This makes it possible to perform mathematical operations on
fractional values without using floating point. It operates on Q
numbers, which are integer-sized, opaque structures initialized
to hold a chosen number of integer and fractional bits.
For a general description of the Q number system, see the "Fixed Point
Representation & Fractional Math" whitepaper[1]; for the actual
API see the qmath(3) man page.
This is one of dependencies for the upcoming stats(3) framework[2]
that will be applied to the TCP stack in a later commit.
1. https://www.superkits.net/whitepapers/Fixed%20Point%20Representation%20&%20Fractional%20Math.pdf
2. https://reviews.freebsd.org/D20477
Reviewed by: bcr (man pages, earlier version), sef (earlier version)
Discussed with: cem, dteske, imp, lstewart
Sponsored By: Klara Inc, Netflix
Obtained from: Netflix
Differential Revision: https://reviews.freebsd.org/D20116
This patch ensures only minimal level of compatibility necessary to boot
on RK3288 based boards. GPIO and pinctrl interaction, missing in current
implementation, will be improved by own patch in the near future.
MFC after: 2 weeks
MFC with: r351452
The function' interface assumes that the lower vnode is passed and
returned locked always.
Reported and tested by: pho
Sponsored by: The FreeBSD Foundation
MFC after: 1 week
Remove now-redundant items from toepcb and synq_entry and the code to
support them.
Let the driver calculate tx_align, rx_coalesce, and sndbuf by default.
Reviewed by: jhb@
MFC after: 1 week
Sponsored by: Chelsio Communications
Differential Revision: https://reviews.freebsd.org/D21387
descriptor. The per-tid tx credits are in demand during active Tx and
it's best not to use too many just for payload.
Sponsored by: Chelsio Communications
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
- Don't bother masking off non-queue state flags when loading the
page's atomic state, since it is only required for one of the
function's assertions. Update the assertion instead.
- Remove an incorrect comment regarding synchronization with the
page daemon. The page daemon only ever checks for PGA_ENQUEUED
with the page queue lock held.
- When clearing requeue flags, only clear the flags that have been
acted upon.
Reviewed by: kib (previous version)
Discussed with: alc
Tested by: pho (part of a larger patch)
MFC after: 1 week
Sponsored by: