on the generic module would be more confusing than the refactoring. The only functional change here is the mbuf allocation / tracking. Instead of initiating solely on netdump-configured interface(s) at dumpon(8) configuration time, we watch for any debugnet-enabled NIC for link activation and query it for mbuf parameters at that time. If they exceed the existing high-water mark allocation, we re-allocate and track the new high-water mark. Otherwise, we leave the pre-panic mbuf allocation alone. In a future patch in this series, this will allow initiating netdump from panic ddb(4) without pre-panic configuration. No other functional change intended. Reviewed by: markj (earlier version) Some discussion with: emaste, jhb Objection from: marius Differential Revision: https://reviews.freebsd.org/D21421
2019-10-17 16:23:03 +00:00
static struct mbufq dn_mbufq =
{ STAILQ_HEAD_INITIALIZER(dn_mbufq.mq_head), 0, INT_MAX };
static struct mbufq dn_clustq =
{ STAILQ_HEAD_INITIALIZER(dn_clustq.mq_head), 0, INT_MAX };
static int dn_clsize;
static uma_zone_t dn_zone_mbuf;
static uma_zone_t dn_zone_clust;
static uma_zone_t dn_zone_pack;
static struct debugnet_saved_zones {
uma_zone_t dsz_mbuf;
uma_zone_t dsz_clust;
uma_zone_t dsz_pack;
uma_zone_t dsz_jumbop;
uma_zone_t dsz_jumbo9;
uma_zone_t dsz_jumbo16;
bool dsz_debugnet_zones_enabled;
} dn_saved_zones;
Add an mbuf allocator for netdump. The aim is to permit mbuf allocations after a panic without calling into the page allocator, without imposing any runtime overhead during regular operation of the system, and without modifying driver code. The approach taken is to preallocate a number of mbufs and clusters, storing them in linked lists, and using the lists to back some UMA cache zones. At panic time, the mbuf and cluster zone pointers are overwritten with those of the cache zones so that the mbuf allocator returns preallocated items. Using this scheme, drivers which cache mbuf zone pointers from m_getzone() require special handling when implementing netdump support. Reviewed by: cem (earlier version), julian, sbruno MFC after: 1 month Sponsored by: Dell EMC Isilon Differential Revision: https://reviews.freebsd.org/D15251
2018-05-06 00:19:48 +00:00
static int
Split out a more generic debugnet(4) from netdump(4) Debugnet is a simplistic and specialized panic- or debug-time reliable datagram transport. It can drive a single connection at a time and is currently unidirectional (debug/panic machine transmit to remote server only). It is mostly a verbatim code lift from netdump(4). Netdump(4) remains the only consumer (until the rest of this patch series lands). The INET-specific logic has been extracted somewhat more thoroughly than previously in netdump(4), into debugnet_inet.c. UDP-layer logic and up, as much as possible as is protocol-independent, remains in debugnet.c. The separation is not perfect and future improvement is welcome. Supporting INET6 is a long-term goal. Much of the diff is "gratuitous" renaming from 'netdump_' or 'nd_' to 'debugnet_' or 'dn_' -- sorry. I thought keeping the netdump name on the generic module would be more confusing than the refactoring. The only functional change here is the mbuf allocation / tracking. Instead of initiating solely on netdump-configured interface(s) at dumpon(8) configuration time, we watch for any debugnet-enabled NIC for link activation and query it for mbuf parameters at that time. If they exceed the existing high-water mark allocation, we re-allocate and track the new high-water mark. Otherwise, we leave the pre-panic mbuf allocation alone. In a future patch in this series, this will allow initiating netdump from panic ddb(4) without pre-panic configuration. No other functional change intended. Reviewed by: markj (earlier version) Some discussion with: emaste, jhb Objection from: marius Differential Revision: https://reviews.freebsd.org/D21421
2019-10-17 16:23:03 +00:00
dn_buf_import(void *arg, void **store, int count, int domain __unused,
Add an mbuf allocator for netdump. The aim is to permit mbuf allocations after a panic without calling into the page allocator, without imposing any runtime overhead during regular operation of the system, and without modifying driver code. The approach taken is to preallocate a number of mbufs and clusters, storing them in linked lists, and using the lists to back some UMA cache zones. At panic time, the mbuf and cluster zone pointers are overwritten with those of the cache zones so that the mbuf allocator returns preallocated items. Using this scheme, drivers which cache mbuf zone pointers from m_getzone() require special handling when implementing netdump support. Reviewed by: cem (earlier version), julian, sbruno MFC after: 1 month Sponsored by: Dell EMC Isilon Differential Revision: https://reviews.freebsd.org/D15251
2018-05-06 00:19:48 +00:00
int flags)
{
struct mbufq *q;
struct mbuf *m;
int i;
q = arg;
for (i = 0; i < count; i++) {
m = mbufq_dequeue(q);
if (m == NULL)
break;
Split out a more generic debugnet(4) from netdump(4) Debugnet is a simplistic and specialized panic- or debug-time reliable datagram transport. It can drive a single connection at a time and is currently unidirectional (debug/panic machine transmit to remote server only). It is mostly a verbatim code lift from netdump(4). Netdump(4) remains the only consumer (until the rest of this patch series lands). The INET-specific logic has been extracted somewhat more thoroughly than previously in netdump(4), into debugnet_inet.c. UDP-layer logic and up, as much as possible as is protocol-independent, remains in debugnet.c. The separation is not perfect and future improvement is welcome. Supporting INET6 is a long-term goal. Much of the diff is "gratuitous" renaming from 'netdump_' or 'nd_' to 'debugnet_' or 'dn_' -- sorry. I thought keeping the netdump name on the generic module would be more confusing than the refactoring. The only functional change here is the mbuf allocation / tracking. Instead of initiating solely on netdump-configured interface(s) at dumpon(8) configuration time, we watch for any debugnet-enabled NIC for link activation and query it for mbuf parameters at that time. If they exceed the existing high-water mark allocation, we re-allocate and track the new high-water mark. Otherwise, we leave the pre-panic mbuf allocation alone. In a future patch in this series, this will allow initiating netdump from panic ddb(4) without pre-panic configuration. No other functional change intended. Reviewed by: markj (earlier version) Some discussion with: emaste, jhb Objection from: marius Differential Revision: https://reviews.freebsd.org/D21421
2019-10-17 16:23:03 +00:00
trash_init(m, q == &dn_mbufq ? MSIZE : dn_clsize, flags);
Add an mbuf allocator for netdump. The aim is to permit mbuf allocations after a panic without calling into the page allocator, without imposing any runtime overhead during regular operation of the system, and without modifying driver code. The approach taken is to preallocate a number of mbufs and clusters, storing them in linked lists, and using the lists to back some UMA cache zones. At panic time, the mbuf and cluster zone pointers are overwritten with those of the cache zones so that the mbuf allocator returns preallocated items. Using this scheme, drivers which cache mbuf zone pointers from m_getzone() require special handling when implementing netdump support. Reviewed by: cem (earlier version), julian, sbruno MFC after: 1 month Sponsored by: Dell EMC Isilon Differential Revision: https://reviews.freebsd.org/D15251
2018-05-06 00:19:48 +00:00
store[i] = m;
}
netdump: Fix netdumping with INVARIANTS kernels Correct boneheaded assertion I added in r339501. Mea culpa. The intent is to notice when an M_WAITOK zone allocation would fail during netdump, not to prevent all use of mbufs during netdump. Reviewed by: markj X-MFC-With: r339501 Differential Revision: https://reviews.freebsd.org/D17957
2018-11-12 05:24:20 +00:00
KASSERT((flags & M_WAITOK) == 0 || i == count,
("%s: ran out of pre-allocated mbufs", __func__));
Add an mbuf allocator for netdump. The aim is to permit mbuf allocations after a panic without calling into the page allocator, without imposing any runtime overhead during regular operation of the system, and without modifying driver code. The approach taken is to preallocate a number of mbufs and clusters, storing them in linked lists, and using the lists to back some UMA cache zones. At panic time, the mbuf and cluster zone pointers are overwritten with those of the cache zones so that the mbuf allocator returns preallocated items. Using this scheme, drivers which cache mbuf zone pointers from m_getzone() require special handling when implementing netdump support. Reviewed by: cem (earlier version), julian, sbruno MFC after: 1 month Sponsored by: Dell EMC Isilon Differential Revision: https://reviews.freebsd.org/D15251
2018-05-06 00:19:48 +00:00
return (i);
}
static void
Split out a more generic debugnet(4) from netdump(4) Debugnet is a simplistic and specialized panic- or debug-time reliable datagram transport. It can drive a single connection at a time and is currently unidirectional (debug/panic machine transmit to remote server only). It is mostly a verbatim code lift from netdump(4). Netdump(4) remains the only consumer (until the rest of this patch series lands). The INET-specific logic has been extracted somewhat more thoroughly than previously in netdump(4), into debugnet_inet.c. UDP-layer logic and up, as much as possible as is protocol-independent, remains in debugnet.c. The separation is not perfect and future improvement is welcome. Supporting INET6 is a long-term goal. Much of the diff is "gratuitous" renaming from 'netdump_' or 'nd_' to 'debugnet_' or 'dn_' -- sorry. I thought keeping the netdump name on the generic module would be more confusing than the refactoring. The only functional change here is the mbuf allocation / tracking. Instead of initiating solely on netdump-configured interface(s) at dumpon(8) configuration time, we watch for any debugnet-enabled NIC for link activation and query it for mbuf parameters at that time. If they exceed the existing high-water mark allocation, we re-allocate and track the new high-water mark. Otherwise, we leave the pre-panic mbuf allocation alone. In a future patch in this series, this will allow initiating netdump from panic ddb(4) without pre-panic configuration. No other functional change intended. Reviewed by: markj (earlier version) Some discussion with: emaste, jhb Objection from: marius Differential Revision: https://reviews.freebsd.org/D21421
2019-10-17 16:23:03 +00:00
dn_buf_release(void *arg, void **store, int count)
Add an mbuf allocator for netdump. The aim is to permit mbuf allocations after a panic without calling into the page allocator, without imposing any runtime overhead during regular operation of the system, and without modifying driver code. The approach taken is to preallocate a number of mbufs and clusters, storing them in linked lists, and using the lists to back some UMA cache zones. At panic time, the mbuf and cluster zone pointers are overwritten with those of the cache zones so that the mbuf allocator returns preallocated items. Using this scheme, drivers which cache mbuf zone pointers from m_getzone() require special handling when implementing netdump support. Reviewed by: cem (earlier version), julian, sbruno MFC after: 1 month Sponsored by: Dell EMC Isilon Differential Revision: https://reviews.freebsd.org/D15251
2018-05-06 00:19:48 +00:00
{
struct mbufq *q;
struct mbuf *m;
int i;
q = arg;
for (i = 0; i < count; i++) {
m = store[i];
(void)mbufq_enqueue(q, m);
}
}
static int
Split out a more generic debugnet(4) from netdump(4) Debugnet is a simplistic and specialized panic- or debug-time reliable datagram transport. It can drive a single connection at a time and is currently unidirectional (debug/panic machine transmit to remote server only). It is mostly a verbatim code lift from netdump(4). Netdump(4) remains the only consumer (until the rest of this patch series lands). The INET-specific logic has been extracted somewhat more thoroughly than previously in netdump(4), into debugnet_inet.c. UDP-layer logic and up, as much as possible as is protocol-independent, remains in debugnet.c. The separation is not perfect and future improvement is welcome. Supporting INET6 is a long-term goal. Much of the diff is "gratuitous" renaming from 'netdump_' or 'nd_' to 'debugnet_' or 'dn_' -- sorry. I thought keeping the netdump name on the generic module would be more confusing than the refactoring. The only functional change here is the mbuf allocation / tracking. Instead of initiating solely on netdump-configured interface(s) at dumpon(8) configuration time, we watch for any debugnet-enabled NIC for link activation and query it for mbuf parameters at that time. If they exceed the existing high-water mark allocation, we re-allocate and track the new high-water mark. Otherwise, we leave the pre-panic mbuf allocation alone. In a future patch in this series, this will allow initiating netdump from panic ddb(4) without pre-panic configuration. No other functional change intended. Reviewed by: markj (earlier version) Some discussion with: emaste, jhb Objection from: marius Differential Revision: https://reviews.freebsd.org/D21421
2019-10-17 16:23:03 +00:00
dn_pack_import(void *arg __unused, void **store, int count, int domain __unused,
Add an mbuf allocator for netdump. The aim is to permit mbuf allocations after a panic without calling into the page allocator, without imposing any runtime overhead during regular operation of the system, and without modifying driver code. The approach taken is to preallocate a number of mbufs and clusters, storing them in linked lists, and using the lists to back some UMA cache zones. At panic time, the mbuf and cluster zone pointers are overwritten with those of the cache zones so that the mbuf allocator returns preallocated items. Using this scheme, drivers which cache mbuf zone pointers from m_getzone() require special handling when implementing netdump support. Reviewed by: cem (earlier version), julian, sbruno MFC after: 1 month Sponsored by: Dell EMC Isilon Differential Revision: https://reviews.freebsd.org/D15251
2018-05-06 00:19:48 +00:00
int flags __unused)
{
struct mbuf *m;
void *clust;
int i;
for (i = 0; i < count; i++) {
m = m_get(MT_DATA, M_NOWAIT);
if (m == NULL)
break;
Split out a more generic debugnet(4) from netdump(4) Debugnet is a simplistic and specialized panic- or debug-time reliable datagram transport. It can drive a single connection at a time and is currently unidirectional (debug/panic machine transmit to remote server only). It is mostly a verbatim code lift from netdump(4). Netdump(4) remains the only consumer (until the rest of this patch series lands). The INET-specific logic has been extracted somewhat more thoroughly than previously in netdump(4), into debugnet_inet.c. UDP-layer logic and up, as much as possible as is protocol-independent, remains in debugnet.c. The separation is not perfect and future improvement is welcome. Supporting INET6 is a long-term goal. Much of the diff is "gratuitous" renaming from 'netdump_' or 'nd_' to 'debugnet_' or 'dn_' -- sorry. I thought keeping the netdump name on the generic module would be more confusing than the refactoring. The only functional change here is the mbuf allocation / tracking. Instead of initiating solely on netdump-configured interface(s) at dumpon(8) configuration time, we watch for any debugnet-enabled NIC for link activation and query it for mbuf parameters at that time. If they exceed the existing high-water mark allocation, we re-allocate and track the new high-water mark. Otherwise, we leave the pre-panic mbuf allocation alone. In a future patch in this series, this will allow initiating netdump from panic ddb(4) without pre-panic configuration. No other functional change intended. Reviewed by: markj (earlier version) Some discussion with: emaste, jhb Objection from: marius Differential Revision: https://reviews.freebsd.org/D21421
2019-10-17 16:23:03 +00:00
clust = uma_zalloc(dn_zone_clust, M_NOWAIT);
Add an mbuf allocator for netdump. The aim is to permit mbuf allocations after a panic without calling into the page allocator, without imposing any runtime overhead during regular operation of the system, and without modifying driver code. The approach taken is to preallocate a number of mbufs and clusters, storing them in linked lists, and using the lists to back some UMA cache zones. At panic time, the mbuf and cluster zone pointers are overwritten with those of the cache zones so that the mbuf allocator returns preallocated items. Using this scheme, drivers which cache mbuf zone pointers from m_getzone() require special handling when implementing netdump support. Reviewed by: cem (earlier version), julian, sbruno MFC after: 1 month Sponsored by: Dell EMC Isilon Differential Revision: https://reviews.freebsd.org/D15251
2018-05-06 00:19:48 +00:00
if (clust == NULL) {
m_free(m);
break;
}
Split out a more generic debugnet(4) from netdump(4) Debugnet is a simplistic and specialized panic- or debug-time reliable datagram transport. It can drive a single connection at a time and is currently unidirectional (debug/panic machine transmit to remote server only). It is mostly a verbatim code lift from netdump(4). Netdump(4) remains the only consumer (until the rest of this patch series lands). The INET-specific logic has been extracted somewhat more thoroughly than previously in netdump(4), into debugnet_inet.c. UDP-layer logic and up, as much as possible as is protocol-independent, remains in debugnet.c. The separation is not perfect and future improvement is welcome. Supporting INET6 is a long-term goal. Much of the diff is "gratuitous" renaming from 'netdump_' or 'nd_' to 'debugnet_' or 'dn_' -- sorry. I thought keeping the netdump name on the generic module would be more confusing than the refactoring. The only functional change here is the mbuf allocation / tracking. Instead of initiating solely on netdump-configured interface(s) at dumpon(8) configuration time, we watch for any debugnet-enabled NIC for link activation and query it for mbuf parameters at that time. If they exceed the existing high-water mark allocation, we re-allocate and track the new high-water mark. Otherwise, we leave the pre-panic mbuf allocation alone. In a future patch in this series, this will allow initiating netdump from panic ddb(4) without pre-panic configuration. No other functional change intended. Reviewed by: markj (earlier version) Some discussion with: emaste, jhb Objection from: marius Differential Revision: https://reviews.freebsd.org/D21421
2019-10-17 16:23:03 +00:00
mb_ctor_clust(clust, dn_clsize, m, 0);
Add an mbuf allocator for netdump. The aim is to permit mbuf allocations after a panic without calling into the page allocator, without imposing any runtime overhead during regular operation of the system, and without modifying driver code. The approach taken is to preallocate a number of mbufs and clusters, storing them in linked lists, and using the lists to back some UMA cache zones. At panic time, the mbuf and cluster zone pointers are overwritten with those of the cache zones so that the mbuf allocator returns preallocated items. Using this scheme, drivers which cache mbuf zone pointers from m_getzone() require special handling when implementing netdump support. Reviewed by: cem (earlier version), julian, sbruno MFC after: 1 month Sponsored by: Dell EMC Isilon Differential Revision: https://reviews.freebsd.org/D15251
2018-05-06 00:19:48 +00:00
store[i] = m;
}
netdump: Fix netdumping with INVARIANTS kernels Correct boneheaded assertion I added in r339501. Mea culpa. The intent is to notice when an M_WAITOK zone allocation would fail during netdump, not to prevent all use of mbufs during netdump. Reviewed by: markj X-MFC-With: r339501 Differential Revision: https://reviews.freebsd.org/D17957
2018-11-12 05:24:20 +00:00
KASSERT((flags & M_WAITOK) == 0 || i == count,
("%s: ran out of pre-allocated mbufs", __func__));
Add an mbuf allocator for netdump. The aim is to permit mbuf allocations after a panic without calling into the page allocator, without imposing any runtime overhead during regular operation of the system, and without modifying driver code. The approach taken is to preallocate a number of mbufs and clusters, storing them in linked lists, and using the lists to back some UMA cache zones. At panic time, the mbuf and cluster zone pointers are overwritten with those of the cache zones so that the mbuf allocator returns preallocated items. Using this scheme, drivers which cache mbuf zone pointers from m_getzone() require special handling when implementing netdump support. Reviewed by: cem (earlier version), julian, sbruno MFC after: 1 month Sponsored by: Dell EMC Isilon Differential Revision: https://reviews.freebsd.org/D15251
2018-05-06 00:19:48 +00:00
return (i);
}
static void
Split out a more generic debugnet(4) from netdump(4) Debugnet is a simplistic and specialized panic- or debug-time reliable datagram transport. It can drive a single connection at a time and is currently unidirectional (debug/panic machine transmit to remote server only). It is mostly a verbatim code lift from netdump(4). Netdump(4) remains the only consumer (until the rest of this patch series lands). The INET-specific logic has been extracted somewhat more thoroughly than previously in netdump(4), into debugnet_inet.c. UDP-layer logic and up, as much as possible as is protocol-independent, remains in debugnet.c. The separation is not perfect and future improvement is welcome. Supporting INET6 is a long-term goal. Much of the diff is "gratuitous" renaming from 'netdump_' or 'nd_' to 'debugnet_' or 'dn_' -- sorry. I thought keeping the netdump name on the generic module would be more confusing than the refactoring. The only functional change here is the mbuf allocation / tracking. Instead of initiating solely on netdump-configured interface(s) at dumpon(8) configuration time, we watch for any debugnet-enabled NIC for link activation and query it for mbuf parameters at that time. If they exceed the existing high-water mark allocation, we re-allocate and track the new high-water mark. Otherwise, we leave the pre-panic mbuf allocation alone. In a future patch in this series, this will allow initiating netdump from panic ddb(4) without pre-panic configuration. No other functional change intended. Reviewed by: markj (earlier version) Some discussion with: emaste, jhb Objection from: marius Differential Revision: https://reviews.freebsd.org/D21421
2019-10-17 16:23:03 +00:00
dn_pack_release(void *arg __unused, void **store, int count)
Add an mbuf allocator for netdump. The aim is to permit mbuf allocations after a panic without calling into the page allocator, without imposing any runtime overhead during regular operation of the system, and without modifying driver code. The approach taken is to preallocate a number of mbufs and clusters, storing them in linked lists, and using the lists to back some UMA cache zones. At panic time, the mbuf and cluster zone pointers are overwritten with those of the cache zones so that the mbuf allocator returns preallocated items. Using this scheme, drivers which cache mbuf zone pointers from m_getzone() require special handling when implementing netdump support. Reviewed by: cem (earlier version), julian, sbruno MFC after: 1 month Sponsored by: Dell EMC Isilon Differential Revision: https://reviews.freebsd.org/D15251
2018-05-06 00:19:48 +00:00
{
struct mbuf *m;
void *clust;
int i;
for (i = 0; i < count; i++) {
m = store[i];
clust = m->m_ext.ext_buf;
Split out a more generic debugnet(4) from netdump(4) Debugnet is a simplistic and specialized panic- or debug-time reliable datagram transport. It can drive a single connection at a time and is currently unidirectional (debug/panic machine transmit to remote server only). It is mostly a verbatim code lift from netdump(4). Netdump(4) remains the only consumer (until the rest of this patch series lands). The INET-specific logic has been extracted somewhat more thoroughly than previously in netdump(4), into debugnet_inet.c. UDP-layer logic and up, as much as possible as is protocol-independent, remains in debugnet.c. The separation is not perfect and future improvement is welcome. Supporting INET6 is a long-term goal. Much of the diff is "gratuitous" renaming from 'netdump_' or 'nd_' to 'debugnet_' or 'dn_' -- sorry. I thought keeping the netdump name on the generic module would be more confusing than the refactoring. The only functional change here is the mbuf allocation / tracking. Instead of initiating solely on netdump-configured interface(s) at dumpon(8) configuration time, we watch for any debugnet-enabled NIC for link activation and query it for mbuf parameters at that time. If they exceed the existing high-water mark allocation, we re-allocate and track the new high-water mark. Otherwise, we leave the pre-panic mbuf allocation alone. In a future patch in this series, this will allow initiating netdump from panic ddb(4) without pre-panic configuration. No other functional change intended. Reviewed by: markj (earlier version) Some discussion with: emaste, jhb Objection from: marius Differential Revision: https://reviews.freebsd.org/D21421
2019-10-17 16:23:03 +00:00
uma_zfree(dn_zone_clust, clust);
uma_zfree(dn_zone_mbuf, m);
Add an mbuf allocator for netdump. The aim is to permit mbuf allocations after a panic without calling into the page allocator, without imposing any runtime overhead during regular operation of the system, and without modifying driver code. The approach taken is to preallocate a number of mbufs and clusters, storing them in linked lists, and using the lists to back some UMA cache zones. At panic time, the mbuf and cluster zone pointers are overwritten with those of the cache zones so that the mbuf allocator returns preallocated items. Using this scheme, drivers which cache mbuf zone pointers from m_getzone() require special handling when implementing netdump support. Reviewed by: cem (earlier version), julian, sbruno MFC after: 1 month Sponsored by: Dell EMC Isilon Differential Revision: https://reviews.freebsd.org/D15251
2018-05-06 00:19:48 +00:00
}
}
/*
Split out a more generic debugnet(4) from netdump(4) Debugnet is a simplistic and specialized panic- or debug-time reliable datagram transport. It can drive a single connection at a time and is currently unidirectional (debug/panic machine transmit to remote server only). It is mostly a verbatim code lift from netdump(4). Netdump(4) remains the only consumer (until the rest of this patch series lands). The INET-specific logic has been extracted somewhat more thoroughly than previously in netdump(4), into debugnet_inet.c. UDP-layer logic and up, as much as possible as is protocol-independent, remains in debugnet.c. The separation is not perfect and future improvement is welcome. Supporting INET6 is a long-term goal. Much of the diff is "gratuitous" renaming from 'netdump_' or 'nd_' to 'debugnet_' or 'dn_' -- sorry. I thought keeping the netdump name on the generic module would be more confusing than the refactoring. The only functional change here is the mbuf allocation / tracking. Instead of initiating solely on netdump-configured interface(s) at dumpon(8) configuration time, we watch for any debugnet-enabled NIC for link activation and query it for mbuf parameters at that time. If they exceed the existing high-water mark allocation, we re-allocate and track the new high-water mark. Otherwise, we leave the pre-panic mbuf allocation alone. In a future patch in this series, this will allow initiating netdump from panic ddb(4) without pre-panic configuration. No other functional change intended. Reviewed by: markj (earlier version) Some discussion with: emaste, jhb Objection from: marius Differential Revision: https://reviews.freebsd.org/D21421
2019-10-17 16:23:03 +00:00
* Free the pre-allocated mbufs and clusters reserved for debugnet, and destroy
Add an mbuf allocator for netdump. The aim is to permit mbuf allocations after a panic without calling into the page allocator, without imposing any runtime overhead during regular operation of the system, and without modifying driver code. The approach taken is to preallocate a number of mbufs and clusters, storing them in linked lists, and using the lists to back some UMA cache zones. At panic time, the mbuf and cluster zone pointers are overwritten with those of the cache zones so that the mbuf allocator returns preallocated items. Using this scheme, drivers which cache mbuf zone pointers from m_getzone() require special handling when implementing netdump support. Reviewed by: cem (earlier version), julian, sbruno MFC after: 1 month Sponsored by: Dell EMC Isilon Differential Revision: https://reviews.freebsd.org/D15251
2018-05-06 00:19:48 +00:00
* the corresponding UMA cache zones.
*/
void
Split out a more generic debugnet(4) from netdump(4) Debugnet is a simplistic and specialized panic- or debug-time reliable datagram transport. It can drive a single connection at a time and is currently unidirectional (debug/panic machine transmit to remote server only). It is mostly a verbatim code lift from netdump(4). Netdump(4) remains the only consumer (until the rest of this patch series lands). The INET-specific logic has been extracted somewhat more thoroughly than previously in netdump(4), into debugnet_inet.c. UDP-layer logic and up, as much as possible as is protocol-independent, remains in debugnet.c. The separation is not perfect and future improvement is welcome. Supporting INET6 is a long-term goal. Much of the diff is "gratuitous" renaming from 'netdump_' or 'nd_' to 'debugnet_' or 'dn_' -- sorry. I thought keeping the netdump name on the generic module would be more confusing than the refactoring. The only functional change here is the mbuf allocation / tracking. Instead of initiating solely on netdump-configured interface(s) at dumpon(8) configuration time, we watch for any debugnet-enabled NIC for link activation and query it for mbuf parameters at that time. If they exceed the existing high-water mark allocation, we re-allocate and track the new high-water mark. Otherwise, we leave the pre-panic mbuf allocation alone. In a future patch in this series, this will allow initiating netdump from panic ddb(4) without pre-panic configuration. No other functional change intended. Reviewed by: markj (earlier version) Some discussion with: emaste, jhb Objection from: marius Differential Revision: https://reviews.freebsd.org/D21421
2019-10-17 16:23:03 +00:00
debugnet_mbuf_drain(void)
Add an mbuf allocator for netdump. The aim is to permit mbuf allocations after a panic without calling into the page allocator, without imposing any runtime overhead during regular operation of the system, and without modifying driver code. The approach taken is to preallocate a number of mbufs and clusters, storing them in linked lists, and using the lists to back some UMA cache zones. At panic time, the mbuf and cluster zone pointers are overwritten with those of the cache zones so that the mbuf allocator returns preallocated items. Using this scheme, drivers which cache mbuf zone pointers from m_getzone() require special handling when implementing netdump support. Reviewed by: cem (earlier version), julian, sbruno MFC after: 1 month Sponsored by: Dell EMC Isilon Differential Revision: https://reviews.freebsd.org/D15251
2018-05-06 00:19:48 +00:00
{
struct mbuf *m;
void *item;
Split out a more generic debugnet(4) from netdump(4) Debugnet is a simplistic and specialized panic- or debug-time reliable datagram transport. It can drive a single connection at a time and is currently unidirectional (debug/panic machine transmit to remote server only). It is mostly a verbatim code lift from netdump(4). Netdump(4) remains the only consumer (until the rest of this patch series lands). The INET-specific logic has been extracted somewhat more thoroughly than previously in netdump(4), into debugnet_inet.c. UDP-layer logic and up, as much as possible as is protocol-independent, remains in debugnet.c. The separation is not perfect and future improvement is welcome. Supporting INET6 is a long-term goal. Much of the diff is "gratuitous" renaming from 'netdump_' or 'nd_' to 'debugnet_' or 'dn_' -- sorry. I thought keeping the netdump name on the generic module would be more confusing than the refactoring. The only functional change here is the mbuf allocation / tracking. Instead of initiating solely on netdump-configured interface(s) at dumpon(8) configuration time, we watch for any debugnet-enabled NIC for link activation and query it for mbuf parameters at that time. If they exceed the existing high-water mark allocation, we re-allocate and track the new high-water mark. Otherwise, we leave the pre-panic mbuf allocation alone. In a future patch in this series, this will allow initiating netdump from panic ddb(4) without pre-panic configuration. No other functional change intended. Reviewed by: markj (earlier version) Some discussion with: emaste, jhb Objection from: marius Differential Revision: https://reviews.freebsd.org/D21421
2019-10-17 16:23:03 +00:00
if (dn_zone_mbuf != NULL) {
uma_zdestroy(dn_zone_mbuf);
dn_zone_mbuf = NULL;
Add an mbuf allocator for netdump. The aim is to permit mbuf allocations after a panic without calling into the page allocator, without imposing any runtime overhead during regular operation of the system, and without modifying driver code. The approach taken is to preallocate a number of mbufs and clusters, storing them in linked lists, and using the lists to back some UMA cache zones. At panic time, the mbuf and cluster zone pointers are overwritten with those of the cache zones so that the mbuf allocator returns preallocated items. Using this scheme, drivers which cache mbuf zone pointers from m_getzone() require special handling when implementing netdump support. Reviewed by: cem (earlier version), julian, sbruno MFC after: 1 month Sponsored by: Dell EMC Isilon Differential Revision: https://reviews.freebsd.org/D15251
2018-05-06 00:19:48 +00:00
}
Split out a more generic debugnet(4) from netdump(4) Debugnet is a simplistic and specialized panic- or debug-time reliable datagram transport. It can drive a single connection at a time and is currently unidirectional (debug/panic machine transmit to remote server only). It is mostly a verbatim code lift from netdump(4). Netdump(4) remains the only consumer (until the rest of this patch series lands). The INET-specific logic has been extracted somewhat more thoroughly than previously in netdump(4), into debugnet_inet.c. UDP-layer logic and up, as much as possible as is protocol-independent, remains in debugnet.c. The separation is not perfect and future improvement is welcome. Supporting INET6 is a long-term goal. Much of the diff is "gratuitous" renaming from 'netdump_' or 'nd_' to 'debugnet_' or 'dn_' -- sorry. I thought keeping the netdump name on the generic module would be more confusing than the refactoring. The only functional change here is the mbuf allocation / tracking. Instead of initiating solely on netdump-configured interface(s) at dumpon(8) configuration time, we watch for any debugnet-enabled NIC for link activation and query it for mbuf parameters at that time. If they exceed the existing high-water mark allocation, we re-allocate and track the new high-water mark. Otherwise, we leave the pre-panic mbuf allocation alone. In a future patch in this series, this will allow initiating netdump from panic ddb(4) without pre-panic configuration. No other functional change intended. Reviewed by: markj (earlier version) Some discussion with: emaste, jhb Objection from: marius Differential Revision: https://reviews.freebsd.org/D21421
2019-10-17 16:23:03 +00:00
if (dn_zone_clust != NULL) {
uma_zdestroy(dn_zone_clust);
dn_zone_clust = NULL;
Add an mbuf allocator for netdump. The aim is to permit mbuf allocations after a panic without calling into the page allocator, without imposing any runtime overhead during regular operation of the system, and without modifying driver code. The approach taken is to preallocate a number of mbufs and clusters, storing them in linked lists, and using the lists to back some UMA cache zones. At panic time, the mbuf and cluster zone pointers are overwritten with those of the cache zones so that the mbuf allocator returns preallocated items. Using this scheme, drivers which cache mbuf zone pointers from m_getzone() require special handling when implementing netdump support. Reviewed by: cem (earlier version), julian, sbruno MFC after: 1 month Sponsored by: Dell EMC Isilon Differential Revision: https://reviews.freebsd.org/D15251
2018-05-06 00:19:48 +00:00
}
Split out a more generic debugnet(4) from netdump(4) Debugnet is a simplistic and specialized panic- or debug-time reliable datagram transport. It can drive a single connection at a time and is currently unidirectional (debug/panic machine transmit to remote server only). It is mostly a verbatim code lift from netdump(4). Netdump(4) remains the only consumer (until the rest of this patch series lands). The INET-specific logic has been extracted somewhat more thoroughly than previously in netdump(4), into debugnet_inet.c. UDP-layer logic and up, as much as possible as is protocol-independent, remains in debugnet.c. The separation is not perfect and future improvement is welcome. Supporting INET6 is a long-term goal. Much of the diff is "gratuitous" renaming from 'netdump_' or 'nd_' to 'debugnet_' or 'dn_' -- sorry. I thought keeping the netdump name on the generic module would be more confusing than the refactoring. The only functional change here is the mbuf allocation / tracking. Instead of initiating solely on netdump-configured interface(s) at dumpon(8) configuration time, we watch for any debugnet-enabled NIC for link activation and query it for mbuf parameters at that time. If they exceed the existing high-water mark allocation, we re-allocate and track the new high-water mark. Otherwise, we leave the pre-panic mbuf allocation alone. In a future patch in this series, this will allow initiating netdump from panic ddb(4) without pre-panic configuration. No other functional change intended. Reviewed by: markj (earlier version) Some discussion with: emaste, jhb Objection from: marius Differential Revision: https://reviews.freebsd.org/D21421
2019-10-17 16:23:03 +00:00
if (dn_zone_pack != NULL) {
uma_zdestroy(dn_zone_pack);
dn_zone_pack = NULL;
Add an mbuf allocator for netdump. The aim is to permit mbuf allocations after a panic without calling into the page allocator, without imposing any runtime overhead during regular operation of the system, and without modifying driver code. The approach taken is to preallocate a number of mbufs and clusters, storing them in linked lists, and using the lists to back some UMA cache zones. At panic time, the mbuf and cluster zone pointers are overwritten with those of the cache zones so that the mbuf allocator returns preallocated items. Using this scheme, drivers which cache mbuf zone pointers from m_getzone() require special handling when implementing netdump support. Reviewed by: cem (earlier version), julian, sbruno MFC after: 1 month Sponsored by: Dell EMC Isilon Differential Revision: https://reviews.freebsd.org/D15251
2018-05-06 00:19:48 +00:00
}
Split out a more generic debugnet(4) from netdump(4) Debugnet is a simplistic and specialized panic- or debug-time reliable datagram transport. It can drive a single connection at a time and is currently unidirectional (debug/panic machine transmit to remote server only). It is mostly a verbatim code lift from netdump(4). Netdump(4) remains the only consumer (until the rest of this patch series lands). The INET-specific logic has been extracted somewhat more thoroughly than previously in netdump(4), into debugnet_inet.c. UDP-layer logic and up, as much as possible as is protocol-independent, remains in debugnet.c. The separation is not perfect and future improvement is welcome. Supporting INET6 is a long-term goal. Much of the diff is "gratuitous" renaming from 'netdump_' or 'nd_' to 'debugnet_' or 'dn_' -- sorry. I thought keeping the netdump name on the generic module would be more confusing than the refactoring. The only functional change here is the mbuf allocation / tracking. Instead of initiating solely on netdump-configured interface(s) at dumpon(8) configuration time, we watch for any debugnet-enabled NIC for link activation and query it for mbuf parameters at that time. If they exceed the existing high-water mark allocation, we re-allocate and track the new high-water mark. Otherwise, we leave the pre-panic mbuf allocation alone. In a future patch in this series, this will allow initiating netdump from panic ddb(4) without pre-panic configuration. No other functional change intended. Reviewed by: markj (earlier version) Some discussion with: emaste, jhb Objection from: marius Differential Revision: https://reviews.freebsd.org/D21421
2019-10-17 16:23:03 +00:00
while ((m = mbufq_dequeue(&dn_mbufq)) != NULL)
Add an mbuf allocator for netdump. The aim is to permit mbuf allocations after a panic without calling into the page allocator, without imposing any runtime overhead during regular operation of the system, and without modifying driver code. The approach taken is to preallocate a number of mbufs and clusters, storing them in linked lists, and using the lists to back some UMA cache zones. At panic time, the mbuf and cluster zone pointers are overwritten with those of the cache zones so that the mbuf allocator returns preallocated items. Using this scheme, drivers which cache mbuf zone pointers from m_getzone() require special handling when implementing netdump support. Reviewed by: cem (earlier version), julian, sbruno MFC after: 1 month Sponsored by: Dell EMC Isilon Differential Revision: https://reviews.freebsd.org/D15251
2018-05-06 00:19:48 +00:00
m_free(m);
Split out a more generic debugnet(4) from netdump(4) Debugnet is a simplistic and specialized panic- or debug-time reliable datagram transport. It can drive a single connection at a time and is currently unidirectional (debug/panic machine transmit to remote server only). It is mostly a verbatim code lift from netdump(4). Netdump(4) remains the only consumer (until the rest of this patch series lands). The INET-specific logic has been extracted somewhat more thoroughly than previously in netdump(4), into debugnet_inet.c. UDP-layer logic and up, as much as possible as is protocol-independent, remains in debugnet.c. The separation is not perfect and future improvement is welcome. Supporting INET6 is a long-term goal. Much of the diff is "gratuitous" renaming from 'netdump_' or 'nd_' to 'debugnet_' or 'dn_' -- sorry. I thought keeping the netdump name on the generic module would be more confusing than the refactoring. The only functional change here is the mbuf allocation / tracking. Instead of initiating solely on netdump-configured interface(s) at dumpon(8) configuration time, we watch for any debugnet-enabled NIC for link activation and query it for mbuf parameters at that time. If they exceed the existing high-water mark allocation, we re-allocate and track the new high-water mark. Otherwise, we leave the pre-panic mbuf allocation alone. In a future patch in this series, this will allow initiating netdump from panic ddb(4) without pre-panic configuration. No other functional change intended. Reviewed by: markj (earlier version) Some discussion with: emaste, jhb Objection from: marius Differential Revision: https://reviews.freebsd.org/D21421
2019-10-17 16:23:03 +00:00
while ((item = mbufq_dequeue(&dn_clustq)) != NULL)
uma_zfree(m_getzone(dn_clsize), item);
Add an mbuf allocator for netdump. The aim is to permit mbuf allocations after a panic without calling into the page allocator, without imposing any runtime overhead during regular operation of the system, and without modifying driver code. The approach taken is to preallocate a number of mbufs and clusters, storing them in linked lists, and using the lists to back some UMA cache zones. At panic time, the mbuf and cluster zone pointers are overwritten with those of the cache zones so that the mbuf allocator returns preallocated items. Using this scheme, drivers which cache mbuf zone pointers from m_getzone() require special handling when implementing netdump support. Reviewed by: cem (earlier version), julian, sbruno MFC after: 1 month Sponsored by: Dell EMC Isilon Differential Revision: https://reviews.freebsd.org/D15251
2018-05-06 00:19:48 +00:00
}
/*
Split out a more generic debugnet(4) from netdump(4) Debugnet is a simplistic and specialized panic- or debug-time reliable datagram transport. It can drive a single connection at a time and is currently unidirectional (debug/panic machine transmit to remote server only). It is mostly a verbatim code lift from netdump(4). Netdump(4) remains the only consumer (until the rest of this patch series lands). The INET-specific logic has been extracted somewhat more thoroughly than previously in netdump(4), into debugnet_inet.c. UDP-layer logic and up, as much as possible as is protocol-independent, remains in debugnet.c. The separation is not perfect and future improvement is welcome. Supporting INET6 is a long-term goal. Much of the diff is "gratuitous" renaming from 'netdump_' or 'nd_' to 'debugnet_' or 'dn_' -- sorry. I thought keeping the netdump name on the generic module would be more confusing than the refactoring. The only functional change here is the mbuf allocation / tracking. Instead of initiating solely on netdump-configured interface(s) at dumpon(8) configuration time, we watch for any debugnet-enabled NIC for link activation and query it for mbuf parameters at that time. If they exceed the existing high-water mark allocation, we re-allocate and track the new high-water mark. Otherwise, we leave the pre-panic mbuf allocation alone. In a future patch in this series, this will allow initiating netdump from panic ddb(4) without pre-panic configuration. No other functional change intended. Reviewed by: markj (earlier version) Some discussion with: emaste, jhb Objection from: marius Differential Revision: https://reviews.freebsd.org/D21421
2019-10-17 16:23:03 +00:00
* Callback invoked immediately prior to starting a debugnet connection.
Add an mbuf allocator for netdump. The aim is to permit mbuf allocations after a panic without calling into the page allocator, without imposing any runtime overhead during regular operation of the system, and without modifying driver code. The approach taken is to preallocate a number of mbufs and clusters, storing them in linked lists, and using the lists to back some UMA cache zones. At panic time, the mbuf and cluster zone pointers are overwritten with those of the cache zones so that the mbuf allocator returns preallocated items. Using this scheme, drivers which cache mbuf zone pointers from m_getzone() require special handling when implementing netdump support. Reviewed by: cem (earlier version), julian, sbruno MFC after: 1 month Sponsored by: Dell EMC Isilon Differential Revision: https://reviews.freebsd.org/D15251
2018-05-06 00:19:48 +00:00
*/
void
Split out a more generic debugnet(4) from netdump(4) Debugnet is a simplistic and specialized panic- or debug-time reliable datagram transport. It can drive a single connection at a time and is currently unidirectional (debug/panic machine transmit to remote server only). It is mostly a verbatim code lift from netdump(4). Netdump(4) remains the only consumer (until the rest of this patch series lands). The INET-specific logic has been extracted somewhat more thoroughly than previously in netdump(4), into debugnet_inet.c. UDP-layer logic and up, as much as possible as is protocol-independent, remains in debugnet.c. The separation is not perfect and future improvement is welcome. Supporting INET6 is a long-term goal. Much of the diff is "gratuitous" renaming from 'netdump_' or 'nd_' to 'debugnet_' or 'dn_' -- sorry. I thought keeping the netdump name on the generic module would be more confusing than the refactoring. The only functional change here is the mbuf allocation / tracking. Instead of initiating solely on netdump-configured interface(s) at dumpon(8) configuration time, we watch for any debugnet-enabled NIC for link activation and query it for mbuf parameters at that time. If they exceed the existing high-water mark allocation, we re-allocate and track the new high-water mark. Otherwise, we leave the pre-panic mbuf allocation alone. In a future patch in this series, this will allow initiating netdump from panic ddb(4) without pre-panic configuration. No other functional change intended. Reviewed by: markj (earlier version) Some discussion with: emaste, jhb Objection from: marius Differential Revision: https://reviews.freebsd.org/D21421
2019-10-17 16:23:03 +00:00
debugnet_mbuf_start(void)
Add an mbuf allocator for netdump. The aim is to permit mbuf allocations after a panic without calling into the page allocator, without imposing any runtime overhead during regular operation of the system, and without modifying driver code. The approach taken is to preallocate a number of mbufs and clusters, storing them in linked lists, and using the lists to back some UMA cache zones. At panic time, the mbuf and cluster zone pointers are overwritten with those of the cache zones so that the mbuf allocator returns preallocated items. Using this scheme, drivers which cache mbuf zone pointers from m_getzone() require special handling when implementing netdump support. Reviewed by: cem (earlier version), julian, sbruno MFC after: 1 month Sponsored by: Dell EMC Isilon Differential Revision: https://reviews.freebsd.org/D15251
2018-05-06 00:19:48 +00:00
{
Split out a more generic debugnet(4) from netdump(4) Debugnet is a simplistic and specialized panic- or debug-time reliable datagram transport. It can drive a single connection at a time and is currently unidirectional (debug/panic machine transmit to remote server only). It is mostly a verbatim code lift from netdump(4). Netdump(4) remains the only consumer (until the rest of this patch series lands). The INET-specific logic has been extracted somewhat more thoroughly than previously in netdump(4), into debugnet_inet.c. UDP-layer logic and up, as much as possible as is protocol-independent, remains in debugnet.c. The separation is not perfect and future improvement is welcome. Supporting INET6 is a long-term goal. Much of the diff is "gratuitous" renaming from 'netdump_' or 'nd_' to 'debugnet_' or 'dn_' -- sorry. I thought keeping the netdump name on the generic module would be more confusing than the refactoring. The only functional change here is the mbuf allocation / tracking. Instead of initiating solely on netdump-configured interface(s) at dumpon(8) configuration time, we watch for any debugnet-enabled NIC for link activation and query it for mbuf parameters at that time. If they exceed the existing high-water mark allocation, we re-allocate and track the new high-water mark. Otherwise, we leave the pre-panic mbuf allocation alone. In a future patch in this series, this will allow initiating netdump from panic ddb(4) without pre-panic configuration. No other functional change intended. Reviewed by: markj (earlier version) Some discussion with: emaste, jhb Objection from: marius Differential Revision: https://reviews.freebsd.org/D21421
2019-10-17 16:23:03 +00:00
MPASS(!dn_saved_zones.dsz_debugnet_zones_enabled);
/* Save the old zone pointers to restore when debugnet is closed. */
dn_saved_zones = (struct debugnet_saved_zones) {
.dsz_debugnet_zones_enabled = true,
.dsz_mbuf = zone_mbuf,
.dsz_clust = zone_clust,
.dsz_pack = zone_pack,
.dsz_jumbop = zone_jumbop,
.dsz_jumbo9 = zone_jumbo9,
.dsz_jumbo16 = zone_jumbo16,
};
Add an mbuf allocator for netdump. The aim is to permit mbuf allocations after a panic without calling into the page allocator, without imposing any runtime overhead during regular operation of the system, and without modifying driver code. The approach taken is to preallocate a number of mbufs and clusters, storing them in linked lists, and using the lists to back some UMA cache zones. At panic time, the mbuf and cluster zone pointers are overwritten with those of the cache zones so that the mbuf allocator returns preallocated items. Using this scheme, drivers which cache mbuf zone pointers from m_getzone() require special handling when implementing netdump support. Reviewed by: cem (earlier version), julian, sbruno MFC after: 1 month Sponsored by: Dell EMC Isilon Differential Revision: https://reviews.freebsd.org/D15251
2018-05-06 00:19:48 +00:00
/*
* All cluster zones return buffers of the size requested by the
* drivers. It's up to the driver to reinitialize the zones if the
Split out a more generic debugnet(4) from netdump(4) Debugnet is a simplistic and specialized panic- or debug-time reliable datagram transport. It can drive a single connection at a time and is currently unidirectional (debug/panic machine transmit to remote server only). It is mostly a verbatim code lift from netdump(4). Netdump(4) remains the only consumer (until the rest of this patch series lands). The INET-specific logic has been extracted somewhat more thoroughly than previously in netdump(4), into debugnet_inet.c. UDP-layer logic and up, as much as possible as is protocol-independent, remains in debugnet.c. The separation is not perfect and future improvement is welcome. Supporting INET6 is a long-term goal. Much of the diff is "gratuitous" renaming from 'netdump_' or 'nd_' to 'debugnet_' or 'dn_' -- sorry. I thought keeping the netdump name on the generic module would be more confusing than the refactoring. The only functional change here is the mbuf allocation / tracking. Instead of initiating solely on netdump-configured interface(s) at dumpon(8) configuration time, we watch for any debugnet-enabled NIC for link activation and query it for mbuf parameters at that time. If they exceed the existing high-water mark allocation, we re-allocate and track the new high-water mark. Otherwise, we leave the pre-panic mbuf allocation alone. In a future patch in this series, this will allow initiating netdump from panic ddb(4) without pre-panic configuration. No other functional change intended. Reviewed by: markj (earlier version) Some discussion with: emaste, jhb Objection from: marius Differential Revision: https://reviews.freebsd.org/D21421
2019-10-17 16:23:03 +00:00
* MTU of a debugnet-enabled interface changes.
Add an mbuf allocator for netdump. The aim is to permit mbuf allocations after a panic without calling into the page allocator, without imposing any runtime overhead during regular operation of the system, and without modifying driver code. The approach taken is to preallocate a number of mbufs and clusters, storing them in linked lists, and using the lists to back some UMA cache zones. At panic time, the mbuf and cluster zone pointers are overwritten with those of the cache zones so that the mbuf allocator returns preallocated items. Using this scheme, drivers which cache mbuf zone pointers from m_getzone() require special handling when implementing netdump support. Reviewed by: cem (earlier version), julian, sbruno MFC after: 1 month Sponsored by: Dell EMC Isilon Differential Revision: https://reviews.freebsd.org/D15251
2018-05-06 00:19:48 +00:00
*/
Split out a more generic debugnet(4) from netdump(4) Debugnet is a simplistic and specialized panic- or debug-time reliable datagram transport. It can drive a single connection at a time and is currently unidirectional (debug/panic machine transmit to remote server only). It is mostly a verbatim code lift from netdump(4). Netdump(4) remains the only consumer (until the rest of this patch series lands). The INET-specific logic has been extracted somewhat more thoroughly than previously in netdump(4), into debugnet_inet.c. UDP-layer logic and up, as much as possible as is protocol-independent, remains in debugnet.c. The separation is not perfect and future improvement is welcome. Supporting INET6 is a long-term goal. Much of the diff is "gratuitous" renaming from 'netdump_' or 'nd_' to 'debugnet_' or 'dn_' -- sorry. I thought keeping the netdump name on the generic module would be more confusing than the refactoring. The only functional change here is the mbuf allocation / tracking. Instead of initiating solely on netdump-configured interface(s) at dumpon(8) configuration time, we watch for any debugnet-enabled NIC for link activation and query it for mbuf parameters at that time. If they exceed the existing high-water mark allocation, we re-allocate and track the new high-water mark. Otherwise, we leave the pre-panic mbuf allocation alone. In a future patch in this series, this will allow initiating netdump from panic ddb(4) without pre-panic configuration. No other functional change intended. Reviewed by: markj (earlier version) Some discussion with: emaste, jhb Objection from: marius Differential Revision: https://reviews.freebsd.org/D21421
2019-10-17 16:23:03 +00:00
printf("debugnet: overwriting mbuf zone pointers\n");
zone_mbuf = dn_zone_mbuf;
zone_clust = dn_zone_clust;
zone_pack = dn_zone_pack;
zone_jumbop = dn_zone_clust;
zone_jumbo9 = dn_zone_clust;
zone_jumbo16 = dn_zone_clust;
}
/*
* Callback invoked when a debugnet connection is closed/finished.
*/
void
debugnet_mbuf_finish(void)
{
MPASS(dn_saved_zones.dsz_debugnet_zones_enabled);
printf("debugnet: restoring mbuf zone pointers\n");
zone_mbuf = dn_saved_zones.dsz_mbuf;
zone_clust = dn_saved_zones.dsz_clust;
zone_pack = dn_saved_zones.dsz_pack;
zone_jumbop = dn_saved_zones.dsz_jumbop;
zone_jumbo9 = dn_saved_zones.dsz_jumbo9;
zone_jumbo16 = dn_saved_zones.dsz_jumbo16;
memset(&dn_saved_zones, 0, sizeof(dn_saved_zones));
Add an mbuf allocator for netdump. The aim is to permit mbuf allocations after a panic without calling into the page allocator, without imposing any runtime overhead during regular operation of the system, and without modifying driver code. The approach taken is to preallocate a number of mbufs and clusters, storing them in linked lists, and using the lists to back some UMA cache zones. At panic time, the mbuf and cluster zone pointers are overwritten with those of the cache zones so that the mbuf allocator returns preallocated items. Using this scheme, drivers which cache mbuf zone pointers from m_getzone() require special handling when implementing netdump support. Reviewed by: cem (earlier version), julian, sbruno MFC after: 1 month Sponsored by: Dell EMC Isilon Differential Revision: https://reviews.freebsd.org/D15251
2018-05-06 00:19:48 +00:00
}
/*
Split out a more generic debugnet(4) from netdump(4) Debugnet is a simplistic and specialized panic- or debug-time reliable datagram transport. It can drive a single connection at a time and is currently unidirectional (debug/panic machine transmit to remote server only). It is mostly a verbatim code lift from netdump(4). Netdump(4) remains the only consumer (until the rest of this patch series lands). The INET-specific logic has been extracted somewhat more thoroughly than previously in netdump(4), into debugnet_inet.c. UDP-layer logic and up, as much as possible as is protocol-independent, remains in debugnet.c. The separation is not perfect and future improvement is welcome. Supporting INET6 is a long-term goal. Much of the diff is "gratuitous" renaming from 'netdump_' or 'nd_' to 'debugnet_' or 'dn_' -- sorry. I thought keeping the netdump name on the generic module would be more confusing than the refactoring. The only functional change here is the mbuf allocation / tracking. Instead of initiating solely on netdump-configured interface(s) at dumpon(8) configuration time, we watch for any debugnet-enabled NIC for link activation and query it for mbuf parameters at that time. If they exceed the existing high-water mark allocation, we re-allocate and track the new high-water mark. Otherwise, we leave the pre-panic mbuf allocation alone. In a future patch in this series, this will allow initiating netdump from panic ddb(4) without pre-panic configuration. No other functional change intended. Reviewed by: markj (earlier version) Some discussion with: emaste, jhb Objection from: marius Differential Revision: https://reviews.freebsd.org/D21421
2019-10-17 16:23:03 +00:00
* Reinitialize the debugnet mbuf+cluster pool and cache zones.
Add an mbuf allocator for netdump. The aim is to permit mbuf allocations after a panic without calling into the page allocator, without imposing any runtime overhead during regular operation of the system, and without modifying driver code. The approach taken is to preallocate a number of mbufs and clusters, storing them in linked lists, and using the lists to back some UMA cache zones. At panic time, the mbuf and cluster zone pointers are overwritten with those of the cache zones so that the mbuf allocator returns preallocated items. Using this scheme, drivers which cache mbuf zone pointers from m_getzone() require special handling when implementing netdump support. Reviewed by: cem (earlier version), julian, sbruno MFC after: 1 month Sponsored by: Dell EMC Isilon Differential Revision: https://reviews.freebsd.org/D15251
2018-05-06 00:19:48 +00:00
*/
void
Split out a more generic debugnet(4) from netdump(4) Debugnet is a simplistic and specialized panic- or debug-time reliable datagram transport. It can drive a single connection at a time and is currently unidirectional (debug/panic machine transmit to remote server only). It is mostly a verbatim code lift from netdump(4). Netdump(4) remains the only consumer (until the rest of this patch series lands). The INET-specific logic has been extracted somewhat more thoroughly than previously in netdump(4), into debugnet_inet.c. UDP-layer logic and up, as much as possible as is protocol-independent, remains in debugnet.c. The separation is not perfect and future improvement is welcome. Supporting INET6 is a long-term goal. Much of the diff is "gratuitous" renaming from 'netdump_' or 'nd_' to 'debugnet_' or 'dn_' -- sorry. I thought keeping the netdump name on the generic module would be more confusing than the refactoring. The only functional change here is the mbuf allocation / tracking. Instead of initiating solely on netdump-configured interface(s) at dumpon(8) configuration time, we watch for any debugnet-enabled NIC for link activation and query it for mbuf parameters at that time. If they exceed the existing high-water mark allocation, we re-allocate and track the new high-water mark. Otherwise, we leave the pre-panic mbuf allocation alone. In a future patch in this series, this will allow initiating netdump from panic ddb(4) without pre-panic configuration. No other functional change intended. Reviewed by: markj (earlier version) Some discussion with: emaste, jhb Objection from: marius Differential Revision: https://reviews.freebsd.org/D21421
2019-10-17 16:23:03 +00:00
debugnet_mbuf_reinit(int nmbuf, int nclust, int clsize)
Add an mbuf allocator for netdump. The aim is to permit mbuf allocations after a panic without calling into the page allocator, without imposing any runtime overhead during regular operation of the system, and without modifying driver code. The approach taken is to preallocate a number of mbufs and clusters, storing them in linked lists, and using the lists to back some UMA cache zones. At panic time, the mbuf and cluster zone pointers are overwritten with those of the cache zones so that the mbuf allocator returns preallocated items. Using this scheme, drivers which cache mbuf zone pointers from m_getzone() require special handling when implementing netdump support. Reviewed by: cem (earlier version), julian, sbruno MFC after: 1 month Sponsored by: Dell EMC Isilon Differential Revision: https://reviews.freebsd.org/D15251
2018-05-06 00:19:48 +00:00
{
struct mbuf *m;
void *item;
Split out a more generic debugnet(4) from netdump(4) Debugnet is a simplistic and specialized panic- or debug-time reliable datagram transport. It can drive a single connection at a time and is currently unidirectional (debug/panic machine transmit to remote server only). It is mostly a verbatim code lift from netdump(4). Netdump(4) remains the only consumer (until the rest of this patch series lands). The INET-specific logic has been extracted somewhat more thoroughly than previously in netdump(4), into debugnet_inet.c. UDP-layer logic and up, as much as possible as is protocol-independent, remains in debugnet.c. The separation is not perfect and future improvement is welcome. Supporting INET6 is a long-term goal. Much of the diff is "gratuitous" renaming from 'netdump_' or 'nd_' to 'debugnet_' or 'dn_' -- sorry. I thought keeping the netdump name on the generic module would be more confusing than the refactoring. The only functional change here is the mbuf allocation / tracking. Instead of initiating solely on netdump-configured interface(s) at dumpon(8) configuration time, we watch for any debugnet-enabled NIC for link activation and query it for mbuf parameters at that time. If they exceed the existing high-water mark allocation, we re-allocate and track the new high-water mark. Otherwise, we leave the pre-panic mbuf allocation alone. In a future patch in this series, this will allow initiating netdump from panic ddb(4) without pre-panic configuration. No other functional change intended. Reviewed by: markj (earlier version) Some discussion with: emaste, jhb Objection from: marius Differential Revision: https://reviews.freebsd.org/D21421
2019-10-17 16:23:03 +00:00
debugnet_mbuf_drain();
Add an mbuf allocator for netdump. The aim is to permit mbuf allocations after a panic without calling into the page allocator, without imposing any runtime overhead during regular operation of the system, and without modifying driver code. The approach taken is to preallocate a number of mbufs and clusters, storing them in linked lists, and using the lists to back some UMA cache zones. At panic time, the mbuf and cluster zone pointers are overwritten with those of the cache zones so that the mbuf allocator returns preallocated items. Using this scheme, drivers which cache mbuf zone pointers from m_getzone() require special handling when implementing netdump support. Reviewed by: cem (earlier version), julian, sbruno MFC after: 1 month Sponsored by: Dell EMC Isilon Differential Revision: https://reviews.freebsd.org/D15251
2018-05-06 00:19:48 +00:00
Split out a more generic debugnet(4) from netdump(4) Debugnet is a simplistic and specialized panic- or debug-time reliable datagram transport. It can drive a single connection at a time and is currently unidirectional (debug/panic machine transmit to remote server only). It is mostly a verbatim code lift from netdump(4). Netdump(4) remains the only consumer (until the rest of this patch series lands). The INET-specific logic has been extracted somewhat more thoroughly than previously in netdump(4), into debugnet_inet.c. UDP-layer logic and up, as much as possible as is protocol-independent, remains in debugnet.c. The separation is not perfect and future improvement is welcome. Supporting INET6 is a long-term goal. Much of the diff is "gratuitous" renaming from 'netdump_' or 'nd_' to 'debugnet_' or 'dn_' -- sorry. I thought keeping the netdump name on the generic module would be more confusing than the refactoring. The only functional change here is the mbuf allocation / tracking. Instead of initiating solely on netdump-configured interface(s) at dumpon(8) configuration time, we watch for any debugnet-enabled NIC for link activation and query it for mbuf parameters at that time. If they exceed the existing high-water mark allocation, we re-allocate and track the new high-water mark. Otherwise, we leave the pre-panic mbuf allocation alone. In a future patch in this series, this will allow initiating netdump from panic ddb(4) without pre-panic configuration. No other functional change intended. Reviewed by: markj (earlier version) Some discussion with: emaste, jhb Objection from: marius Differential Revision: https://reviews.freebsd.org/D21421
2019-10-17 16:23:03 +00:00
dn_clsize = clsize;
Add an mbuf allocator for netdump. The aim is to permit mbuf allocations after a panic without calling into the page allocator, without imposing any runtime overhead during regular operation of the system, and without modifying driver code. The approach taken is to preallocate a number of mbufs and clusters, storing them in linked lists, and using the lists to back some UMA cache zones. At panic time, the mbuf and cluster zone pointers are overwritten with those of the cache zones so that the mbuf allocator returns preallocated items. Using this scheme, drivers which cache mbuf zone pointers from m_getzone() require special handling when implementing netdump support. Reviewed by: cem (earlier version), julian, sbruno MFC after: 1 month Sponsored by: Dell EMC Isilon Differential Revision: https://reviews.freebsd.org/D15251
2018-05-06 00:19:48 +00:00
Split out a more generic debugnet(4) from netdump(4) Debugnet is a simplistic and specialized panic- or debug-time reliable datagram transport. It can drive a single connection at a time and is currently unidirectional (debug/panic machine transmit to remote server only). It is mostly a verbatim code lift from netdump(4). Netdump(4) remains the only consumer (until the rest of this patch series lands). The INET-specific logic has been extracted somewhat more thoroughly than previously in netdump(4), into debugnet_inet.c. UDP-layer logic and up, as much as possible as is protocol-independent, remains in debugnet.c. The separation is not perfect and future improvement is welcome. Supporting INET6 is a long-term goal. Much of the diff is "gratuitous" renaming from 'netdump_' or 'nd_' to 'debugnet_' or 'dn_' -- sorry. I thought keeping the netdump name on the generic module would be more confusing than the refactoring. The only functional change here is the mbuf allocation / tracking. Instead of initiating solely on netdump-configured interface(s) at dumpon(8) configuration time, we watch for any debugnet-enabled NIC for link activation and query it for mbuf parameters at that time. If they exceed the existing high-water mark allocation, we re-allocate and track the new high-water mark. Otherwise, we leave the pre-panic mbuf allocation alone. In a future patch in this series, this will allow initiating netdump from panic ddb(4) without pre-panic configuration. No other functional change intended. Reviewed by: markj (earlier version) Some discussion with: emaste, jhb Objection from: marius Differential Revision: https://reviews.freebsd.org/D21421
2019-10-17 16:23:03 +00:00
dn_zone_mbuf = uma_zcache_create("debugnet_" MBUF_MEM_NAME,
mbuf zones: take out the trash The mbuf zones were explicitly specifying the uma trash procedures on zcreate, conditionally on INVARIANTS, because that used to be necessary in order to get use-after-free checking for uma zones with non-empty constructors or destructors. After r355137 uma automatically invokes the trash constructor and destructor as long as no init and fini are specified. This now allows the mbuf zones to pass their constructors and destructors without needing to add on the uma trash procedures conditionally. Reviewed by: cem, jhb, markj Sponsored by: Dell EMC Isilon Differential Revision: https://reviews.freebsd.org/D22583
2019-12-04 18:21:29 +00:00
MSIZE, mb_ctor_mbuf, mb_dtor_mbuf, NULL, NULL,
Split out a more generic debugnet(4) from netdump(4) Debugnet is a simplistic and specialized panic- or debug-time reliable datagram transport. It can drive a single connection at a time and is currently unidirectional (debug/panic machine transmit to remote server only). It is mostly a verbatim code lift from netdump(4). Netdump(4) remains the only consumer (until the rest of this patch series lands). The INET-specific logic has been extracted somewhat more thoroughly than previously in netdump(4), into debugnet_inet.c. UDP-layer logic and up, as much as possible as is protocol-independent, remains in debugnet.c. The separation is not perfect and future improvement is welcome. Supporting INET6 is a long-term goal. Much of the diff is "gratuitous" renaming from 'netdump_' or 'nd_' to 'debugnet_' or 'dn_' -- sorry. I thought keeping the netdump name on the generic module would be more confusing than the refactoring. The only functional change here is the mbuf allocation / tracking. Instead of initiating solely on netdump-configured interface(s) at dumpon(8) configuration time, we watch for any debugnet-enabled NIC for link activation and query it for mbuf parameters at that time. If they exceed the existing high-water mark allocation, we re-allocate and track the new high-water mark. Otherwise, we leave the pre-panic mbuf allocation alone. In a future patch in this series, this will allow initiating netdump from panic ddb(4) without pre-panic configuration. No other functional change intended. Reviewed by: markj (earlier version) Some discussion with: emaste, jhb Objection from: marius Differential Revision: https://reviews.freebsd.org/D21421
2019-10-17 16:23:03 +00:00
dn_buf_import, dn_buf_release,
&dn_mbufq, UMA_ZONE_NOBUCKET);
Add an mbuf allocator for netdump. The aim is to permit mbuf allocations after a panic without calling into the page allocator, without imposing any runtime overhead during regular operation of the system, and without modifying driver code. The approach taken is to preallocate a number of mbufs and clusters, storing them in linked lists, and using the lists to back some UMA cache zones. At panic time, the mbuf and cluster zone pointers are overwritten with those of the cache zones so that the mbuf allocator returns preallocated items. Using this scheme, drivers which cache mbuf zone pointers from m_getzone() require special handling when implementing netdump support. Reviewed by: cem (earlier version), julian, sbruno MFC after: 1 month Sponsored by: Dell EMC Isilon Differential Revision: https://reviews.freebsd.org/D15251
2018-05-06 00:19:48 +00:00
Split out a more generic debugnet(4) from netdump(4) Debugnet is a simplistic and specialized panic- or debug-time reliable datagram transport. It can drive a single connection at a time and is currently unidirectional (debug/panic machine transmit to remote server only). It is mostly a verbatim code lift from netdump(4). Netdump(4) remains the only consumer (until the rest of this patch series lands). The INET-specific logic has been extracted somewhat more thoroughly than previously in netdump(4), into debugnet_inet.c. UDP-layer logic and up, as much as possible as is protocol-independent, remains in debugnet.c. The separation is not perfect and future improvement is welcome. Supporting INET6 is a long-term goal. Much of the diff is "gratuitous" renaming from 'netdump_' or 'nd_' to 'debugnet_' or 'dn_' -- sorry. I thought keeping the netdump name on the generic module would be more confusing than the refactoring. The only functional change here is the mbuf allocation / tracking. Instead of initiating solely on netdump-configured interface(s) at dumpon(8) configuration time, we watch for any debugnet-enabled NIC for link activation and query it for mbuf parameters at that time. If they exceed the existing high-water mark allocation, we re-allocate and track the new high-water mark. Otherwise, we leave the pre-panic mbuf allocation alone. In a future patch in this series, this will allow initiating netdump from panic ddb(4) without pre-panic configuration. No other functional change intended. Reviewed by: markj (earlier version) Some discussion with: emaste, jhb Objection from: marius Differential Revision: https://reviews.freebsd.org/D21421
2019-10-17 16:23:03 +00:00
dn_zone_clust = uma_zcache_create("debugnet_" MBUF_CLUSTER_MEM_NAME,
mbuf zones: take out the trash The mbuf zones were explicitly specifying the uma trash procedures on zcreate, conditionally on INVARIANTS, because that used to be necessary in order to get use-after-free checking for uma zones with non-empty constructors or destructors. After r355137 uma automatically invokes the trash constructor and destructor as long as no init and fini are specified. This now allows the mbuf zones to pass their constructors and destructors without needing to add on the uma trash procedures conditionally. Reviewed by: cem, jhb, markj Sponsored by: Dell EMC Isilon Differential Revision: https://reviews.freebsd.org/D22583
2019-12-04 18:21:29 +00:00
clsize, mb_ctor_clust, NULL, NULL, NULL,
Split out a more generic debugnet(4) from netdump(4) Debugnet is a simplistic and specialized panic- or debug-time reliable datagram transport. It can drive a single connection at a time and is currently unidirectional (debug/panic machine transmit to remote server only). It is mostly a verbatim code lift from netdump(4). Netdump(4) remains the only consumer (until the rest of this patch series lands). The INET-specific logic has been extracted somewhat more thoroughly than previously in netdump(4), into debugnet_inet.c. UDP-layer logic and up, as much as possible as is protocol-independent, remains in debugnet.c. The separation is not perfect and future improvement is welcome. Supporting INET6 is a long-term goal. Much of the diff is "gratuitous" renaming from 'netdump_' or 'nd_' to 'debugnet_' or 'dn_' -- sorry. I thought keeping the netdump name on the generic module would be more confusing than the refactoring. The only functional change here is the mbuf allocation / tracking. Instead of initiating solely on netdump-configured interface(s) at dumpon(8) configuration time, we watch for any debugnet-enabled NIC for link activation and query it for mbuf parameters at that time. If they exceed the existing high-water mark allocation, we re-allocate and track the new high-water mark. Otherwise, we leave the pre-panic mbuf allocation alone. In a future patch in this series, this will allow initiating netdump from panic ddb(4) without pre-panic configuration. No other functional change intended. Reviewed by: markj (earlier version) Some discussion with: emaste, jhb Objection from: marius Differential Revision: https://reviews.freebsd.org/D21421
2019-10-17 16:23:03 +00:00
dn_buf_import, dn_buf_release,
&dn_clustq, UMA_ZONE_NOBUCKET);
Add an mbuf allocator for netdump. The aim is to permit mbuf allocations after a panic without calling into the page allocator, without imposing any runtime overhead during regular operation of the system, and without modifying driver code. The approach taken is to preallocate a number of mbufs and clusters, storing them in linked lists, and using the lists to back some UMA cache zones. At panic time, the mbuf and cluster zone pointers are overwritten with those of the cache zones so that the mbuf allocator returns preallocated items. Using this scheme, drivers which cache mbuf zone pointers from m_getzone() require special handling when implementing netdump support. Reviewed by: cem (earlier version), julian, sbruno MFC after: 1 month Sponsored by: Dell EMC Isilon Differential Revision: https://reviews.freebsd.org/D15251
2018-05-06 00:19:48 +00:00
Split out a more generic debugnet(4) from netdump(4) Debugnet is a simplistic and specialized panic- or debug-time reliable datagram transport. It can drive a single connection at a time and is currently unidirectional (debug/panic machine transmit to remote server only). It is mostly a verbatim code lift from netdump(4). Netdump(4) remains the only consumer (until the rest of this patch series lands). The INET-specific logic has been extracted somewhat more thoroughly than previously in netdump(4), into debugnet_inet.c. UDP-layer logic and up, as much as possible as is protocol-independent, remains in debugnet.c. The separation is not perfect and future improvement is welcome. Supporting INET6 is a long-term goal. Much of the diff is "gratuitous" renaming from 'netdump_' or 'nd_' to 'debugnet_' or 'dn_' -- sorry. I thought keeping the netdump name on the generic module would be more confusing than the refactoring. The only functional change here is the mbuf allocation / tracking. Instead of initiating solely on netdump-configured interface(s) at dumpon(8) configuration time, we watch for any debugnet-enabled NIC for link activation and query it for mbuf parameters at that time. If they exceed the existing high-water mark allocation, we re-allocate and track the new high-water mark. Otherwise, we leave the pre-panic mbuf allocation alone. In a future patch in this series, this will allow initiating netdump from panic ddb(4) without pre-panic configuration. No other functional change intended. Reviewed by: markj (earlier version) Some discussion with: emaste, jhb Objection from: marius Differential Revision: https://reviews.freebsd.org/D21421
2019-10-17 16:23:03 +00:00
dn_zone_pack = uma_zcache_create("debugnet_" MBUF_PACKET_MEM_NAME,
Add an mbuf allocator for netdump. The aim is to permit mbuf allocations after a panic without calling into the page allocator, without imposing any runtime overhead during regular operation of the system, and without modifying driver code. The approach taken is to preallocate a number of mbufs and clusters, storing them in linked lists, and using the lists to back some UMA cache zones. At panic time, the mbuf and cluster zone pointers are overwritten with those of the cache zones so that the mbuf allocator returns preallocated items. Using this scheme, drivers which cache mbuf zone pointers from m_getzone() require special handling when implementing netdump support. Reviewed by: cem (earlier version), julian, sbruno MFC after: 1 month Sponsored by: Dell EMC Isilon Differential Revision: https://reviews.freebsd.org/D15251
2018-05-06 00:19:48 +00:00
MCLBYTES, mb_ctor_pack, mb_dtor_pack, NULL, NULL,
Split out a more generic debugnet(4) from netdump(4) Debugnet is a simplistic and specialized panic- or debug-time reliable datagram transport. It can drive a single connection at a time and is currently unidirectional (debug/panic machine transmit to remote server only). It is mostly a verbatim code lift from netdump(4). Netdump(4) remains the only consumer (until the rest of this patch series lands). The INET-specific logic has been extracted somewhat more thoroughly than previously in netdump(4), into debugnet_inet.c. UDP-layer logic and up, as much as possible as is protocol-independent, remains in debugnet.c. The separation is not perfect and future improvement is welcome. Supporting INET6 is a long-term goal. Much of the diff is "gratuitous" renaming from 'netdump_' or 'nd_' to 'debugnet_' or 'dn_' -- sorry. I thought keeping the netdump name on the generic module would be more confusing than the refactoring. The only functional change here is the mbuf allocation / tracking. Instead of initiating solely on netdump-configured interface(s) at dumpon(8) configuration time, we watch for any debugnet-enabled NIC for link activation and query it for mbuf parameters at that time. If they exceed the existing high-water mark allocation, we re-allocate and track the new high-water mark. Otherwise, we leave the pre-panic mbuf allocation alone. In a future patch in this series, this will allow initiating netdump from panic ddb(4) without pre-panic configuration. No other functional change intended. Reviewed by: markj (earlier version) Some discussion with: emaste, jhb Objection from: marius Differential Revision: https://reviews.freebsd.org/D21421
2019-10-17 16:23:03 +00:00
dn_pack_import, dn_pack_release,
Add an mbuf allocator for netdump. The aim is to permit mbuf allocations after a panic without calling into the page allocator, without imposing any runtime overhead during regular operation of the system, and without modifying driver code. The approach taken is to preallocate a number of mbufs and clusters, storing them in linked lists, and using the lists to back some UMA cache zones. At panic time, the mbuf and cluster zone pointers are overwritten with those of the cache zones so that the mbuf allocator returns preallocated items. Using this scheme, drivers which cache mbuf zone pointers from m_getzone() require special handling when implementing netdump support. Reviewed by: cem (earlier version), julian, sbruno MFC after: 1 month Sponsored by: Dell EMC Isilon Differential Revision: https://reviews.freebsd.org/D15251
2018-05-06 00:19:48 +00:00
NULL, UMA_ZONE_NOBUCKET);
while (nmbuf-- > 0) {
m = m_get(MT_DATA, M_WAITOK);
Split out a more generic debugnet(4) from netdump(4) Debugnet is a simplistic and specialized panic- or debug-time reliable datagram transport. It can drive a single connection at a time and is currently unidirectional (debug/panic machine transmit to remote server only). It is mostly a verbatim code lift from netdump(4). Netdump(4) remains the only consumer (until the rest of this patch series lands). The INET-specific logic has been extracted somewhat more thoroughly than previously in netdump(4), into debugnet_inet.c. UDP-layer logic and up, as much as possible as is protocol-independent, remains in debugnet.c. The separation is not perfect and future improvement is welcome. Supporting INET6 is a long-term goal. Much of the diff is "gratuitous" renaming from 'netdump_' or 'nd_' to 'debugnet_' or 'dn_' -- sorry. I thought keeping the netdump name on the generic module would be more confusing than the refactoring. The only functional change here is the mbuf allocation / tracking. Instead of initiating solely on netdump-configured interface(s) at dumpon(8) configuration time, we watch for any debugnet-enabled NIC for link activation and query it for mbuf parameters at that time. If they exceed the existing high-water mark allocation, we re-allocate and track the new high-water mark. Otherwise, we leave the pre-panic mbuf allocation alone. In a future patch in this series, this will allow initiating netdump from panic ddb(4) without pre-panic configuration. No other functional change intended. Reviewed by: markj (earlier version) Some discussion with: emaste, jhb Objection from: marius Differential Revision: https://reviews.freebsd.org/D21421
2019-10-17 16:23:03 +00:00
uma_zfree(dn_zone_mbuf, m);
Add an mbuf allocator for netdump. The aim is to permit mbuf allocations after a panic without calling into the page allocator, without imposing any runtime overhead during regular operation of the system, and without modifying driver code. The approach taken is to preallocate a number of mbufs and clusters, storing them in linked lists, and using the lists to back some UMA cache zones. At panic time, the mbuf and cluster zone pointers are overwritten with those of the cache zones so that the mbuf allocator returns preallocated items. Using this scheme, drivers which cache mbuf zone pointers from m_getzone() require special handling when implementing netdump support. Reviewed by: cem (earlier version), julian, sbruno MFC after: 1 month Sponsored by: Dell EMC Isilon Differential Revision: https://reviews.freebsd.org/D15251
2018-05-06 00:19:48 +00:00
}
while (nclust-- > 0) {
Split out a more generic debugnet(4) from netdump(4) Debugnet is a simplistic and specialized panic- or debug-time reliable datagram transport. It can drive a single connection at a time and is currently unidirectional (debug/panic machine transmit to remote server only). It is mostly a verbatim code lift from netdump(4). Netdump(4) remains the only consumer (until the rest of this patch series lands). The INET-specific logic has been extracted somewhat more thoroughly than previously in netdump(4), into debugnet_inet.c. UDP-layer logic and up, as much as possible as is protocol-independent, remains in debugnet.c. The separation is not perfect and future improvement is welcome. Supporting INET6 is a long-term goal. Much of the diff is "gratuitous" renaming from 'netdump_' or 'nd_' to 'debugnet_' or 'dn_' -- sorry. I thought keeping the netdump name on the generic module would be more confusing than the refactoring. The only functional change here is the mbuf allocation / tracking. Instead of initiating solely on netdump-configured interface(s) at dumpon(8) configuration time, we watch for any debugnet-enabled NIC for link activation and query it for mbuf parameters at that time. If they exceed the existing high-water mark allocation, we re-allocate and track the new high-water mark. Otherwise, we leave the pre-panic mbuf allocation alone. In a future patch in this series, this will allow initiating netdump from panic ddb(4) without pre-panic configuration. No other functional change intended. Reviewed by: markj (earlier version) Some discussion with: emaste, jhb Objection from: marius Differential Revision: https://reviews.freebsd.org/D21421
2019-10-17 16:23:03 +00:00
item = uma_zalloc(m_getzone(dn_clsize), M_WAITOK);
uma_zfree(dn_zone_clust, item);
Add an mbuf allocator for netdump. The aim is to permit mbuf allocations after a panic without calling into the page allocator, without imposing any runtime overhead during regular operation of the system, and without modifying driver code. The approach taken is to preallocate a number of mbufs and clusters, storing them in linked lists, and using the lists to back some UMA cache zones. At panic time, the mbuf and cluster zone pointers are overwritten with those of the cache zones so that the mbuf allocator returns preallocated items. Using this scheme, drivers which cache mbuf zone pointers from m_getzone() require special handling when implementing netdump support. Reviewed by: cem (earlier version), julian, sbruno MFC after: 1 month Sponsored by: Dell EMC Isilon Differential Revision: https://reviews.freebsd.org/D15251
2018-05-06 00:19:48 +00:00
}
}
Split out a more generic debugnet(4) from netdump(4) Debugnet is a simplistic and specialized panic- or debug-time reliable datagram transport. It can drive a single connection at a time and is currently unidirectional (debug/panic machine transmit to remote server only). It is mostly a verbatim code lift from netdump(4). Netdump(4) remains the only consumer (until the rest of this patch series lands). The INET-specific logic has been extracted somewhat more thoroughly than previously in netdump(4), into debugnet_inet.c. UDP-layer logic and up, as much as possible as is protocol-independent, remains in debugnet.c. The separation is not perfect and future improvement is welcome. Supporting INET6 is a long-term goal. Much of the diff is "gratuitous" renaming from 'netdump_' or 'nd_' to 'debugnet_' or 'dn_' -- sorry. I thought keeping the netdump name on the generic module would be more confusing than the refactoring. The only functional change here is the mbuf allocation / tracking. Instead of initiating solely on netdump-configured interface(s) at dumpon(8) configuration time, we watch for any debugnet-enabled NIC for link activation and query it for mbuf parameters at that time. If they exceed the existing high-water mark allocation, we re-allocate and track the new high-water mark. Otherwise, we leave the pre-panic mbuf allocation alone. In a future patch in this series, this will allow initiating netdump from panic ddb(4) without pre-panic configuration. No other functional change intended. Reviewed by: markj (earlier version) Some discussion with: emaste, jhb Objection from: marius Differential Revision: https://reviews.freebsd.org/D21421
2019-10-17 16:23:03 +00:00
#endif /* DEBUGNET */
Add an mbuf allocator for netdump. The aim is to permit mbuf allocations after a panic without calling into the page allocator, without imposing any runtime overhead during regular operation of the system, and without modifying driver code. The approach taken is to preallocate a number of mbufs and clusters, storing them in linked lists, and using the lists to back some UMA cache zones. At panic time, the mbuf and cluster zone pointers are overwritten with those of the cache zones so that the mbuf allocator returns preallocated items. Using this scheme, drivers which cache mbuf zone pointers from m_getzone() require special handling when implementing netdump support. Reviewed by: cem (earlier version), julian, sbruno MFC after: 1 month Sponsored by: Dell EMC Isilon Differential Revision: https://reviews.freebsd.org/D15251
2018-05-06 00:19:48 +00:00
Bring in mbuma to replace mballoc. mbuma is an Mbuf & Cluster allocator built on top of a number of extensions to the UMA framework, all included herein. Extensions to UMA worth noting: - Better layering between slab <-> zone caches; introduce Keg structure which splits off slab cache away from the zone structure and allows multiple zones to be stacked on top of a single Keg (single type of slab cache); perhaps we should look into defining a subset API on top of the Keg for special use by malloc(9), for example. - UMA_ZONE_REFCNT zones can now be added, and reference counters automagically allocated for them within the end of the associated slab structures. uma_find_refcnt() does a kextract to fetch the slab struct reference from the underlying page, and lookup the corresponding refcnt. mbuma things worth noting: - integrates mbuf & cluster allocations with extended UMA and provides caches for commonly-allocated items; defines several zones (two primary, one secondary) and two kegs. - change up certain code paths that always used to do: m_get() + m_clget() to instead just use m_getcl() and try to take advantage of the newly defined secondary Packet zone. - netstat(1) and systat(1) quickly hacked up to do basic stat reporting but additional stats work needs to be done once some other details within UMA have been taken care of and it becomes clearer to how stats will work within the modified framework. From the user perspective, one implication is that the NMBCLUSTERS compile-time option is no longer used. The maximum number of clusters is still capped off according to maxusers, but it can be made unlimited by setting the kern.ipc.nmbclusters boot-time tunable to zero. Work should be done to write an appropriate sysctl handler allowing dynamic tuning of kern.ipc.nmbclusters at runtime. Additional things worth noting/known issues (READ): - One report of 'ips' (ServeRAID) driver acting really slow in conjunction with mbuma. Need more data. Latest report is that ips is equally sucking with and without mbuma. - Giant leak in NFS code sometimes occurs, can't reproduce but currently analyzing; brueffer is able to reproduce but THIS IS NOT an mbuma-specific problem and currently occurs even WITHOUT mbuma. - Issues in network locking: there is at least one code path in the rip code where one or more locks are acquired and we end up in m_prepend() with M_WAITOK, which causes WITNESS to whine from within UMA. Current temporary solution: force all UMA allocations to be M_NOWAIT from within UMA for now to avoid deadlocks unless WITNESS is defined and we can determine with certainty that we're not holding any locks when we're M_WAITOK. - I've seen at least one weird socketbuffer empty-but- mbuf-still-attached panic. I don't believe this to be related to mbuma but please keep your eyes open, turn on debugging, and capture crash dumps. This change removes more code than it adds. A paper is available detailing the change and considering various performance issues, it was presented at BSDCan2004: http://www.unixdaemons.com/~bmilekic/netbuf_bmilekic.pdf Please read the paper for Future Work and implementation details, as well as credits. Testing and Debugging: rwatson, brueffer, Ketrien I. Saihr-Kesenchedra, ... Reviewed by: Lots of people (for different parts)
2004-05-31 21:46:06 +00:00
/*
Use zone nomenclature that is consistent with UMA.
2020-06-21 04:59:02 +00:00
* Constructor for Mbuf primary zone.
Bring in mbuma to replace mballoc. mbuma is an Mbuf & Cluster allocator built on top of a number of extensions to the UMA framework, all included herein. Extensions to UMA worth noting: - Better layering between slab <-> zone caches; introduce Keg structure which splits off slab cache away from the zone structure and allows multiple zones to be stacked on top of a single Keg (single type of slab cache); perhaps we should look into defining a subset API on top of the Keg for special use by malloc(9), for example. - UMA_ZONE_REFCNT zones can now be added, and reference counters automagically allocated for them within the end of the associated slab structures. uma_find_refcnt() does a kextract to fetch the slab struct reference from the underlying page, and lookup the corresponding refcnt. mbuma things worth noting: - integrates mbuf & cluster allocations with extended UMA and provides caches for commonly-allocated items; defines several zones (two primary, one secondary) and two kegs. - change up certain code paths that always used to do: m_get() + m_clget() to instead just use m_getcl() and try to take advantage of the newly defined secondary Packet zone. - netstat(1) and systat(1) quickly hacked up to do basic stat reporting but additional stats work needs to be done once some other details within UMA have been taken care of and it becomes clearer to how stats will work within the modified framework. From the user perspective, one implication is that the NMBCLUSTERS compile-time option is no longer used. The maximum number of clusters is still capped off according to maxusers, but it can be made unlimited by setting the kern.ipc.nmbclusters boot-time tunable to zero. Work should be done to write an appropriate sysctl handler allowing dynamic tuning of kern.ipc.nmbclusters at runtime. Additional things worth noting/known issues (READ): - One report of 'ips' (ServeRAID) driver acting really slow in conjunction with mbuma. Need more data. Latest report is that ips is equally sucking with and without mbuma. - Giant leak in NFS code sometimes occurs, can't reproduce but currently analyzing; brueffer is able to reproduce but THIS IS NOT an mbuma-specific problem and currently occurs even WITHOUT mbuma. - Issues in network locking: there is at least one code path in the rip code where one or more locks are acquired and we end up in m_prepend() with M_WAITOK, which causes WITNESS to whine from within UMA. Current temporary solution: force all UMA allocations to be M_NOWAIT from within UMA for now to avoid deadlocks unless WITNESS is defined and we can determine with certainty that we're not holding any locks when we're M_WAITOK. - I've seen at least one weird socketbuffer empty-but- mbuf-still-attached panic. I don't believe this to be related to mbuma but please keep your eyes open, turn on debugging, and capture crash dumps. This change removes more code than it adds. A paper is available detailing the change and considering various performance issues, it was presented at BSDCan2004: http://www.unixdaemons.com/~bmilekic/netbuf_bmilekic.pdf Please read the paper for Future Work and implementation details, as well as credits. Testing and Debugging: rwatson, brueffer, Ketrien I. Saihr-Kesenchedra, ... Reviewed by: Lots of people (for different parts)
2004-05-31 21:46:06 +00:00
*
* The 'arg' pointer points to a mb_args structure which
* contains call-specific information required to support the
Mandatory mbuf cluster reference counting and groundwork for UMA based jumbo 9k and jumbo 16k cluster support. All mbuf's with external storage attached are mandatory reference counted. For clusters and jumbo clusters UMA provides the refcnt storage directly. It does not have to be separatly allocated. Any other type of external storage gets its own refcnt allocated from an UMA mbuf refcnt zone instead of normal kernel malloc. The refcount API MEXT_ADD_REF() and MEXT_REM_REF() is no longer publically accessible. The proper m_* functions have to be used. mb_ctor_clust() and mb_dtor_clust() both handle normal 2K as well as 9k and 16k clusters. Clusters and jumbo clusters may be obtained without attaching it immideatly to an mbuf. This is for high performance cluster allocation in network drivers where mbufs are attached after the cluster has been filled. Tested by: rwatson Sponsored by: TCP/IP Optimizations Fundraise 2005
2005-11-02 16:20:36 +00:00
* mbuf allocation API. See mbuf.h.
Bring in mbuma to replace mballoc. mbuma is an Mbuf & Cluster allocator built on top of a number of extensions to the UMA framework, all included herein. Extensions to UMA worth noting: - Better layering between slab <-> zone caches; introduce Keg structure which splits off slab cache away from the zone structure and allows multiple zones to be stacked on top of a single Keg (single type of slab cache); perhaps we should look into defining a subset API on top of the Keg for special use by malloc(9), for example. - UMA_ZONE_REFCNT zones can now be added, and reference counters automagically allocated for them within the end of the associated slab structures. uma_find_refcnt() does a kextract to fetch the slab struct reference from the underlying page, and lookup the corresponding refcnt. mbuma things worth noting: - integrates mbuf & cluster allocations with extended UMA and provides caches for commonly-allocated items; defines several zones (two primary, one secondary) and two kegs. - change up certain code paths that always used to do: m_get() + m_clget() to instead just use m_getcl() and try to take advantage of the newly defined secondary Packet zone. - netstat(1) and systat(1) quickly hacked up to do basic stat reporting but additional stats work needs to be done once some other details within UMA have been taken care of and it becomes clearer to how stats will work within the modified framework. From the user perspective, one implication is that the NMBCLUSTERS compile-time option is no longer used. The maximum number of clusters is still capped off according to maxusers, but it can be made unlimited by setting the kern.ipc.nmbclusters boot-time tunable to zero. Work should be done to write an appropriate sysctl handler allowing dynamic tuning of kern.ipc.nmbclusters at runtime. Additional things worth noting/known issues (READ): - One report of 'ips' (ServeRAID) driver acting really slow in conjunction with mbuma. Need more data. Latest report is that ips is equally sucking with and without mbuma. - Giant leak in NFS code sometimes occurs, can't reproduce but currently analyzing; brueffer is able to reproduce but THIS IS NOT an mbuma-specific problem and currently occurs even WITHOUT mbuma. - Issues in network locking: there is at least one code path in the rip code where one or more locks are acquired and we end up in m_prepend() with M_WAITOK, which causes WITNESS to whine from within UMA. Current temporary solution: force all UMA allocations to be M_NOWAIT from within UMA for now to avoid deadlocks unless WITNESS is defined and we can determine with certainty that we're not holding any locks when we're M_WAITOK. - I've seen at least one weird socketbuffer empty-but- mbuf-still-attached panic. I don't believe this to be related to mbuma but please keep your eyes open, turn on debugging, and capture crash dumps. This change removes more code than it adds. A paper is available detailing the change and considering various performance issues, it was presented at BSDCan2004: http://www.unixdaemons.com/~bmilekic/netbuf_bmilekic.pdf Please read the paper for Future Work and implementation details, as well as credits. Testing and Debugging: rwatson, brueffer, Ketrien I. Saihr-Kesenchedra, ... Reviewed by: Lots of people (for different parts)
2004-05-31 21:46:06 +00:00
*/
* Add a "how" argument to uma_zone constructors and initialization functions so that they know whether the allocation is supposed to be able to sleep or not. * Allow uma_zone constructors and initialation functions to return either success or error. Almost all of the ones in the tree currently return success unconditionally, but mbuf is a notable exception: the packet zone constructor wants to be able to fail if it cannot suballocate an mbuf cluster, and the mbuf allocators want to be able to fail in general in a MAC kernel if the MAC mbuf initializer fails. This fixes the panics people are seeing when they run out of memory for mbuf clusters. * Allow debug.nosleepwithlocks on WITNESS to be disabled, without changing the default. Both bmilekic and jeff have reviewed the changes made to make failable zone allocations work.
2004-08-02 00:18:36 +00:00
static int
mb_ctor_mbuf(void *mem, int size, void *arg, int how)
Bring in mbuma to replace mballoc. mbuma is an Mbuf & Cluster allocator built on top of a number of extensions to the UMA framework, all included herein. Extensions to UMA worth noting: - Better layering between slab <-> zone caches; introduce Keg structure which splits off slab cache away from the zone structure and allows multiple zones to be stacked on top of a single Keg (single type of slab cache); perhaps we should look into defining a subset API on top of the Keg for special use by malloc(9), for example. - UMA_ZONE_REFCNT zones can now be added, and reference counters automagically allocated for them within the end of the associated slab structures. uma_find_refcnt() does a kextract to fetch the slab struct reference from the underlying page, and lookup the corresponding refcnt. mbuma things worth noting: - integrates mbuf & cluster allocations with extended UMA and provides caches for commonly-allocated items; defines several zones (two primary, one secondary) and two kegs. - change up certain code paths that always used to do: m_get() + m_clget() to instead just use m_getcl() and try to take advantage of the newly defined secondary Packet zone. - netstat(1) and systat(1) quickly hacked up to do basic stat reporting but additional stats work needs to be done once some other details within UMA have been taken care of and it becomes clearer to how stats will work within the modified framework. From the user perspective, one implication is that the NMBCLUSTERS compile-time option is no longer used. The maximum number of clusters is still capped off according to maxusers, but it can be made unlimited by setting the kern.ipc.nmbclusters boot-time tunable to zero. Work should be done to write an appropriate sysctl handler allowing dynamic tuning of kern.ipc.nmbclusters at runtime. Additional things worth noting/known issues (READ): - One report of 'ips' (ServeRAID) driver acting really slow in conjunction with mbuma. Need more data. Latest report is that ips is equally sucking with and without mbuma. - Giant leak in NFS code sometimes occurs, can't reproduce but currently analyzing; brueffer is able to reproduce but THIS IS NOT an mbuma-specific problem and currently occurs even WITHOUT mbuma. - Issues in network locking: there is at least one code path in the rip code where one or more locks are acquired and we end up in m_prepend() with M_WAITOK, which causes WITNESS to whine from within UMA. Current temporary solution: force all UMA allocations to be M_NOWAIT from within UMA for now to avoid deadlocks unless WITNESS is defined and we can determine with certainty that we're not holding any locks when we're M_WAITOK. - I've seen at least one weird socketbuffer empty-but- mbuf-still-attached panic. I don't believe this to be related to mbuma but please keep your eyes open, turn on debugging, and capture crash dumps. This change removes more code than it adds. A paper is available detailing the change and considering various performance issues, it was presented at BSDCan2004: http://www.unixdaemons.com/~bmilekic/netbuf_bmilekic.pdf Please read the paper for Future Work and implementation details, as well as credits. Testing and Debugging: rwatson, brueffer, Ketrien I. Saihr-Kesenchedra, ... Reviewed by: Lots of people (for different parts)
2004-05-31 21:46:06 +00:00
{
struct mbuf *m;
struct mb_args *args;
* Add a "how" argument to uma_zone constructors and initialization functions so that they know whether the allocation is supposed to be able to sleep or not. * Allow uma_zone constructors and initialation functions to return either success or error. Almost all of the ones in the tree currently return success unconditionally, but mbuf is a notable exception: the packet zone constructor wants to be able to fail if it cannot suballocate an mbuf cluster, and the mbuf allocators want to be able to fail in general in a MAC kernel if the MAC mbuf initializer fails. This fixes the panics people are seeing when they run out of memory for mbuf clusters. * Allow debug.nosleepwithlocks on WITNESS to be disabled, without changing the default. Both bmilekic and jeff have reviewed the changes made to make failable zone allocations work.
2004-08-02 00:18:36 +00:00
int error;
Bring in mbuma to replace mballoc. mbuma is an Mbuf & Cluster allocator built on top of a number of extensions to the UMA framework, all included herein. Extensions to UMA worth noting: - Better layering between slab <-> zone caches; introduce Keg structure which splits off slab cache away from the zone structure and allows multiple zones to be stacked on top of a single Keg (single type of slab cache); perhaps we should look into defining a subset API on top of the Keg for special use by malloc(9), for example. - UMA_ZONE_REFCNT zones can now be added, and reference counters automagically allocated for them within the end of the associated slab structures. uma_find_refcnt() does a kextract to fetch the slab struct reference from the underlying page, and lookup the corresponding refcnt. mbuma things worth noting: - integrates mbuf & cluster allocations with extended UMA and provides caches for commonly-allocated items; defines several zones (two primary, one secondary) and two kegs. - change up certain code paths that always used to do: m_get() + m_clget() to instead just use m_getcl() and try to take advantage of the newly defined secondary Packet zone. - netstat(1) and systat(1) quickly hacked up to do basic stat reporting but additional stats work needs to be done once some other details within UMA have been taken care of and it becomes clearer to how stats will work within the modified framework. From the user perspective, one implication is that the NMBCLUSTERS compile-time option is no longer used. The maximum number of clusters is still capped off according to maxusers, but it can be made unlimited by setting the kern.ipc.nmbclusters boot-time tunable to zero. Work should be done to write an appropriate sysctl handler allowing dynamic tuning of kern.ipc.nmbclusters at runtime. Additional things worth noting/known issues (READ): - One report of 'ips' (ServeRAID) driver acting really slow in conjunction with mbuma. Need more data. Latest report is that ips is equally sucking with and without mbuma. - Giant leak in NFS code sometimes occurs, can't reproduce but currently analyzing; brueffer is able to reproduce but THIS IS NOT an mbuma-specific problem and currently occurs even WITHOUT mbuma. - Issues in network locking: there is at least one code path in the rip code where one or more locks are acquired and we end up in m_prepend() with M_WAITOK, which causes WITNESS to whine from within UMA. Current temporary solution: force all UMA allocations to be M_NOWAIT from within UMA for now to avoid deadlocks unless WITNESS is defined and we can determine with certainty that we're not holding any locks when we're M_WAITOK. - I've seen at least one weird socketbuffer empty-but- mbuf-still-attached panic. I don't believe this to be related to mbuma but please keep your eyes open, turn on debugging, and capture crash dumps. This change removes more code than it adds. A paper is available detailing the change and considering various performance issues, it was presented at BSDCan2004: http://www.unixdaemons.com/~bmilekic/netbuf_bmilekic.pdf Please read the paper for Future Work and implementation details, as well as credits. Testing and Debugging: rwatson, brueffer, Ketrien I. Saihr-Kesenchedra, ... Reviewed by: Lots of people (for different parts)
2004-05-31 21:46:06 +00:00
int flags;
short type;
args = (struct mb_args *)arg;
type = args->type;
Mandatory mbuf cluster reference counting and groundwork for UMA based jumbo 9k and jumbo 16k cluster support. All mbuf's with external storage attached are mandatory reference counted. For clusters and jumbo clusters UMA provides the refcnt storage directly. It does not have to be separatly allocated. Any other type of external storage gets its own refcnt allocated from an UMA mbuf refcnt zone instead of normal kernel malloc. The refcount API MEXT_ADD_REF() and MEXT_REM_REF() is no longer publically accessible. The proper m_* functions have to be used. mb_ctor_clust() and mb_dtor_clust() both handle normal 2K as well as 9k and 16k clusters. Clusters and jumbo clusters may be obtained without attaching it immideatly to an mbuf. This is for high performance cluster allocation in network drivers where mbufs are attached after the cluster has been filled. Tested by: rwatson Sponsored by: TCP/IP Optimizations Fundraise 2005
2005-11-02 16:20:36 +00:00
/*
* The mbuf is initialized later. The caller has the
One more grammar nit. Submitted by: ru
2006-02-27 07:22:32 +00:00
* responsibility to set up any MAC labels too.
Mandatory mbuf cluster reference counting and groundwork for UMA based jumbo 9k and jumbo 16k cluster support. All mbuf's with external storage attached are mandatory reference counted. For clusters and jumbo clusters UMA provides the refcnt storage directly. It does not have to be separatly allocated. Any other type of external storage gets its own refcnt allocated from an UMA mbuf refcnt zone instead of normal kernel malloc. The refcount API MEXT_ADD_REF() and MEXT_REM_REF() is no longer publically accessible. The proper m_* functions have to be used. mb_ctor_clust() and mb_dtor_clust() both handle normal 2K as well as 9k and 16k clusters. Clusters and jumbo clusters may be obtained without attaching it immideatly to an mbuf. This is for high performance cluster allocation in network drivers where mbufs are attached after the cluster has been filled. Tested by: rwatson Sponsored by: TCP/IP Optimizations Fundraise 2005
2005-11-02 16:20:36 +00:00
*/
if (type == MT_NOINIT)
return (0);
Avoid code duplication for mbuf initialization and use m_init() instead in mb_ctor_mbuf() and mb_ctor_pack().
2013-08-24 12:24:58 +00:00
m = (struct mbuf *)mem;
flags = args->flags;
Plug leak in m_unshare. m_unshare passes on the source mbuf's flags as-is to m_getcl and this results in a leak if the flags include M_NOFREE. The fix is to clear the bits not listed in M_COPYALL before calling m_getcl. M_RDONLY should probably be filtered out too but that's outside the scope of this fix. Add assertions in the zone_mbuf and zone_pack ctors to catch similar bugs. Update netmap_get_mbuf to not pass M_NOFREE to m_getcl. It's not clear what the original code was trying to do but it's likely incorrect. Updated code is no different functionally but it avoids the newly added assertions. Reviewed by: gnn@ Sponsored by: Chelsio Communications Differential Revision: https://reviews.freebsd.org/D5698
2016-03-26 23:39:53 +00:00
MPASS((flags & M_NOFREE) == 0);
Avoid code duplication for mbuf initialization and use m_init() instead in mb_ctor_mbuf() and mb_ctor_pack().
2013-08-24 12:24:58 +00:00
Garbage collect unused arguments of m_init().
2016-02-10 18:54:18 +00:00
error = m_init(m, how, type, flags);
Avoid code duplication for mbuf initialization and use m_init() instead in mb_ctor_mbuf() and mb_ctor_pack().
2013-08-24 12:24:58 +00:00
return (error);
Bring in mbuma to replace mballoc. mbuma is an Mbuf & Cluster allocator built on top of a number of extensions to the UMA framework, all included herein. Extensions to UMA worth noting: - Better layering between slab <-> zone caches; introduce Keg structure which splits off slab cache away from the zone structure and allows multiple zones to be stacked on top of a single Keg (single type of slab cache); perhaps we should look into defining a subset API on top of the Keg for special use by malloc(9), for example. - UMA_ZONE_REFCNT zones can now be added, and reference counters automagically allocated for them within the end of the associated slab structures. uma_find_refcnt() does a kextract to fetch the slab struct reference from the underlying page, and lookup the corresponding refcnt. mbuma things worth noting: - integrates mbuf & cluster allocations with extended UMA and provides caches for commonly-allocated items; defines several zones (two primary, one secondary) and two kegs. - change up certain code paths that always used to do: m_get() + m_clget() to instead just use m_getcl() and try to take advantage of the newly defined secondary Packet zone. - netstat(1) and systat(1) quickly hacked up to do basic stat reporting but additional stats work needs to be done once some other details within UMA have been taken care of and it becomes clearer to how stats will work within the modified framework. From the user perspective, one implication is that the NMBCLUSTERS compile-time option is no longer used. The maximum number of clusters is still capped off according to maxusers, but it can be made unlimited by setting the kern.ipc.nmbclusters boot-time tunable to zero. Work should be done to write an appropriate sysctl handler allowing dynamic tuning of kern.ipc.nmbclusters at runtime. Additional things worth noting/known issues (READ): - One report of 'ips' (ServeRAID) driver acting really slow in conjunction with mbuma. Need more data. Latest report is that ips is equally sucking with and without mbuma. - Giant leak in NFS code sometimes occurs, can't reproduce but currently analyzing; brueffer is able to reproduce but THIS IS NOT an mbuma-specific problem and currently occurs even WITHOUT mbuma. - Issues in network locking: there is at least one code path in the rip code where one or more locks are acquired and we end up in m_prepend() with M_WAITOK, which causes WITNESS to whine from within UMA. Current temporary solution: force all UMA allocations to be M_NOWAIT from within UMA for now to avoid deadlocks unless WITNESS is defined and we can determine with certainty that we're not holding any locks when we're M_WAITOK. - I've seen at least one weird socketbuffer empty-but- mbuf-still-attached panic. I don't believe this to be related to mbuma but please keep your eyes open, turn on debugging, and capture crash dumps. This change removes more code than it adds. A paper is available detailing the change and considering various performance issues, it was presented at BSDCan2004: http://www.unixdaemons.com/~bmilekic/netbuf_bmilekic.pdf Please read the paper for Future Work and implementation details, as well as credits. Testing and Debugging: rwatson, brueffer, Ketrien I. Saihr-Kesenchedra, ... Reviewed by: Lots of people (for different parts)
2004-05-31 21:46:06 +00:00
}
/*
Use zone nomenclature that is consistent with UMA.
2020-06-21 04:59:02 +00:00
* The Mbuf primary zone destructor.
Bring in mbuma to replace mballoc. mbuma is an Mbuf & Cluster allocator built on top of a number of extensions to the UMA framework, all included herein. Extensions to UMA worth noting: - Better layering between slab <-> zone caches; introduce Keg structure which splits off slab cache away from the zone structure and allows multiple zones to be stacked on top of a single Keg (single type of slab cache); perhaps we should look into defining a subset API on top of the Keg for special use by malloc(9), for example. - UMA_ZONE_REFCNT zones can now be added, and reference counters automagically allocated for them within the end of the associated slab structures. uma_find_refcnt() does a kextract to fetch the slab struct reference from the underlying page, and lookup the corresponding refcnt. mbuma things worth noting: - integrates mbuf & cluster allocations with extended UMA and provides caches for commonly-allocated items; defines several zones (two primary, one secondary) and two kegs. - change up certain code paths that always used to do: m_get() + m_clget() to instead just use m_getcl() and try to take advantage of the newly defined secondary Packet zone. - netstat(1) and systat(1) quickly hacked up to do basic stat reporting but additional stats work needs to be done once some other details within UMA have been taken care of and it becomes clearer to how stats will work within the modified framework. From the user perspective, one implication is that the NMBCLUSTERS compile-time option is no longer used. The maximum number of clusters is still capped off according to maxusers, but it can be made unlimited by setting the kern.ipc.nmbclusters boot-time tunable to zero. Work should be done to write an appropriate sysctl handler allowing dynamic tuning of kern.ipc.nmbclusters at runtime. Additional things worth noting/known issues (READ): - One report of 'ips' (ServeRAID) driver acting really slow in conjunction with mbuma. Need more data. Latest report is that ips is equally sucking with and without mbuma. - Giant leak in NFS code sometimes occurs, can't reproduce but currently analyzing; brueffer is able to reproduce but THIS IS NOT an mbuma-specific problem and currently occurs even WITHOUT mbuma. - Issues in network locking: there is at least one code path in the rip code where one or more locks are acquired and we end up in m_prepend() with M_WAITOK, which causes WITNESS to whine from within UMA. Current temporary solution: force all UMA allocations to be M_NOWAIT from within UMA for now to avoid deadlocks unless WITNESS is defined and we can determine with certainty that we're not holding any locks when we're M_WAITOK. - I've seen at least one weird socketbuffer empty-but- mbuf-still-attached panic. I don't believe this to be related to mbuma but please keep your eyes open, turn on debugging, and capture crash dumps. This change removes more code than it adds. A paper is available detailing the change and considering various performance issues, it was presented at BSDCan2004: http://www.unixdaemons.com/~bmilekic/netbuf_bmilekic.pdf Please read the paper for Future Work and implementation details, as well as credits. Testing and Debugging: rwatson, brueffer, Ketrien I. Saihr-Kesenchedra, ... Reviewed by: Lots of people (for different parts)
2004-05-31 21:46:06 +00:00
*/
static void
mb_dtor_mbuf(void *mem, int size, void *arg)
{
struct mbuf *m;
Style cleanups.
2012-12-07 22:19:41 +00:00
unsigned long flags;
Bring in mbuma to replace mballoc. mbuma is an Mbuf & Cluster allocator built on top of a number of extensions to the UMA framework, all included herein. Extensions to UMA worth noting: - Better layering between slab <-> zone caches; introduce Keg structure which splits off slab cache away from the zone structure and allows multiple zones to be stacked on top of a single Keg (single type of slab cache); perhaps we should look into defining a subset API on top of the Keg for special use by malloc(9), for example. - UMA_ZONE_REFCNT zones can now be added, and reference counters automagically allocated for them within the end of the associated slab structures. uma_find_refcnt() does a kextract to fetch the slab struct reference from the underlying page, and lookup the corresponding refcnt. mbuma things worth noting: - integrates mbuf & cluster allocations with extended UMA and provides caches for commonly-allocated items; defines several zones (two primary, one secondary) and two kegs. - change up certain code paths that always used to do: m_get() + m_clget() to instead just use m_getcl() and try to take advantage of the newly defined secondary Packet zone. - netstat(1) and systat(1) quickly hacked up to do basic stat reporting but additional stats work needs to be done once some other details within UMA have been taken care of and it becomes clearer to how stats will work within the modified framework. From the user perspective, one implication is that the NMBCLUSTERS compile-time option is no longer used. The maximum number of clusters is still capped off according to maxusers, but it can be made unlimited by setting the kern.ipc.nmbclusters boot-time tunable to zero. Work should be done to write an appropriate sysctl handler allowing dynamic tuning of kern.ipc.nmbclusters at runtime. Additional things worth noting/known issues (READ): - One report of 'ips' (ServeRAID) driver acting really slow in conjunction with mbuma. Need more data. Latest report is that ips is equally sucking with and without mbuma. - Giant leak in NFS code sometimes occurs, can't reproduce but currently analyzing; brueffer is able to reproduce but THIS IS NOT an mbuma-specific problem and currently occurs even WITHOUT mbuma. - Issues in network locking: there is at least one code path in the rip code where one or more locks are acquired and we end up in m_prepend() with M_WAITOK, which causes WITNESS to whine from within UMA. Current temporary solution: force all UMA allocations to be M_NOWAIT from within UMA for now to avoid deadlocks unless WITNESS is defined and we can determine with certainty that we're not holding any locks when we're M_WAITOK. - I've seen at least one weird socketbuffer empty-but- mbuf-still-attached panic. I don't believe this to be related to mbuma but please keep your eyes open, turn on debugging, and capture crash dumps. This change removes more code than it adds. A paper is available detailing the change and considering various performance issues, it was presented at BSDCan2004: http://www.unixdaemons.com/~bmilekic/netbuf_bmilekic.pdf Please read the paper for Future Work and implementation details, as well as credits. Testing and Debugging: rwatson, brueffer, Ketrien I. Saihr-Kesenchedra, ... Reviewed by: Lots of people (for different parts)
2004-05-31 21:46:06 +00:00
m = (struct mbuf *)mem;
Allow drivers to free an mbuf without having the mbuf be touched if the driver has already freed any attached tags Approved by: re(gnn)
2007-10-06 21:13:55 +00:00
flags = (unsigned long)arg;
style(9)
2007-10-26 16:33:47 +00:00
Test for absence of M_NOFREE before attempting to purge the mbuf's tags. This will leave more state intact should the assertion go off. MFC after: 1 month
2014-09-30 23:16:26 +00:00
KASSERT((m->m_flags & M_NOFREE) == 0, ("%s: M_NOFREE set", __func__));
Import the 'iflib' API library for network drivers. From the author: "iflib is a library to eliminate the need for frequently duplicated device independent logic propagated (poorly) across many network drivers." Participation is purely optional. The IFLIB kernel config option is provided for drivers that want to transition between legacy and iflib modes of operation. ixl and ixgbe driver conversions will be committed shortly. We hope to see participation from the Broadcom and maybe Chelsio drivers in the near future. Submitted by: mmacy@nextbsd.org Reviewed by: gallatin Differential Revision: D5211
2016-05-18 04:35:58 +00:00
if (!(flags & MB_DTOR_SKIP) && (m->m_flags & M_PKTHDR) && !SLIST_EMPTY(&m->m_pkthdr.tags))
Bring in mbuma to replace mballoc. mbuma is an Mbuf & Cluster allocator built on top of a number of extensions to the UMA framework, all included herein. Extensions to UMA worth noting: - Better layering between slab <-> zone caches; introduce Keg structure which splits off slab cache away from the zone structure and allows multiple zones to be stacked on top of a single Keg (single type of slab cache); perhaps we should look into defining a subset API on top of the Keg for special use by malloc(9), for example. - UMA_ZONE_REFCNT zones can now be added, and reference counters automagically allocated for them within the end of the associated slab structures. uma_find_refcnt() does a kextract to fetch the slab struct reference from the underlying page, and lookup the corresponding refcnt. mbuma things worth noting: - integrates mbuf & cluster allocations with extended UMA and provides caches for commonly-allocated items; defines several zones (two primary, one secondary) and two kegs. - change up certain code paths that always used to do: m_get() + m_clget() to instead just use m_getcl() and try to take advantage of the newly defined secondary Packet zone. - netstat(1) and systat(1) quickly hacked up to do basic stat reporting but additional stats work needs to be done once some other details within UMA have been taken care of and it becomes clearer to how stats will work within the modified framework. From the user perspective, one implication is that the NMBCLUSTERS compile-time option is no longer used. The maximum number of clusters is still capped off according to maxusers, but it can be made unlimited by setting the kern.ipc.nmbclusters boot-time tunable to zero. Work should be done to write an appropriate sysctl handler allowing dynamic tuning of kern.ipc.nmbclusters at runtime. Additional things worth noting/known issues (READ): - One report of 'ips' (ServeRAID) driver acting really slow in conjunction with mbuma. Need more data. Latest report is that ips is equally sucking with and without mbuma. - Giant leak in NFS code sometimes occurs, can't reproduce but currently analyzing; brueffer is able to reproduce but THIS IS NOT an mbuma-specific problem and currently occurs even WITHOUT mbuma. - Issues in network locking: there is at least one code path in the rip code where one or more locks are acquired and we end up in m_prepend() with M_WAITOK, which causes WITNESS to whine from within UMA. Current temporary solution: force all UMA allocations to be M_NOWAIT from within UMA for now to avoid deadlocks unless WITNESS is defined and we can determine with certainty that we're not holding any locks when we're M_WAITOK. - I've seen at least one weird socketbuffer empty-but- mbuf-still-attached panic. I don't believe this to be related to mbuma but please keep your eyes open, turn on debugging, and capture crash dumps. This change removes more code than it adds. A paper is available detailing the change and considering various performance issues, it was presented at BSDCan2004: http://www.unixdaemons.com/~bmilekic/netbuf_bmilekic.pdf Please read the paper for Future Work and implementation details, as well as credits. Testing and Debugging: rwatson, brueffer, Ketrien I. Saihr-Kesenchedra, ... Reviewed by: Lots of people (for different parts)
2004-05-31 21:46:06 +00:00
m_tag_delete_chain(m, NULL);
}
Mandatory mbuf cluster reference counting and groundwork for UMA based jumbo 9k and jumbo 16k cluster support. All mbuf's with external storage attached are mandatory reference counted. For clusters and jumbo clusters UMA provides the refcnt storage directly. It does not have to be separatly allocated. Any other type of external storage gets its own refcnt allocated from an UMA mbuf refcnt zone instead of normal kernel malloc. The refcount API MEXT_ADD_REF() and MEXT_REM_REF() is no longer publically accessible. The proper m_* functions have to be used. mb_ctor_clust() and mb_dtor_clust() both handle normal 2K as well as 9k and 16k clusters. Clusters and jumbo clusters may be obtained without attaching it immideatly to an mbuf. This is for high performance cluster allocation in network drivers where mbufs are attached after the cluster has been filled. Tested by: rwatson Sponsored by: TCP/IP Optimizations Fundraise 2005
2005-11-02 16:20:36 +00:00
/*
* The Mbuf Packet zone destructor.
*/
Bring in mbuma to replace mballoc. mbuma is an Mbuf & Cluster allocator built on top of a number of extensions to the UMA framework, all included herein. Extensions to UMA worth noting: - Better layering between slab <-> zone caches; introduce Keg structure which splits off slab cache away from the zone structure and allows multiple zones to be stacked on top of a single Keg (single type of slab cache); perhaps we should look into defining a subset API on top of the Keg for special use by malloc(9), for example. - UMA_ZONE_REFCNT zones can now be added, and reference counters automagically allocated for them within the end of the associated slab structures. uma_find_refcnt() does a kextract to fetch the slab struct reference from the underlying page, and lookup the corresponding refcnt. mbuma things worth noting: - integrates mbuf & cluster allocations with extended UMA and provides caches for commonly-allocated items; defines several zones (two primary, one secondary) and two kegs. - change up certain code paths that always used to do: m_get() + m_clget() to instead just use m_getcl() and try to take advantage of the newly defined secondary Packet zone. - netstat(1) and systat(1) quickly hacked up to do basic stat reporting but additional stats work needs to be done once some other details within UMA have been taken care of and it becomes clearer to how stats will work within the modified framework. From the user perspective, one implication is that the NMBCLUSTERS compile-time option is no longer used. The maximum number of clusters is still capped off according to maxusers, but it can be made unlimited by setting the kern.ipc.nmbclusters boot-time tunable to zero. Work should be done to write an appropriate sysctl handler allowing dynamic tuning of kern.ipc.nmbclusters at runtime. Additional things worth noting/known issues (READ): - One report of 'ips' (ServeRAID) driver acting really slow in conjunction with mbuma. Need more data. Latest report is that ips is equally sucking with and without mbuma. - Giant leak in NFS code sometimes occurs, can't reproduce but currently analyzing; brueffer is able to reproduce but THIS IS NOT an mbuma-specific problem and currently occurs even WITHOUT mbuma. - Issues in network locking: there is at least one code path in the rip code where one or more locks are acquired and we end up in m_prepend() with M_WAITOK, which causes WITNESS to whine from within UMA. Current temporary solution: force all UMA allocations to be M_NOWAIT from within UMA for now to avoid deadlocks unless WITNESS is defined and we can determine with certainty that we're not holding any locks when we're M_WAITOK. - I've seen at least one weird socketbuffer empty-but- mbuf-still-attached panic. I don't believe this to be related to mbuma but please keep your eyes open, turn on debugging, and capture crash dumps. This change removes more code than it adds. A paper is available detailing the change and considering various performance issues, it was presented at BSDCan2004: http://www.unixdaemons.com/~bmilekic/netbuf_bmilekic.pdf Please read the paper for Future Work and implementation details, as well as credits. Testing and Debugging: rwatson, brueffer, Ketrien I. Saihr-Kesenchedra, ... Reviewed by: Lots of people (for different parts)
2004-05-31 21:46:06 +00:00
static void
mb_dtor_pack(void *mem, int size, void *arg)
{
struct mbuf *m;
m = (struct mbuf *)mem;
if ((m->m_flags & M_PKTHDR) != 0)
m_tag_delete_chain(m, NULL);
Mandatory mbuf cluster reference counting and groundwork for UMA based jumbo 9k and jumbo 16k cluster support. All mbuf's with external storage attached are mandatory reference counted. For clusters and jumbo clusters UMA provides the refcnt storage directly. It does not have to be separatly allocated. Any other type of external storage gets its own refcnt allocated from an UMA mbuf refcnt zone instead of normal kernel malloc. The refcount API MEXT_ADD_REF() and MEXT_REM_REF() is no longer publically accessible. The proper m_* functions have to be used. mb_ctor_clust() and mb_dtor_clust() both handle normal 2K as well as 9k and 16k clusters. Clusters and jumbo clusters may be obtained without attaching it immideatly to an mbuf. This is for high performance cluster allocation in network drivers where mbufs are attached after the cluster has been filled. Tested by: rwatson Sponsored by: TCP/IP Optimizations Fundraise 2005
2005-11-02 16:20:36 +00:00
/* Make sure we've got a clean cluster back. */
KASSERT((m->m_flags & M_EXT) == M_EXT, ("%s: M_EXT not set", __func__));
KASSERT(m->m_ext.ext_buf != NULL, ("%s: ext_buf == NULL", __func__));
KASSERT(m->m_ext.ext_free == NULL, ("%s: ext_free != NULL", __func__));
Give MEXTADD() another argument to make both void pointers to the free function controlable, instead of passing the KVA of the buffer storage as the first argument. Fix all conventional users of the API to pass the KVA of the buffer as the first argument, to make this a no-op commit. Likely break the only non-convetional user of the API, after informing the relevant committer. Update the mbuf(9) manual page, which was already out of sync on this point. Bump __FreeBSD_version to 800016 as there is no way to tell how many arguments a CPP macro needs any other way. This paves the way for giving sendfile(9) a way to wait for the passed storage to have been accessed before returning. This does not affect the memory layout or size of mbufs. Parental oversight by: sam and rwatson. No MFC is anticipated.
2008-02-01 19:36:27 +00:00
KASSERT(m->m_ext.ext_arg1 == NULL, ("%s: ext_arg1 != NULL", __func__));
KASSERT(m->m_ext.ext_arg2 == NULL, ("%s: ext_arg2 != NULL", __func__));
Mandatory mbuf cluster reference counting and groundwork for UMA based jumbo 9k and jumbo 16k cluster support. All mbuf's with external storage attached are mandatory reference counted. For clusters and jumbo clusters UMA provides the refcnt storage directly. It does not have to be separatly allocated. Any other type of external storage gets its own refcnt allocated from an UMA mbuf refcnt zone instead of normal kernel malloc. The refcount API MEXT_ADD_REF() and MEXT_REM_REF() is no longer publically accessible. The proper m_* functions have to be used. mb_ctor_clust() and mb_dtor_clust() both handle normal 2K as well as 9k and 16k clusters. Clusters and jumbo clusters may be obtained without attaching it immideatly to an mbuf. This is for high performance cluster allocation in network drivers where mbufs are attached after the cluster has been filled. Tested by: rwatson Sponsored by: TCP/IP Optimizations Fundraise 2005
2005-11-02 16:20:36 +00:00
KASSERT(m->m_ext.ext_size == MCLBYTES, ("%s: ext_size != MCLBYTES", __func__));
Fix panic string in last revision.
2005-11-06 16:47:59 +00:00
KASSERT(m->m_ext.ext_type == EXT_PACKET, ("%s: ext_type != EXT_PACKET", __func__));
Change the mbuf, mbuf cluster, and mbuf packet allocation routines so that the UMA "trash" allocator is used - this ensures that any writes to a freed mbuf should provoke a panic. Only enabled under INVARIANTS, of course. Approved by: re (scottl)
2005-06-23 04:33:39 +00:00
#ifdef INVARIANTS
trash_dtor(m->m_ext.ext_buf, MCLBYTES, arg);
#endif
Fix for problems that occur when all mbuf clusters migrate to the mbuf packet zone. Cluster allocations fail when this happens. Also processes that may have blocked on cluster allocations will never be woken up. Thanks to rwatson for an overview of the issue and pointers to the mbuma paper and his tool to dump out UMA zones. Reviewed by: andre@
2007-01-25 01:05:23 +00:00
/*
style(9)
2007-10-26 16:33:47 +00:00
* If there are processes blocked on zone_clust, waiting for pages
Extend uma_reclaim() to permit different reclamation targets. The page daemon periodically invokes uma_reclaim() to reclaim cached items from each zone when the system is under memory pressure. This is important since the size of these caches is unbounded by default. However it also results in bursts of high latency when allocating from heavily used zones as threads miss in the per-CPU caches and must access the keg in order to allocate new items. With r340405 we maintain an estimate of each zone's usage of its (per-NUMA domain) cache of full buckets. Start making use of this estimate to avoid reclaiming the entire cache when under memory pressure. In particular, introduce TRIM, DRAIN and DRAIN_CPU verbs for uma_reclaim() and uma_zone_reclaim(). When trimming, only items in excess of the estimate are reclaimed. Draining a zone reclaims all of the cached full buckets (the previous behaviour of uma_reclaim()), and may further drain the per-CPU caches in extreme cases. Now, when under memory pressure, the page daemon will trim zones rather than draining them. As a result, heavily used zones do not incur bursts of bucket cache misses following reclamation, but large, unused caches will be reclaimed as before. Reviewed by: jeff Tested by: pho (an earlier version) MFC after: 2 months Sponsored by: Netflix Differential Revision: https://reviews.freebsd.org/D16667
2019-09-01 22:22:43 +00:00
* to be freed up, cause them to be woken up by draining the
* packet zone. We are exposed to a race here (in the check for
style(9)
2007-10-26 16:33:47 +00:00
* the UMA_ZFLAG_FULL) where we might miss the flag set, but that
* is deliberate. We don't want to acquire the zone lock for every
* mbuf free.
Fix for problems that occur when all mbuf clusters migrate to the mbuf packet zone. Cluster allocations fail when this happens. Also processes that may have blocked on cluster allocations will never be woken up. Thanks to rwatson for an overview of the issue and pointers to the mbuma paper and his tool to dump out UMA zones. Reviewed by: andre@
2007-01-25 01:05:23 +00:00
*/
Use a separate lock for the zone and keg. This provides concurrency between populating buckets from the slab layer and fetching full buckets from the zone layer. Eliminate some nonsense locking patterns where we lock to fetch a single variable. Reviewed by: markj Differential Revision: https://reviews.freebsd.org/D22828
2020-01-04 03:15:34 +00:00
if (uma_zone_exhausted(zone_clust))
Extend uma_reclaim() to permit different reclamation targets. The page daemon periodically invokes uma_reclaim() to reclaim cached items from each zone when the system is under memory pressure. This is important since the size of these caches is unbounded by default. However it also results in bursts of high latency when allocating from heavily used zones as threads miss in the per-CPU caches and must access the keg in order to allocate new items. With r340405 we maintain an estimate of each zone's usage of its (per-NUMA domain) cache of full buckets. Start making use of this estimate to avoid reclaiming the entire cache when under memory pressure. In particular, introduce TRIM, DRAIN and DRAIN_CPU verbs for uma_reclaim() and uma_zone_reclaim(). When trimming, only items in excess of the estimate are reclaimed. Draining a zone reclaims all of the cached full buckets (the previous behaviour of uma_reclaim()), and may further drain the per-CPU caches in extreme cases. Now, when under memory pressure, the page daemon will trim zones rather than draining them. As a result, heavily used zones do not incur bursts of bucket cache misses following reclamation, but large, unused caches will be reclaimed as before. Reviewed by: jeff Tested by: pho (an earlier version) MFC after: 2 months Sponsored by: Netflix Differential Revision: https://reviews.freebsd.org/D16667
2019-09-01 22:22:43 +00:00
uma_zone_reclaim(zone_pack, UMA_RECLAIM_DRAIN);
Bring in mbuma to replace mballoc. mbuma is an Mbuf & Cluster allocator built on top of a number of extensions to the UMA framework, all included herein. Extensions to UMA worth noting: - Better layering between slab <-> zone caches; introduce Keg structure which splits off slab cache away from the zone structure and allows multiple zones to be stacked on top of a single Keg (single type of slab cache); perhaps we should look into defining a subset API on top of the Keg for special use by malloc(9), for example. - UMA_ZONE_REFCNT zones can now be added, and reference counters automagically allocated for them within the end of the associated slab structures. uma_find_refcnt() does a kextract to fetch the slab struct reference from the underlying page, and lookup the corresponding refcnt. mbuma things worth noting: - integrates mbuf & cluster allocations with extended UMA and provides caches for commonly-allocated items; defines several zones (two primary, one secondary) and two kegs. - change up certain code paths that always used to do: m_get() + m_clget() to instead just use m_getcl() and try to take advantage of the newly defined secondary Packet zone. - netstat(1) and systat(1) quickly hacked up to do basic stat reporting but additional stats work needs to be done once some other details within UMA have been taken care of and it becomes clearer to how stats will work within the modified framework. From the user perspective, one implication is that the NMBCLUSTERS compile-time option is no longer used. The maximum number of clusters is still capped off according to maxusers, but it can be made unlimited by setting the kern.ipc.nmbclusters boot-time tunable to zero. Work should be done to write an appropriate sysctl handler allowing dynamic tuning of kern.ipc.nmbclusters at runtime. Additional things worth noting/known issues (READ): - One report of 'ips' (ServeRAID) driver acting really slow in conjunction with mbuma. Need more data. Latest report is that ips is equally sucking with and without mbuma. - Giant leak in NFS code sometimes occurs, can't reproduce but currently analyzing; brueffer is able to reproduce but THIS IS NOT an mbuma-specific problem and currently occurs even WITHOUT mbuma. - Issues in network locking: there is at least one code path in the rip code where one or more locks are acquired and we end up in m_prepend() with M_WAITOK, which causes WITNESS to whine from within UMA. Current temporary solution: force all UMA allocations to be M_NOWAIT from within UMA for now to avoid deadlocks unless WITNESS is defined and we can determine with certainty that we're not holding any locks when we're M_WAITOK. - I've seen at least one weird socketbuffer empty-but- mbuf-still-attached panic. I don't believe this to be related to mbuma but please keep your eyes open, turn on debugging, and capture crash dumps. This change removes more code than it adds. A paper is available detailing the change and considering various performance issues, it was presented at BSDCan2004: http://www.unixdaemons.com/~bmilekic/netbuf_bmilekic.pdf Please read the paper for Future Work and implementation details, as well as credits. Testing and Debugging: rwatson, brueffer, Ketrien I. Saihr-Kesenchedra, ... Reviewed by: Lots of people (for different parts)
2004-05-31 21:46:06 +00:00
}
/*
Replace the 4k fixed sized jumbo mbuf clusters with PAGE_SIZE sized jumbo mbuf clusters. To make the variable size clear they are named MJUMPAGESIZE. Having jumbo clusters with the native PAGE_SIZE is more useful than a fixed 4k size according the device driver writers using this API. The 9k and 16k jumbo mbuf clusters remain unchanged. Requested by: glebius, gallatin Sponsored by: TCP/IP Optimization Fundraise 2005 MFC after: 3 days
2006-02-17 14:14:15 +00:00
* The Cluster and Jumbo[PAGESIZE|9|16] zone constructor.
Bring in mbuma to replace mballoc. mbuma is an Mbuf & Cluster allocator built on top of a number of extensions to the UMA framework, all included herein. Extensions to UMA worth noting: - Better layering between slab <-> zone caches; introduce Keg structure which splits off slab cache away from the zone structure and allows multiple zones to be stacked on top of a single Keg (single type of slab cache); perhaps we should look into defining a subset API on top of the Keg for special use by malloc(9), for example. - UMA_ZONE_REFCNT zones can now be added, and reference counters automagically allocated for them within the end of the associated slab structures. uma_find_refcnt() does a kextract to fetch the slab struct reference from the underlying page, and lookup the corresponding refcnt. mbuma things worth noting: - integrates mbuf & cluster allocations with extended UMA and provides caches for commonly-allocated items; defines several zones (two primary, one secondary) and two kegs. - change up certain code paths that always used to do: m_get() + m_clget() to instead just use m_getcl() and try to take advantage of the newly defined secondary Packet zone. - netstat(1) and systat(1) quickly hacked up to do basic stat reporting but additional stats work needs to be done once some other details within UMA have been taken care of and it becomes clearer to how stats will work within the modified framework. From the user perspective, one implication is that the NMBCLUSTERS compile-time option is no longer used. The maximum number of clusters is still capped off according to maxusers, but it can be made unlimited by setting the kern.ipc.nmbclusters boot-time tunable to zero. Work should be done to write an appropriate sysctl handler allowing dynamic tuning of kern.ipc.nmbclusters at runtime. Additional things worth noting/known issues (READ): - One report of 'ips' (ServeRAID) driver acting really slow in conjunction with mbuma. Need more data. Latest report is that ips is equally sucking with and without mbuma. - Giant leak in NFS code sometimes occurs, can't reproduce but currently analyzing; brueffer is able to reproduce but THIS IS NOT an mbuma-specific problem and currently occurs even WITHOUT mbuma. - Issues in network locking: there is at least one code path in the rip code where one or more locks are acquired and we end up in m_prepend() with M_WAITOK, which causes WITNESS to whine from within UMA. Current temporary solution: force all UMA allocations to be M_NOWAIT from within UMA for now to avoid deadlocks unless WITNESS is defined and we can determine with certainty that we're not holding any locks when we're M_WAITOK. - I've seen at least one weird socketbuffer empty-but- mbuf-still-attached panic. I don't believe this to be related to mbuma but please keep your eyes open, turn on debugging, and capture crash dumps. This change removes more code than it adds. A paper is available detailing the change and considering various performance issues, it was presented at BSDCan2004: http://www.unixdaemons.com/~bmilekic/netbuf_bmilekic.pdf Please read the paper for Future Work and implementation details, as well as credits. Testing and Debugging: rwatson, brueffer, Ketrien I. Saihr-Kesenchedra, ... Reviewed by: Lots of people (for different parts)
2004-05-31 21:46:06 +00:00
*
* Here the 'arg' pointer points to the Mbuf which we
Mandatory mbuf cluster reference counting and groundwork for UMA based jumbo 9k and jumbo 16k cluster support. All mbuf's with external storage attached are mandatory reference counted. For clusters and jumbo clusters UMA provides the refcnt storage directly. It does not have to be separatly allocated. Any other type of external storage gets its own refcnt allocated from an UMA mbuf refcnt zone instead of normal kernel malloc. The refcount API MEXT_ADD_REF() and MEXT_REM_REF() is no longer publically accessible. The proper m_* functions have to be used. mb_ctor_clust() and mb_dtor_clust() both handle normal 2K as well as 9k and 16k clusters. Clusters and jumbo clusters may be obtained without attaching it immideatly to an mbuf. This is for high performance cluster allocation in network drivers where mbufs are attached after the cluster has been filled. Tested by: rwatson Sponsored by: TCP/IP Optimizations Fundraise 2005
2005-11-02 16:20:36 +00:00
* are configuring cluster storage for. If 'arg' is
* empty we allocate just the cluster without setting
* the mbuf to it. See mbuf.h.
Bring in mbuma to replace mballoc. mbuma is an Mbuf & Cluster allocator built on top of a number of extensions to the UMA framework, all included herein. Extensions to UMA worth noting: - Better layering between slab <-> zone caches; introduce Keg structure which splits off slab cache away from the zone structure and allows multiple zones to be stacked on top of a single Keg (single type of slab cache); perhaps we should look into defining a subset API on top of the Keg for special use by malloc(9), for example. - UMA_ZONE_REFCNT zones can now be added, and reference counters automagically allocated for them within the end of the associated slab structures. uma_find_refcnt() does a kextract to fetch the slab struct reference from the underlying page, and lookup the corresponding refcnt. mbuma things worth noting: - integrates mbuf & cluster allocations with extended UMA and provides caches for commonly-allocated items; defines several zones (two primary, one secondary) and two kegs. - change up certain code paths that always used to do: m_get() + m_clget() to instead just use m_getcl() and try to take advantage of the newly defined secondary Packet zone. - netstat(1) and systat(1) quickly hacked up to do basic stat reporting but additional stats work needs to be done once some other details within UMA have been taken care of and it becomes clearer to how stats will work within the modified framework. From the user perspective, one implication is that the NMBCLUSTERS compile-time option is no longer used. The maximum number of clusters is still capped off according to maxusers, but it can be made unlimited by setting the kern.ipc.nmbclusters boot-time tunable to zero. Work should be done to write an appropriate sysctl handler allowing dynamic tuning of kern.ipc.nmbclusters at runtime. Additional things worth noting/known issues (READ): - One report of 'ips' (ServeRAID) driver acting really slow in conjunction with mbuma. Need more data. Latest report is that ips is equally sucking with and without mbuma. - Giant leak in NFS code sometimes occurs, can't reproduce but currently analyzing; brueffer is able to reproduce but THIS IS NOT an mbuma-specific problem and currently occurs even WITHOUT mbuma. - Issues in network locking: there is at least one code path in the rip code where one or more locks are acquired and we end up in m_prepend() with M_WAITOK, which causes WITNESS to whine from within UMA. Current temporary solution: force all UMA allocations to be M_NOWAIT from within UMA for now to avoid deadlocks unless WITNESS is defined and we can determine with certainty that we're not holding any locks when we're M_WAITOK. - I've seen at least one weird socketbuffer empty-but- mbuf-still-attached panic. I don't believe this to be related to mbuma but please keep your eyes open, turn on debugging, and capture crash dumps. This change removes more code than it adds. A paper is available detailing the change and considering various performance issues, it was presented at BSDCan2004: http://www.unixdaemons.com/~bmilekic/netbuf_bmilekic.pdf Please read the paper for Future Work and implementation details, as well as credits. Testing and Debugging: rwatson, brueffer, Ketrien I. Saihr-Kesenchedra, ... Reviewed by: Lots of people (for different parts)
2004-05-31 21:46:06 +00:00
*/
* Add a "how" argument to uma_zone constructors and initialization functions so that they know whether the allocation is supposed to be able to sleep or not. * Allow uma_zone constructors and initialation functions to return either success or error. Almost all of the ones in the tree currently return success unconditionally, but mbuf is a notable exception: the packet zone constructor wants to be able to fail if it cannot suballocate an mbuf cluster, and the mbuf allocators want to be able to fail in general in a MAC kernel if the MAC mbuf initializer fails. This fixes the panics people are seeing when they run out of memory for mbuf clusters. * Allow debug.nosleepwithlocks on WITNESS to be disabled, without changing the default. Both bmilekic and jeff have reviewed the changes made to make failable zone allocations work.
2004-08-02 00:18:36 +00:00
static int
mb_ctor_clust(void *mem, int size, void *arg, int how)
Bring in mbuma to replace mballoc. mbuma is an Mbuf & Cluster allocator built on top of a number of extensions to the UMA framework, all included herein. Extensions to UMA worth noting: - Better layering between slab <-> zone caches; introduce Keg structure which splits off slab cache away from the zone structure and allows multiple zones to be stacked on top of a single Keg (single type of slab cache); perhaps we should look into defining a subset API on top of the Keg for special use by malloc(9), for example. - UMA_ZONE_REFCNT zones can now be added, and reference counters automagically allocated for them within the end of the associated slab structures. uma_find_refcnt() does a kextract to fetch the slab struct reference from the underlying page, and lookup the corresponding refcnt. mbuma things worth noting: - integrates mbuf & cluster allocations with extended UMA and provides caches for commonly-allocated items; defines several zones (two primary, one secondary) and two kegs. - change up certain code paths that always used to do: m_get() + m_clget() to instead just use m_getcl() and try to take advantage of the newly defined secondary Packet zone. - netstat(1) and systat(1) quickly hacked up to do basic stat reporting but additional stats work needs to be done once some other details within UMA have been taken care of and it becomes clearer to how stats will work within the modified framework. From the user perspective, one implication is that the NMBCLUSTERS compile-time option is no longer used. The maximum number of clusters is still capped off according to maxusers, but it can be made unlimited by setting the kern.ipc.nmbclusters boot-time tunable to zero. Work should be done to write an appropriate sysctl handler allowing dynamic tuning of kern.ipc.nmbclusters at runtime. Additional things worth noting/known issues (READ): - One report of 'ips' (ServeRAID) driver acting really slow in conjunction with mbuma. Need more data. Latest report is that ips is equally sucking with and without mbuma. - Giant leak in NFS code sometimes occurs, can't reproduce but currently analyzing; brueffer is able to reproduce but THIS IS NOT an mbuma-specific problem and currently occurs even WITHOUT mbuma. - Issues in network locking: there is at least one code path in the rip code where one or more locks are acquired and we end up in m_prepend() with M_WAITOK, which causes WITNESS to whine from within UMA. Current temporary solution: force all UMA allocations to be M_NOWAIT from within UMA for now to avoid deadlocks unless WITNESS is defined and we can determine with certainty that we're not holding any locks when we're M_WAITOK. - I've seen at least one weird socketbuffer empty-but- mbuf-still-attached panic. I don't believe this to be related to mbuma but please keep your eyes open, turn on debugging, and capture crash dumps. This change removes more code than it adds. A paper is available detailing the change and considering various performance issues, it was presented at BSDCan2004: http://www.unixdaemons.com/~bmilekic/netbuf_bmilekic.pdf Please read the paper for Future Work and implementation details, as well as credits. Testing and Debugging: rwatson, brueffer, Ketrien I. Saihr-Kesenchedra, ... Reviewed by: Lots of people (for different parts)
2004-05-31 21:46:06 +00:00
{
struct mbuf *m;
style(9)
2007-10-26 16:33:47 +00:00
Fix mb_ctor_clust and mb_dtor_clust to reference the appropriate zone, simplify setting refcnt Reviewed by: andre, rwatson, and glebius MFC after: 3 days
2007-04-04 21:27:01 +00:00
m = (struct mbuf *)arg;
if (m != NULL) {
Shorten list of arguments to mbuf external storage freeing function. All of these arguments are stored in m_ext, so there is no reason to pass them in the argument list. Not all functions need the second argument, some don't even need the first one. The second argument lives in next cache line, so not dereferencing it is a performance gain. This was discovered in sendfile(2), which will be covered by next commits. The second goal of this commit is to bring even more flexibility to m_ext mbufs, allowing to create more fields in m_ext, opaque to the generic mbuf code, and potentially set and dereferenced by subsystems. Reviewed by: gallatin, kbowling Differential Revision: https://reviews.freebsd.org/D12615
2017-10-09 20:35:31 +00:00
m->m_ext.ext_buf = (char *)mem;
Mandatory mbuf cluster reference counting and groundwork for UMA based jumbo 9k and jumbo 16k cluster support. All mbuf's with external storage attached are mandatory reference counted. For clusters and jumbo clusters UMA provides the refcnt storage directly. It does not have to be separatly allocated. Any other type of external storage gets its own refcnt allocated from an UMA mbuf refcnt zone instead of normal kernel malloc. The refcount API MEXT_ADD_REF() and MEXT_REM_REF() is no longer publically accessible. The proper m_* functions have to be used. mb_ctor_clust() and mb_dtor_clust() both handle normal 2K as well as 9k and 16k clusters. Clusters and jumbo clusters may be obtained without attaching it immideatly to an mbuf. This is for high performance cluster allocation in network drivers where mbufs are attached after the cluster has been filled. Tested by: rwatson Sponsored by: TCP/IP Optimizations Fundraise 2005
2005-11-02 16:20:36 +00:00
m->m_data = m->m_ext.ext_buf;
m->m_flags |= M_EXT;
m->m_ext.ext_free = NULL;
Give MEXTADD() another argument to make both void pointers to the free function controlable, instead of passing the KVA of the buffer storage as the first argument. Fix all conventional users of the API to pass the KVA of the buffer as the first argument, to make this a no-op commit. Likely break the only non-convetional user of the API, after informing the relevant committer. Update the mbuf(9) manual page, which was already out of sync on this point. Bump __FreeBSD_version to 800016 as there is no way to tell how many arguments a CPP macro needs any other way. This paves the way for giving sendfile(9) a way to wait for the passed storage to have been accessed before returning. This does not affect the memory layout or size of mbufs. Parental oversight by: sam and rwatson. No MFC is anticipated.
2008-02-01 19:36:27 +00:00
m->m_ext.ext_arg1 = NULL;
m->m_ext.ext_arg2 = NULL;
Mandatory mbuf cluster reference counting and groundwork for UMA based jumbo 9k and jumbo 16k cluster support. All mbuf's with external storage attached are mandatory reference counted. For clusters and jumbo clusters UMA provides the refcnt storage directly. It does not have to be separatly allocated. Any other type of external storage gets its own refcnt allocated from an UMA mbuf refcnt zone instead of normal kernel malloc. The refcount API MEXT_ADD_REF() and MEXT_REM_REF() is no longer publically accessible. The proper m_* functions have to be used. mb_ctor_clust() and mb_dtor_clust() both handle normal 2K as well as 9k and 16k clusters. Clusters and jumbo clusters may be obtained without attaching it immideatly to an mbuf. This is for high performance cluster allocation in network drivers where mbufs are attached after the cluster has been filled. Tested by: rwatson Sponsored by: TCP/IP Optimizations Fundraise 2005
2005-11-02 16:20:36 +00:00
m->m_ext.ext_size = size;
New way to manage reference counting of mbuf external storage. The m_ext.ext_cnt pointer becomes a union. It can now hold the refcount value itself. To tell that m_ext.ext_flags flag EXT_FLAG_EMBREF is used. The first mbuf to attach a cluster stores the refcount. The further mbufs to reference the cluster point at refcount in the first mbuf. The first mbuf is freed only when the last reference is freed. The benefit over refcounts stored in separate slabs is that now refcounts of different, unrelated mbufs do not share a cache line. For EXT_EXTREF mbufs the zone_ext_refcnt is no longer needed, and m_extadd() becomes void, making widely used M_EXTADD macro safe. For EXT_SFBUF mbufs the sf_ext_ref() is removed, which was an optimization exactly against the cache aliasing problem with regular refcounting. Discussed with: rrs, rwatson, gnn, hiren, sbruno, np Reviewed by: rrs Differential Revision: https://reviews.freebsd.org/D5396 Sponsored by: Netflix
2016-03-01 00:17:14 +00:00
m->m_ext.ext_type = m_gettype(size);
m->m_ext.ext_flags = EXT_FLAG_EMBREF;
m->m_ext.ext_count = 1;
Mandatory mbuf cluster reference counting and groundwork for UMA based jumbo 9k and jumbo 16k cluster support. All mbuf's with external storage attached are mandatory reference counted. For clusters and jumbo clusters UMA provides the refcnt storage directly. It does not have to be separatly allocated. Any other type of external storage gets its own refcnt allocated from an UMA mbuf refcnt zone instead of normal kernel malloc. The refcount API MEXT_ADD_REF() and MEXT_REM_REF() is no longer publically accessible. The proper m_* functions have to be used. mb_ctor_clust() and mb_dtor_clust() both handle normal 2K as well as 9k and 16k clusters. Clusters and jumbo clusters may be obtained without attaching it immideatly to an mbuf. This is for high performance cluster allocation in network drivers where mbufs are attached after the cluster has been filled. Tested by: rwatson Sponsored by: TCP/IP Optimizations Fundraise 2005
2005-11-02 16:20:36 +00:00
}
Fix mb_ctor_clust and mb_dtor_clust to reference the appropriate zone, simplify setting refcnt Reviewed by: andre, rwatson, and glebius MFC after: 3 days
2007-04-04 21:27:01 +00:00
* Add a "how" argument to uma_zone constructors and initialization functions so that they know whether the allocation is supposed to be able to sleep or not. * Allow uma_zone constructors and initialation functions to return either success or error. Almost all of the ones in the tree currently return success unconditionally, but mbuf is a notable exception: the packet zone constructor wants to be able to fail if it cannot suballocate an mbuf cluster, and the mbuf allocators want to be able to fail in general in a MAC kernel if the MAC mbuf initializer fails. This fixes the panics people are seeing when they run out of memory for mbuf clusters. * Allow debug.nosleepwithlocks on WITNESS to be disabled, without changing the default. Both bmilekic and jeff have reviewed the changes made to make failable zone allocations work.
2004-08-02 00:18:36 +00:00
return (0);
Bring in mbuma to replace mballoc. mbuma is an Mbuf & Cluster allocator built on top of a number of extensions to the UMA framework, all included herein. Extensions to UMA worth noting: - Better layering between slab <-> zone caches; introduce Keg structure which splits off slab cache away from the zone structure and allows multiple zones to be stacked on top of a single Keg (single type of slab cache); perhaps we should look into defining a subset API on top of the Keg for special use by malloc(9), for example. - UMA_ZONE_REFCNT zones can now be added, and reference counters automagically allocated for them within the end of the associated slab structures. uma_find_refcnt() does a kextract to fetch the slab struct reference from the underlying page, and lookup the corresponding refcnt. mbuma things worth noting: - integrates mbuf & cluster allocations with extended UMA and provides caches for commonly-allocated items; defines several zones (two primary, one secondary) and two kegs. - change up certain code paths that always used to do: m_get() + m_clget() to instead just use m_getcl() and try to take advantage of the newly defined secondary Packet zone. - netstat(1) and systat(1) quickly hacked up to do basic stat reporting but additional stats work needs to be done once some other details within UMA have been taken care of and it becomes clearer to how stats will work within the modified framework. From the user perspective, one implication is that the NMBCLUSTERS compile-time option is no longer used. The maximum number of clusters is still capped off according to maxusers, but it can be made unlimited by setting the kern.ipc.nmbclusters boot-time tunable to zero. Work should be done to write an appropriate sysctl handler allowing dynamic tuning of kern.ipc.nmbclusters at runtime. Additional things worth noting/known issues (READ): - One report of 'ips' (ServeRAID) driver acting really slow in conjunction with mbuma. Need more data. Latest report is that ips is equally sucking with and without mbuma. - Giant leak in NFS code sometimes occurs, can't reproduce but currently analyzing; brueffer is able to reproduce but THIS IS NOT an mbuma-specific problem and currently occurs even WITHOUT mbuma. - Issues in network locking: there is at least one code path in the rip code where one or more locks are acquired and we end up in m_prepend() with M_WAITOK, which causes WITNESS to whine from within UMA. Current temporary solution: force all UMA allocations to be M_NOWAIT from within UMA for now to avoid deadlocks unless WITNESS is defined and we can determine with certainty that we're not holding any locks when we're M_WAITOK. - I've seen at least one weird socketbuffer empty-but- mbuf-still-attached panic. I don't believe this to be related to mbuma but please keep your eyes open, turn on debugging, and capture crash dumps. This change removes more code than it adds. A paper is available detailing the change and considering various performance issues, it was presented at BSDCan2004: http://www.unixdaemons.com/~bmilekic/netbuf_bmilekic.pdf Please read the paper for Future Work and implementation details, as well as credits. Testing and Debugging: rwatson, brueffer, Ketrien I. Saihr-Kesenchedra, ... Reviewed by: Lots of people (for different parts)
2004-05-31 21:46:06 +00:00
}
/*
* The Packet secondary zone's init routine, executed on the
Mandatory mbuf cluster reference counting and groundwork for UMA based jumbo 9k and jumbo 16k cluster support. All mbuf's with external storage attached are mandatory reference counted. For clusters and jumbo clusters UMA provides the refcnt storage directly. It does not have to be separatly allocated. Any other type of external storage gets its own refcnt allocated from an UMA mbuf refcnt zone instead of normal kernel malloc. The refcount API MEXT_ADD_REF() and MEXT_REM_REF() is no longer publically accessible. The proper m_* functions have to be used. mb_ctor_clust() and mb_dtor_clust() both handle normal 2K as well as 9k and 16k clusters. Clusters and jumbo clusters may be obtained without attaching it immideatly to an mbuf. This is for high performance cluster allocation in network drivers where mbufs are attached after the cluster has been filled. Tested by: rwatson Sponsored by: TCP/IP Optimizations Fundraise 2005
2005-11-02 16:20:36 +00:00
* object's transition from mbuf keg slab to zone cache.
Bring in mbuma to replace mballoc. mbuma is an Mbuf & Cluster allocator built on top of a number of extensions to the UMA framework, all included herein. Extensions to UMA worth noting: - Better layering between slab <-> zone caches; introduce Keg structure which splits off slab cache away from the zone structure and allows multiple zones to be stacked on top of a single Keg (single type of slab cache); perhaps we should look into defining a subset API on top of the Keg for special use by malloc(9), for example. - UMA_ZONE_REFCNT zones can now be added, and reference counters automagically allocated for them within the end of the associated slab structures. uma_find_refcnt() does a kextract to fetch the slab struct reference from the underlying page, and lookup the corresponding refcnt. mbuma things worth noting: - integrates mbuf & cluster allocations with extended UMA and provides caches for commonly-allocated items; defines several zones (two primary, one secondary) and two kegs. - change up certain code paths that always used to do: m_get() + m_clget() to instead just use m_getcl() and try to take advantage of the newly defined secondary Packet zone. - netstat(1) and systat(1) quickly hacked up to do basic stat reporting but additional stats work needs to be done once some other details within UMA have been taken care of and it becomes clearer to how stats will work within the modified framework. From the user perspective, one implication is that the NMBCLUSTERS compile-time option is no longer used. The maximum number of clusters is still capped off according to maxusers, but it can be made unlimited by setting the kern.ipc.nmbclusters boot-time tunable to zero. Work should be done to write an appropriate sysctl handler allowing dynamic tuning of kern.ipc.nmbclusters at runtime. Additional things worth noting/known issues (READ): - One report of 'ips' (ServeRAID) driver acting really slow in conjunction with mbuma. Need more data. Latest report is that ips is equally sucking with and without mbuma. - Giant leak in NFS code sometimes occurs, can't reproduce but currently analyzing; brueffer is able to reproduce but THIS IS NOT an mbuma-specific problem and currently occurs even WITHOUT mbuma. - Issues in network locking: there is at least one code path in the rip code where one or more locks are acquired and we end up in m_prepend() with M_WAITOK, which causes WITNESS to whine from within UMA. Current temporary solution: force all UMA allocations to be M_NOWAIT from within UMA for now to avoid deadlocks unless WITNESS is defined and we can determine with certainty that we're not holding any locks when we're M_WAITOK. - I've seen at least one weird socketbuffer empty-but- mbuf-still-attached panic. I don't believe this to be related to mbuma but please keep your eyes open, turn on debugging, and capture crash dumps. This change removes more code than it adds. A paper is available detailing the change and considering various performance issues, it was presented at BSDCan2004: http://www.unixdaemons.com/~bmilekic/netbuf_bmilekic.pdf Please read the paper for Future Work and implementation details, as well as credits. Testing and Debugging: rwatson, brueffer, Ketrien I. Saihr-Kesenchedra, ... Reviewed by: Lots of people (for different parts)
2004-05-31 21:46:06 +00:00
*/
* Add a "how" argument to uma_zone constructors and initialization functions so that they know whether the allocation is supposed to be able to sleep or not. * Allow uma_zone constructors and initialation functions to return either success or error. Almost all of the ones in the tree currently return success unconditionally, but mbuf is a notable exception: the packet zone constructor wants to be able to fail if it cannot suballocate an mbuf cluster, and the mbuf allocators want to be able to fail in general in a MAC kernel if the MAC mbuf initializer fails. This fixes the panics people are seeing when they run out of memory for mbuf clusters. * Allow debug.nosleepwithlocks on WITNESS to be disabled, without changing the default. Both bmilekic and jeff have reviewed the changes made to make failable zone allocations work.
2004-08-02 00:18:36 +00:00
static int
Mandatory mbuf cluster reference counting and groundwork for UMA based jumbo 9k and jumbo 16k cluster support. All mbuf's with external storage attached are mandatory reference counted. For clusters and jumbo clusters UMA provides the refcnt storage directly. It does not have to be separatly allocated. Any other type of external storage gets its own refcnt allocated from an UMA mbuf refcnt zone instead of normal kernel malloc. The refcount API MEXT_ADD_REF() and MEXT_REM_REF() is no longer publically accessible. The proper m_* functions have to be used. mb_ctor_clust() and mb_dtor_clust() both handle normal 2K as well as 9k and 16k clusters. Clusters and jumbo clusters may be obtained without attaching it immideatly to an mbuf. This is for high performance cluster allocation in network drivers where mbufs are attached after the cluster has been filled. Tested by: rwatson Sponsored by: TCP/IP Optimizations Fundraise 2005
2005-11-02 16:20:36 +00:00
mb_zinit_pack(void *mem, int size, int how)
Bring in mbuma to replace mballoc. mbuma is an Mbuf & Cluster allocator built on top of a number of extensions to the UMA framework, all included herein. Extensions to UMA worth noting: - Better layering between slab <-> zone caches; introduce Keg structure which splits off slab cache away from the zone structure and allows multiple zones to be stacked on top of a single Keg (single type of slab cache); perhaps we should look into defining a subset API on top of the Keg for special use by malloc(9), for example. - UMA_ZONE_REFCNT zones can now be added, and reference counters automagically allocated for them within the end of the associated slab structures. uma_find_refcnt() does a kextract to fetch the slab struct reference from the underlying page, and lookup the corresponding refcnt. mbuma things worth noting: - integrates mbuf & cluster allocations with extended UMA and provides caches for commonly-allocated items; defines several zones (two primary, one secondary) and two kegs. - change up certain code paths that always used to do: m_get() + m_clget() to instead just use m_getcl() and try to take advantage of the newly defined secondary Packet zone. - netstat(1) and systat(1) quickly hacked up to do basic stat reporting but additional stats work needs to be done once some other details within UMA have been taken care of and it becomes clearer to how stats will work within the modified framework. From the user perspective, one implication is that the NMBCLUSTERS compile-time option is no longer used. The maximum number of clusters is still capped off according to maxusers, but it can be made unlimited by setting the kern.ipc.nmbclusters boot-time tunable to zero. Work should be done to write an appropriate sysctl handler allowing dynamic tuning of kern.ipc.nmbclusters at runtime. Additional things worth noting/known issues (READ): - One report of 'ips' (ServeRAID) driver acting really slow in conjunction with mbuma. Need more data. Latest report is that ips is equally sucking with and without mbuma. - Giant leak in NFS code sometimes occurs, can't reproduce but currently analyzing; brueffer is able to reproduce but THIS IS NOT an mbuma-specific problem and currently occurs even WITHOUT mbuma. - Issues in network locking: there is at least one code path in the rip code where one or more locks are acquired and we end up in m_prepend() with M_WAITOK, which causes WITNESS to whine from within UMA. Current temporary solution: force all UMA allocations to be M_NOWAIT from within UMA for now to avoid deadlocks unless WITNESS is defined and we can determine with certainty that we're not holding any locks when we're M_WAITOK. - I've seen at least one weird socketbuffer empty-but- mbuf-still-attached panic. I don't believe this to be related to mbuma but please keep your eyes open, turn on debugging, and capture crash dumps. This change removes more code than it adds. A paper is available detailing the change and considering various performance issues, it was presented at BSDCan2004: http://www.unixdaemons.com/~bmilekic/netbuf_bmilekic.pdf Please read the paper for Future Work and implementation details, as well as credits. Testing and Debugging: rwatson, brueffer, Ketrien I. Saihr-Kesenchedra, ... Reviewed by: Lots of people (for different parts)
2004-05-31 21:46:06 +00:00
{
struct mbuf *m;
Mandatory mbuf cluster reference counting and groundwork for UMA based jumbo 9k and jumbo 16k cluster support. All mbuf's with external storage attached are mandatory reference counted. For clusters and jumbo clusters UMA provides the refcnt storage directly. It does not have to be separatly allocated. Any other type of external storage gets its own refcnt allocated from an UMA mbuf refcnt zone instead of normal kernel malloc. The refcount API MEXT_ADD_REF() and MEXT_REM_REF() is no longer publically accessible. The proper m_* functions have to be used. mb_ctor_clust() and mb_dtor_clust() both handle normal 2K as well as 9k and 16k clusters. Clusters and jumbo clusters may be obtained without attaching it immideatly to an mbuf. This is for high performance cluster allocation in network drivers where mbufs are attached after the cluster has been filled. Tested by: rwatson Sponsored by: TCP/IP Optimizations Fundraise 2005
2005-11-02 16:20:36 +00:00
m = (struct mbuf *)mem; /* m is virgin. */
Properly handle the case when the packet secondary zone can't allocate further mbuf clusters to attach to mbufs. Reported by: kris Tested by: kris Sponsored by: TCP/IP Optimization Fundraise 2005 MFC after: 3 days
2006-03-08 14:05:38 +00:00
if (uma_zalloc_arg(zone_clust, m, how) == NULL ||
m->m_ext.ext_buf == NULL)
* Add a "how" argument to uma_zone constructors and initialization functions so that they know whether the allocation is supposed to be able to sleep or not. * Allow uma_zone constructors and initialation functions to return either success or error. Almost all of the ones in the tree currently return success unconditionally, but mbuf is a notable exception: the packet zone constructor wants to be able to fail if it cannot suballocate an mbuf cluster, and the mbuf allocators want to be able to fail in general in a MAC kernel if the MAC mbuf initializer fails. This fixes the panics people are seeing when they run out of memory for mbuf clusters. * Allow debug.nosleepwithlocks on WITNESS to be disabled, without changing the default. Both bmilekic and jeff have reviewed the changes made to make failable zone allocations work.
2004-08-02 00:18:36 +00:00
return (ENOMEM);
Free only those mbuf+clusters back to the packet zone that were allocated from there. All others get broken up and free'd individually to the mbuf and cluster zones. The packet zone is a secondary zone to the mbuf zone. There is currently a limitation in UMA which prevents decreasing the packet zone stock when the mbuf and cluster zone are drained and all their members are part of packets. When this is fixed this change may be reverted.
2005-11-05 19:43:55 +00:00
m->m_ext.ext_type = EXT_PACKET; /* Override. */
Change the mbuf, mbuf cluster, and mbuf packet allocation routines so that the UMA "trash" allocator is used - this ensures that any writes to a freed mbuf should provoke a panic. Only enabled under INVARIANTS, of course. Approved by: re (scottl)
2005-06-23 04:33:39 +00:00
#ifdef INVARIANTS
trash_init(m->m_ext.ext_buf, MCLBYTES, how);
#endif
* Add a "how" argument to uma_zone constructors and initialization functions so that they know whether the allocation is supposed to be able to sleep or not. * Allow uma_zone constructors and initialation functions to return either success or error. Almost all of the ones in the tree currently return success unconditionally, but mbuf is a notable exception: the packet zone constructor wants to be able to fail if it cannot suballocate an mbuf cluster, and the mbuf allocators want to be able to fail in general in a MAC kernel if the MAC mbuf initializer fails. This fixes the panics people are seeing when they run out of memory for mbuf clusters. * Allow debug.nosleepwithlocks on WITNESS to be disabled, without changing the default. Both bmilekic and jeff have reviewed the changes made to make failable zone allocations work.
2004-08-02 00:18:36 +00:00
return (0);
Bring in mbuma to replace mballoc. mbuma is an Mbuf & Cluster allocator built on top of a number of extensions to the UMA framework, all included herein. Extensions to UMA worth noting: - Better layering between slab <-> zone caches; introduce Keg structure which splits off slab cache away from the zone structure and allows multiple zones to be stacked on top of a single Keg (single type of slab cache); perhaps we should look into defining a subset API on top of the Keg for special use by malloc(9), for example. - UMA_ZONE_REFCNT zones can now be added, and reference counters automagically allocated for them within the end of the associated slab structures. uma_find_refcnt() does a kextract to fetch the slab struct reference from the underlying page, and lookup the corresponding refcnt. mbuma things worth noting: - integrates mbuf & cluster allocations with extended UMA and provides caches for commonly-allocated items; defines several zones (two primary, one secondary) and two kegs. - change up certain code paths that always used to do: m_get() + m_clget() to instead just use m_getcl() and try to take advantage of the newly defined secondary Packet zone. - netstat(1) and systat(1) quickly hacked up to do basic stat reporting but additional stats work needs to be done once some other details within UMA have been taken care of and it becomes clearer to how stats will work within the modified framework. From the user perspective, one implication is that the NMBCLUSTERS compile-time option is no longer used. The maximum number of clusters is still capped off according to maxusers, but it can be made unlimited by setting the kern.ipc.nmbclusters boot-time tunable to zero. Work should be done to write an appropriate sysctl handler allowing dynamic tuning of kern.ipc.nmbclusters at runtime. Additional things worth noting/known issues (READ): - One report of 'ips' (ServeRAID) driver acting really slow in conjunction with mbuma. Need more data. Latest report is that ips is equally sucking with and without mbuma. - Giant leak in NFS code sometimes occurs, can't reproduce but currently analyzing; brueffer is able to reproduce but THIS IS NOT an mbuma-specific problem and currently occurs even WITHOUT mbuma. - Issues in network locking: there is at least one code path in the rip code where one or more locks are acquired and we end up in m_prepend() with M_WAITOK, which causes WITNESS to whine from within UMA. Current temporary solution: force all UMA allocations to be M_NOWAIT from within UMA for now to avoid deadlocks unless WITNESS is defined and we can determine with certainty that we're not holding any locks when we're M_WAITOK. - I've seen at least one weird socketbuffer empty-but- mbuf-still-attached panic. I don't believe this to be related to mbuma but please keep your eyes open, turn on debugging, and capture crash dumps. This change removes more code than it adds. A paper is available detailing the change and considering various performance issues, it was presented at BSDCan2004: http://www.unixdaemons.com/~bmilekic/netbuf_bmilekic.pdf Please read the paper for Future Work and implementation details, as well as credits. Testing and Debugging: rwatson, brueffer, Ketrien I. Saihr-Kesenchedra, ... Reviewed by: Lots of people (for different parts)
2004-05-31 21:46:06 +00:00
}
/*
* The Packet secondary zone's fini routine, executed on the
* object's transition from zone cache to keg slab.
*/
static void
Mandatory mbuf cluster reference counting and groundwork for UMA based jumbo 9k and jumbo 16k cluster support. All mbuf's with external storage attached are mandatory reference counted. For clusters and jumbo clusters UMA provides the refcnt storage directly. It does not have to be separatly allocated. Any other type of external storage gets its own refcnt allocated from an UMA mbuf refcnt zone instead of normal kernel malloc. The refcount API MEXT_ADD_REF() and MEXT_REM_REF() is no longer publically accessible. The proper m_* functions have to be used. mb_ctor_clust() and mb_dtor_clust() both handle normal 2K as well as 9k and 16k clusters. Clusters and jumbo clusters may be obtained without attaching it immideatly to an mbuf. This is for high performance cluster allocation in network drivers where mbufs are attached after the cluster has been filled. Tested by: rwatson Sponsored by: TCP/IP Optimizations Fundraise 2005
2005-11-02 16:20:36 +00:00
mb_zfini_pack(void *mem, int size)
Bring in mbuma to replace mballoc. mbuma is an Mbuf & Cluster allocator built on top of a number of extensions to the UMA framework, all included herein. Extensions to UMA worth noting: - Better layering between slab <-> zone caches; introduce Keg structure which splits off slab cache away from the zone structure and allows multiple zones to be stacked on top of a single Keg (single type of slab cache); perhaps we should look into defining a subset API on top of the Keg for special use by malloc(9), for example. - UMA_ZONE_REFCNT zones can now be added, and reference counters automagically allocated for them within the end of the associated slab structures. uma_find_refcnt() does a kextract to fetch the slab struct reference from the underlying page, and lookup the corresponding refcnt. mbuma things worth noting: - integrates mbuf & cluster allocations with extended UMA and provides caches for commonly-allocated items; defines several zones (two primary, one secondary) and two kegs. - change up certain code paths that always used to do: m_get() + m_clget() to instead just use m_getcl() and try to take advantage of the newly defined secondary Packet zone. - netstat(1) and systat(1) quickly hacked up to do basic stat reporting but additional stats work needs to be done once some other details within UMA have been taken care of and it becomes clearer to how stats will work within the modified framework. From the user perspective, one implication is that the NMBCLUSTERS compile-time option is no longer used. The maximum number of clusters is still capped off according to maxusers, but it can be made unlimited by setting the kern.ipc.nmbclusters boot-time tunable to zero. Work should be done to write an appropriate sysctl handler allowing dynamic tuning of kern.ipc.nmbclusters at runtime. Additional things worth noting/known issues (READ): - One report of 'ips' (ServeRAID) driver acting really slow in conjunction with mbuma. Need more data. Latest report is that ips is equally sucking with and without mbuma. - Giant leak in NFS code sometimes occurs, can't reproduce but currently analyzing; brueffer is able to reproduce but THIS IS NOT an mbuma-specific problem and currently occurs even WITHOUT mbuma. - Issues in network locking: there is at least one code path in the rip code where one or more locks are acquired and we end up in m_prepend() with M_WAITOK, which causes WITNESS to whine from within UMA. Current temporary solution: force all UMA allocations to be M_NOWAIT from within UMA for now to avoid deadlocks unless WITNESS is defined and we can determine with certainty that we're not holding any locks when we're M_WAITOK. - I've seen at least one weird socketbuffer empty-but- mbuf-still-attached panic. I don't believe this to be related to mbuma but please keep your eyes open, turn on debugging, and capture crash dumps. This change removes more code than it adds. A paper is available detailing the change and considering various performance issues, it was presented at BSDCan2004: http://www.unixdaemons.com/~bmilekic/netbuf_bmilekic.pdf Please read the paper for Future Work and implementation details, as well as credits. Testing and Debugging: rwatson, brueffer, Ketrien I. Saihr-Kesenchedra, ... Reviewed by: Lots of people (for different parts)
2004-05-31 21:46:06 +00:00
{
struct mbuf *m;
m = (struct mbuf *)mem;
Change the mbuf, mbuf cluster, and mbuf packet allocation routines so that the UMA "trash" allocator is used - this ensures that any writes to a freed mbuf should provoke a panic. Only enabled under INVARIANTS, of course. Approved by: re (scottl)
2005-06-23 04:33:39 +00:00
#ifdef INVARIANTS
trash_fini(m->m_ext.ext_buf, MCLBYTES);
#endif
Bring in mbuma to replace mballoc. mbuma is an Mbuf & Cluster allocator built on top of a number of extensions to the UMA framework, all included herein. Extensions to UMA worth noting: - Better layering between slab <-> zone caches; introduce Keg structure which splits off slab cache away from the zone structure and allows multiple zones to be stacked on top of a single Keg (single type of slab cache); perhaps we should look into defining a subset API on top of the Keg for special use by malloc(9), for example. - UMA_ZONE_REFCNT zones can now be added, and reference counters automagically allocated for them within the end of the associated slab structures. uma_find_refcnt() does a kextract to fetch the slab struct reference from the underlying page, and lookup the corresponding refcnt. mbuma things worth noting: - integrates mbuf & cluster allocations with extended UMA and provides caches for commonly-allocated items; defines several zones (two primary, one secondary) and two kegs. - change up certain code paths that always used to do: m_get() + m_clget() to instead just use m_getcl() and try to take advantage of the newly defined secondary Packet zone. - netstat(1) and systat(1) quickly hacked up to do basic stat reporting but additional stats work needs to be done once some other details within UMA have been taken care of and it becomes clearer to how stats will work within the modified framework. From the user perspective, one implication is that the NMBCLUSTERS compile-time option is no longer used. The maximum number of clusters is still capped off according to maxusers, but it can be made unlimited by setting the kern.ipc.nmbclusters boot-time tunable to zero. Work should be done to write an appropriate sysctl handler allowing dynamic tuning of kern.ipc.nmbclusters at runtime. Additional things worth noting/known issues (READ): - One report of 'ips' (ServeRAID) driver acting really slow in conjunction with mbuma. Need more data. Latest report is that ips is equally sucking with and without mbuma. - Giant leak in NFS code sometimes occurs, can't reproduce but currently analyzing; brueffer is able to reproduce but THIS IS NOT an mbuma-specific problem and currently occurs even WITHOUT mbuma. - Issues in network locking: there is at least one code path in the rip code where one or more locks are acquired and we end up in m_prepend() with M_WAITOK, which causes WITNESS to whine from within UMA. Current temporary solution: force all UMA allocations to be M_NOWAIT from within UMA for now to avoid deadlocks unless WITNESS is defined and we can determine with certainty that we're not holding any locks when we're M_WAITOK. - I've seen at least one weird socketbuffer empty-but- mbuf-still-attached panic. I don't believe this to be related to mbuma but please keep your eyes open, turn on debugging, and capture crash dumps. This change removes more code than it adds. A paper is available detailing the change and considering various performance issues, it was presented at BSDCan2004: http://www.unixdaemons.com/~bmilekic/netbuf_bmilekic.pdf Please read the paper for Future Work and implementation details, as well as credits. Testing and Debugging: rwatson, brueffer, Ketrien I. Saihr-Kesenchedra, ... Reviewed by: Lots of people (for different parts)
2004-05-31 21:46:06 +00:00
uma_zfree_arg(zone_clust, m->m_ext.ext_buf, NULL);
Fix the false memory modified after free messages some users have been reporting - in my previous change, I missed the case where a mbuf from the packet zone was freed back to the mbuf/packet keg, where it was subsequently put into the mbuf zone and found not to contain the expected trash. This change adds the necessary trash_dtor call inside mb_fini_pack so that everything is correct. Thanks for Bosko for finding the bug and showing me how secondary zones work. Approved by: re (dwhite)
2005-06-29 08:18:26 +00:00
#ifdef INVARIANTS
trash_dtor(mem, size, NULL);
#endif
Bring in mbuma to replace mballoc. mbuma is an Mbuf & Cluster allocator built on top of a number of extensions to the UMA framework, all included herein. Extensions to UMA worth noting: - Better layering between slab <-> zone caches; introduce Keg structure which splits off slab cache away from the zone structure and allows multiple zones to be stacked on top of a single Keg (single type of slab cache); perhaps we should look into defining a subset API on top of the Keg for special use by malloc(9), for example. - UMA_ZONE_REFCNT zones can now be added, and reference counters automagically allocated for them within the end of the associated slab structures. uma_find_refcnt() does a kextract to fetch the slab struct reference from the underlying page, and lookup the corresponding refcnt. mbuma things worth noting: - integrates mbuf & cluster allocations with extended UMA and provides caches for commonly-allocated items; defines several zones (two primary, one secondary) and two kegs. - change up certain code paths that always used to do: m_get() + m_clget() to instead just use m_getcl() and try to take advantage of the newly defined secondary Packet zone. - netstat(1) and systat(1) quickly hacked up to do basic stat reporting but additional stats work needs to be done once some other details within UMA have been taken care of and it becomes clearer to how stats will work within the modified framework. From the user perspective, one implication is that the NMBCLUSTERS compile-time option is no longer used. The maximum number of clusters is still capped off according to maxusers, but it can be made unlimited by setting the kern.ipc.nmbclusters boot-time tunable to zero. Work should be done to write an appropriate sysctl handler allowing dynamic tuning of kern.ipc.nmbclusters at runtime. Additional things worth noting/known issues (READ): - One report of 'ips' (ServeRAID) driver acting really slow in conjunction with mbuma. Need more data. Latest report is that ips is equally sucking with and without mbuma. - Giant leak in NFS code sometimes occurs, can't reproduce but currently analyzing; brueffer is able to reproduce but THIS IS NOT an mbuma-specific problem and currently occurs even WITHOUT mbuma. - Issues in network locking: there is at least one code path in the rip code where one or more locks are acquired and we end up in m_prepend() with M_WAITOK, which causes WITNESS to whine from within UMA. Current temporary solution: force all UMA allocations to be M_NOWAIT from within UMA for now to avoid deadlocks unless WITNESS is defined and we can determine with certainty that we're not holding any locks when we're M_WAITOK. - I've seen at least one weird socketbuffer empty-but- mbuf-still-attached panic. I don't believe this to be related to mbuma but please keep your eyes open, turn on debugging, and capture crash dumps. This change removes more code than it adds. A paper is available detailing the change and considering various performance issues, it was presented at BSDCan2004: http://www.unixdaemons.com/~bmilekic/netbuf_bmilekic.pdf Please read the paper for Future Work and implementation details, as well as credits. Testing and Debugging: rwatson, brueffer, Ketrien I. Saihr-Kesenchedra, ... Reviewed by: Lots of people (for different parts)
2004-05-31 21:46:06 +00:00
}
/*
* The "packet" keg constructor.
*/
* Add a "how" argument to uma_zone constructors and initialization functions so that they know whether the allocation is supposed to be able to sleep or not. * Allow uma_zone constructors and initialation functions to return either success or error. Almost all of the ones in the tree currently return success unconditionally, but mbuf is a notable exception: the packet zone constructor wants to be able to fail if it cannot suballocate an mbuf cluster, and the mbuf allocators want to be able to fail in general in a MAC kernel if the MAC mbuf initializer fails. This fixes the panics people are seeing when they run out of memory for mbuf clusters. * Allow debug.nosleepwithlocks on WITNESS to be disabled, without changing the default. Both bmilekic and jeff have reviewed the changes made to make failable zone allocations work.
2004-08-02 00:18:36 +00:00
static int
mb_ctor_pack(void *mem, int size, void *arg, int how)
Bring in mbuma to replace mballoc. mbuma is an Mbuf & Cluster allocator built on top of a number of extensions to the UMA framework, all included herein. Extensions to UMA worth noting: - Better layering between slab <-> zone caches; introduce Keg structure which splits off slab cache away from the zone structure and allows multiple zones to be stacked on top of a single Keg (single type of slab cache); perhaps we should look into defining a subset API on top of the Keg for special use by malloc(9), for example. - UMA_ZONE_REFCNT zones can now be added, and reference counters automagically allocated for them within the end of the associated slab structures. uma_find_refcnt() does a kextract to fetch the slab struct reference from the underlying page, and lookup the corresponding refcnt. mbuma things worth noting: - integrates mbuf & cluster allocations with extended UMA and provides caches for commonly-allocated items; defines several zones (two primary, one secondary) and two kegs. - change up certain code paths that always used to do: m_get() + m_clget() to instead just use m_getcl() and try to take advantage of the newly defined secondary Packet zone. - netstat(1) and systat(1) quickly hacked up to do basic stat reporting but additional stats work needs to be done once some other details within UMA have been taken care of and it becomes clearer to how stats will work within the modified framework. From the user perspective, one implication is that the NMBCLUSTERS compile-time option is no longer used. The maximum number of clusters is still capped off according to maxusers, but it can be made unlimited by setting the kern.ipc.nmbclusters boot-time tunable to zero. Work should be done to write an appropriate sysctl handler allowing dynamic tuning of kern.ipc.nmbclusters at runtime. Additional things worth noting/known issues (READ): - One report of 'ips' (ServeRAID) driver acting really slow in conjunction with mbuma. Need more data. Latest report is that ips is equally sucking with and without mbuma. - Giant leak in NFS code sometimes occurs, can't reproduce but currently analyzing; brueffer is able to reproduce but THIS IS NOT an mbuma-specific problem and currently occurs even WITHOUT mbuma. - Issues in network locking: there is at least one code path in the rip code where one or more locks are acquired and we end up in m_prepend() with M_WAITOK, which causes WITNESS to whine from within UMA. Current temporary solution: force all UMA allocations to be M_NOWAIT from within UMA for now to avoid deadlocks unless WITNESS is defined and we can determine with certainty that we're not holding any locks when we're M_WAITOK. - I've seen at least one weird socketbuffer empty-but- mbuf-still-attached panic. I don't believe this to be related to mbuma but please keep your eyes open, turn on debugging, and capture crash dumps. This change removes more code than it adds. A paper is available detailing the change and considering various performance issues, it was presented at BSDCan2004: http://www.unixdaemons.com/~bmilekic/netbuf_bmilekic.pdf Please read the paper for Future Work and implementation details, as well as credits. Testing and Debugging: rwatson, brueffer, Ketrien I. Saihr-Kesenchedra, ... Reviewed by: Lots of people (for different parts)
2004-05-31 21:46:06 +00:00
{
struct mbuf *m;
struct mb_args *args;
After r254779 "error" must always be present in mb_ctor_pack(), not only when MAC is defined. Reported by: gjb / tinderbox Sponsored by: The FreeBSD Foundation
2013-08-24 21:25:53 +00:00
int error, flags;
Bring in mbuma to replace mballoc. mbuma is an Mbuf & Cluster allocator built on top of a number of extensions to the UMA framework, all included herein. Extensions to UMA worth noting: - Better layering between slab <-> zone caches; introduce Keg structure which splits off slab cache away from the zone structure and allows multiple zones to be stacked on top of a single Keg (single type of slab cache); perhaps we should look into defining a subset API on top of the Keg for special use by malloc(9), for example. - UMA_ZONE_REFCNT zones can now be added, and reference counters automagically allocated for them within the end of the associated slab structures. uma_find_refcnt() does a kextract to fetch the slab struct reference from the underlying page, and lookup the corresponding refcnt. mbuma things worth noting: - integrates mbuf & cluster allocations with extended UMA and provides caches for commonly-allocated items; defines several zones (two primary, one secondary) and two kegs. - change up certain code paths that always used to do: m_get() + m_clget() to instead just use m_getcl() and try to take advantage of the newly defined secondary Packet zone. - netstat(1) and systat(1) quickly hacked up to do basic stat reporting but additional stats work needs to be done once some other details within UMA have been taken care of and it becomes clearer to how stats will work within the modified framework. From the user perspective, one implication is that the NMBCLUSTERS compile-time option is no longer used. The maximum number of clusters is still capped off according to maxusers, but it can be made unlimited by setting the kern.ipc.nmbclusters boot-time tunable to zero. Work should be done to write an appropriate sysctl handler allowing dynamic tuning of kern.ipc.nmbclusters at runtime. Additional things worth noting/known issues (READ): - One report of 'ips' (ServeRAID) driver acting really slow in conjunction with mbuma. Need more data. Latest report is that ips is equally sucking with and without mbuma. - Giant leak in NFS code sometimes occurs, can't reproduce but currently analyzing; brueffer is able to reproduce but THIS IS NOT an mbuma-specific problem and currently occurs even WITHOUT mbuma. - Issues in network locking: there is at least one code path in the rip code where one or more locks are acquired and we end up in m_prepend() with M_WAITOK, which causes WITNESS to whine from within UMA. Current temporary solution: force all UMA allocations to be M_NOWAIT from within UMA for now to avoid deadlocks unless WITNESS is defined and we can determine with certainty that we're not holding any locks when we're M_WAITOK. - I've seen at least one weird socketbuffer empty-but- mbuf-still-attached panic. I don't believe this to be related to mbuma but please keep your eyes open, turn on debugging, and capture crash dumps. This change removes more code than it adds. A paper is available detailing the change and considering various performance issues, it was presented at BSDCan2004: http://www.unixdaemons.com/~bmilekic/netbuf_bmilekic.pdf Please read the paper for Future Work and implementation details, as well as credits. Testing and Debugging: rwatson, brueffer, Ketrien I. Saihr-Kesenchedra, ... Reviewed by: Lots of people (for different parts)
2004-05-31 21:46:06 +00:00
short type;
m = (struct mbuf *)mem;
args = (struct mb_args *)arg;
flags = args->flags;
type = args->type;
Plug leak in m_unshare. m_unshare passes on the source mbuf's flags as-is to m_getcl and this results in a leak if the flags include M_NOFREE. The fix is to clear the bits not listed in M_COPYALL before calling m_getcl. M_RDONLY should probably be filtered out too but that's outside the scope of this fix. Add assertions in the zone_mbuf and zone_pack ctors to catch similar bugs. Update netmap_get_mbuf to not pass M_NOFREE to m_getcl. It's not clear what the original code was trying to do but it's likely incorrect. Updated code is no different functionally but it avoids the newly added assertions. Reviewed by: gnn@ Sponsored by: Chelsio Communications Differential Revision: https://reviews.freebsd.org/D5698
2016-03-26 23:39:53 +00:00
MPASS((flags & M_NOFREE) == 0);
Bring in mbuma to replace mballoc. mbuma is an Mbuf & Cluster allocator built on top of a number of extensions to the UMA framework, all included herein. Extensions to UMA worth noting: - Better layering between slab <-> zone caches; introduce Keg structure which splits off slab cache away from the zone structure and allows multiple zones to be stacked on top of a single Keg (single type of slab cache); perhaps we should look into defining a subset API on top of the Keg for special use by malloc(9), for example. - UMA_ZONE_REFCNT zones can now be added, and reference counters automagically allocated for them within the end of the associated slab structures. uma_find_refcnt() does a kextract to fetch the slab struct reference from the underlying page, and lookup the corresponding refcnt. mbuma things worth noting: - integrates mbuf & cluster allocations with extended UMA and provides caches for commonly-allocated items; defines several zones (two primary, one secondary) and two kegs. - change up certain code paths that always used to do: m_get() + m_clget() to instead just use m_getcl() and try to take advantage of the newly defined secondary Packet zone. - netstat(1) and systat(1) quickly hacked up to do basic stat reporting but additional stats work needs to be done once some other details within UMA have been taken care of and it becomes clearer to how stats will work within the modified framework. From the user perspective, one implication is that the NMBCLUSTERS compile-time option is no longer used. The maximum number of clusters is still capped off according to maxusers, but it can be made unlimited by setting the kern.ipc.nmbclusters boot-time tunable to zero. Work should be done to write an appropriate sysctl handler allowing dynamic tuning of kern.ipc.nmbclusters at runtime. Additional things worth noting/known issues (READ): - One report of 'ips' (ServeRAID) driver acting really slow in conjunction with mbuma. Need more data. Latest report is that ips is equally sucking with and without mbuma. - Giant leak in NFS code sometimes occurs, can't reproduce but currently analyzing; brueffer is able to reproduce but THIS IS NOT an mbuma-specific problem and currently occurs even WITHOUT mbuma. - Issues in network locking: there is at least one code path in the rip code where one or more locks are acquired and we end up in m_prepend() with M_WAITOK, which causes WITNESS to whine from within UMA. Current temporary solution: force all UMA allocations to be M_NOWAIT from within UMA for now to avoid deadlocks unless WITNESS is defined and we can determine with certainty that we're not holding any locks when we're M_WAITOK. - I've seen at least one weird socketbuffer empty-but- mbuf-still-attached panic. I don't believe this to be related to mbuma but please keep your eyes open, turn on debugging, and capture crash dumps. This change removes more code than it adds. A paper is available detailing the change and considering various performance issues, it was presented at BSDCan2004: http://www.unixdaemons.com/~bmilekic/netbuf_bmilekic.pdf Please read the paper for Future Work and implementation details, as well as credits. Testing and Debugging: rwatson, brueffer, Ketrien I. Saihr-Kesenchedra, ... Reviewed by: Lots of people (for different parts)
2004-05-31 21:46:06 +00:00
Change the mbuf, mbuf cluster, and mbuf packet allocation routines so that the UMA "trash" allocator is used - this ensures that any writes to a freed mbuf should provoke a panic. Only enabled under INVARIANTS, of course. Approved by: re (scottl)
2005-06-23 04:33:39 +00:00
#ifdef INVARIANTS
trash_ctor(m->m_ext.ext_buf, MCLBYTES, arg, how);
#endif
Avoid code duplication for mbuf initialization and use m_init() instead in mb_ctor_mbuf() and mb_ctor_pack().
2013-08-24 12:24:58 +00:00
Garbage collect unused arguments of m_init().
2016-02-10 18:54:18 +00:00
error = m_init(m, how, type, flags);
Avoid code duplication for mbuf initialization and use m_init() instead in mb_ctor_mbuf() and mb_ctor_pack().
2013-08-24 12:24:58 +00:00
Mandatory mbuf cluster reference counting and groundwork for UMA based jumbo 9k and jumbo 16k cluster support. All mbuf's with external storage attached are mandatory reference counted. For clusters and jumbo clusters UMA provides the refcnt storage directly. It does not have to be separatly allocated. Any other type of external storage gets its own refcnt allocated from an UMA mbuf refcnt zone instead of normal kernel malloc. The refcount API MEXT_ADD_REF() and MEXT_REM_REF() is no longer publically accessible. The proper m_* functions have to be used. mb_ctor_clust() and mb_dtor_clust() both handle normal 2K as well as 9k and 16k clusters. Clusters and jumbo clusters may be obtained without attaching it immideatly to an mbuf. This is for high performance cluster allocation in network drivers where mbufs are attached after the cluster has been filled. Tested by: rwatson Sponsored by: TCP/IP Optimizations Fundraise 2005
2005-11-02 16:20:36 +00:00
/* m_ext is already initialized. */
Avoid code duplication for mbuf initialization and use m_init() instead in mb_ctor_mbuf() and mb_ctor_pack().
2013-08-24 12:24:58 +00:00
m->m_data = m->m_ext.ext_buf;
m->m_flags = (flags | M_EXT);
Mandatory mbuf cluster reference counting and groundwork for UMA based jumbo 9k and jumbo 16k cluster support. All mbuf's with external storage attached are mandatory reference counted. For clusters and jumbo clusters UMA provides the refcnt storage directly. It does not have to be separatly allocated. Any other type of external storage gets its own refcnt allocated from an UMA mbuf refcnt zone instead of normal kernel malloc. The refcount API MEXT_ADD_REF() and MEXT_REM_REF() is no longer publically accessible. The proper m_* functions have to be used. mb_ctor_clust() and mb_dtor_clust() both handle normal 2K as well as 9k and 16k clusters. Clusters and jumbo clusters may be obtained without attaching it immideatly to an mbuf. This is for high performance cluster allocation in network drivers where mbufs are attached after the cluster has been filled. Tested by: rwatson Sponsored by: TCP/IP Optimizations Fundraise 2005
2005-11-02 16:20:36 +00:00
Avoid code duplication for mbuf initialization and use m_init() instead in mb_ctor_mbuf() and mb_ctor_pack().
2013-08-24 12:24:58 +00:00
return (error);
Bring in mbuma to replace mballoc. mbuma is an Mbuf & Cluster allocator built on top of a number of extensions to the UMA framework, all included herein. Extensions to UMA worth noting: - Better layering between slab <-> zone caches; introduce Keg structure which splits off slab cache away from the zone structure and allows multiple zones to be stacked on top of a single Keg (single type of slab cache); perhaps we should look into defining a subset API on top of the Keg for special use by malloc(9), for example. - UMA_ZONE_REFCNT zones can now be added, and reference counters automagically allocated for them within the end of the associated slab structures. uma_find_refcnt() does a kextract to fetch the slab struct reference from the underlying page, and lookup the corresponding refcnt. mbuma things worth noting: - integrates mbuf & cluster allocations with extended UMA and provides caches for commonly-allocated items; defines several zones (two primary, one secondary) and two kegs. - change up certain code paths that always used to do: m_get() + m_clget() to instead just use m_getcl() and try to take advantage of the newly defined secondary Packet zone. - netstat(1) and systat(1) quickly hacked up to do basic stat reporting but additional stats work needs to be done once some other details within UMA have been taken care of and it becomes clearer to how stats will work within the modified framework. From the user perspective, one implication is that the NMBCLUSTERS compile-time option is no longer used. The maximum number of clusters is still capped off according to maxusers, but it can be made unlimited by setting the kern.ipc.nmbclusters boot-time tunable to zero. Work should be done to write an appropriate sysctl handler allowing dynamic tuning of kern.ipc.nmbclusters at runtime. Additional things worth noting/known issues (READ): - One report of 'ips' (ServeRAID) driver acting really slow in conjunction with mbuma. Need more data. Latest report is that ips is equally sucking with and without mbuma. - Giant leak in NFS code sometimes occurs, can't reproduce but currently analyzing; brueffer is able to reproduce but THIS IS NOT an mbuma-specific problem and currently occurs even WITHOUT mbuma. - Issues in network locking: there is at least one code path in the rip code where one or more locks are acquired and we end up in m_prepend() with M_WAITOK, which causes WITNESS to whine from within UMA. Current temporary solution: force all UMA allocations to be M_NOWAIT from within UMA for now to avoid deadlocks unless WITNESS is defined and we can determine with certainty that we're not holding any locks when we're M_WAITOK. - I've seen at least one weird socketbuffer empty-but- mbuf-still-attached panic. I don't believe this to be related to mbuma but please keep your eyes open, turn on debugging, and capture crash dumps. This change removes more code than it adds. A paper is available detailing the change and considering various performance issues, it was presented at BSDCan2004: http://www.unixdaemons.com/~bmilekic/netbuf_bmilekic.pdf Please read the paper for Future Work and implementation details, as well as credits. Testing and Debugging: rwatson, brueffer, Ketrien I. Saihr-Kesenchedra, ... Reviewed by: Lots of people (for different parts)
2004-05-31 21:46:06 +00:00
}
/*
Redo r292484. Embed task(9) into zone, so that uz_maxaction is called in a context that can sleep, allowing consumers of the KPI to run their drain routines without any extra measures. Discussed with: jtl
2016-02-03 23:30:17 +00:00
* This is the protocol drain routine. Called by UMA whenever any of the
* mbuf zones is closed to its limit.
Bring in mbuma to replace mballoc. mbuma is an Mbuf & Cluster allocator built on top of a number of extensions to the UMA framework, all included herein. Extensions to UMA worth noting: - Better layering between slab <-> zone caches; introduce Keg structure which splits off slab cache away from the zone structure and allows multiple zones to be stacked on top of a single Keg (single type of slab cache); perhaps we should look into defining a subset API on top of the Keg for special use by malloc(9), for example. - UMA_ZONE_REFCNT zones can now be added, and reference counters automagically allocated for them within the end of the associated slab structures. uma_find_refcnt() does a kextract to fetch the slab struct reference from the underlying page, and lookup the corresponding refcnt. mbuma things worth noting: - integrates mbuf & cluster allocations with extended UMA and provides caches for commonly-allocated items; defines several zones (two primary, one secondary) and two kegs. - change up certain code paths that always used to do: m_get() + m_clget() to instead just use m_getcl() and try to take advantage of the newly defined secondary Packet zone. - netstat(1) and systat(1) quickly hacked up to do basic stat reporting but additional stats work needs to be done once some other details within UMA have been taken care of and it becomes clearer to how stats will work within the modified framework. From the user perspective, one implication is that the NMBCLUSTERS compile-time option is no longer used. The maximum number of clusters is still capped off according to maxusers, but it can be made unlimited by setting the kern.ipc.nmbclusters boot-time tunable to zero. Work should be done to write an appropriate sysctl handler allowing dynamic tuning of kern.ipc.nmbclusters at runtime. Additional things worth noting/known issues (READ): - One report of 'ips' (ServeRAID) driver acting really slow in conjunction with mbuma. Need more data. Latest report is that ips is equally sucking with and without mbuma. - Giant leak in NFS code sometimes occurs, can't reproduce but currently analyzing; brueffer is able to reproduce but THIS IS NOT an mbuma-specific problem and currently occurs even WITHOUT mbuma. - Issues in network locking: there is at least one code path in the rip code where one or more locks are acquired and we end up in m_prepend() with M_WAITOK, which causes WITNESS to whine from within UMA. Current temporary solution: force all UMA allocations to be M_NOWAIT from within UMA for now to avoid deadlocks unless WITNESS is defined and we can determine with certainty that we're not holding any locks when we're M_WAITOK. - I've seen at least one weird socketbuffer empty-but- mbuf-still-attached panic. I don't believe this to be related to mbuma but please keep your eyes open, turn on debugging, and capture crash dumps. This change removes more code than it adds. A paper is available detailing the change and considering various performance issues, it was presented at BSDCan2004: http://www.unixdaemons.com/~bmilekic/netbuf_bmilekic.pdf Please read the paper for Future Work and implementation details, as well as credits. Testing and Debugging: rwatson, brueffer, Ketrien I. Saihr-Kesenchedra, ... Reviewed by: Lots of people (for different parts)
2004-05-31 21:46:06 +00:00
*
* No locks should be held when this is called. The drain routines have to
* presently acquire some locks which raises the possibility of lock order
* reversal.
*/
static void
Redo r292484. Embed task(9) into zone, so that uz_maxaction is called in a context that can sleep, allowing consumers of the KPI to run their drain routines without any extra measures. Discussed with: jtl
2016-02-03 23:30:17 +00:00
mb_reclaim(uma_zone_t zone __unused, int pending __unused)
Bring in mbuma to replace mballoc. mbuma is an Mbuf & Cluster allocator built on top of a number of extensions to the UMA framework, all included herein. Extensions to UMA worth noting: - Better layering between slab <-> zone caches; introduce Keg structure which splits off slab cache away from the zone structure and allows multiple zones to be stacked on top of a single Keg (single type of slab cache); perhaps we should look into defining a subset API on top of the Keg for special use by malloc(9), for example. - UMA_ZONE_REFCNT zones can now be added, and reference counters automagically allocated for them within the end of the associated slab structures. uma_find_refcnt() does a kextract to fetch the slab struct reference from the underlying page, and lookup the corresponding refcnt. mbuma things worth noting: - integrates mbuf & cluster allocations with extended UMA and provides caches for commonly-allocated items; defines several zones (two primary, one secondary) and two kegs. - change up certain code paths that always used to do: m_get() + m_clget() to instead just use m_getcl() and try to take advantage of the newly defined secondary Packet zone. - netstat(1) and systat(1) quickly hacked up to do basic stat reporting but additional stats work needs to be done once some other details within UMA have been taken care of and it becomes clearer to how stats will work within the modified framework. From the user perspective, one implication is that the NMBCLUSTERS compile-time option is no longer used. The maximum number of clusters is still capped off according to maxusers, but it can be made unlimited by setting the kern.ipc.nmbclusters boot-time tunable to zero. Work should be done to write an appropriate sysctl handler allowing dynamic tuning of kern.ipc.nmbclusters at runtime. Additional things worth noting/known issues (READ): - One report of 'ips' (ServeRAID) driver acting really slow in conjunction with mbuma. Need more data. Latest report is that ips is equally sucking with and without mbuma. - Giant leak in NFS code sometimes occurs, can't reproduce but currently analyzing; brueffer is able to reproduce but THIS IS NOT an mbuma-specific problem and currently occurs even WITHOUT mbuma. - Issues in network locking: there is at least one code path in the rip code where one or more locks are acquired and we end up in m_prepend() with M_WAITOK, which causes WITNESS to whine from within UMA. Current temporary solution: force all UMA allocations to be M_NOWAIT from within UMA for now to avoid deadlocks unless WITNESS is defined and we can determine with certainty that we're not holding any locks when we're M_WAITOK. - I've seen at least one weird socketbuffer empty-but- mbuf-still-attached panic. I don't believe this to be related to mbuma but please keep your eyes open, turn on debugging, and capture crash dumps. This change removes more code than it adds. A paper is available detailing the change and considering various performance issues, it was presented at BSDCan2004: http://www.unixdaemons.com/~bmilekic/netbuf_bmilekic.pdf Please read the paper for Future Work and implementation details, as well as credits. Testing and Debugging: rwatson, brueffer, Ketrien I. Saihr-Kesenchedra, ... Reviewed by: Lots of people (for different parts)
2004-05-31 21:46:06 +00:00
{
Couple protocol drain routines (frag6_drain and sctp_drain) may send packets. An unexpected behaviour for memory reclamation routine. Anyway, we need enter the network epoch for doing that.
2020-02-03 20:48:57 +00:00
struct epoch_tracker et;
Bring in mbuma to replace mballoc. mbuma is an Mbuf & Cluster allocator built on top of a number of extensions to the UMA framework, all included herein. Extensions to UMA worth noting: - Better layering between slab <-> zone caches; introduce Keg structure which splits off slab cache away from the zone structure and allows multiple zones to be stacked on top of a single Keg (single type of slab cache); perhaps we should look into defining a subset API on top of the Keg for special use by malloc(9), for example. - UMA_ZONE_REFCNT zones can now be added, and reference counters automagically allocated for them within the end of the associated slab structures. uma_find_refcnt() does a kextract to fetch the slab struct reference from the underlying page, and lookup the corresponding refcnt. mbuma things worth noting: - integrates mbuf & cluster allocations with extended UMA and provides caches for commonly-allocated items; defines several zones (two primary, one secondary) and two kegs. - change up certain code paths that always used to do: m_get() + m_clget() to instead just use m_getcl() and try to take advantage of the newly defined secondary Packet zone. - netstat(1) and systat(1) quickly hacked up to do basic stat reporting but additional stats work needs to be done once some other details within UMA have been taken care of and it becomes clearer to how stats will work within the modified framework. From the user perspective, one implication is that the NMBCLUSTERS compile-time option is no longer used. The maximum number of clusters is still capped off according to maxusers, but it can be made unlimited by setting the kern.ipc.nmbclusters boot-time tunable to zero. Work should be done to write an appropriate sysctl handler allowing dynamic tuning of kern.ipc.nmbclusters at runtime. Additional things worth noting/known issues (READ): - One report of 'ips' (ServeRAID) driver acting really slow in conjunction with mbuma. Need more data. Latest report is that ips is equally sucking with and without mbuma. - Giant leak in NFS code sometimes occurs, can't reproduce but currently analyzing; brueffer is able to reproduce but THIS IS NOT an mbuma-specific problem and currently occurs even WITHOUT mbuma. - Issues in network locking: there is at least one code path in the rip code where one or more locks are acquired and we end up in m_prepend() with M_WAITOK, which causes WITNESS to whine from within UMA. Current temporary solution: force all UMA allocations to be M_NOWAIT from within UMA for now to avoid deadlocks unless WITNESS is defined and we can determine with certainty that we're not holding any locks when we're M_WAITOK. - I've seen at least one weird socketbuffer empty-but- mbuf-still-attached panic. I don't believe this to be related to mbuma but please keep your eyes open, turn on debugging, and capture crash dumps. This change removes more code than it adds. A paper is available detailing the change and considering various performance issues, it was presented at BSDCan2004: http://www.unixdaemons.com/~bmilekic/netbuf_bmilekic.pdf Please read the paper for Future Work and implementation details, as well as credits. Testing and Debugging: rwatson, brueffer, Ketrien I. Saihr-Kesenchedra, ... Reviewed by: Lots of people (for different parts)
2004-05-31 21:46:06 +00:00
struct domain *dp;
struct protosw *pr;
Redo r292484. Embed task(9) into zone, so that uz_maxaction is called in a context that can sleep, allowing consumers of the KPI to run their drain routines without any extra measures. Discussed with: jtl
2016-02-03 23:30:17 +00:00
WITNESS_WARN(WARN_GIANTOK | WARN_SLEEPOK | WARN_PANIC, NULL, __func__);
Bring in mbuma to replace mballoc. mbuma is an Mbuf & Cluster allocator built on top of a number of extensions to the UMA framework, all included herein. Extensions to UMA worth noting: - Better layering between slab <-> zone caches; introduce Keg structure which splits off slab cache away from the zone structure and allows multiple zones to be stacked on top of a single Keg (single type of slab cache); perhaps we should look into defining a subset API on top of the Keg for special use by malloc(9), for example. - UMA_ZONE_REFCNT zones can now be added, and reference counters automagically allocated for them within the end of the associated slab structures. uma_find_refcnt() does a kextract to fetch the slab struct reference from the underlying page, and lookup the corresponding refcnt. mbuma things worth noting: - integrates mbuf & cluster allocations with extended UMA and provides caches for commonly-allocated items; defines several zones (two primary, one secondary) and two kegs. - change up certain code paths that always used to do: m_get() + m_clget() to instead just use m_getcl() and try to take advantage of the newly defined secondary Packet zone. - netstat(1) and systat(1) quickly hacked up to do basic stat reporting but additional stats work needs to be done once some other details within UMA have been taken care of and it becomes clearer to how stats will work within the modified framework. From the user perspective, one implication is that the NMBCLUSTERS compile-time option is no longer used. The maximum number of clusters is still capped off according to maxusers, but it can be made unlimited by setting the kern.ipc.nmbclusters boot-time tunable to zero. Work should be done to write an appropriate sysctl handler allowing dynamic tuning of kern.ipc.nmbclusters at runtime. Additional things worth noting/known issues (READ): - One report of 'ips' (ServeRAID) driver acting really slow in conjunction with mbuma. Need more data. Latest report is that ips is equally sucking with and without mbuma. - Giant leak in NFS code sometimes occurs, can't reproduce but currently analyzing; brueffer is able to reproduce but THIS IS NOT an mbuma-specific problem and currently occurs even WITHOUT mbuma. - Issues in network locking: there is at least one code path in the rip code where one or more locks are acquired and we end up in m_prepend() with M_WAITOK, which causes WITNESS to whine from within UMA. Current temporary solution: force all UMA allocations to be M_NOWAIT from within UMA for now to avoid deadlocks unless WITNESS is defined and we can determine with certainty that we're not holding any locks when we're M_WAITOK. - I've seen at least one weird socketbuffer empty-but- mbuf-still-attached panic. I don't believe this to be related to mbuma but please keep your eyes open, turn on debugging, and capture crash dumps. This change removes more code than it adds. A paper is available detailing the change and considering various performance issues, it was presented at BSDCan2004: http://www.unixdaemons.com/~bmilekic/netbuf_bmilekic.pdf Please read the paper for Future Work and implementation details, as well as credits. Testing and Debugging: rwatson, brueffer, Ketrien I. Saihr-Kesenchedra, ... Reviewed by: Lots of people (for different parts)
2004-05-31 21:46:06 +00:00
Couple protocol drain routines (frag6_drain and sctp_drain) may send packets. An unexpected behaviour for memory reclamation routine. Anyway, we need enter the network epoch for doing that.
2020-02-03 20:48:57 +00:00
NET_EPOCH_ENTER(et);
Bring in mbuma to replace mballoc. mbuma is an Mbuf & Cluster allocator built on top of a number of extensions to the UMA framework, all included herein. Extensions to UMA worth noting: - Better layering between slab <-> zone caches; introduce Keg structure which splits off slab cache away from the zone structure and allows multiple zones to be stacked on top of a single Keg (single type of slab cache); perhaps we should look into defining a subset API on top of the Keg for special use by malloc(9), for example. - UMA_ZONE_REFCNT zones can now be added, and reference counters automagically allocated for them within the end of the associated slab structures. uma_find_refcnt() does a kextract to fetch the slab struct reference from the underlying page, and lookup the corresponding refcnt. mbuma things worth noting: - integrates mbuf & cluster allocations with extended UMA and provides caches for commonly-allocated items; defines several zones (two primary, one secondary) and two kegs. - change up certain code paths that always used to do: m_get() + m_clget() to instead just use m_getcl() and try to take advantage of the newly defined secondary Packet zone. - netstat(1) and systat(1) quickly hacked up to do basic stat reporting but additional stats work needs to be done once some other details within UMA have been taken care of and it becomes clearer to how stats will work within the modified framework. From the user perspective, one implication is that the NMBCLUSTERS compile-time option is no longer used. The maximum number of clusters is still capped off according to maxusers, but it can be made unlimited by setting the kern.ipc.nmbclusters boot-time tunable to zero. Work should be done to write an appropriate sysctl handler allowing dynamic tuning of kern.ipc.nmbclusters at runtime. Additional things worth noting/known issues (READ): - One report of 'ips' (ServeRAID) driver acting really slow in conjunction with mbuma. Need more data. Latest report is that ips is equally sucking with and without mbuma. - Giant leak in NFS code sometimes occurs, can't reproduce but currently analyzing; brueffer is able to reproduce but THIS IS NOT an mbuma-specific problem and currently occurs even WITHOUT mbuma. - Issues in network locking: there is at least one code path in the rip code where one or more locks are acquired and we end up in m_prepend() with M_WAITOK, which causes WITNESS to whine from within UMA. Current temporary solution: force all UMA allocations to be M_NOWAIT from within UMA for now to avoid deadlocks unless WITNESS is defined and we can determine with certainty that we're not holding any locks when we're M_WAITOK. - I've seen at least one weird socketbuffer empty-but- mbuf-still-attached panic. I don't believe this to be related to mbuma but please keep your eyes open, turn on debugging, and capture crash dumps. This change removes more code than it adds. A paper is available detailing the change and considering various performance issues, it was presented at BSDCan2004: http://www.unixdaemons.com/~bmilekic/netbuf_bmilekic.pdf Please read the paper for Future Work and implementation details, as well as credits. Testing and Debugging: rwatson, brueffer, Ketrien I. Saihr-Kesenchedra, ... Reviewed by: Lots of people (for different parts)
2004-05-31 21:46:06 +00:00
for (dp = domains; dp != NULL; dp = dp->dom_next)
for (pr = dp->dom_protosw; pr < dp->dom_protoswNPROTOSW; pr++)
if (pr->pr_drain != NULL)
(*pr->pr_drain)();
Couple protocol drain routines (frag6_drain and sctp_drain) may send packets. An unexpected behaviour for memory reclamation routine. Anyway, we need enter the network epoch for doing that.
2020-02-03 20:48:57 +00:00
NET_EPOCH_EXIT(et);
Bring in mbuma to replace mballoc. mbuma is an Mbuf & Cluster allocator built on top of a number of extensions to the UMA framework, all included herein. Extensions to UMA worth noting: - Better layering between slab <-> zone caches; introduce Keg structure which splits off slab cache away from the zone structure and allows multiple zones to be stacked on top of a single Keg (single type of slab cache); perhaps we should look into defining a subset API on top of the Keg for special use by malloc(9), for example. - UMA_ZONE_REFCNT zones can now be added, and reference counters automagically allocated for them within the end of the associated slab structures. uma_find_refcnt() does a kextract to fetch the slab struct reference from the underlying page, and lookup the corresponding refcnt. mbuma things worth noting: - integrates mbuf & cluster allocations with extended UMA and provides caches for commonly-allocated items; defines several zones (two primary, one secondary) and two kegs. - change up certain code paths that always used to do: m_get() + m_clget() to instead just use m_getcl() and try to take advantage of the newly defined secondary Packet zone. - netstat(1) and systat(1) quickly hacked up to do basic stat reporting but additional stats work needs to be done once some other details within UMA have been taken care of and it becomes clearer to how stats will work within the modified framework. From the user perspective, one implication is that the NMBCLUSTERS compile-time option is no longer used. The maximum number of clusters is still capped off according to maxusers, but it can be made unlimited by setting the kern.ipc.nmbclusters boot-time tunable to zero. Work should be done to write an appropriate sysctl handler allowing dynamic tuning of kern.ipc.nmbclusters at runtime. Additional things worth noting/known issues (READ): - One report of 'ips' (ServeRAID) driver acting really slow in conjunction with mbuma. Need more data. Latest report is that ips is equally sucking with and without mbuma. - Giant leak in NFS code sometimes occurs, can't reproduce but currently analyzing; brueffer is able to reproduce but THIS IS NOT an mbuma-specific problem and currently occurs even WITHOUT mbuma. - Issues in network locking: there is at least one code path in the rip code where one or more locks are acquired and we end up in m_prepend() with M_WAITOK, which causes WITNESS to whine from within UMA. Current temporary solution: force all UMA allocations to be M_NOWAIT from within UMA for now to avoid deadlocks unless WITNESS is defined and we can determine with certainty that we're not holding any locks when we're M_WAITOK. - I've seen at least one weird socketbuffer empty-but- mbuf-still-attached panic. I don't believe this to be related to mbuma but please keep your eyes open, turn on debugging, and capture crash dumps. This change removes more code than it adds. A paper is available detailing the change and considering various performance issues, it was presented at BSDCan2004: http://www.unixdaemons.com/~bmilekic/netbuf_bmilekic.pdf Please read the paper for Future Work and implementation details, as well as credits. Testing and Debugging: rwatson, brueffer, Ketrien I. Saihr-Kesenchedra, ... Reviewed by: Lots of people (for different parts)
2004-05-31 21:46:06 +00:00
}
o Gather all mbuf(9) allocation functions into kern_mbuf.c, and all mbuf(9) manipulation functions into uipc_mbuf.c. This looks like the initial intent, but had diffused in the last decade. o Gather all declarations in mbuf.h in one place and sort them. o Uninline m_clget() and m_cljget(). There are no functional changes in this patch. The patch comes from a larger version, where all mbuf(9) allocation was uninlined, which allowed to make mbuf(9) UMA zones private to kern_mbuf.c. The performance impact of the total uninlining is still unclear, so we are holding on now with larger version. Together with: melifaro, olivier
2016-02-11 21:32:23 +00:00
Add an external mbuf buffer type that holds multiple unmapped pages. Unmapped mbufs allow sendfile to carry multiple pages of data in a single mbuf, without mapping those pages. It is a requirement for Netflix's in-kernel TLS, and provides a 5-10% CPU savings on heavy web serving workloads when used by sendfile, due to effectively compressing socket buffers by an order of magnitude, and hence reducing cache misses. For this new external mbuf buffer type (EXT_PGS), the ext_buf pointer now points to a struct mbuf_ext_pgs structure instead of a data buffer. This structure contains an array of physical addresses (this reduces cache misses compared to an earlier version that stored an array of vm_page_t pointers). It also stores additional fields needed for in-kernel TLS such as the TLS header and trailer data that are currently unused. To more easily detect these mbufs, the M_NOMAP flag is set in m_flags in addition to M_EXT. Various functions like m_copydata() have been updated to safely access packet contents (using uiomove_fromphys()), to make things like BPF safe. NIC drivers advertise support for unmapped mbufs on transmit via a new IFCAP_NOMAP capability. This capability can be toggled via the new 'nomap' and '-nomap' ifconfig(8) commands. For NIC drivers that only transmit packet contents via DMA and use bus_dma, adding the capability to if_capabilities and if_capenable should be all that is required. If a NIC does not support unmapped mbufs, they are converted to a chain of mapped mbufs (using sf_bufs to provide the mapping) in ip_output or ip6_output. If an unmapped mbuf requires software checksums, it is also converted to a chain of mapped mbufs before computing the checksum. Submitted by: gallatin (earlier version) Reviewed by: gallatin, hselasky, rrs Discussed with: ae, kp (firewalls) Relnotes: yes Sponsored by: Netflix Differential Revision: https://reviews.freebsd.org/D20616
2019-06-29 00:48:33 +00:00
/*
* Free "count" units of I/O from an mbuf chain. They could be held
Step 4.2: start divorce of M_EXT and M_EXTPG They have more differencies than similarities. For now there is lots of code that would check for M_EXT only and work correctly on M_EXTPG buffers, so still carry M_EXT bit together with M_EXTPG. However, prepare some code for explicit check for M_EXTPG. Reviewed by: gallatin Differential Revision: https://reviews.freebsd.org/D24598
2020-05-03 00:37:16 +00:00
* in M_EXTPG or just as a normal mbuf. This code is intended to be
Add an external mbuf buffer type that holds multiple unmapped pages. Unmapped mbufs allow sendfile to carry multiple pages of data in a single mbuf, without mapping those pages. It is a requirement for Netflix's in-kernel TLS, and provides a 5-10% CPU savings on heavy web serving workloads when used by sendfile, due to effectively compressing socket buffers by an order of magnitude, and hence reducing cache misses. For this new external mbuf buffer type (EXT_PGS), the ext_buf pointer now points to a struct mbuf_ext_pgs structure instead of a data buffer. This structure contains an array of physical addresses (this reduces cache misses compared to an earlier version that stored an array of vm_page_t pointers). It also stores additional fields needed for in-kernel TLS such as the TLS header and trailer data that are currently unused. To more easily detect these mbufs, the M_NOMAP flag is set in m_flags in addition to M_EXT. Various functions like m_copydata() have been updated to safely access packet contents (using uiomove_fromphys()), to make things like BPF safe. NIC drivers advertise support for unmapped mbufs on transmit via a new IFCAP_NOMAP capability. This capability can be toggled via the new 'nomap' and '-nomap' ifconfig(8) commands. For NIC drivers that only transmit packet contents via DMA and use bus_dma, adding the capability to if_capabilities and if_capenable should be all that is required. If a NIC does not support unmapped mbufs, they are converted to a chain of mapped mbufs (using sf_bufs to provide the mapping) in ip_output or ip6_output. If an unmapped mbuf requires software checksums, it is also converted to a chain of mapped mbufs before computing the checksum. Submitted by: gallatin (earlier version) Reviewed by: gallatin, hselasky, rrs Discussed with: ae, kp (firewalls) Relnotes: yes Sponsored by: Netflix Differential Revision: https://reviews.freebsd.org/D20616
2019-06-29 00:48:33 +00:00
* called in an error path (I/O error, closed connection, etc).
*/
void
mb_free_notready(struct mbuf *m, int count)
{
int i;
for (i = 0; i < count && m != NULL; i++) {
Step 4.2: start divorce of M_EXT and M_EXTPG They have more differencies than similarities. For now there is lots of code that would check for M_EXT only and work correctly on M_EXTPG buffers, so still carry M_EXT bit together with M_EXTPG. However, prepare some code for explicit check for M_EXTPG. Reviewed by: gallatin Differential Revision: https://reviews.freebsd.org/D24598
2020-05-03 00:37:16 +00:00
if ((m->m_flags & M_EXTPG) != 0) {
Step 3: anonymize struct mbuf_ext_pgs and move all its fields into mbuf within m_epg namespace. All edits except the 'struct mbuf' declaration and mb_dupcl() were done mechanically with sed: s/->m_ext_pgs.nrdy/->m_epg_nrdy/g s/->m_ext_pgs.hdr_len/->m_epg_hdrlen/g s/->m_ext_pgs.trail_len/->m_epg_trllen/g s/->m_ext_pgs.first_pg_off/->m_epg_1st_off/g s/->m_ext_pgs.last_pg_len/->m_epg_last_len/g s/->m_ext_pgs.flags/->m_epg_flags/g s/->m_ext_pgs.record_type/->m_epg_record_type/g s/->m_ext_pgs.enc_cnt/->m_epg_enc_cnt/g s/->m_ext_pgs.tls/->m_epg_tls/g s/->m_ext_pgs.so/->m_epg_so/g s/->m_ext_pgs.seqno/->m_epg_seqno/g s/->m_ext_pgs.stailq/->m_epg_stailq/g Reviewed by: gallatin Differential Revision: https://reviews.freebsd.org/D24598
2020-05-03 00:12:56 +00:00
m->m_epg_nrdy--;
if (m->m_epg_nrdy != 0)
Add an external mbuf buffer type that holds multiple unmapped pages. Unmapped mbufs allow sendfile to carry multiple pages of data in a single mbuf, without mapping those pages. It is a requirement for Netflix's in-kernel TLS, and provides a 5-10% CPU savings on heavy web serving workloads when used by sendfile, due to effectively compressing socket buffers by an order of magnitude, and hence reducing cache misses. For this new external mbuf buffer type (EXT_PGS), the ext_buf pointer now points to a struct mbuf_ext_pgs structure instead of a data buffer. This structure contains an array of physical addresses (this reduces cache misses compared to an earlier version that stored an array of vm_page_t pointers). It also stores additional fields needed for in-kernel TLS such as the TLS header and trailer data that are currently unused. To more easily detect these mbufs, the M_NOMAP flag is set in m_flags in addition to M_EXT. Various functions like m_copydata() have been updated to safely access packet contents (using uiomove_fromphys()), to make things like BPF safe. NIC drivers advertise support for unmapped mbufs on transmit via a new IFCAP_NOMAP capability. This capability can be toggled via the new 'nomap' and '-nomap' ifconfig(8) commands. For NIC drivers that only transmit packet contents via DMA and use bus_dma, adding the capability to if_capabilities and if_capenable should be all that is required. If a NIC does not support unmapped mbufs, they are converted to a chain of mapped mbufs (using sf_bufs to provide the mapping) in ip_output or ip6_output. If an unmapped mbuf requires software checksums, it is also converted to a chain of mapped mbufs before computing the checksum. Submitted by: gallatin (earlier version) Reviewed by: gallatin, hselasky, rrs Discussed with: ae, kp (firewalls) Relnotes: yes Sponsored by: Netflix Differential Revision: https://reviews.freebsd.org/D20616
2019-06-29 00:48:33 +00:00
continue;
}
m = m_free(m);
}
KASSERT(i == count, ("Removed only %d items from %p", i, m));
}
/*
* Compress an unmapped mbuf into a simple mbuf when it holds a small
* amount of data. This is used as a DOS defense to avoid having
* small packets tie up wired pages, an ext_pgs structure, and an
* mbuf. Since this converts the existing mbuf in place, it can only
* be used if there are no other references to 'm'.
*/
int
mb_unmapped_compress(struct mbuf *m)
{
volatile u_int *refcnt;
In mb_unmapped_compress() we don't need mbuf structure to keep data, but we need buffer of MLEN bytes. This isn't just a simplification, but important fixup, because previous commit shrinked sizeof(struct mbuf) down below MSIZE, and instantiating an mbuf on stack no longer provides enough data. Reviewed by: gallatin Differential Revision: https://reviews.freebsd.org/D24598
2020-05-02 22:44:23 +00:00
char buf[MLEN];
Add an external mbuf buffer type that holds multiple unmapped pages. Unmapped mbufs allow sendfile to carry multiple pages of data in a single mbuf, without mapping those pages. It is a requirement for Netflix's in-kernel TLS, and provides a 5-10% CPU savings on heavy web serving workloads when used by sendfile, due to effectively compressing socket buffers by an order of magnitude, and hence reducing cache misses. For this new external mbuf buffer type (EXT_PGS), the ext_buf pointer now points to a struct mbuf_ext_pgs structure instead of a data buffer. This structure contains an array of physical addresses (this reduces cache misses compared to an earlier version that stored an array of vm_page_t pointers). It also stores additional fields needed for in-kernel TLS such as the TLS header and trailer data that are currently unused. To more easily detect these mbufs, the M_NOMAP flag is set in m_flags in addition to M_EXT. Various functions like m_copydata() have been updated to safely access packet contents (using uiomove_fromphys()), to make things like BPF safe. NIC drivers advertise support for unmapped mbufs on transmit via a new IFCAP_NOMAP capability. This capability can be toggled via the new 'nomap' and '-nomap' ifconfig(8) commands. For NIC drivers that only transmit packet contents via DMA and use bus_dma, adding the capability to if_capabilities and if_capenable should be all that is required. If a NIC does not support unmapped mbufs, they are converted to a chain of mapped mbufs (using sf_bufs to provide the mapping) in ip_output or ip6_output. If an unmapped mbuf requires software checksums, it is also converted to a chain of mapped mbufs before computing the checksum. Submitted by: gallatin (earlier version) Reviewed by: gallatin, hselasky, rrs Discussed with: ae, kp (firewalls) Relnotes: yes Sponsored by: Netflix Differential Revision: https://reviews.freebsd.org/D20616
2019-06-29 00:48:33 +00:00
/*
* Assert that 'm' does not have a packet header. If 'm' had
* a packet header, it would only be able to hold MHLEN bytes
* and m_data would have to be initialized differently.
*/
Step 4.2: start divorce of M_EXT and M_EXTPG They have more differencies than similarities. For now there is lots of code that would check for M_EXT only and work correctly on M_EXTPG buffers, so still carry M_EXT bit together with M_EXTPG. However, prepare some code for explicit check for M_EXTPG. Reviewed by: gallatin Differential Revision: https://reviews.freebsd.org/D24598
2020-05-03 00:37:16 +00:00
KASSERT((m->m_flags & M_PKTHDR) == 0 && (m->m_flags & M_EXTPG),
("%s: m %p !M_EXTPG or M_PKTHDR", __func__, m));
Add an external mbuf buffer type that holds multiple unmapped pages. Unmapped mbufs allow sendfile to carry multiple pages of data in a single mbuf, without mapping those pages. It is a requirement for Netflix's in-kernel TLS, and provides a 5-10% CPU savings on heavy web serving workloads when used by sendfile, due to effectively compressing socket buffers by an order of magnitude, and hence reducing cache misses. For this new external mbuf buffer type (EXT_PGS), the ext_buf pointer now points to a struct mbuf_ext_pgs structure instead of a data buffer. This structure contains an array of physical addresses (this reduces cache misses compared to an earlier version that stored an array of vm_page_t pointers). It also stores additional fields needed for in-kernel TLS such as the TLS header and trailer data that are currently unused. To more easily detect these mbufs, the M_NOMAP flag is set in m_flags in addition to M_EXT. Various functions like m_copydata() have been updated to safely access packet contents (using uiomove_fromphys()), to make things like BPF safe. NIC drivers advertise support for unmapped mbufs on transmit via a new IFCAP_NOMAP capability. This capability can be toggled via the new 'nomap' and '-nomap' ifconfig(8) commands. For NIC drivers that only transmit packet contents via DMA and use bus_dma, adding the capability to if_capabilities and if_capenable should be all that is required. If a NIC does not support unmapped mbufs, they are converted to a chain of mapped mbufs (using sf_bufs to provide the mapping) in ip_output or ip6_output. If an unmapped mbuf requires software checksums, it is also converted to a chain of mapped mbufs before computing the checksum. Submitted by: gallatin (earlier version) Reviewed by: gallatin, hselasky, rrs Discussed with: ae, kp (firewalls) Relnotes: yes Sponsored by: Netflix Differential Revision: https://reviews.freebsd.org/D20616
2019-06-29 00:48:33 +00:00
KASSERT(m->m_len <= MLEN, ("m_len too large %p", m));
if (m->m_ext.ext_flags & EXT_FLAG_EMBREF) {
refcnt = &m->m_ext.ext_count;
} else {
KASSERT(m->m_ext.ext_cnt != NULL,
("%s: no refcounting pointer on %p", __func__, m));
refcnt = m->m_ext.ext_cnt;
}
if (*refcnt != 1)
return (EBUSY);
In mb_unmapped_compress() we don't need mbuf structure to keep data, but we need buffer of MLEN bytes. This isn't just a simplification, but important fixup, because previous commit shrinked sizeof(struct mbuf) down below MSIZE, and instantiating an mbuf on stack no longer provides enough data. Reviewed by: gallatin Differential Revision: https://reviews.freebsd.org/D24598
2020-05-02 22:44:23 +00:00
m_copydata(m, 0, m->m_len, buf);
KTLS: Re-work unmapped mbufs to carry ext_pgs in the mbuf itself. While the original implementation of unmapped mbufs was a large step forward in terms of reducing cache misses by enabling mbufs to carry more than a single page for sendfile, they are rather cache unfriendly when accessing the ext_pgs metadata and data. This is because the ext_pgs part of the mbuf is allocated separately, and almost guaranteed to be cold in cache. This change takes advantage of the fact that unmapped mbufs are never used at the same time as pkthdr mbufs. Given this fact, we can overlap the ext_pgs metadata with the mbuf pkthdr, and carry the ext_pgs meta directly in the mbuf itself. Similarly, we can carry the ext_pgs data (TLS hdr/trailer/array of pages) directly after the existing m_ext. In order to be able to carry 5 pages (which is the minimum required for a 16K TLS record which is not perfectly aligned) on LP64, I've had to steal ext_arg2. The only user of this in the xmit path is sendfile, and I've adjusted it to use arg1 when using unmapped mbufs. This change is almost entirely mechanical, except that we change mb_alloc_ext_pgs() to no longer allow allocating pkthdrs, the change to avoid ext_arg2 as mentioned above, and the removal of the ext_pgs zone, This change saves roughly 2% "raw" CPU (~59% -> 57%), or over 3% "scaled" CPU on a Netflix 100% software kTLS workload at 90+ Gb/s on Broadwell Xeons. In a follow-on commit, I plan to remove some hacks to avoid access ext_pgs fields of mbufs, since they will now be in cache. Many thanks to glebius for helping to make this better in the Netflix tree. Reviewed by: hselasky, jhb, rrs, glebius (early version) Sponsored by: Netflix Differential Revision: https://reviews.freebsd.org/D24213
2020-04-14 14:46:06 +00:00
/* Free the backing pages. */
m->m_ext.ext_free(m);
Add an external mbuf buffer type that holds multiple unmapped pages. Unmapped mbufs allow sendfile to carry multiple pages of data in a single mbuf, without mapping those pages. It is a requirement for Netflix's in-kernel TLS, and provides a 5-10% CPU savings on heavy web serving workloads when used by sendfile, due to effectively compressing socket buffers by an order of magnitude, and hence reducing cache misses. For this new external mbuf buffer type (EXT_PGS), the ext_buf pointer now points to a struct mbuf_ext_pgs structure instead of a data buffer. This structure contains an array of physical addresses (this reduces cache misses compared to an earlier version that stored an array of vm_page_t pointers). It also stores additional fields needed for in-kernel TLS such as the TLS header and trailer data that are currently unused. To more easily detect these mbufs, the M_NOMAP flag is set in m_flags in addition to M_EXT. Various functions like m_copydata() have been updated to safely access packet contents (using uiomove_fromphys()), to make things like BPF safe. NIC drivers advertise support for unmapped mbufs on transmit via a new IFCAP_NOMAP capability. This capability can be toggled via the new 'nomap' and '-nomap' ifconfig(8) commands. For NIC drivers that only transmit packet contents via DMA and use bus_dma, adding the capability to if_capabilities and if_capenable should be all that is required. If a NIC does not support unmapped mbufs, they are converted to a chain of mapped mbufs (using sf_bufs to provide the mapping) in ip_output or ip6_output. If an unmapped mbuf requires software checksums, it is also converted to a chain of mapped mbufs before computing the checksum. Submitted by: gallatin (earlier version) Reviewed by: gallatin, hselasky, rrs Discussed with: ae, kp (firewalls) Relnotes: yes Sponsored by: Netflix Differential Revision: https://reviews.freebsd.org/D20616
2019-06-29 00:48:33 +00:00
/* Turn 'm' into a "normal" mbuf. */
Step 4.1: mechanically rename M_NOMAP to M_EXTPG Reviewed by: gallatin Differential Revision: https://reviews.freebsd.org/D24598
2020-05-03 00:21:11 +00:00
m->m_flags &= ~(M_EXT | M_RDONLY | M_EXTPG);
Add an external mbuf buffer type that holds multiple unmapped pages. Unmapped mbufs allow sendfile to carry multiple pages of data in a single mbuf, without mapping those pages. It is a requirement for Netflix's in-kernel TLS, and provides a 5-10% CPU savings on heavy web serving workloads when used by sendfile, due to effectively compressing socket buffers by an order of magnitude, and hence reducing cache misses. For this new external mbuf buffer type (EXT_PGS), the ext_buf pointer now points to a struct mbuf_ext_pgs structure instead of a data buffer. This structure contains an array of physical addresses (this reduces cache misses compared to an earlier version that stored an array of vm_page_t pointers). It also stores additional fields needed for in-kernel TLS such as the TLS header and trailer data that are currently unused. To more easily detect these mbufs, the M_NOMAP flag is set in m_flags in addition to M_EXT. Various functions like m_copydata() have been updated to safely access packet contents (using uiomove_fromphys()), to make things like BPF safe. NIC drivers advertise support for unmapped mbufs on transmit via a new IFCAP_NOMAP capability. This capability can be toggled via the new 'nomap' and '-nomap' ifconfig(8) commands. For NIC drivers that only transmit packet contents via DMA and use bus_dma, adding the capability to if_capabilities and if_capenable should be all that is required. If a NIC does not support unmapped mbufs, they are converted to a chain of mapped mbufs (using sf_bufs to provide the mapping) in ip_output or ip6_output. If an unmapped mbuf requires software checksums, it is also converted to a chain of mapped mbufs before computing the checksum. Submitted by: gallatin (earlier version) Reviewed by: gallatin, hselasky, rrs Discussed with: ae, kp (firewalls) Relnotes: yes Sponsored by: Netflix Differential Revision: https://reviews.freebsd.org/D20616
2019-06-29 00:48:33 +00:00
m->m_data = m->m_dat;
In mb_unmapped_compress() we don't need mbuf structure to keep data, but we need buffer of MLEN bytes. This isn't just a simplification, but important fixup, because previous commit shrinked sizeof(struct mbuf) down below MSIZE, and instantiating an mbuf on stack no longer provides enough data. Reviewed by: gallatin Differential Revision: https://reviews.freebsd.org/D24598
2020-05-02 22:44:23 +00:00
/* Copy data back into m. */
bcopy(buf, mtod(m, char *), m->m_len);
Add an external mbuf buffer type that holds multiple unmapped pages. Unmapped mbufs allow sendfile to carry multiple pages of data in a single mbuf, without mapping those pages. It is a requirement for Netflix's in-kernel TLS, and provides a 5-10% CPU savings on heavy web serving workloads when used by sendfile, due to effectively compressing socket buffers by an order of magnitude, and hence reducing cache misses. For this new external mbuf buffer type (EXT_PGS), the ext_buf pointer now points to a struct mbuf_ext_pgs structure instead of a data buffer. This structure contains an array of physical addresses (this reduces cache misses compared to an earlier version that stored an array of vm_page_t pointers). It also stores additional fields needed for in-kernel TLS such as the TLS header and trailer data that are currently unused. To more easily detect these mbufs, the M_NOMAP flag is set in m_flags in addition to M_EXT. Various functions like m_copydata() have been updated to safely access packet contents (using uiomove_fromphys()), to make things like BPF safe. NIC drivers advertise support for unmapped mbufs on transmit via a new IFCAP_NOMAP capability. This capability can be toggled via the new 'nomap' and '-nomap' ifconfig(8) commands. For NIC drivers that only transmit packet contents via DMA and use bus_dma, adding the capability to if_capabilities and if_capenable should be all that is required. If a NIC does not support unmapped mbufs, they are converted to a chain of mapped mbufs (using sf_bufs to provide the mapping) in ip_output or ip6_output. If an unmapped mbuf requires software checksums, it is also converted to a chain of mapped mbufs before computing the checksum. Submitted by: gallatin (earlier version) Reviewed by: gallatin, hselasky, rrs Discussed with: ae, kp (firewalls) Relnotes: yes Sponsored by: Netflix Differential Revision: https://reviews.freebsd.org/D20616
2019-06-29 00:48:33 +00:00
return (0);
}
/*
* These next few routines are used to permit downgrading an unmapped
* mbuf to a chain of mapped mbufs. This is used when an interface
* doesn't supported unmapped mbufs or if checksums need to be
* computed in software.
*
* Each unmapped mbuf is converted to a chain of mbufs. First, any
* TLS header data is stored in a regular mbuf. Second, each page of
* unmapped data is stored in an mbuf with an EXT_SFBUF external
* cluster. These mbufs use an sf_buf to provide a valid KVA for the
* associated physical page. They also hold a reference on the
Step 4.2: start divorce of M_EXT and M_EXTPG They have more differencies than similarities. For now there is lots of code that would check for M_EXT only and work correctly on M_EXTPG buffers, so still carry M_EXT bit together with M_EXTPG. However, prepare some code for explicit check for M_EXTPG. Reviewed by: gallatin Differential Revision: https://reviews.freebsd.org/D24598
2020-05-03 00:37:16 +00:00
* original M_EXTPG mbuf to ensure the physical page doesn't go away.
Add an external mbuf buffer type that holds multiple unmapped pages. Unmapped mbufs allow sendfile to carry multiple pages of data in a single mbuf, without mapping those pages. It is a requirement for Netflix's in-kernel TLS, and provides a 5-10% CPU savings on heavy web serving workloads when used by sendfile, due to effectively compressing socket buffers by an order of magnitude, and hence reducing cache misses. For this new external mbuf buffer type (EXT_PGS), the ext_buf pointer now points to a struct mbuf_ext_pgs structure instead of a data buffer. This structure contains an array of physical addresses (this reduces cache misses compared to an earlier version that stored an array of vm_page_t pointers). It also stores additional fields needed for in-kernel TLS such as the TLS header and trailer data that are currently unused. To more easily detect these mbufs, the M_NOMAP flag is set in m_flags in addition to M_EXT. Various functions like m_copydata() have been updated to safely access packet contents (using uiomove_fromphys()), to make things like BPF safe. NIC drivers advertise support for unmapped mbufs on transmit via a new IFCAP_NOMAP capability. This capability can be toggled via the new 'nomap' and '-nomap' ifconfig(8) commands. For NIC drivers that only transmit packet contents via DMA and use bus_dma, adding the capability to if_capabilities and if_capenable should be all that is required. If a NIC does not support unmapped mbufs, they are converted to a chain of mapped mbufs (using sf_bufs to provide the mapping) in ip_output or ip6_output. If an unmapped mbuf requires software checksums, it is also converted to a chain of mapped mbufs before computing the checksum. Submitted by: gallatin (earlier version) Reviewed by: gallatin, hselasky, rrs Discussed with: ae, kp (firewalls) Relnotes: yes Sponsored by: Netflix Differential Revision: https://reviews.freebsd.org/D20616
2019-06-29 00:48:33 +00:00
* Finally, any TLS trailer data is stored in a regular mbuf.
*
* mb_unmapped_free_mext() is the ext_free handler for the EXT_SFBUF
* mbufs. It frees the associated sf_buf and releases its reference
Step 4.2: start divorce of M_EXT and M_EXTPG They have more differencies than similarities. For now there is lots of code that would check for M_EXT only and work correctly on M_EXTPG buffers, so still carry M_EXT bit together with M_EXTPG. However, prepare some code for explicit check for M_EXTPG. Reviewed by: gallatin Differential Revision: https://reviews.freebsd.org/D24598
2020-05-03 00:37:16 +00:00
* on the original M_EXTPG mbuf.
Add an external mbuf buffer type that holds multiple unmapped pages. Unmapped mbufs allow sendfile to carry multiple pages of data in a single mbuf, without mapping those pages. It is a requirement for Netflix's in-kernel TLS, and provides a 5-10% CPU savings on heavy web serving workloads when used by sendfile, due to effectively compressing socket buffers by an order of magnitude, and hence reducing cache misses. For this new external mbuf buffer type (EXT_PGS), the ext_buf pointer now points to a struct mbuf_ext_pgs structure instead of a data buffer. This structure contains an array of physical addresses (this reduces cache misses compared to an earlier version that stored an array of vm_page_t pointers). It also stores additional fields needed for in-kernel TLS such as the TLS header and trailer data that are currently unused. To more easily detect these mbufs, the M_NOMAP flag is set in m_flags in addition to M_EXT. Various functions like m_copydata() have been updated to safely access packet contents (using uiomove_fromphys()), to make things like BPF safe. NIC drivers advertise support for unmapped mbufs on transmit via a new IFCAP_NOMAP capability. This capability can be toggled via the new 'nomap' and '-nomap' ifconfig(8) commands. For NIC drivers that only transmit packet contents via DMA and use bus_dma, adding the capability to if_capabilities and if_capenable should be all that is required. If a NIC does not support unmapped mbufs, they are converted to a chain of mapped mbufs (using sf_bufs to provide the mapping) in ip_output or ip6_output. If an unmapped mbuf requires software checksums, it is also converted to a chain of mapped mbufs before computing the checksum. Submitted by: gallatin (earlier version) Reviewed by: gallatin, hselasky, rrs Discussed with: ae, kp (firewalls) Relnotes: yes Sponsored by: Netflix Differential Revision: https://reviews.freebsd.org/D20616
2019-06-29 00:48:33 +00:00
*
* _mb_unmapped_to_ext() is a helper function that converts a single
* unmapped mbuf into a chain of mbufs.
*
* mb_unmapped_to_ext() is the public function that walks an mbuf
* chain converting any unmapped mbufs to mapped mbufs. It returns
* the new chain of unmapped mbufs on success. On failure it frees
* the original mbuf chain and returns NULL.
*/
static void
mb_unmapped_free_mext(struct mbuf *m)
{
struct sf_buf *sf;
struct mbuf *old_m;
sf = m->m_ext.ext_arg1;
sf_buf_free(sf);
Step 4.2: start divorce of M_EXT and M_EXTPG They have more differencies than similarities. For now there is lots of code that would check for M_EXT only and work correctly on M_EXTPG buffers, so still carry M_EXT bit together with M_EXTPG. However, prepare some code for explicit check for M_EXTPG. Reviewed by: gallatin Differential Revision: https://reviews.freebsd.org/D24598
2020-05-03 00:37:16 +00:00
/* Drop the reference on the backing M_EXTPG mbuf. */
Add an external mbuf buffer type that holds multiple unmapped pages. Unmapped mbufs allow sendfile to carry multiple pages of data in a single mbuf, without mapping those pages. It is a requirement for Netflix's in-kernel TLS, and provides a 5-10% CPU savings on heavy web serving workloads when used by sendfile, due to effectively compressing socket buffers by an order of magnitude, and hence reducing cache misses. For this new external mbuf buffer type (EXT_PGS), the ext_buf pointer now points to a struct mbuf_ext_pgs structure instead of a data buffer. This structure contains an array of physical addresses (this reduces cache misses compared to an earlier version that stored an array of vm_page_t pointers). It also stores additional fields needed for in-kernel TLS such as the TLS header and trailer data that are currently unused. To more easily detect these mbufs, the M_NOMAP flag is set in m_flags in addition to M_EXT. Various functions like m_copydata() have been updated to safely access packet contents (using uiomove_fromphys()), to make things like BPF safe. NIC drivers advertise support for unmapped mbufs on transmit via a new IFCAP_NOMAP capability. This capability can be toggled via the new 'nomap' and '-nomap' ifconfig(8) commands. For NIC drivers that only transmit packet contents via DMA and use bus_dma, adding the capability to if_capabilities and if_capenable should be all that is required. If a NIC does not support unmapped mbufs, they are converted to a chain of mapped mbufs (using sf_bufs to provide the mapping) in ip_output or ip6_output. If an unmapped mbuf requires software checksums, it is also converted to a chain of mapped mbufs before computing the checksum. Submitted by: gallatin (earlier version) Reviewed by: gallatin, hselasky, rrs Discussed with: ae, kp (firewalls) Relnotes: yes Sponsored by: Netflix Differential Revision: https://reviews.freebsd.org/D20616
2019-06-29 00:48:33 +00:00
old_m = m->m_ext.ext_arg2;
Step 4.2: start divorce of M_EXT and M_EXTPG They have more differencies than similarities. For now there is lots of code that would check for M_EXT only and work correctly on M_EXTPG buffers, so still carry M_EXT bit together with M_EXTPG. However, prepare some code for explicit check for M_EXTPG. Reviewed by: gallatin Differential Revision: https://reviews.freebsd.org/D24598
2020-05-03 00:37:16 +00:00
mb_free_extpg(old_m);
Add an external mbuf buffer type that holds multiple unmapped pages. Unmapped mbufs allow sendfile to carry multiple pages of data in a single mbuf, without mapping those pages. It is a requirement for Netflix's in-kernel TLS, and provides a 5-10% CPU savings on heavy web serving workloads when used by sendfile, due to effectively compressing socket buffers by an order of magnitude, and hence reducing cache misses. For this new external mbuf buffer type (EXT_PGS), the ext_buf pointer now points to a struct mbuf_ext_pgs structure instead of a data buffer. This structure contains an array of physical addresses (this reduces cache misses compared to an earlier version that stored an array of vm_page_t pointers). It also stores additional fields needed for in-kernel TLS such as the TLS header and trailer data that are currently unused. To more easily detect these mbufs, the M_NOMAP flag is set in m_flags in addition to M_EXT. Various functions like m_copydata() have been updated to safely access packet contents (using uiomove_fromphys()), to make things like BPF safe. NIC drivers advertise support for unmapped mbufs on transmit via a new IFCAP_NOMAP capability. This capability can be toggled via the new 'nomap' and '-nomap' ifconfig(8) commands. For NIC drivers that only transmit packet contents via DMA and use bus_dma, adding the capability to if_capabilities and if_capenable should be all that is required. If a NIC does not support unmapped mbufs, they are converted to a chain of mapped mbufs (using sf_bufs to provide the mapping) in ip_output or ip6_output. If an unmapped mbuf requires software checksums, it is also converted to a chain of mapped mbufs before computing the checksum. Submitted by: gallatin (earlier version) Reviewed by: gallatin, hselasky, rrs Discussed with: ae, kp (firewalls) Relnotes: yes Sponsored by: Netflix Differential Revision: https://reviews.freebsd.org/D20616
2019-06-29 00:48:33 +00:00
}
static struct mbuf *
_mb_unmapped_to_ext(struct mbuf *m)
{
struct mbuf *m_new, *top, *prev, *mref;
struct sf_buf *sf;
vm_page_t pg;
int i, len, off, pglen, pgoff, seglen, segoff;
volatile u_int *refcnt;
u_int ref_inc = 0;
Mechanically rename MBUF_EXT_PGS_ASSERT() to M_ASSERTEXTPG() to match classical M_ASSERTPKTHDR. Reviewed by: gallatin Differential Revision: https://reviews.freebsd.org/D24598
2020-05-03 00:27:41 +00:00
M_ASSERTEXTPG(m);
Add an external mbuf buffer type that holds multiple unmapped pages. Unmapped mbufs allow sendfile to carry multiple pages of data in a single mbuf, without mapping those pages. It is a requirement for Netflix's in-kernel TLS, and provides a 5-10% CPU savings on heavy web serving workloads when used by sendfile, due to effectively compressing socket buffers by an order of magnitude, and hence reducing cache misses. For this new external mbuf buffer type (EXT_PGS), the ext_buf pointer now points to a struct mbuf_ext_pgs structure instead of a data buffer. This structure contains an array of physical addresses (this reduces cache misses compared to an earlier version that stored an array of vm_page_t pointers). It also stores additional fields needed for in-kernel TLS such as the TLS header and trailer data that are currently unused. To more easily detect these mbufs, the M_NOMAP flag is set in m_flags in addition to M_EXT. Various functions like m_copydata() have been updated to safely access packet contents (using uiomove_fromphys()), to make things like BPF safe. NIC drivers advertise support for unmapped mbufs on transmit via a new IFCAP_NOMAP capability. This capability can be toggled via the new 'nomap' and '-nomap' ifconfig(8) commands. For NIC drivers that only transmit packet contents via DMA and use bus_dma, adding the capability to if_capabilities and if_capenable should be all that is required. If a NIC does not support unmapped mbufs, they are converted to a chain of mapped mbufs (using sf_bufs to provide the mapping) in ip_output or ip6_output. If an unmapped mbuf requires software checksums, it is also converted to a chain of mapped mbufs before computing the checksum. Submitted by: gallatin (earlier version) Reviewed by: gallatin, hselasky, rrs Discussed with: ae, kp (firewalls) Relnotes: yes Sponsored by: Netflix Differential Revision: https://reviews.freebsd.org/D20616
2019-06-29 00:48:33 +00:00
len = m->m_len;
Step 3: anonymize struct mbuf_ext_pgs and move all its fields into mbuf within m_epg namespace. All edits except the 'struct mbuf' declaration and mb_dupcl() were done mechanically with sed: s/->m_ext_pgs.nrdy/->m_epg_nrdy/g s/->m_ext_pgs.hdr_len/->m_epg_hdrlen/g s/->m_ext_pgs.trail_len/->m_epg_trllen/g s/->m_ext_pgs.first_pg_off/->m_epg_1st_off/g s/->m_ext_pgs.last_pg_len/->m_epg_last_len/g s/->m_ext_pgs.flags/->m_epg_flags/g s/->m_ext_pgs.record_type/->m_epg_record_type/g s/->m_ext_pgs.enc_cnt/->m_epg_enc_cnt/g s/->m_ext_pgs.tls/->m_epg_tls/g s/->m_ext_pgs.so/->m_epg_so/g s/->m_ext_pgs.seqno/->m_epg_seqno/g s/->m_ext_pgs.stailq/->m_epg_stailq/g Reviewed by: gallatin Differential Revision: https://reviews.freebsd.org/D24598
2020-05-03 00:12:56 +00:00
KASSERT(m->m_epg_tls == NULL, ("%s: can't convert TLS mbuf %p",
Add an external mbuf buffer type that holds multiple unmapped pages. Unmapped mbufs allow sendfile to carry multiple pages of data in a single mbuf, without mapping those pages. It is a requirement for Netflix's in-kernel TLS, and provides a 5-10% CPU savings on heavy web serving workloads when used by sendfile, due to effectively compressing socket buffers by an order of magnitude, and hence reducing cache misses. For this new external mbuf buffer type (EXT_PGS), the ext_buf pointer now points to a struct mbuf_ext_pgs structure instead of a data buffer. This structure contains an array of physical addresses (this reduces cache misses compared to an earlier version that stored an array of vm_page_t pointers). It also stores additional fields needed for in-kernel TLS such as the TLS header and trailer data that are currently unused. To more easily detect these mbufs, the M_NOMAP flag is set in m_flags in addition to M_EXT. Various functions like m_copydata() have been updated to safely access packet contents (using uiomove_fromphys()), to make things like BPF safe. NIC drivers advertise support for unmapped mbufs on transmit via a new IFCAP_NOMAP capability. This capability can be toggled via the new 'nomap' and '-nomap' ifconfig(8) commands. For NIC drivers that only transmit packet contents via DMA and use bus_dma, adding the capability to if_capabilities and if_capenable should be all that is required. If a NIC does not support unmapped mbufs, they are converted to a chain of mapped mbufs (using sf_bufs to provide the mapping) in ip_output or ip6_output. If an unmapped mbuf requires software checksums, it is also converted to a chain of mapped mbufs before computing the checksum. Submitted by: gallatin (earlier version) Reviewed by: gallatin, hselasky, rrs Discussed with: ae, kp (firewalls) Relnotes: yes Sponsored by: Netflix Differential Revision: https://reviews.freebsd.org/D20616
2019-06-29 00:48:33 +00:00
__func__, m));
/* See if this is the mbuf that holds the embedded refcount. */
if (m->m_ext.ext_flags & EXT_FLAG_EMBREF) {
refcnt = &m->m_ext.ext_count;
mref = m;
} else {
KASSERT(m->m_ext.ext_cnt != NULL,
("%s: no refcounting pointer on %p", __func__, m));
refcnt = m->m_ext.ext_cnt;
mref = __containerof(refcnt, struct mbuf, m_ext.ext_count);
}
/* Skip over any data removed from the front. */
off = mtod(m, vm_offset_t);
top = NULL;
Step 3: anonymize struct mbuf_ext_pgs and move all its fields into mbuf within m_epg namespace. All edits except the 'struct mbuf' declaration and mb_dupcl() were done mechanically with sed: s/->m_ext_pgs.nrdy/->m_epg_nrdy/g s/->m_ext_pgs.hdr_len/->m_epg_hdrlen/g s/->m_ext_pgs.trail_len/->m_epg_trllen/g s/->m_ext_pgs.first_pg_off/->m_epg_1st_off/g s/->m_ext_pgs.last_pg_len/->m_epg_last_len/g s/->m_ext_pgs.flags/->m_epg_flags/g s/->m_ext_pgs.record_type/->m_epg_record_type/g s/->m_ext_pgs.enc_cnt/->m_epg_enc_cnt/g s/->m_ext_pgs.tls/->m_epg_tls/g s/->m_ext_pgs.so/->m_epg_so/g s/->m_ext_pgs.seqno/->m_epg_seqno/g s/->m_ext_pgs.stailq/->m_epg_stailq/g Reviewed by: gallatin Differential Revision: https://reviews.freebsd.org/D24598
2020-05-03 00:12:56 +00:00
if (m->m_epg_hdrlen != 0) {
if (off >= m->m_epg_hdrlen) {
off -= m->m_epg_hdrlen;
Add an external mbuf buffer type that holds multiple unmapped pages. Unmapped mbufs allow sendfile to carry multiple pages of data in a single mbuf, without mapping those pages. It is a requirement for Netflix's in-kernel TLS, and provides a 5-10% CPU savings on heavy web serving workloads when used by sendfile, due to effectively compressing socket buffers by an order of magnitude, and hence reducing cache misses. For this new external mbuf buffer type (EXT_PGS), the ext_buf pointer now points to a struct mbuf_ext_pgs structure instead of a data buffer. This structure contains an array of physical addresses (this reduces cache misses compared to an earlier version that stored an array of vm_page_t pointers). It also stores additional fields needed for in-kernel TLS such as the TLS header and trailer data that are currently unused. To more easily detect these mbufs, the M_NOMAP flag is set in m_flags in addition to M_EXT. Various functions like m_copydata() have been updated to safely access packet contents (using uiomove_fromphys()), to make things like BPF safe. NIC drivers advertise support for unmapped mbufs on transmit via a new IFCAP_NOMAP capability. This capability can be toggled via the new 'nomap' and '-nomap' ifconfig(8) commands. For NIC drivers that only transmit packet contents via DMA and use bus_dma, adding the capability to if_capabilities and if_capenable should be all that is required. If a NIC does not support unmapped mbufs, they are converted to a chain of mapped mbufs (using sf_bufs to provide the mapping) in ip_output or ip6_output. If an unmapped mbuf requires software checksums, it is also converted to a chain of mapped mbufs before computing the checksum. Submitted by: gallatin (earlier version) Reviewed by: gallatin, hselasky, rrs Discussed with: ae, kp (firewalls) Relnotes: yes Sponsored by: Netflix Differential Revision: https://reviews.freebsd.org/D20616
2019-06-29 00:48:33 +00:00
} else {
Step 3: anonymize struct mbuf_ext_pgs and move all its fields into mbuf within m_epg namespace. All edits except the 'struct mbuf' declaration and mb_dupcl() were done mechanically with sed: s/->m_ext_pgs.nrdy/->m_epg_nrdy/g s/->m_ext_pgs.hdr_len/->m_epg_hdrlen/g s/->m_ext_pgs.trail_len/->m_epg_trllen/g s/->m_ext_pgs.first_pg_off/->m_epg_1st_off/g s/->m_ext_pgs.last_pg_len/->m_epg_last_len/g s/->m_ext_pgs.flags/->m_epg_flags/g s/->m_ext_pgs.record_type/->m_epg_record_type/g s/->m_ext_pgs.enc_cnt/->m_epg_enc_cnt/g s/->m_ext_pgs.tls/->m_epg_tls/g s/->m_ext_pgs.so/->m_epg_so/g s/->m_ext_pgs.seqno/->m_epg_seqno/g s/->m_ext_pgs.stailq/->m_epg_stailq/g Reviewed by: gallatin Differential Revision: https://reviews.freebsd.org/D24598
2020-05-03 00:12:56 +00:00
seglen = m->m_epg_hdrlen - off;
Add an external mbuf buffer type that holds multiple unmapped pages. Unmapped mbufs allow sendfile to carry multiple pages of data in a single mbuf, without mapping those pages. It is a requirement for Netflix's in-kernel TLS, and provides a 5-10% CPU savings on heavy web serving workloads when used by sendfile, due to effectively compressing socket buffers by an order of magnitude, and hence reducing cache misses. For this new external mbuf buffer type (EXT_PGS), the ext_buf pointer now points to a struct mbuf_ext_pgs structure instead of a data buffer. This structure contains an array of physical addresses (this reduces cache misses compared to an earlier version that stored an array of vm_page_t pointers). It also stores additional fields needed for in-kernel TLS such as the TLS header and trailer data that are currently unused. To more easily detect these mbufs, the M_NOMAP flag is set in m_flags in addition to M_EXT. Various functions like m_copydata() have been updated to safely access packet contents (using uiomove_fromphys()), to make things like BPF safe. NIC drivers advertise support for unmapped mbufs on transmit via a new IFCAP_NOMAP capability. This capability can be toggled via the new 'nomap' and '-nomap' ifconfig(8) commands. For NIC drivers that only transmit packet contents via DMA and use bus_dma, adding the capability to if_capabilities and if_capenable should be all that is required. If a NIC does not support unmapped mbufs, they are converted to a chain of mapped mbufs (using sf_bufs to provide the mapping) in ip_output or ip6_output. If an unmapped mbuf requires software checksums, it is also converted to a chain of mapped mbufs before computing the checksum. Submitted by: gallatin (earlier version) Reviewed by: gallatin, hselasky, rrs Discussed with: ae, kp (firewalls) Relnotes: yes Sponsored by: Netflix Differential Revision: https://reviews.freebsd.org/D20616
2019-06-29 00:48:33 +00:00
segoff = off;
seglen = min(seglen, len);
off = 0;
len -= seglen;
m_new = m_get(M_NOWAIT, MT_DATA);
if (m_new == NULL)
goto fail;
m_new->m_len = seglen;
prev = top = m_new;
Continuation of multi page mbuf redesign from r359919. The following series of patches addresses three things: Now that array of pages is embedded into mbuf, we no longer need separate structure to pass around, so struct mbuf_ext_pgs is an artifact of the first implementation. And struct mbuf_ext_pgs_data is a crutch to accomodate the main idea r359919 with minimal churn. Also, M_EXT of type EXT_PGS are just a synonym of M_NOMAP. The namespace for the newfeature is somewhat inconsistent and sometimes has a lengthy prefixes. In these patches we will gradually bring the namespace to "m_epg" prefix for all mbuf fields and most functions. Step 1 of 4: o Anonymize mbuf_ext_pgs_data, embed in m_ext o Embed mbuf_ext_pgs o Start documenting all this entanglement Reviewed by: gallatin Differential Revision: https://reviews.freebsd.org/D24598
2020-05-02 22:39:26 +00:00
memcpy(mtod(m_new, void *), &m->m_epg_hdr[segoff],
Add an external mbuf buffer type that holds multiple unmapped pages. Unmapped mbufs allow sendfile to carry multiple pages of data in a single mbuf, without mapping those pages. It is a requirement for Netflix's in-kernel TLS, and provides a 5-10% CPU savings on heavy web serving workloads when used by sendfile, due to effectively compressing socket buffers by an order of magnitude, and hence reducing cache misses. For this new external mbuf buffer type (EXT_PGS), the ext_buf pointer now points to a struct mbuf_ext_pgs structure instead of a data buffer. This structure contains an array of physical addresses (this reduces cache misses compared to an earlier version that stored an array of vm_page_t pointers). It also stores additional fields needed for in-kernel TLS such as the TLS header and trailer data that are currently unused. To more easily detect these mbufs, the M_NOMAP flag is set in m_flags in addition to M_EXT. Various functions like m_copydata() have been updated to safely access packet contents (using uiomove_fromphys()), to make things like BPF safe. NIC drivers advertise support for unmapped mbufs on transmit via a new IFCAP_NOMAP capability. This capability can be toggled via the new 'nomap' and '-nomap' ifconfig(8) commands. For NIC drivers that only transmit packet contents via DMA and use bus_dma, adding the capability to if_capabilities and if_capenable should be all that is required. If a NIC does not support unmapped mbufs, they are converted to a chain of mapped mbufs (using sf_bufs to provide the mapping) in ip_output or ip6_output. If an unmapped mbuf requires software checksums, it is also converted to a chain of mapped mbufs before computing the checksum. Submitted by: gallatin (earlier version) Reviewed by: gallatin, hselasky, rrs Discussed with: ae, kp (firewalls) Relnotes: yes Sponsored by: Netflix Differential Revision: https://reviews.freebsd.org/D20616
2019-06-29 00:48:33 +00:00
seglen);
}
}
Step 3: anonymize struct mbuf_ext_pgs and move all its fields into mbuf within m_epg namespace. All edits except the 'struct mbuf' declaration and mb_dupcl() were done mechanically with sed: s/->m_ext_pgs.nrdy/->m_epg_nrdy/g s/->m_ext_pgs.hdr_len/->m_epg_hdrlen/g s/->m_ext_pgs.trail_len/->m_epg_trllen/g s/->m_ext_pgs.first_pg_off/->m_epg_1st_off/g s/->m_ext_pgs.last_pg_len/->m_epg_last_len/g s/->m_ext_pgs.flags/->m_epg_flags/g s/->m_ext_pgs.record_type/->m_epg_record_type/g s/->m_ext_pgs.enc_cnt/->m_epg_enc_cnt/g s/->m_ext_pgs.tls/->m_epg_tls/g s/->m_ext_pgs.so/->m_epg_so/g s/->m_ext_pgs.seqno/->m_epg_seqno/g s/->m_ext_pgs.stailq/->m_epg_stailq/g Reviewed by: gallatin Differential Revision: https://reviews.freebsd.org/D24598
2020-05-03 00:12:56 +00:00
pgoff = m->m_epg_1st_off;
for (i = 0; i < m->m_epg_npgs && len > 0; i++) {
Step 2.3: Rename mbuf_ext_pg_len() to m_epg_pagelen() that uses mbuf argument. Reviewed by: gallatin Differential Revision: https://reviews.freebsd.org/D24598
2020-05-02 23:52:35 +00:00
pglen = m_epg_pagelen(m, i, pgoff);
Add an external mbuf buffer type that holds multiple unmapped pages. Unmapped mbufs allow sendfile to carry multiple pages of data in a single mbuf, without mapping those pages. It is a requirement for Netflix's in-kernel TLS, and provides a 5-10% CPU savings on heavy web serving workloads when used by sendfile, due to effectively compressing socket buffers by an order of magnitude, and hence reducing cache misses. For this new external mbuf buffer type (EXT_PGS), the ext_buf pointer now points to a struct mbuf_ext_pgs structure instead of a data buffer. This structure contains an array of physical addresses (this reduces cache misses compared to an earlier version that stored an array of vm_page_t pointers). It also stores additional fields needed for in-kernel TLS such as the TLS header and trailer data that are currently unused. To more easily detect these mbufs, the M_NOMAP flag is set in m_flags in addition to M_EXT. Various functions like m_copydata() have been updated to safely access packet contents (using uiomove_fromphys()), to make things like BPF safe. NIC drivers advertise support for unmapped mbufs on transmit via a new IFCAP_NOMAP capability. This capability can be toggled via the new 'nomap' and '-nomap' ifconfig(8) commands. For NIC drivers that only transmit packet contents via DMA and use bus_dma, adding the capability to if_capabilities and if_capenable should be all that is required. If a NIC does not support unmapped mbufs, they are converted to a chain of mapped mbufs (using sf_bufs to provide the mapping) in ip_output or ip6_output. If an unmapped mbuf requires software checksums, it is also converted to a chain of mapped mbufs before computing the checksum. Submitted by: gallatin (earlier version) Reviewed by: gallatin, hselasky, rrs Discussed with: ae, kp (firewalls) Relnotes: yes Sponsored by: Netflix Differential Revision: https://reviews.freebsd.org/D20616
2019-06-29 00:48:33 +00:00
if (off >= pglen) {
off -= pglen;
pgoff = 0;
continue;
}
seglen = pglen - off;
segoff = pgoff + off;
off = 0;
seglen = min(seglen, len);
len -= seglen;
Continuation of multi page mbuf redesign from r359919. The following series of patches addresses three things: Now that array of pages is embedded into mbuf, we no longer need separate structure to pass around, so struct mbuf_ext_pgs is an artifact of the first implementation. And struct mbuf_ext_pgs_data is a crutch to accomodate the main idea r359919 with minimal churn. Also, M_EXT of type EXT_PGS are just a synonym of M_NOMAP. The namespace for the newfeature is somewhat inconsistent and sometimes has a lengthy prefixes. In these patches we will gradually bring the namespace to "m_epg" prefix for all mbuf fields and most functions. Step 1 of 4: o Anonymize mbuf_ext_pgs_data, embed in m_ext o Embed mbuf_ext_pgs o Start documenting all this entanglement Reviewed by: gallatin Differential Revision: https://reviews.freebsd.org/D24598
2020-05-02 22:39:26 +00:00
pg = PHYS_TO_VM_PAGE(m->m_epg_pa[i]);
Add an external mbuf buffer type that holds multiple unmapped pages. Unmapped mbufs allow sendfile to carry multiple pages of data in a single mbuf, without mapping those pages. It is a requirement for Netflix's in-kernel TLS, and provides a 5-10% CPU savings on heavy web serving workloads when used by sendfile, due to effectively compressing socket buffers by an order of magnitude, and hence reducing cache misses. For this new external mbuf buffer type (EXT_PGS), the ext_buf pointer now points to a struct mbuf_ext_pgs structure instead of a data buffer. This structure contains an array of physical addresses (this reduces cache misses compared to an earlier version that stored an array of vm_page_t pointers). It also stores additional fields needed for in-kernel TLS such as the TLS header and trailer data that are currently unused. To more easily detect these mbufs, the M_NOMAP flag is set in m_flags in addition to M_EXT. Various functions like m_copydata() have been updated to safely access packet contents (using uiomove_fromphys()), to make things like BPF safe. NIC drivers advertise support for unmapped mbufs on transmit via a new IFCAP_NOMAP capability. This capability can be toggled via the new 'nomap' and '-nomap' ifconfig(8) commands. For NIC drivers that only transmit packet contents via DMA and use bus_dma, adding the capability to if_capabilities and if_capenable should be all that is required. If a NIC does not support unmapped mbufs, they are converted to a chain of mapped mbufs (using sf_bufs to provide the mapping) in ip_output or ip6_output. If an unmapped mbuf requires software checksums, it is also converted to a chain of mapped mbufs before computing the checksum. Submitted by: gallatin (earlier version) Reviewed by: gallatin, hselasky, rrs Discussed with: ae, kp (firewalls) Relnotes: yes Sponsored by: Netflix Differential Revision: https://reviews.freebsd.org/D20616
2019-06-29 00:48:33 +00:00
m_new = m_get(M_NOWAIT, MT_DATA);
if (m_new == NULL)
goto fail;
if (top == NULL) {
top = prev = m_new;
} else {
prev->m_next = m_new;
prev = m_new;
}
sf = sf_buf_alloc(pg, SFB_NOWAIT);
if (sf == NULL)
goto fail;
ref_inc++;
m_extadd(m_new, (char *)sf_buf_kva(sf), PAGE_SIZE,
mb_unmapped_free_mext, sf, mref, M_RDONLY, EXT_SFBUF);
m_new->m_data += segoff;
m_new->m_len = seglen;
pgoff = 0;
};
if (len != 0) {
Step 3: anonymize struct mbuf_ext_pgs and move all its fields into mbuf within m_epg namespace. All edits except the 'struct mbuf' declaration and mb_dupcl() were done mechanically with sed: s/->m_ext_pgs.nrdy/->m_epg_nrdy/g s/->m_ext_pgs.hdr_len/->m_epg_hdrlen/g s/->m_ext_pgs.trail_len/->m_epg_trllen/g s/->m_ext_pgs.first_pg_off/->m_epg_1st_off/g s/->m_ext_pgs.last_pg_len/->m_epg_last_len/g s/->m_ext_pgs.flags/->m_epg_flags/g s/->m_ext_pgs.record_type/->m_epg_record_type/g s/->m_ext_pgs.enc_cnt/->m_epg_enc_cnt/g s/->m_ext_pgs.tls/->m_epg_tls/g s/->m_ext_pgs.so/->m_epg_so/g s/->m_ext_pgs.seqno/->m_epg_seqno/g s/->m_ext_pgs.stailq/->m_epg_stailq/g Reviewed by: gallatin Differential Revision: https://reviews.freebsd.org/D24598
2020-05-03 00:12:56 +00:00
KASSERT((off + len) <= m->m_epg_trllen,
Add an external mbuf buffer type that holds multiple unmapped pages. Unmapped mbufs allow sendfile to carry multiple pages of data in a single mbuf, without mapping those pages. It is a requirement for Netflix's in-kernel TLS, and provides a 5-10% CPU savings on heavy web serving workloads when used by sendfile, due to effectively compressing socket buffers by an order of magnitude, and hence reducing cache misses. For this new external mbuf buffer type (EXT_PGS), the ext_buf pointer now points to a struct mbuf_ext_pgs structure instead of a data buffer. This structure contains an array of physical addresses (this reduces cache misses compared to an earlier version that stored an array of vm_page_t pointers). It also stores additional fields needed for in-kernel TLS such as the TLS header and trailer data that are currently unused. To more easily detect these mbufs, the M_NOMAP flag is set in m_flags in addition to M_EXT. Various functions like m_copydata() have been updated to safely access packet contents (using uiomove_fromphys()), to make things like BPF safe. NIC drivers advertise support for unmapped mbufs on transmit via a new IFCAP_NOMAP capability. This capability can be toggled via the new 'nomap' and '-nomap' ifconfig(8) commands. For NIC drivers that only transmit packet contents via DMA and use bus_dma, adding the capability to if_capabilities and if_capenable should be all that is required. If a NIC does not support unmapped mbufs, they are converted to a chain of mapped mbufs (using sf_bufs to provide the mapping) in ip_output or ip6_output. If an unmapped mbuf requires software checksums, it is also converted to a chain of mapped mbufs before computing the checksum. Submitted by: gallatin (earlier version) Reviewed by: gallatin, hselasky, rrs Discussed with: ae, kp (firewalls) Relnotes: yes Sponsored by: Netflix Differential Revision: https://reviews.freebsd.org/D20616
2019-06-29 00:48:33 +00:00
("off + len > trail (%d + %d > %d)", off, len,
Step 3: anonymize struct mbuf_ext_pgs and move all its fields into mbuf within m_epg namespace. All edits except the 'struct mbuf' declaration and mb_dupcl() were done mechanically with sed: s/->m_ext_pgs.nrdy/->m_epg_nrdy/g s/->m_ext_pgs.hdr_len/->m_epg_hdrlen/g s/->m_ext_pgs.trail_len/->m_epg_trllen/g s/->m_ext_pgs.first_pg_off/->m_epg_1st_off/g s/->m_ext_pgs.last_pg_len/->m_epg_last_len/g s/->m_ext_pgs.flags/->m_epg_flags/g s/->m_ext_pgs.record_type/->m_epg_record_type/g s/->m_ext_pgs.enc_cnt/->m_epg_enc_cnt/g s/->m_ext_pgs.tls/->m_epg_tls/g s/->m_ext_pgs.so/->m_epg_so/g s/->m_ext_pgs.seqno/->m_epg_seqno/g s/->m_ext_pgs.stailq/->m_epg_stailq/g Reviewed by: gallatin Differential Revision: https://reviews.freebsd.org/D24598
2020-05-03 00:12:56 +00:00
m->m_epg_trllen));
Add an external mbuf buffer type that holds multiple unmapped pages. Unmapped mbufs allow sendfile to carry multiple pages of data in a single mbuf, without mapping those pages. It is a requirement for Netflix's in-kernel TLS, and provides a 5-10% CPU savings on heavy web serving workloads when used by sendfile, due to effectively compressing socket buffers by an order of magnitude, and hence reducing cache misses. For this new external mbuf buffer type (EXT_PGS), the ext_buf pointer now points to a struct mbuf_ext_pgs structure instead of a data buffer. This structure contains an array of physical addresses (this reduces cache misses compared to an earlier version that stored an array of vm_page_t pointers). It also stores additional fields needed for in-kernel TLS such as the TLS header and trailer data that are currently unused. To more easily detect these mbufs, the M_NOMAP flag is set in m_flags in addition to M_EXT. Various functions like m_copydata() have been updated to safely access packet contents (using uiomove_fromphys()), to make things like BPF safe. NIC drivers advertise support for unmapped mbufs on transmit via a new IFCAP_NOMAP capability. This capability can be toggled via the new 'nomap' and '-nomap' ifconfig(8) commands. For NIC drivers that only transmit packet contents via DMA and use bus_dma, adding the capability to if_capabilities and if_capenable should be all that is required. If a NIC does not support unmapped mbufs, they are converted to a chain of mapped mbufs (using sf_bufs to provide the mapping) in ip_output or ip6_output. If an unmapped mbuf requires software checksums, it is also converted to a chain of mapped mbufs before computing the checksum. Submitted by: gallatin (earlier version) Reviewed by: gallatin, hselasky, rrs Discussed with: ae, kp (firewalls) Relnotes: yes Sponsored by: Netflix Differential Revision: https://reviews.freebsd.org/D20616
2019-06-29 00:48:33 +00:00
m_new = m_get(M_NOWAIT, MT_DATA);
if (m_new == NULL)
goto fail;
if (top == NULL)
top = m_new;
else
prev->m_next = m_new;
m_new->m_len = len;
Continuation of multi page mbuf redesign from r359919. The following series of patches addresses three things: Now that array of pages is embedded into mbuf, we no longer need separate structure to pass around, so struct mbuf_ext_pgs is an artifact of the first implementation. And struct mbuf_ext_pgs_data is a crutch to accomodate the main idea r359919 with minimal churn. Also, M_EXT of type EXT_PGS are just a synonym of M_NOMAP. The namespace for the newfeature is somewhat inconsistent and sometimes has a lengthy prefixes. In these patches we will gradually bring the namespace to "m_epg" prefix for all mbuf fields and most functions. Step 1 of 4: o Anonymize mbuf_ext_pgs_data, embed in m_ext o Embed mbuf_ext_pgs o Start documenting all this entanglement Reviewed by: gallatin Differential Revision: https://reviews.freebsd.org/D24598
2020-05-02 22:39:26 +00:00
memcpy(mtod(m_new, void *), &m->m_epg_trail[off], len);
Add an external mbuf buffer type that holds multiple unmapped pages. Unmapped mbufs allow sendfile to carry multiple pages of data in a single mbuf, without mapping those pages. It is a requirement for Netflix's in-kernel TLS, and provides a 5-10% CPU savings on heavy web serving workloads when used by sendfile, due to effectively compressing socket buffers by an order of magnitude, and hence reducing cache misses. For this new external mbuf buffer type (EXT_PGS), the ext_buf pointer now points to a struct mbuf_ext_pgs structure instead of a data buffer. This structure contains an array of physical addresses (this reduces cache misses compared to an earlier version that stored an array of vm_page_t pointers). It also stores additional fields needed for in-kernel TLS such as the TLS header and trailer data that are currently unused. To more easily detect these mbufs, the M_NOMAP flag is set in m_flags in addition to M_EXT. Various functions like m_copydata() have been updated to safely access packet contents (using uiomove_fromphys()), to make things like BPF safe. NIC drivers advertise support for unmapped mbufs on transmit via a new IFCAP_NOMAP capability. This capability can be toggled via the new 'nomap' and '-nomap' ifconfig(8) commands. For NIC drivers that only transmit packet contents via DMA and use bus_dma, adding the capability to if_capabilities and if_capenable should be all that is required. If a NIC does not support unmapped mbufs, they are converted to a chain of mapped mbufs (using sf_bufs to provide the mapping) in ip_output or ip6_output. If an unmapped mbuf requires software checksums, it is also converted to a chain of mapped mbufs before computing the checksum. Submitted by: gallatin (earlier version) Reviewed by: gallatin, hselasky, rrs Discussed with: ae, kp (firewalls) Relnotes: yes Sponsored by: Netflix Differential Revision: https://reviews.freebsd.org/D20616
2019-06-29 00:48:33 +00:00
}
if (ref_inc != 0) {
/*
* Obtain an additional reference on the old mbuf for
* each created EXT_SFBUF mbuf. They will be dropped
* in mb_unmapped_free_mext().
*/
if (*refcnt == 1)
*refcnt += ref_inc;
else
atomic_add_int(refcnt, ref_inc);
}
m_free(m);
return (top);
fail:
if (ref_inc != 0) {
/*
* Obtain an additional reference on the old mbuf for
* each created EXT_SFBUF mbuf. They will be
* immediately dropped when these mbufs are freed
* below.
*/
if (*refcnt == 1)
*refcnt += ref_inc;
else
atomic_add_int(refcnt, ref_inc);
}
m_free(m);
m_freem(top);
return (NULL);
}
struct mbuf *
mb_unmapped_to_ext(struct mbuf *top)
{
struct mbuf *m, *next, *prev = NULL;
prev = NULL;
for (m = top; m != NULL; m = next) {
/* m might be freed, so cache the next pointer. */
next = m->m_next;
Step 4.1: mechanically rename M_NOMAP to M_EXTPG Reviewed by: gallatin Differential Revision: https://reviews.freebsd.org/D24598
2020-05-03 00:21:11 +00:00
if (m->m_flags & M_EXTPG) {
Add an external mbuf buffer type that holds multiple unmapped pages. Unmapped mbufs allow sendfile to carry multiple pages of data in a single mbuf, without mapping those pages. It is a requirement for Netflix's in-kernel TLS, and provides a 5-10% CPU savings on heavy web serving workloads when used by sendfile, due to effectively compressing socket buffers by an order of magnitude, and hence reducing cache misses. For this new external mbuf buffer type (EXT_PGS), the ext_buf pointer now points to a struct mbuf_ext_pgs structure instead of a data buffer. This structure contains an array of physical addresses (this reduces cache misses compared to an earlier version that stored an array of vm_page_t pointers). It also stores additional fields needed for in-kernel TLS such as the TLS header and trailer data that are currently unused. To more easily detect these mbufs, the M_NOMAP flag is set in m_flags in addition to M_EXT. Various functions like m_copydata() have been updated to safely access packet contents (using uiomove_fromphys()), to make things like BPF safe. NIC drivers advertise support for unmapped mbufs on transmit via a new IFCAP_NOMAP capability. This capability can be toggled via the new 'nomap' and '-nomap' ifconfig(8) commands. For NIC drivers that only transmit packet contents via DMA and use bus_dma, adding the capability to if_capabilities and if_capenable should be all that is required. If a NIC does not support unmapped mbufs, they are converted to a chain of mapped mbufs (using sf_bufs to provide the mapping) in ip_output or ip6_output. If an unmapped mbuf requires software checksums, it is also converted to a chain of mapped mbufs before computing the checksum. Submitted by: gallatin (earlier version) Reviewed by: gallatin, hselasky, rrs Discussed with: ae, kp (firewalls) Relnotes: yes Sponsored by: Netflix Differential Revision: https://reviews.freebsd.org/D20616
2019-06-29 00:48:33 +00:00
if (prev != NULL) {
/*
* Remove 'm' from the new chain so
* that the 'top' chain terminates
* before 'm' in case 'top' is freed
* due to an error.
*/
prev->m_next = NULL;
}
m = _mb_unmapped_to_ext(m);
if (m == NULL) {
m_freem(top);
m_freem(next);
return (NULL);
}
if (prev == NULL) {
top = m;
} else {
prev->m_next = m;
}
/*
* Replaced one mbuf with a chain, so we must
* find the end of chain.
*/
prev = m_last(m);
} else {
if (prev != NULL) {
prev->m_next = m;
}
prev = m;
}
}
return (top);
}
/*
Step 4.2: start divorce of M_EXT and M_EXTPG They have more differencies than similarities. For now there is lots of code that would check for M_EXT only and work correctly on M_EXTPG buffers, so still carry M_EXT bit together with M_EXTPG. However, prepare some code for explicit check for M_EXTPG. Reviewed by: gallatin Differential Revision: https://reviews.freebsd.org/D24598
2020-05-03 00:37:16 +00:00
* Allocate an empty M_EXTPG mbuf. The ext_free routine is
Add an external mbuf buffer type that holds multiple unmapped pages. Unmapped mbufs allow sendfile to carry multiple pages of data in a single mbuf, without mapping those pages. It is a requirement for Netflix's in-kernel TLS, and provides a 5-10% CPU savings on heavy web serving workloads when used by sendfile, due to effectively compressing socket buffers by an order of magnitude, and hence reducing cache misses. For this new external mbuf buffer type (EXT_PGS), the ext_buf pointer now points to a struct mbuf_ext_pgs structure instead of a data buffer. This structure contains an array of physical addresses (this reduces cache misses compared to an earlier version that stored an array of vm_page_t pointers). It also stores additional fields needed for in-kernel TLS such as the TLS header and trailer data that are currently unused. To more easily detect these mbufs, the M_NOMAP flag is set in m_flags in addition to M_EXT. Various functions like m_copydata() have been updated to safely access packet contents (using uiomove_fromphys()), to make things like BPF safe. NIC drivers advertise support for unmapped mbufs on transmit via a new IFCAP_NOMAP capability. This capability can be toggled via the new 'nomap' and '-nomap' ifconfig(8) commands. For NIC drivers that only transmit packet contents via DMA and use bus_dma, adding the capability to if_capabilities and if_capenable should be all that is required. If a NIC does not support unmapped mbufs, they are converted to a chain of mapped mbufs (using sf_bufs to provide the mapping) in ip_output or ip6_output. If an unmapped mbuf requires software checksums, it is also converted to a chain of mapped mbufs before computing the checksum. Submitted by: gallatin (earlier version) Reviewed by: gallatin, hselasky, rrs Discussed with: ae, kp (firewalls) Relnotes: yes Sponsored by: Netflix Differential Revision: https://reviews.freebsd.org/D20616
2019-06-29 00:48:33 +00:00
* responsible for freeing any pages backing this mbuf when it is
* freed.
*/
struct mbuf *
KTLS: Re-work unmapped mbufs to carry ext_pgs in the mbuf itself. While the original implementation of unmapped mbufs was a large step forward in terms of reducing cache misses by enabling mbufs to carry more than a single page for sendfile, they are rather cache unfriendly when accessing the ext_pgs metadata and data. This is because the ext_pgs part of the mbuf is allocated separately, and almost guaranteed to be cold in cache. This change takes advantage of the fact that unmapped mbufs are never used at the same time as pkthdr mbufs. Given this fact, we can overlap the ext_pgs metadata with the mbuf pkthdr, and carry the ext_pgs meta directly in the mbuf itself. Similarly, we can carry the ext_pgs data (TLS hdr/trailer/array of pages) directly after the existing m_ext. In order to be able to carry 5 pages (which is the minimum required for a 16K TLS record which is not perfectly aligned) on LP64, I've had to steal ext_arg2. The only user of this in the xmit path is sendfile, and I've adjusted it to use arg1 when using unmapped mbufs. This change is almost entirely mechanical, except that we change mb_alloc_ext_pgs() to no longer allow allocating pkthdrs, the change to avoid ext_arg2 as mentioned above, and the removal of the ext_pgs zone, This change saves roughly 2% "raw" CPU (~59% -> 57%), or over 3% "scaled" CPU on a Netflix 100% software kTLS workload at 90+ Gb/s on Broadwell Xeons. In a follow-on commit, I plan to remove some hacks to avoid access ext_pgs fields of mbufs, since they will now be in cache. Many thanks to glebius for helping to make this better in the Netflix tree. Reviewed by: hselasky, jhb, rrs, glebius (early version) Sponsored by: Netflix Differential Revision: https://reviews.freebsd.org/D24213
2020-04-14 14:46:06 +00:00
mb_alloc_ext_pgs(int how, m_ext_free_t ext_free)
Add an external mbuf buffer type that holds multiple unmapped pages. Unmapped mbufs allow sendfile to carry multiple pages of data in a single mbuf, without mapping those pages. It is a requirement for Netflix's in-kernel TLS, and provides a 5-10% CPU savings on heavy web serving workloads when used by sendfile, due to effectively compressing socket buffers by an order of magnitude, and hence reducing cache misses. For this new external mbuf buffer type (EXT_PGS), the ext_buf pointer now points to a struct mbuf_ext_pgs structure instead of a data buffer. This structure contains an array of physical addresses (this reduces cache misses compared to an earlier version that stored an array of vm_page_t pointers). It also stores additional fields needed for in-kernel TLS such as the TLS header and trailer data that are currently unused. To more easily detect these mbufs, the M_NOMAP flag is set in m_flags in addition to M_EXT. Various functions like m_copydata() have been updated to safely access packet contents (using uiomove_fromphys()), to make things like BPF safe. NIC drivers advertise support for unmapped mbufs on transmit via a new IFCAP_NOMAP capability. This capability can be toggled via the new 'nomap' and '-nomap' ifconfig(8) commands. For NIC drivers that only transmit packet contents via DMA and use bus_dma, adding the capability to if_capabilities and if_capenable should be all that is required. If a NIC does not support unmapped mbufs, they are converted to a chain of mapped mbufs (using sf_bufs to provide the mapping) in ip_output or ip6_output. If an unmapped mbuf requires software checksums, it is also converted to a chain of mapped mbufs before computing the checksum. Submitted by: gallatin (earlier version) Reviewed by: gallatin, hselasky, rrs Discussed with: ae, kp (firewalls) Relnotes: yes Sponsored by: Netflix Differential Revision: https://reviews.freebsd.org/D20616
2019-06-29 00:48:33 +00:00
{
struct mbuf *m;
KTLS: Re-work unmapped mbufs to carry ext_pgs in the mbuf itself. While the original implementation of unmapped mbufs was a large step forward in terms of reducing cache misses by enabling mbufs to carry more than a single page for sendfile, they are rather cache unfriendly when accessing the ext_pgs metadata and data. This is because the ext_pgs part of the mbuf is allocated separately, and almost guaranteed to be cold in cache. This change takes advantage of the fact that unmapped mbufs are never used at the same time as pkthdr mbufs. Given this fact, we can overlap the ext_pgs metadata with the mbuf pkthdr, and carry the ext_pgs meta directly in the mbuf itself. Similarly, we can carry the ext_pgs data (TLS hdr/trailer/array of pages) directly after the existing m_ext. In order to be able to carry 5 pages (which is the minimum required for a 16K TLS record which is not perfectly aligned) on LP64, I've had to steal ext_arg2. The only user of this in the xmit path is sendfile, and I've adjusted it to use arg1 when using unmapped mbufs. This change is almost entirely mechanical, except that we change mb_alloc_ext_pgs() to no longer allow allocating pkthdrs, the change to avoid ext_arg2 as mentioned above, and the removal of the ext_pgs zone, This change saves roughly 2% "raw" CPU (~59% -> 57%), or over 3% "scaled" CPU on a Netflix 100% software kTLS workload at 90+ Gb/s on Broadwell Xeons. In a follow-on commit, I plan to remove some hacks to avoid access ext_pgs fields of mbufs, since they will now be in cache. Many thanks to glebius for helping to make this better in the Netflix tree. Reviewed by: hselasky, jhb, rrs, glebius (early version) Sponsored by: Netflix Differential Revision: https://reviews.freebsd.org/D24213
2020-04-14 14:46:06 +00:00
m = m_get(how, MT_DATA);
Add an external mbuf buffer type that holds multiple unmapped pages. Unmapped mbufs allow sendfile to carry multiple pages of data in a single mbuf, without mapping those pages. It is a requirement for Netflix's in-kernel TLS, and provides a 5-10% CPU savings on heavy web serving workloads when used by sendfile, due to effectively compressing socket buffers by an order of magnitude, and hence reducing cache misses. For this new external mbuf buffer type (EXT_PGS), the ext_buf pointer now points to a struct mbuf_ext_pgs structure instead of a data buffer. This structure contains an array of physical addresses (this reduces cache misses compared to an earlier version that stored an array of vm_page_t pointers). It also stores additional fields needed for in-kernel TLS such as the TLS header and trailer data that are currently unused. To more easily detect these mbufs, the M_NOMAP flag is set in m_flags in addition to M_EXT. Various functions like m_copydata() have been updated to safely access packet contents (using uiomove_fromphys()), to make things like BPF safe. NIC drivers advertise support for unmapped mbufs on transmit via a new IFCAP_NOMAP capability. This capability can be toggled via the new 'nomap' and '-nomap' ifconfig(8) commands. For NIC drivers that only transmit packet contents via DMA and use bus_dma, adding the capability to if_capabilities and if_capenable should be all that is required. If a NIC does not support unmapped mbufs, they are converted to a chain of mapped mbufs (using sf_bufs to provide the mapping) in ip_output or ip6_output. If an unmapped mbuf requires software checksums, it is also converted to a chain of mapped mbufs before computing the checksum. Submitted by: gallatin (earlier version) Reviewed by: gallatin, hselasky, rrs Discussed with: ae, kp (firewalls) Relnotes: yes Sponsored by: Netflix Differential Revision: https://reviews.freebsd.org/D20616
2019-06-29 00:48:33 +00:00
if (m == NULL)
return (NULL);
Step 3: anonymize struct mbuf_ext_pgs and move all its fields into mbuf within m_epg namespace. All edits except the 'struct mbuf' declaration and mb_dupcl() were done mechanically with sed: s/->m_ext_pgs.nrdy/->m_epg_nrdy/g s/->m_ext_pgs.hdr_len/->m_epg_hdrlen/g s/->m_ext_pgs.trail_len/->m_epg_trllen/g s/->m_ext_pgs.first_pg_off/->m_epg_1st_off/g s/->m_ext_pgs.last_pg_len/->m_epg_last_len/g s/->m_ext_pgs.flags/->m_epg_flags/g s/->m_ext_pgs.record_type/->m_epg_record_type/g s/->m_ext_pgs.enc_cnt/->m_epg_enc_cnt/g s/->m_ext_pgs.tls/->m_epg_tls/g s/->m_ext_pgs.so/->m_epg_so/g s/->m_ext_pgs.seqno/->m_epg_seqno/g s/->m_ext_pgs.stailq/->m_epg_stailq/g Reviewed by: gallatin Differential Revision: https://reviews.freebsd.org/D24598
2020-05-03 00:12:56 +00:00
m->m_epg_npgs = 0;
m->m_epg_nrdy = 0;
m->m_epg_1st_off = 0;
m->m_epg_last_len = 0;
m->m_epg_flags = 0;
m->m_epg_hdrlen = 0;
m->m_epg_trllen = 0;
m->m_epg_tls = NULL;
m->m_epg_so = NULL;
Add an external mbuf buffer type that holds multiple unmapped pages. Unmapped mbufs allow sendfile to carry multiple pages of data in a single mbuf, without mapping those pages. It is a requirement for Netflix's in-kernel TLS, and provides a 5-10% CPU savings on heavy web serving workloads when used by sendfile, due to effectively compressing socket buffers by an order of magnitude, and hence reducing cache misses. For this new external mbuf buffer type (EXT_PGS), the ext_buf pointer now points to a struct mbuf_ext_pgs structure instead of a data buffer. This structure contains an array of physical addresses (this reduces cache misses compared to an earlier version that stored an array of vm_page_t pointers). It also stores additional fields needed for in-kernel TLS such as the TLS header and trailer data that are currently unused. To more easily detect these mbufs, the M_NOMAP flag is set in m_flags in addition to M_EXT. Various functions like m_copydata() have been updated to safely access packet contents (using uiomove_fromphys()), to make things like BPF safe. NIC drivers advertise support for unmapped mbufs on transmit via a new IFCAP_NOMAP capability. This capability can be toggled via the new 'nomap' and '-nomap' ifconfig(8) commands. For NIC drivers that only transmit packet contents via DMA and use bus_dma, adding the capability to if_capabilities and if_capenable should be all that is required. If a NIC does not support unmapped mbufs, they are converted to a chain of mapped mbufs (using sf_bufs to provide the mapping) in ip_output or ip6_output. If an unmapped mbuf requires software checksums, it is also converted to a chain of mapped mbufs before computing the checksum. Submitted by: gallatin (earlier version) Reviewed by: gallatin, hselasky, rrs Discussed with: ae, kp (firewalls) Relnotes: yes Sponsored by: Netflix Differential Revision: https://reviews.freebsd.org/D20616
2019-06-29 00:48:33 +00:00
m->m_data = NULL;
Step 4.1: mechanically rename M_NOMAP to M_EXTPG Reviewed by: gallatin Differential Revision: https://reviews.freebsd.org/D24598
2020-05-03 00:21:11 +00:00
m->m_flags |= (M_EXT | M_RDONLY | M_EXTPG);
Add an external mbuf buffer type that holds multiple unmapped pages. Unmapped mbufs allow sendfile to carry multiple pages of data in a single mbuf, without mapping those pages. It is a requirement for Netflix's in-kernel TLS, and provides a 5-10% CPU savings on heavy web serving workloads when used by sendfile, due to effectively compressing socket buffers by an order of magnitude, and hence reducing cache misses. For this new external mbuf buffer type (EXT_PGS), the ext_buf pointer now points to a struct mbuf_ext_pgs structure instead of a data buffer. This structure contains an array of physical addresses (this reduces cache misses compared to an earlier version that stored an array of vm_page_t pointers). It also stores additional fields needed for in-kernel TLS such as the TLS header and trailer data that are currently unused. To more easily detect these mbufs, the M_NOMAP flag is set in m_flags in addition to M_EXT. Various functions like m_copydata() have been updated to safely access packet contents (using uiomove_fromphys()), to make things like BPF safe. NIC drivers advertise support for unmapped mbufs on transmit via a new IFCAP_NOMAP capability. This capability can be toggled via the new 'nomap' and '-nomap' ifconfig(8) commands. For NIC drivers that only transmit packet contents via DMA and use bus_dma, adding the capability to if_capabilities and if_capenable should be all that is required. If a NIC does not support unmapped mbufs, they are converted to a chain of mapped mbufs (using sf_bufs to provide the mapping) in ip_output or ip6_output. If an unmapped mbuf requires software checksums, it is also converted to a chain of mapped mbufs before computing the checksum. Submitted by: gallatin (earlier version) Reviewed by: gallatin, hselasky, rrs Discussed with: ae, kp (firewalls) Relnotes: yes Sponsored by: Netflix Differential Revision: https://reviews.freebsd.org/D20616
2019-06-29 00:48:33 +00:00
m->m_ext.ext_flags = EXT_FLAG_EMBREF;
m->m_ext.ext_count = 1;
m->m_ext.ext_size = 0;
m->m_ext.ext_free = ext_free;
return (m);
}
o Gather all mbuf(9) allocation functions into kern_mbuf.c, and all mbuf(9) manipulation functions into uipc_mbuf.c. This looks like the initial intent, but had diffused in the last decade. o Gather all declarations in mbuf.h in one place and sort them. o Uninline m_clget() and m_cljget(). There are no functional changes in this patch. The patch comes from a larger version, where all mbuf(9) allocation was uninlined, which allowed to make mbuf(9) UMA zones private to kern_mbuf.c. The performance impact of the total uninlining is still unclear, so we are holding on now with larger version. Together with: melifaro, olivier
2016-02-11 21:32:23 +00:00
/*
* Clean up after mbufs with M_EXT storage attached to them if the
* reference count hits 1.
*/
void
mb_free_ext(struct mbuf *m)
{
New way to manage reference counting of mbuf external storage. The m_ext.ext_cnt pointer becomes a union. It can now hold the refcount value itself. To tell that m_ext.ext_flags flag EXT_FLAG_EMBREF is used. The first mbuf to attach a cluster stores the refcount. The further mbufs to reference the cluster point at refcount in the first mbuf. The first mbuf is freed only when the last reference is freed. The benefit over refcounts stored in separate slabs is that now refcounts of different, unrelated mbufs do not share a cache line. For EXT_EXTREF mbufs the zone_ext_refcnt is no longer needed, and m_extadd() becomes void, making widely used M_EXTADD macro safe. For EXT_SFBUF mbufs the sf_ext_ref() is removed, which was an optimization exactly against the cache aliasing problem with regular refcounting. Discussed with: rrs, rwatson, gnn, hiren, sbruno, np Reviewed by: rrs Differential Revision: https://reviews.freebsd.org/D5396 Sponsored by: Netflix
2016-03-01 00:17:14 +00:00
volatile u_int *refcnt;
struct mbuf *mref;
o Gather all mbuf(9) allocation functions into kern_mbuf.c, and all mbuf(9) manipulation functions into uipc_mbuf.c. This looks like the initial intent, but had diffused in the last decade. o Gather all declarations in mbuf.h in one place and sort them. o Uninline m_clget() and m_cljget(). There are no functional changes in this patch. The patch comes from a larger version, where all mbuf(9) allocation was uninlined, which allowed to make mbuf(9) UMA zones private to kern_mbuf.c. The performance impact of the total uninlining is still unclear, so we are holding on now with larger version. Together with: melifaro, olivier
2016-02-11 21:32:23 +00:00
int freembuf;
KASSERT(m->m_flags & M_EXT, ("%s: M_EXT not set on %p", __func__, m));
New way to manage reference counting of mbuf external storage. The m_ext.ext_cnt pointer becomes a union. It can now hold the refcount value itself. To tell that m_ext.ext_flags flag EXT_FLAG_EMBREF is used. The first mbuf to attach a cluster stores the refcount. The further mbufs to reference the cluster point at refcount in the first mbuf. The first mbuf is freed only when the last reference is freed. The benefit over refcounts stored in separate slabs is that now refcounts of different, unrelated mbufs do not share a cache line. For EXT_EXTREF mbufs the zone_ext_refcnt is no longer needed, and m_extadd() becomes void, making widely used M_EXTADD macro safe. For EXT_SFBUF mbufs the sf_ext_ref() is removed, which was an optimization exactly against the cache aliasing problem with regular refcounting. Discussed with: rrs, rwatson, gnn, hiren, sbruno, np Reviewed by: rrs Differential Revision: https://reviews.freebsd.org/D5396 Sponsored by: Netflix
2016-03-01 00:17:14 +00:00
/* See if this is the mbuf that holds the embedded refcount. */
if (m->m_ext.ext_flags & EXT_FLAG_EMBREF) {
refcnt = &m->m_ext.ext_count;
mref = m;
} else {
KASSERT(m->m_ext.ext_cnt != NULL,
("%s: no refcounting pointer on %p", __func__, m));
refcnt = m->m_ext.ext_cnt;
mref = __containerof(refcnt, struct mbuf, m_ext.ext_count);
}
o Gather all mbuf(9) allocation functions into kern_mbuf.c, and all mbuf(9) manipulation functions into uipc_mbuf.c. This looks like the initial intent, but had diffused in the last decade. o Gather all declarations in mbuf.h in one place and sort them. o Uninline m_clget() and m_cljget(). There are no functional changes in this patch. The patch comes from a larger version, where all mbuf(9) allocation was uninlined, which allowed to make mbuf(9) UMA zones private to kern_mbuf.c. The performance impact of the total uninlining is still unclear, so we are holding on now with larger version. Together with: melifaro, olivier
2016-02-11 21:32:23 +00:00
/*
New way to manage reference counting of mbuf external storage. The m_ext.ext_cnt pointer becomes a union. It can now hold the refcount value itself. To tell that m_ext.ext_flags flag EXT_FLAG_EMBREF is used. The first mbuf to attach a cluster stores the refcount. The further mbufs to reference the cluster point at refcount in the first mbuf. The first mbuf is freed only when the last reference is freed. The benefit over refcounts stored in separate slabs is that now refcounts of different, unrelated mbufs do not share a cache line. For EXT_EXTREF mbufs the zone_ext_refcnt is no longer needed, and m_extadd() becomes void, making widely used M_EXTADD macro safe. For EXT_SFBUF mbufs the sf_ext_ref() is removed, which was an optimization exactly against the cache aliasing problem with regular refcounting. Discussed with: rrs, rwatson, gnn, hiren, sbruno, np Reviewed by: rrs Differential Revision: https://reviews.freebsd.org/D5396 Sponsored by: Netflix
2016-03-01 00:17:14 +00:00
* Check if the header is embedded in the cluster. It is
* important that we can't touch any of the mbuf fields
* after we have freed the external storage, since mbuf
Add a comment and KASSERT that a M_NOFREE mbuf has always EXT_EXTREF ext. Submitted by: kmacy
2016-05-17 23:15:16 +00:00
* could have been embedded in it. For now, the mbufs
* embedded into the cluster are always of type EXT_EXTREF,
* and for this type we won't free the mref.
o Gather all mbuf(9) allocation functions into kern_mbuf.c, and all mbuf(9) manipulation functions into uipc_mbuf.c. This looks like the initial intent, but had diffused in the last decade. o Gather all declarations in mbuf.h in one place and sort them. o Uninline m_clget() and m_cljget(). There are no functional changes in this patch. The patch comes from a larger version, where all mbuf(9) allocation was uninlined, which allowed to make mbuf(9) UMA zones private to kern_mbuf.c. The performance impact of the total uninlining is still unclear, so we are holding on now with larger version. Together with: melifaro, olivier
2016-02-11 21:32:23 +00:00
*/
Add a comment and KASSERT that a M_NOFREE mbuf has always EXT_EXTREF ext. Submitted by: kmacy
2016-05-17 23:15:16 +00:00
if (m->m_flags & M_NOFREE) {
freembuf = 0;
Add new m_ext type for data for M_NOFREE mbufs, which doesn't actually do anything except several assertions. This type is going to be used for temporary on stack mbufs, that point into data in receive ring of a NIC, that shall not be freed. Such mbuf can not be stored or reallocated, its life time is current context.
2019-01-31 22:37:28 +00:00
KASSERT(m->m_ext.ext_type == EXT_EXTREF ||
m->m_ext.ext_type == EXT_RXRING,
Add a comment and KASSERT that a M_NOFREE mbuf has always EXT_EXTREF ext. Submitted by: kmacy
2016-05-17 23:15:16 +00:00
("%s: no-free mbuf %p has wrong type", __func__, m));
} else
freembuf = 1;
o Gather all mbuf(9) allocation functions into kern_mbuf.c, and all mbuf(9) manipulation functions into uipc_mbuf.c. This looks like the initial intent, but had diffused in the last decade. o Gather all declarations in mbuf.h in one place and sort them. o Uninline m_clget() and m_cljget(). There are no functional changes in this patch. The patch comes from a larger version, where all mbuf(9) allocation was uninlined, which allowed to make mbuf(9) UMA zones private to kern_mbuf.c. The performance impact of the total uninlining is still unclear, so we are holding on now with larger version. Together with: melifaro, olivier
2016-02-11 21:32:23 +00:00
New way to manage reference counting of mbuf external storage. The m_ext.ext_cnt pointer becomes a union. It can now hold the refcount value itself. To tell that m_ext.ext_flags flag EXT_FLAG_EMBREF is used. The first mbuf to attach a cluster stores the refcount. The further mbufs to reference the cluster point at refcount in the first mbuf. The first mbuf is freed only when the last reference is freed. The benefit over refcounts stored in separate slabs is that now refcounts of different, unrelated mbufs do not share a cache line. For EXT_EXTREF mbufs the zone_ext_refcnt is no longer needed, and m_extadd() becomes void, making widely used M_EXTADD macro safe. For EXT_SFBUF mbufs the sf_ext_ref() is removed, which was an optimization exactly against the cache aliasing problem with regular refcounting. Discussed with: rrs, rwatson, gnn, hiren, sbruno, np Reviewed by: rrs Differential Revision: https://reviews.freebsd.org/D5396 Sponsored by: Netflix
2016-03-01 00:17:14 +00:00
/* Free attached storage if this mbuf is the only reference to it. */
if (*refcnt == 1 || atomic_fetchadd_int(refcnt, -1) == 1) {
o Gather all mbuf(9) allocation functions into kern_mbuf.c, and all mbuf(9) manipulation functions into uipc_mbuf.c. This looks like the initial intent, but had diffused in the last decade. o Gather all declarations in mbuf.h in one place and sort them. o Uninline m_clget() and m_cljget(). There are no functional changes in this patch. The patch comes from a larger version, where all mbuf(9) allocation was uninlined, which allowed to make mbuf(9) UMA zones private to kern_mbuf.c. The performance impact of the total uninlining is still unclear, so we are holding on now with larger version. Together with: melifaro, olivier
2016-02-11 21:32:23 +00:00
switch (m->m_ext.ext_type) {
New way to manage reference counting of mbuf external storage. The m_ext.ext_cnt pointer becomes a union. It can now hold the refcount value itself. To tell that m_ext.ext_flags flag EXT_FLAG_EMBREF is used. The first mbuf to attach a cluster stores the refcount. The further mbufs to reference the cluster point at refcount in the first mbuf. The first mbuf is freed only when the last reference is freed. The benefit over refcounts stored in separate slabs is that now refcounts of different, unrelated mbufs do not share a cache line. For EXT_EXTREF mbufs the zone_ext_refcnt is no longer needed, and m_extadd() becomes void, making widely used M_EXTADD macro safe. For EXT_SFBUF mbufs the sf_ext_ref() is removed, which was an optimization exactly against the cache aliasing problem with regular refcounting. Discussed with: rrs, rwatson, gnn, hiren, sbruno, np Reviewed by: rrs Differential Revision: https://reviews.freebsd.org/D5396 Sponsored by: Netflix
2016-03-01 00:17:14 +00:00
case EXT_PACKET:
/* The packet zone is special. */
if (*refcnt == 0)
*refcnt = 1;
uma_zfree(zone_pack, mref);
break;
o Gather all mbuf(9) allocation functions into kern_mbuf.c, and all mbuf(9) manipulation functions into uipc_mbuf.c. This looks like the initial intent, but had diffused in the last decade. o Gather all declarations in mbuf.h in one place and sort them. o Uninline m_clget() and m_cljget(). There are no functional changes in this patch. The patch comes from a larger version, where all mbuf(9) allocation was uninlined, which allowed to make mbuf(9) UMA zones private to kern_mbuf.c. The performance impact of the total uninlining is still unclear, so we are holding on now with larger version. Together with: melifaro, olivier
2016-02-11 21:32:23 +00:00
case EXT_CLUSTER:
uma_zfree(zone_clust, m->m_ext.ext_buf);
New way to manage reference counting of mbuf external storage. The m_ext.ext_cnt pointer becomes a union. It can now hold the refcount value itself. To tell that m_ext.ext_flags flag EXT_FLAG_EMBREF is used. The first mbuf to attach a cluster stores the refcount. The further mbufs to reference the cluster point at refcount in the first mbuf. The first mbuf is freed only when the last reference is freed. The benefit over refcounts stored in separate slabs is that now refcounts of different, unrelated mbufs do not share a cache line. For EXT_EXTREF mbufs the zone_ext_refcnt is no longer needed, and m_extadd() becomes void, making widely used M_EXTADD macro safe. For EXT_SFBUF mbufs the sf_ext_ref() is removed, which was an optimization exactly against the cache aliasing problem with regular refcounting. Discussed with: rrs, rwatson, gnn, hiren, sbruno, np Reviewed by: rrs Differential Revision: https://reviews.freebsd.org/D5396 Sponsored by: Netflix
2016-03-01 00:17:14 +00:00
uma_zfree(zone_mbuf, mref);
o Gather all mbuf(9) allocation functions into kern_mbuf.c, and all mbuf(9) manipulation functions into uipc_mbuf.c. This looks like the initial intent, but had diffused in the last decade. o Gather all declarations in mbuf.h in one place and sort them. o Uninline m_clget() and m_cljget(). There are no functional changes in this patch. The patch comes from a larger version, where all mbuf(9) allocation was uninlined, which allowed to make mbuf(9) UMA zones private to kern_mbuf.c. The performance impact of the total uninlining is still unclear, so we are holding on now with larger version. Together with: melifaro, olivier
2016-02-11 21:32:23 +00:00
break;
case EXT_JUMBOP:
uma_zfree(zone_jumbop, m->m_ext.ext_buf);
New way to manage reference counting of mbuf external storage. The m_ext.ext_cnt pointer becomes a union. It can now hold the refcount value itself. To tell that m_ext.ext_flags flag EXT_FLAG_EMBREF is used. The first mbuf to attach a cluster stores the refcount. The further mbufs to reference the cluster point at refcount in the first mbuf. The first mbuf is freed only when the last reference is freed. The benefit over refcounts stored in separate slabs is that now refcounts of different, unrelated mbufs do not share a cache line. For EXT_EXTREF mbufs the zone_ext_refcnt is no longer needed, and m_extadd() becomes void, making widely used M_EXTADD macro safe. For EXT_SFBUF mbufs the sf_ext_ref() is removed, which was an optimization exactly against the cache aliasing problem with regular refcounting. Discussed with: rrs, rwatson, gnn, hiren, sbruno, np Reviewed by: rrs Differential Revision: https://reviews.freebsd.org/D5396 Sponsored by: Netflix
2016-03-01 00:17:14 +00:00
uma_zfree(zone_mbuf, mref);
o Gather all mbuf(9) allocation functions into kern_mbuf.c, and all mbuf(9) manipulation functions into uipc_mbuf.c. This looks like the initial intent, but had diffused in the last decade. o Gather all declarations in mbuf.h in one place and sort them. o Uninline m_clget() and m_cljget(). There are no functional changes in this patch. The patch comes from a larger version, where all mbuf(9) allocation was uninlined, which allowed to make mbuf(9) UMA zones private to kern_mbuf.c. The performance impact of the total uninlining is still unclear, so we are holding on now with larger version. Together with: melifaro, olivier
2016-02-11 21:32:23 +00:00
break;
case EXT_JUMBO9:
uma_zfree(zone_jumbo9, m->m_ext.ext_buf);
New way to manage reference counting of mbuf external storage. The m_ext.ext_cnt pointer becomes a union. It can now hold the refcount value itself. To tell that m_ext.ext_flags flag EXT_FLAG_EMBREF is used. The first mbuf to attach a cluster stores the refcount. The further mbufs to reference the cluster point at refcount in the first mbuf. The first mbuf is freed only when the last reference is freed. The benefit over refcounts stored in separate slabs is that now refcounts of different, unrelated mbufs do not share a cache line. For EXT_EXTREF mbufs the zone_ext_refcnt is no longer needed, and m_extadd() becomes void, making widely used M_EXTADD macro safe. For EXT_SFBUF mbufs the sf_ext_ref() is removed, which was an optimization exactly against the cache aliasing problem with regular refcounting. Discussed with: rrs, rwatson, gnn, hiren, sbruno, np Reviewed by: rrs Differential Revision: https://reviews.freebsd.org/D5396 Sponsored by: Netflix
2016-03-01 00:17:14 +00:00
uma_zfree(zone_mbuf, mref);
o Gather all mbuf(9) allocation functions into kern_mbuf.c, and all mbuf(9) manipulation functions into uipc_mbuf.c. This looks like the initial intent, but had diffused in the last decade. o Gather all declarations in mbuf.h in one place and sort them. o Uninline m_clget() and m_cljget(). There are no functional changes in this patch. The patch comes from a larger version, where all mbuf(9) allocation was uninlined, which allowed to make mbuf(9) UMA zones private to kern_mbuf.c. The performance impact of the total uninlining is still unclear, so we are holding on now with larger version. Together with: melifaro, olivier
2016-02-11 21:32:23 +00:00
break;
case EXT_JUMBO16:
uma_zfree(zone_jumbo16, m->m_ext.ext_buf);
New way to manage reference counting of mbuf external storage. The m_ext.ext_cnt pointer becomes a union. It can now hold the refcount value itself. To tell that m_ext.ext_flags flag EXT_FLAG_EMBREF is used. The first mbuf to attach a cluster stores the refcount. The further mbufs to reference the cluster point at refcount in the first mbuf. The first mbuf is freed only when the last reference is freed. The benefit over refcounts stored in separate slabs is that now refcounts of different, unrelated mbufs do not share a cache line. For EXT_EXTREF mbufs the zone_ext_refcnt is no longer needed, and m_extadd() becomes void, making widely used M_EXTADD macro safe. For EXT_SFBUF mbufs the sf_ext_ref() is removed, which was an optimization exactly against the cache aliasing problem with regular refcounting. Discussed with: rrs, rwatson, gnn, hiren, sbruno, np Reviewed by: rrs Differential Revision: https://reviews.freebsd.org/D5396 Sponsored by: Netflix
2016-03-01 00:17:14 +00:00
uma_zfree(zone_mbuf, mref);
break;
case EXT_SFBUF:
o Gather all mbuf(9) allocation functions into kern_mbuf.c, and all mbuf(9) manipulation functions into uipc_mbuf.c. This looks like the initial intent, but had diffused in the last decade. o Gather all declarations in mbuf.h in one place and sort them. o Uninline m_clget() and m_cljget(). There are no functional changes in this patch. The patch comes from a larger version, where all mbuf(9) allocation was uninlined, which allowed to make mbuf(9) UMA zones private to kern_mbuf.c. The performance impact of the total uninlining is still unclear, so we are holding on now with larger version. Together with: melifaro, olivier
2016-02-11 21:32:23 +00:00
case EXT_NET_DRV:
case EXT_MOD_TYPE:
case EXT_DISPOSABLE:
In mb_dupcl() don't copy full m_ext, to avoid cache miss. Respectively, in mb_free_ext() always use fields from the original refcount holding mbuf (see. r296242) mbuf. Cuts another cache miss from mb_free_ext(). However, treat EXT_EXTREF mbufs differently, since they are different - they don't have a refcount holding mbuf. Provide longer comments in m_ext declaration to explain this change and change from r296242. In collaboration with: gallatin Differential Revision: https://reviews.freebsd.org/D12615
2017-10-09 20:51:58 +00:00
KASSERT(mref->m_ext.ext_free != NULL,
Style. MFC after: 3 days
2018-05-06 00:11:30 +00:00
("%s: ext_free not set", __func__));
In mb_dupcl() don't copy full m_ext, to avoid cache miss. Respectively, in mb_free_ext() always use fields from the original refcount holding mbuf (see. r296242) mbuf. Cuts another cache miss from mb_free_ext(). However, treat EXT_EXTREF mbufs differently, since they are different - they don't have a refcount holding mbuf. Provide longer comments in m_ext declaration to explain this change and change from r296242. In collaboration with: gallatin Differential Revision: https://reviews.freebsd.org/D12615
2017-10-09 20:51:58 +00:00
mref->m_ext.ext_free(mref);
New way to manage reference counting of mbuf external storage. The m_ext.ext_cnt pointer becomes a union. It can now hold the refcount value itself. To tell that m_ext.ext_flags flag EXT_FLAG_EMBREF is used. The first mbuf to attach a cluster stores the refcount. The further mbufs to reference the cluster point at refcount in the first mbuf. The first mbuf is freed only when the last reference is freed. The benefit over refcounts stored in separate slabs is that now refcounts of different, unrelated mbufs do not share a cache line. For EXT_EXTREF mbufs the zone_ext_refcnt is no longer needed, and m_extadd() becomes void, making widely used M_EXTADD macro safe. For EXT_SFBUF mbufs the sf_ext_ref() is removed, which was an optimization exactly against the cache aliasing problem with regular refcounting. Discussed with: rrs, rwatson, gnn, hiren, sbruno, np Reviewed by: rrs Differential Revision: https://reviews.freebsd.org/D5396 Sponsored by: Netflix
2016-03-01 00:17:14 +00:00
uma_zfree(zone_mbuf, mref);
Fix regression in r296242 affecting several drivers. For EXT_NET_DRV, EXT_MOD_TYPE, EXT_DISPOSABLE types we should first execute the free callback, then free the mbuf, otherwise we will derefernce memory that was just freed. Reported and tested: jhibbits
2016-03-02 02:12:01 +00:00
break;
o Gather all mbuf(9) allocation functions into kern_mbuf.c, and all mbuf(9) manipulation functions into uipc_mbuf.c. This looks like the initial intent, but had diffused in the last decade. o Gather all declarations in mbuf.h in one place and sort them. o Uninline m_clget() and m_cljget(). There are no functional changes in this patch. The patch comes from a larger version, where all mbuf(9) allocation was uninlined, which allowed to make mbuf(9) UMA zones private to kern_mbuf.c. The performance impact of the total uninlining is still unclear, so we are holding on now with larger version. Together with: melifaro, olivier
2016-02-11 21:32:23 +00:00
case EXT_EXTREF:
KASSERT(m->m_ext.ext_free != NULL,
Style. MFC after: 3 days
2018-05-06 00:11:30 +00:00
("%s: ext_free not set", __func__));
Shorten list of arguments to mbuf external storage freeing function. All of these arguments are stored in m_ext, so there is no reason to pass them in the argument list. Not all functions need the second argument, some don't even need the first one. The second argument lives in next cache line, so not dereferencing it is a performance gain. This was discovered in sendfile(2), which will be covered by next commits. The second goal of this commit is to bring even more flexibility to m_ext mbufs, allowing to create more fields in m_ext, opaque to the generic mbuf code, and potentially set and dereferenced by subsystems. Reviewed by: gallatin, kbowling Differential Revision: https://reviews.freebsd.org/D12615
2017-10-09 20:35:31 +00:00
m->m_ext.ext_free(m);
o Gather all mbuf(9) allocation functions into kern_mbuf.c, and all mbuf(9) manipulation functions into uipc_mbuf.c. This looks like the initial intent, but had diffused in the last decade. o Gather all declarations in mbuf.h in one place and sort them. o Uninline m_clget() and m_cljget(). There are no functional changes in this patch. The patch comes from a larger version, where all mbuf(9) allocation was uninlined, which allowed to make mbuf(9) UMA zones private to kern_mbuf.c. The performance impact of the total uninlining is still unclear, so we are holding on now with larger version. Together with: melifaro, olivier
2016-02-11 21:32:23 +00:00
break;
Add new m_ext type for data for M_NOFREE mbufs, which doesn't actually do anything except several assertions. This type is going to be used for temporary on stack mbufs, that point into data in receive ring of a NIC, that shall not be freed. Such mbuf can not be stored or reallocated, its life time is current context.
2019-01-31 22:37:28 +00:00
case EXT_RXRING:
KASSERT(m->m_ext.ext_free == NULL,
("%s: ext_free is set", __func__));
break;
o Gather all mbuf(9) allocation functions into kern_mbuf.c, and all mbuf(9) manipulation functions into uipc_mbuf.c. This looks like the initial intent, but had diffused in the last decade. o Gather all declarations in mbuf.h in one place and sort them. o Uninline m_clget() and m_cljget(). There are no functional changes in this patch. The patch comes from a larger version, where all mbuf(9) allocation was uninlined, which allowed to make mbuf(9) UMA zones private to kern_mbuf.c. The performance impact of the total uninlining is still unclear, so we are holding on now with larger version. Together with: melifaro, olivier
2016-02-11 21:32:23 +00:00
default:
KASSERT(m->m_ext.ext_type == 0,
Style. MFC after: 3 days
2018-05-06 00:11:30 +00:00
("%s: unknown ext_type", __func__));
o Gather all mbuf(9) allocation functions into kern_mbuf.c, and all mbuf(9) manipulation functions into uipc_mbuf.c. This looks like the initial intent, but had diffused in the last decade. o Gather all declarations in mbuf.h in one place and sort them. o Uninline m_clget() and m_cljget(). There are no functional changes in this patch. The patch comes from a larger version, where all mbuf(9) allocation was uninlined, which allowed to make mbuf(9) UMA zones private to kern_mbuf.c. The performance impact of the total uninlining is still unclear, so we are holding on now with larger version. Together with: melifaro, olivier
2016-02-11 21:32:23 +00:00
}
}
New way to manage reference counting of mbuf external storage. The m_ext.ext_cnt pointer becomes a union. It can now hold the refcount value itself. To tell that m_ext.ext_flags flag EXT_FLAG_EMBREF is used. The first mbuf to attach a cluster stores the refcount. The further mbufs to reference the cluster point at refcount in the first mbuf. The first mbuf is freed only when the last reference is freed. The benefit over refcounts stored in separate slabs is that now refcounts of different, unrelated mbufs do not share a cache line. For EXT_EXTREF mbufs the zone_ext_refcnt is no longer needed, and m_extadd() becomes void, making widely used M_EXTADD macro safe. For EXT_SFBUF mbufs the sf_ext_ref() is removed, which was an optimization exactly against the cache aliasing problem with regular refcounting. Discussed with: rrs, rwatson, gnn, hiren, sbruno, np Reviewed by: rrs Differential Revision: https://reviews.freebsd.org/D5396 Sponsored by: Netflix
2016-03-01 00:17:14 +00:00
if (freembuf && m != mref)
o Gather all mbuf(9) allocation functions into kern_mbuf.c, and all mbuf(9) manipulation functions into uipc_mbuf.c. This looks like the initial intent, but had diffused in the last decade. o Gather all declarations in mbuf.h in one place and sort them. o Uninline m_clget() and m_cljget(). There are no functional changes in this patch. The patch comes from a larger version, where all mbuf(9) allocation was uninlined, which allowed to make mbuf(9) UMA zones private to kern_mbuf.c. The performance impact of the total uninlining is still unclear, so we are holding on now with larger version. Together with: melifaro, olivier
2016-02-11 21:32:23 +00:00
uma_zfree(zone_mbuf, m);
}
Step 4.2: start divorce of M_EXT and M_EXTPG They have more differencies than similarities. For now there is lots of code that would check for M_EXT only and work correctly on M_EXTPG buffers, so still carry M_EXT bit together with M_EXTPG. However, prepare some code for explicit check for M_EXTPG. Reviewed by: gallatin Differential Revision: https://reviews.freebsd.org/D24598
2020-05-03 00:37:16 +00:00
/*
* Clean up after mbufs with M_EXTPG storage attached to them if the
* reference count hits 1.
*/
void
mb_free_extpg(struct mbuf *m)
{
volatile u_int *refcnt;
struct mbuf *mref;
M_ASSERTEXTPG(m);
/* See if this is the mbuf that holds the embedded refcount. */
if (m->m_ext.ext_flags & EXT_FLAG_EMBREF) {
refcnt = &m->m_ext.ext_count;
mref = m;
} else {
KASSERT(m->m_ext.ext_cnt != NULL,
("%s: no refcounting pointer on %p", __func__, m));
refcnt = m->m_ext.ext_cnt;
mref = __containerof(refcnt, struct mbuf, m_ext.ext_count);
}
/* Free attached storage if this mbuf is the only reference to it. */
if (*refcnt == 1 || atomic_fetchadd_int(refcnt, -1) == 1) {
KASSERT(mref->m_ext.ext_free != NULL,
("%s: ext_free not set", __func__));
mref->m_ext.ext_free(mref);
#ifdef KERN_TLS
if (mref->m_epg_tls != NULL &&
!refcount_release_if_not_last(&mref->m_epg_tls->refcount))
ktls_enqueue_to_free(mref);
else
#endif
uma_zfree(zone_mbuf, mref);
}
if (m != mref)
uma_zfree(zone_mbuf, m);
}
o Gather all mbuf(9) allocation functions into kern_mbuf.c, and all mbuf(9) manipulation functions into uipc_mbuf.c. This looks like the initial intent, but had diffused in the last decade. o Gather all declarations in mbuf.h in one place and sort them. o Uninline m_clget() and m_cljget(). There are no functional changes in this patch. The patch comes from a larger version, where all mbuf(9) allocation was uninlined, which allowed to make mbuf(9) UMA zones private to kern_mbuf.c. The performance impact of the total uninlining is still unclear, so we are holding on now with larger version. Together with: melifaro, olivier
2016-02-11 21:32:23 +00:00
/*
* Official mbuf(9) allocation KPI for stack and drivers:
*
* m_get() - a single mbuf without any attachments, sys/mbuf.h.
* m_gethdr() - a single mbuf initialized as M_PKTHDR, sys/mbuf.h.
* m_getcl() - an mbuf + 2k cluster, sys/mbuf.h.
* m_clget() - attach cluster to already allocated mbuf.
* m_cljget() - attach jumbo cluster to already allocated mbuf.
* m_get2() - allocate minimum mbuf that would fit size argument.
* m_getm2() - allocate a chain of mbufs/clusters.
* m_extadd() - attach external cluster to mbuf.
*
* m_free() - free single mbuf with its tags and ext, sys/mbuf.h.
* m_freem() - free chain of mbufs.
*/
int
m_clget(struct mbuf *m, int how)
{
KASSERT((m->m_flags & M_EXT) == 0, ("%s: mbuf %p has M_EXT",
__func__, m));
m->m_ext.ext_buf = (char *)NULL;
uma_zalloc_arg(zone_clust, m, how);
/*
* On a cluster allocation failure, drain the packet zone and retry,
* we might be able to loosen a few clusters up on the drain.
*/
if ((how & M_NOWAIT) && (m->m_ext.ext_buf == NULL)) {
Extend uma_reclaim() to permit different reclamation targets. The page daemon periodically invokes uma_reclaim() to reclaim cached items from each zone when the system is under memory pressure. This is important since the size of these caches is unbounded by default. However it also results in bursts of high latency when allocating from heavily used zones as threads miss in the per-CPU caches and must access the keg in order to allocate new items. With r340405 we maintain an estimate of each zone's usage of its (per-NUMA domain) cache of full buckets. Start making use of this estimate to avoid reclaiming the entire cache when under memory pressure. In particular, introduce TRIM, DRAIN and DRAIN_CPU verbs for uma_reclaim() and uma_zone_reclaim(). When trimming, only items in excess of the estimate are reclaimed. Draining a zone reclaims all of the cached full buckets (the previous behaviour of uma_reclaim()), and may further drain the per-CPU caches in extreme cases. Now, when under memory pressure, the page daemon will trim zones rather than draining them. As a result, heavily used zones do not incur bursts of bucket cache misses following reclamation, but large, unused caches will be reclaimed as before. Reviewed by: jeff Tested by: pho (an earlier version) MFC after: 2 months Sponsored by: Netflix Differential Revision: https://reviews.freebsd.org/D16667
2019-09-01 22:22:43 +00:00
uma_zone_reclaim(zone_pack, UMA_RECLAIM_DRAIN);
o Gather all mbuf(9) allocation functions into kern_mbuf.c, and all mbuf(9) manipulation functions into uipc_mbuf.c. This looks like the initial intent, but had diffused in the last decade. o Gather all declarations in mbuf.h in one place and sort them. o Uninline m_clget() and m_cljget(). There are no functional changes in this patch. The patch comes from a larger version, where all mbuf(9) allocation was uninlined, which allowed to make mbuf(9) UMA zones private to kern_mbuf.c. The performance impact of the total uninlining is still unclear, so we are holding on now with larger version. Together with: melifaro, olivier
2016-02-11 21:32:23 +00:00
uma_zalloc_arg(zone_clust, m, how);
}
Add an mbuf provider to DTrace. The mbuf provider is made up of a set of Statically Defined Tracepoints which help us look into mbufs as they are allocated and freed. This can be used to inspect the buffers or for a simplified mbuf leak detector. New tracepoints are: mbuf:::m-init mbuf:::m-gethdr mbuf:::m-get mbuf:::m-getcl mbuf:::m-clget mbuf:::m-cljget mbuf:::m-cljset mbuf:::m-free mbuf:::m-freem There is also a translator for mbufs which gives some visibility into the structure, see mbuf.d for more details. Reviewed by: bz, markj MFC after: 2 weeks Sponsored by: Rubicon Communications (Netgate) Differential Revision: https://reviews.freebsd.org/D5682
2016-03-22 13:16:52 +00:00
MBUF_PROBE2(m__clget, m, how);
o Gather all mbuf(9) allocation functions into kern_mbuf.c, and all mbuf(9) manipulation functions into uipc_mbuf.c. This looks like the initial intent, but had diffused in the last decade. o Gather all declarations in mbuf.h in one place and sort them. o Uninline m_clget() and m_cljget(). There are no functional changes in this patch. The patch comes from a larger version, where all mbuf(9) allocation was uninlined, which allowed to make mbuf(9) UMA zones private to kern_mbuf.c. The performance impact of the total uninlining is still unclear, so we are holding on now with larger version. Together with: melifaro, olivier
2016-02-11 21:32:23 +00:00
return (m->m_flags & M_EXT);
}
/*
* m_cljget() is different from m_clget() as it can allocate clusters without
* attaching them to an mbuf. In that case the return value is the pointer
* to the cluster of the requested size. If an mbuf was specified, it gets
* the cluster attached to it and the return value can be safely ignored.
* For size it takes MCLBYTES, MJUMPAGESIZE, MJUM9BYTES, MJUM16BYTES.
*/
void *
m_cljget(struct mbuf *m, int how, int size)
{
uma_zone_t zone;
Add an mbuf provider to DTrace. The mbuf provider is made up of a set of Statically Defined Tracepoints which help us look into mbufs as they are allocated and freed. This can be used to inspect the buffers or for a simplified mbuf leak detector. New tracepoints are: mbuf:::m-init mbuf:::m-gethdr mbuf:::m-get mbuf:::m-getcl mbuf:::m-clget mbuf:::m-cljget mbuf:::m-cljset mbuf:::m-free mbuf:::m-freem There is also a translator for mbufs which gives some visibility into the structure, see mbuf.d for more details. Reviewed by: bz, markj MFC after: 2 weeks Sponsored by: Rubicon Communications (Netgate) Differential Revision: https://reviews.freebsd.org/D5682
2016-03-22 13:16:52 +00:00
void *retval;
Space and style(9) corrections for recent mbuf changes.
2016-03-24 20:06:52 +00:00
o Gather all mbuf(9) allocation functions into kern_mbuf.c, and all mbuf(9) manipulation functions into uipc_mbuf.c. This looks like the initial intent, but had diffused in the last decade. o Gather all declarations in mbuf.h in one place and sort them. o Uninline m_clget() and m_cljget(). There are no functional changes in this patch. The patch comes from a larger version, where all mbuf(9) allocation was uninlined, which allowed to make mbuf(9) UMA zones private to kern_mbuf.c. The performance impact of the total uninlining is still unclear, so we are holding on now with larger version. Together with: melifaro, olivier
2016-02-11 21:32:23 +00:00
if (m != NULL) {
KASSERT((m->m_flags & M_EXT) == 0, ("%s: mbuf %p has M_EXT",
__func__, m));
m->m_ext.ext_buf = NULL;
}
zone = m_getzone(size);
Add an mbuf provider to DTrace. The mbuf provider is made up of a set of Statically Defined Tracepoints which help us look into mbufs as they are allocated and freed. This can be used to inspect the buffers or for a simplified mbuf leak detector. New tracepoints are: mbuf:::m-init mbuf:::m-gethdr mbuf:::m-get mbuf:::m-getcl mbuf:::m-clget mbuf:::m-cljget mbuf:::m-cljset mbuf:::m-free mbuf:::m-freem There is also a translator for mbufs which gives some visibility into the structure, see mbuf.d for more details. Reviewed by: bz, markj MFC after: 2 weeks Sponsored by: Rubicon Communications (Netgate) Differential Revision: https://reviews.freebsd.org/D5682
2016-03-22 13:16:52 +00:00
retval = uma_zalloc_arg(zone, m, how);
MBUF_PROBE4(m__cljget, m, how, size, retval);
return (retval);
o Gather all mbuf(9) allocation functions into kern_mbuf.c, and all mbuf(9) manipulation functions into uipc_mbuf.c. This looks like the initial intent, but had diffused in the last decade. o Gather all declarations in mbuf.h in one place and sort them. o Uninline m_clget() and m_cljget(). There are no functional changes in this patch. The patch comes from a larger version, where all mbuf(9) allocation was uninlined, which allowed to make mbuf(9) UMA zones private to kern_mbuf.c. The performance impact of the total uninlining is still unclear, so we are holding on now with larger version. Together with: melifaro, olivier
2016-02-11 21:32:23 +00:00
}
/*
* m_get2() allocates minimum mbuf that would fit "size" argument.
*/
struct mbuf *
m_get2(int size, int how, short type, int flags)
{
struct mb_args args;
struct mbuf *m, *n;
args.flags = flags;
args.type = type;
if (size <= MHLEN || (size <= MLEN && (flags & M_PKTHDR) == 0))
return (uma_zalloc_arg(zone_mbuf, &args, how));
if (size <= MCLBYTES)
return (uma_zalloc_arg(zone_pack, &args, how));
if (size > MJUMPAGESIZE)
return (NULL);
m = uma_zalloc_arg(zone_mbuf, &args, how);
if (m == NULL)
return (NULL);
n = uma_zalloc_arg(zone_jumbop, m, how);
if (n == NULL) {
uma_zfree(zone_mbuf, m);
return (NULL);
}
return (m);
}
/*
* m_getjcl() returns an mbuf with a cluster of the specified size attached.
* For size it takes MCLBYTES, MJUMPAGESIZE, MJUM9BYTES, MJUM16BYTES.
*/
struct mbuf *
m_getjcl(int how, short type, int flags, int size)
{
struct mb_args args;
struct mbuf *m, *n;
uma_zone_t zone;
if (size == MCLBYTES)
return m_getcl(how, type, flags);
args.flags = flags;
args.type = type;
m = uma_zalloc_arg(zone_mbuf, &args, how);
if (m == NULL)
return (NULL);
zone = m_getzone(size);
n = uma_zalloc_arg(zone, m, how);
if (n == NULL) {
uma_zfree(zone_mbuf, m);
return (NULL);
}
Add m__getjcl SDT probe. Obtained from: Yandex LLC MFC after: 1 week Sponsored by: Yandex LLC
2020-08-05 11:39:09 +00:00
MBUF_PROBE5(m__getjcl, how, type, flags, size, m);
o Gather all mbuf(9) allocation functions into kern_mbuf.c, and all mbuf(9) manipulation functions into uipc_mbuf.c. This looks like the initial intent, but had diffused in the last decade. o Gather all declarations in mbuf.h in one place and sort them. o Uninline m_clget() and m_cljget(). There are no functional changes in this patch. The patch comes from a larger version, where all mbuf(9) allocation was uninlined, which allowed to make mbuf(9) UMA zones private to kern_mbuf.c. The performance impact of the total uninlining is still unclear, so we are holding on now with larger version. Together with: melifaro, olivier
2016-02-11 21:32:23 +00:00
return (m);
}
/*
* Allocate a given length worth of mbufs and/or clusters (whatever fits
* best) and return a pointer to the top of the allocated chain. If an
* existing mbuf chain is provided, then we will append the new chain
m_getm2: correct a comment. The comment states that function always return a top of allocated mbuf; however, the function actually return the overall mbuf chain top pointer. Since there are already existing users of it (via m_getm(4) macro), rephrase the comment and leave behavior unchanged. PR: 134335 MFC after: 12 days
2019-01-27 16:44:27 +00:00
* to the existing one and return a pointer to the provided mbuf.
o Gather all mbuf(9) allocation functions into kern_mbuf.c, and all mbuf(9) manipulation functions into uipc_mbuf.c. This looks like the initial intent, but had diffused in the last decade. o Gather all declarations in mbuf.h in one place and sort them. o Uninline m_clget() and m_cljget(). There are no functional changes in this patch. The patch comes from a larger version, where all mbuf(9) allocation was uninlined, which allowed to make mbuf(9) UMA zones private to kern_mbuf.c. The performance impact of the total uninlining is still unclear, so we are holding on now with larger version. Together with: melifaro, olivier
2016-02-11 21:32:23 +00:00
*/
struct mbuf *
m_getm2(struct mbuf *m, int len, int how, short type, int flags)
{
struct mbuf *mb, *nm = NULL, *mtail = NULL;
KASSERT(len >= 0, ("%s: len is < 0", __func__));
/* Validate flags. */
flags &= (M_PKTHDR | M_EOR);
/* Packet header mbuf must be first in chain. */
if ((flags & M_PKTHDR) && m != NULL)
flags &= ~M_PKTHDR;
/* Loop and append maximum sized mbufs to the chain tail. */
while (len > 0) {
make m_getm2() resilient to zone_jumbop exhaustion When the zone_jumbop is exhausted, most things using using sosend* (like sshd) will eventually fail or hang if allocations are limited to the depleted jumbop zone. This makes it imossible to communicate with a box which is under an attach which exhausts the jumbop zone. Rather than depending on the page size zone, also try cluster allocations to satisfy larger requests. This allows me to ssh to, and serve 100Gb/s of traffic from a server which under attack and has had its page-sized zone exhausted. Reviewed by: glebius, markj, rmacklem Sponsored by: Netflix Differential Revision: https://reviews.freebsd.org/D26150
2020-08-31 13:53:14 +00:00
mb = NULL;
if (len > MCLBYTES) {
mb = m_getjcl(M_NOWAIT, type, (flags & M_PKTHDR),
o Gather all mbuf(9) allocation functions into kern_mbuf.c, and all mbuf(9) manipulation functions into uipc_mbuf.c. This looks like the initial intent, but had diffused in the last decade. o Gather all declarations in mbuf.h in one place and sort them. o Uninline m_clget() and m_cljget(). There are no functional changes in this patch. The patch comes from a larger version, where all mbuf(9) allocation was uninlined, which allowed to make mbuf(9) UMA zones private to kern_mbuf.c. The performance impact of the total uninlining is still unclear, so we are holding on now with larger version. Together with: melifaro, olivier
2016-02-11 21:32:23 +00:00
MJUMPAGESIZE);
make m_getm2() resilient to zone_jumbop exhaustion When the zone_jumbop is exhausted, most things using using sosend* (like sshd) will eventually fail or hang if allocations are limited to the depleted jumbop zone. This makes it imossible to communicate with a box which is under an attach which exhausts the jumbop zone. Rather than depending on the page size zone, also try cluster allocations to satisfy larger requests. This allows me to ssh to, and serve 100Gb/s of traffic from a server which under attack and has had its page-sized zone exhausted. Reviewed by: glebius, markj, rmacklem Sponsored by: Netflix Differential Revision: https://reviews.freebsd.org/D26150
2020-08-31 13:53:14 +00:00
}
o Gather all mbuf(9) allocation functions into kern_mbuf.c, and all mbuf(9) manipulation functions into uipc_mbuf.c. This looks like the initial intent, but had diffused in the last decade. o Gather all declarations in mbuf.h in one place and sort them. o Uninline m_clget() and m_cljget(). There are no functional changes in this patch. The patch comes from a larger version, where all mbuf(9) allocation was uninlined, which allowed to make mbuf(9) UMA zones private to kern_mbuf.c. The performance impact of the total uninlining is still unclear, so we are holding on now with larger version. Together with: melifaro, olivier
2016-02-11 21:32:23 +00:00
if (mb == NULL) {
make m_getm2() resilient to zone_jumbop exhaustion When the zone_jumbop is exhausted, most things using using sosend* (like sshd) will eventually fail or hang if allocations are limited to the depleted jumbop zone. This makes it imossible to communicate with a box which is under an attach which exhausts the jumbop zone. Rather than depending on the page size zone, also try cluster allocations to satisfy larger requests. This allows me to ssh to, and serve 100Gb/s of traffic from a server which under attack and has had its page-sized zone exhausted. Reviewed by: glebius, markj, rmacklem Sponsored by: Netflix Differential Revision: https://reviews.freebsd.org/D26150
2020-08-31 13:53:14 +00:00
if (len >= MINCLSIZE)
mb = m_getcl(how, type, (flags & M_PKTHDR));
else if (flags & M_PKTHDR)
mb = m_gethdr(how, type);
else
mb = m_get(how, type);
/*
* Fail the whole operation if one mbuf can't be
* allocated.
*/
if (mb == NULL) {
o Gather all mbuf(9) allocation functions into kern_mbuf.c, and all mbuf(9) manipulation functions into uipc_mbuf.c. This looks like the initial intent, but had diffused in the last decade. o Gather all declarations in mbuf.h in one place and sort them. o Uninline m_clget() and m_cljget(). There are no functional changes in this patch. The patch comes from a larger version, where all mbuf(9) allocation was uninlined, which allowed to make mbuf(9) UMA zones private to kern_mbuf.c. The performance impact of the total uninlining is still unclear, so we are holding on now with larger version. Together with: melifaro, olivier
2016-02-11 21:32:23 +00:00
m_freem(nm);
make m_getm2() resilient to zone_jumbop exhaustion When the zone_jumbop is exhausted, most things using using sosend* (like sshd) will eventually fail or hang if allocations are limited to the depleted jumbop zone. This makes it imossible to communicate with a box which is under an attach which exhausts the jumbop zone. Rather than depending on the page size zone, also try cluster allocations to satisfy larger requests. This allows me to ssh to, and serve 100Gb/s of traffic from a server which under attack and has had its page-sized zone exhausted. Reviewed by: glebius, markj, rmacklem Sponsored by: Netflix Differential Revision: https://reviews.freebsd.org/D26150
2020-08-31 13:53:14 +00:00
return (NULL);
}
o Gather all mbuf(9) allocation functions into kern_mbuf.c, and all mbuf(9) manipulation functions into uipc_mbuf.c. This looks like the initial intent, but had diffused in the last decade. o Gather all declarations in mbuf.h in one place and sort them. o Uninline m_clget() and m_cljget(). There are no functional changes in this patch. The patch comes from a larger version, where all mbuf(9) allocation was uninlined, which allowed to make mbuf(9) UMA zones private to kern_mbuf.c. The performance impact of the total uninlining is still unclear, so we are holding on now with larger version. Together with: melifaro, olivier
2016-02-11 21:32:23 +00:00
}
/* Book keeping. */
len -= M_SIZE(mb);
if (mtail != NULL)
mtail->m_next = mb;
else
nm = mb;
mtail = mb;
flags &= ~M_PKTHDR; /* Only valid on the first mbuf. */
}
if (flags & M_EOR)
mtail->m_flags |= M_EOR; /* Only valid on the last mbuf. */
/* If mbuf was supplied, append new chain to the end of it. */
if (m != NULL) {
for (mtail = m; mtail->m_next != NULL; mtail = mtail->m_next)
;
mtail->m_next = nm;
mtail->m_flags &= ~M_EOR;
} else
m = nm;
return (m);
}
/*-
* Configure a provided mbuf to refer to the provided external storage
New way to manage reference counting of mbuf external storage. The m_ext.ext_cnt pointer becomes a union. It can now hold the refcount value itself. To tell that m_ext.ext_flags flag EXT_FLAG_EMBREF is used. The first mbuf to attach a cluster stores the refcount. The further mbufs to reference the cluster point at refcount in the first mbuf. The first mbuf is freed only when the last reference is freed. The benefit over refcounts stored in separate slabs is that now refcounts of different, unrelated mbufs do not share a cache line. For EXT_EXTREF mbufs the zone_ext_refcnt is no longer needed, and m_extadd() becomes void, making widely used M_EXTADD macro safe. For EXT_SFBUF mbufs the sf_ext_ref() is removed, which was an optimization exactly against the cache aliasing problem with regular refcounting. Discussed with: rrs, rwatson, gnn, hiren, sbruno, np Reviewed by: rrs Differential Revision: https://reviews.freebsd.org/D5396 Sponsored by: Netflix
2016-03-01 00:17:14 +00:00
* buffer and setup a reference count for said buffer.
o Gather all mbuf(9) allocation functions into kern_mbuf.c, and all mbuf(9) manipulation functions into uipc_mbuf.c. This looks like the initial intent, but had diffused in the last decade. o Gather all declarations in mbuf.h in one place and sort them. o Uninline m_clget() and m_cljget(). There are no functional changes in this patch. The patch comes from a larger version, where all mbuf(9) allocation was uninlined, which allowed to make mbuf(9) UMA zones private to kern_mbuf.c. The performance impact of the total uninlining is still unclear, so we are holding on now with larger version. Together with: melifaro, olivier
2016-02-11 21:32:23 +00:00
*
* Arguments:
* mb The existing mbuf to which to attach the provided buffer.
* buf The address of the provided external storage buffer.
* size The size of the provided buffer.
* freef A pointer to a routine that is responsible for freeing the
* provided external storage buffer.
* args A pointer to an argument structure (of any type) to be passed
* to the provided freef routine (may be NULL).
* flags Any other flags to be passed to the provided mbuf.
* type The type that the external storage buffer should be
* labeled with.
*
* Returns:
* Nothing.
*/
New way to manage reference counting of mbuf external storage. The m_ext.ext_cnt pointer becomes a union. It can now hold the refcount value itself. To tell that m_ext.ext_flags flag EXT_FLAG_EMBREF is used. The first mbuf to attach a cluster stores the refcount. The further mbufs to reference the cluster point at refcount in the first mbuf. The first mbuf is freed only when the last reference is freed. The benefit over refcounts stored in separate slabs is that now refcounts of different, unrelated mbufs do not share a cache line. For EXT_EXTREF mbufs the zone_ext_refcnt is no longer needed, and m_extadd() becomes void, making widely used M_EXTADD macro safe. For EXT_SFBUF mbufs the sf_ext_ref() is removed, which was an optimization exactly against the cache aliasing problem with regular refcounting. Discussed with: rrs, rwatson, gnn, hiren, sbruno, np Reviewed by: rrs Differential Revision: https://reviews.freebsd.org/D5396 Sponsored by: Netflix
2016-03-01 00:17:14 +00:00
void
Shorten list of arguments to mbuf external storage freeing function. All of these arguments are stored in m_ext, so there is no reason to pass them in the argument list. Not all functions need the second argument, some don't even need the first one. The second argument lives in next cache line, so not dereferencing it is a performance gain. This was discovered in sendfile(2), which will be covered by next commits. The second goal of this commit is to bring even more flexibility to m_ext mbufs, allowing to create more fields in m_ext, opaque to the generic mbuf code, and potentially set and dereferenced by subsystems. Reviewed by: gallatin, kbowling Differential Revision: https://reviews.freebsd.org/D12615
2017-10-09 20:35:31 +00:00
m_extadd(struct mbuf *mb, char *buf, u_int size, m_ext_free_t freef,
void *arg1, void *arg2, int flags, int type)
o Gather all mbuf(9) allocation functions into kern_mbuf.c, and all mbuf(9) manipulation functions into uipc_mbuf.c. This looks like the initial intent, but had diffused in the last decade. o Gather all declarations in mbuf.h in one place and sort them. o Uninline m_clget() and m_cljget(). There are no functional changes in this patch. The patch comes from a larger version, where all mbuf(9) allocation was uninlined, which allowed to make mbuf(9) UMA zones private to kern_mbuf.c. The performance impact of the total uninlining is still unclear, so we are holding on now with larger version. Together with: melifaro, olivier
2016-02-11 21:32:23 +00:00
{
New way to manage reference counting of mbuf external storage. The m_ext.ext_cnt pointer becomes a union. It can now hold the refcount value itself. To tell that m_ext.ext_flags flag EXT_FLAG_EMBREF is used. The first mbuf to attach a cluster stores the refcount. The further mbufs to reference the cluster point at refcount in the first mbuf. The first mbuf is freed only when the last reference is freed. The benefit over refcounts stored in separate slabs is that now refcounts of different, unrelated mbufs do not share a cache line. For EXT_EXTREF mbufs the zone_ext_refcnt is no longer needed, and m_extadd() becomes void, making widely used M_EXTADD macro safe. For EXT_SFBUF mbufs the sf_ext_ref() is removed, which was an optimization exactly against the cache aliasing problem with regular refcounting. Discussed with: rrs, rwatson, gnn, hiren, sbruno, np Reviewed by: rrs Differential Revision: https://reviews.freebsd.org/D5396 Sponsored by: Netflix
2016-03-01 00:17:14 +00:00
KASSERT(type != EXT_CLUSTER, ("%s: EXT_CLUSTER not allowed", __func__));
o Gather all mbuf(9) allocation functions into kern_mbuf.c, and all mbuf(9) manipulation functions into uipc_mbuf.c. This looks like the initial intent, but had diffused in the last decade. o Gather all declarations in mbuf.h in one place and sort them. o Uninline m_clget() and m_cljget(). There are no functional changes in this patch. The patch comes from a larger version, where all mbuf(9) allocation was uninlined, which allowed to make mbuf(9) UMA zones private to kern_mbuf.c. The performance impact of the total uninlining is still unclear, so we are holding on now with larger version. Together with: melifaro, olivier
2016-02-11 21:32:23 +00:00
mb->m_flags |= (M_EXT | flags);
mb->m_ext.ext_buf = buf;
mb->m_data = mb->m_ext.ext_buf;
mb->m_ext.ext_size = size;
mb->m_ext.ext_free = freef;
mb->m_ext.ext_arg1 = arg1;
mb->m_ext.ext_arg2 = arg2;
mb->m_ext.ext_type = type;
New way to manage reference counting of mbuf external storage. The m_ext.ext_cnt pointer becomes a union. It can now hold the refcount value itself. To tell that m_ext.ext_flags flag EXT_FLAG_EMBREF is used. The first mbuf to attach a cluster stores the refcount. The further mbufs to reference the cluster point at refcount in the first mbuf. The first mbuf is freed only when the last reference is freed. The benefit over refcounts stored in separate slabs is that now refcounts of different, unrelated mbufs do not share a cache line. For EXT_EXTREF mbufs the zone_ext_refcnt is no longer needed, and m_extadd() becomes void, making widely used M_EXTADD macro safe. For EXT_SFBUF mbufs the sf_ext_ref() is removed, which was an optimization exactly against the cache aliasing problem with regular refcounting. Discussed with: rrs, rwatson, gnn, hiren, sbruno, np Reviewed by: rrs Differential Revision: https://reviews.freebsd.org/D5396 Sponsored by: Netflix
2016-03-01 00:17:14 +00:00
if (type != EXT_EXTREF) {
mb->m_ext.ext_count = 1;
mb->m_ext.ext_flags = EXT_FLAG_EMBREF;
} else
mb->m_ext.ext_flags = 0;
o Gather all mbuf(9) allocation functions into kern_mbuf.c, and all mbuf(9) manipulation functions into uipc_mbuf.c. This looks like the initial intent, but had diffused in the last decade. o Gather all declarations in mbuf.h in one place and sort them. o Uninline m_clget() and m_cljget(). There are no functional changes in this patch. The patch comes from a larger version, where all mbuf(9) allocation was uninlined, which allowed to make mbuf(9) UMA zones private to kern_mbuf.c. The performance impact of the total uninlining is still unclear, so we are holding on now with larger version. Together with: melifaro, olivier
2016-02-11 21:32:23 +00:00
}
/*
* Free an entire chain of mbufs and associated external buffers, if
* applicable.
*/
void
m_freem(struct mbuf *mb)
{
Space and style(9) corrections for recent mbuf changes.
2016-03-24 20:06:52 +00:00
MBUF_PROBE1(m__freem, mb);
o Gather all mbuf(9) allocation functions into kern_mbuf.c, and all mbuf(9) manipulation functions into uipc_mbuf.c. This looks like the initial intent, but had diffused in the last decade. o Gather all declarations in mbuf.h in one place and sort them. o Uninline m_clget() and m_cljget(). There are no functional changes in this patch. The patch comes from a larger version, where all mbuf(9) allocation was uninlined, which allowed to make mbuf(9) UMA zones private to kern_mbuf.c. The performance impact of the total uninlining is still unclear, so we are holding on now with larger version. Together with: melifaro, olivier
2016-02-11 21:32:23 +00:00
while (mb != NULL)
mb = m_free(mb);
}
Restructure mbuf send tags to provide stronger guarantees. - Perform ifp mismatch checks (to determine if a send tag is allocated for a different ifp than the one the packet is being output on), in ip_output() and ip6_output(). This avoids sending packets with send tags to ifnet drivers that don't support send tags. Since we are now checking for ifp mismatches before invoking if_output, we can now try to allocate a new tag before invoking if_output sending the original packet on the new tag if allocation succeeds. To avoid code duplication for the fragment and unfragmented cases, add ip_output_send() and ip6_output_send() as wrappers around if_output and nd6_output_ifp, respectively. All of the logic for setting send tags and dealing with send tag-related errors is done in these wrapper functions. For pseudo interfaces that wrap other network interfaces (vlan and lagg), wrapper send tags are now allocated so that ip*_output see the wrapper ifp as the ifp in the send tag. The if_transmit routines rewrite the send tags after performing an ifp mismatch check. If an ifp mismatch is detected, the transmit routines fail with EAGAIN. - To provide clearer life cycle management of send tags, especially in the presence of vlan and lagg wrapper tags, add a reference count to send tags managed via m_snd_tag_ref() and m_snd_tag_rele(). Provide a helper function (m_snd_tag_init()) for use by drivers supporting send tags. m_snd_tag_init() takes care of the if_ref on the ifp meaning that code alloating send tags via if_snd_tag_alloc no longer has to manage that manually. Similarly, m_snd_tag_rele drops the refcount on the ifp after invoking if_snd_tag_free when the last reference to a send tag is dropped. This also closes use after free races if there are pending packets in driver tx rings after the socket is closed (e.g. from tcpdrop). In order for m_free to work reliably, add a new CSUM_SND_TAG flag in csum_flags to indicate 'snd_tag' is set (rather than 'rcvif'). Drivers now also check this flag instead of checking snd_tag against NULL. This avoids false positive matches when a forwarded packet has a non-NULL rcvif that was treated as a send tag. - cxgbe was relying on snd_tag_free being called when the inp was detached so that it could kick the firmware to flush any pending work on the flow. This is because the driver doesn't require ACK messages from the firmware for every request, but instead does a kind of manual interrupt coalescing by only setting a flag to request a completion on a subset of requests. If all of the in-flight requests don't have the flag when the tag is detached from the inp, the flow might never return the credits. The current snd_tag_free command issues a flush command to force the credits to return. However, the credit return is what also frees the mbufs, and since those mbufs now hold references on the tag, this meant that snd_tag_free would never be called. To fix, explicitly drop the mbuf's reference on the snd tag when the mbuf is queued in the firmware work queue. This means that once the inp's reference on the tag goes away and all in-flight mbufs have been queued to the firmware, tag's refcount will drop to zero and snd_tag_free will kick in and send the flush request. Note that we need to avoid doing this in the middle of ethofld_tx(), so the driver grabs a temporary reference on the tag around that loop to defer the free to the end of the function in case it sends the last mbuf to the queue after the inp has dropped its reference on the tag. - mlx5 preallocates send tags and was using the ifp pointer even when the send tag wasn't in use. Explicitly use the ifp from other data structures instead. - Sprinkle some assertions in various places to assert that received packets don't have a send tag, and that other places that overwrite rcvif (e.g. 802.11 transmit) don't clobber a send tag pointer. Reviewed by: gallatin, hselasky, rgrimes, ae Sponsored by: Netflix Differential Revision: https://reviews.freebsd.org/D20117
2019-05-24 22:30:40 +00:00
void
m_snd_tag_init(struct m_snd_tag *mst, struct ifnet *ifp)
{
if_ref(ifp);
mst->ifp = ifp;
refcount_init(&mst->refcount, 1);
counter_u64_add(snd_tag_count, 1);
}
void
m_snd_tag_destroy(struct m_snd_tag *mst)
{
struct ifnet *ifp;
ifp = mst->ifp;
ifp->if_snd_tag_free(mst);
if_rele(ifp);
counter_u64_add(snd_tag_count, -1);
}
Add two functions that create M_EXTPG mbufs with anonymous pages. These two functions are needed by nfs-over-tls, but could also be useful for other purposes. mb_alloc_ext_plus_pages() - Allocates a M_EXTPG mbuf and enough anonymous pages to store "len" data bytes. mb_mapped_to_unmapped() - Copies the data from a list of mapped (non-M_EXTPG) mbufs into a list of M_EXTPG mbufs allocated with anonymous pages. This is roughly the inverse of mb_unmapped_to_ext(). Reviewed by: gallatin Differential Revision: https://reviews.freebsd.org/D25182
2020-06-10 02:51:39 +00:00
/*
* Allocate an mbuf with anonymous external pages.
*/
struct mbuf *
mb_alloc_ext_plus_pages(int len, int how)
{
struct mbuf *m;
vm_page_t pg;
int i, npgs;
m = mb_alloc_ext_pgs(how, mb_free_mext_pgs);
if (m == NULL)
return (NULL);
m->m_epg_flags |= EPG_FLAG_ANON;
npgs = howmany(len, PAGE_SIZE);
for (i = 0; i < npgs; i++) {
do {
pg = vm_page_alloc(NULL, 0, VM_ALLOC_NORMAL |
VM_ALLOC_NOOBJ | VM_ALLOC_NODUMP | VM_ALLOC_WIRED);
if (pg == NULL) {
if (how == M_NOWAIT) {
m->m_epg_npgs = i;
m_free(m);
return (NULL);
}
vm_wait(NULL);
}
} while (pg == NULL);
m->m_epg_pa[i] = VM_PAGE_TO_PHYS(pg);
}
m->m_epg_npgs = npgs;
return (m);
}
/*
* Copy the data in the mbuf chain to a chain of mbufs with anonymous external
* unmapped pages.
* len is the length of data in the input mbuf chain.
* mlen is the maximum number of bytes put into each ext_page mbuf.
*/
struct mbuf *
mb_mapped_to_unmapped(struct mbuf *mp, int len, int mlen, int how,
struct mbuf **mlast)
{
struct mbuf *m, *mout;
char *pgpos, *mbpos;
int i, mblen, mbufsiz, pglen, xfer;
if (len == 0)
return (NULL);
mbufsiz = min(mlen, len);
m = mout = mb_alloc_ext_plus_pages(mbufsiz, how);
if (m == NULL)
return (m);
pgpos = (char *)(void *)PHYS_TO_DMAP(m->m_epg_pa[0]);
pglen = PAGE_SIZE;
mblen = 0;
i = 0;
do {
if (pglen == 0) {
if (++i == m->m_epg_npgs) {
m->m_epg_last_len = PAGE_SIZE;
mbufsiz = min(mlen, len);
m->m_next = mb_alloc_ext_plus_pages(mbufsiz,
how);
m = m->m_next;
if (m == NULL) {
m_freem(mout);
return (m);
}
i = 0;
}
pgpos = (char *)(void *)PHYS_TO_DMAP(m->m_epg_pa[i]);
pglen = PAGE_SIZE;
}
while (mblen == 0) {
if (mp == NULL) {
m_freem(mout);
return (NULL);
}
KASSERT((mp->m_flags & M_EXTPG) == 0,
("mb_copym_ext_pgs: ext_pgs input mbuf"));
mbpos = mtod(mp, char *);
mblen = mp->m_len;
mp = mp->m_next;
}
xfer = min(mblen, pglen);
memcpy(pgpos, mbpos, xfer);
pgpos += xfer;
mbpos += xfer;
pglen -= xfer;
mblen -= xfer;
len -= xfer;
m->m_len += xfer;
} while (len > 0);
m->m_epg_last_len = PAGE_SIZE - pglen;
if (mlast != NULL)
*mlast = m;
return (mout);
}
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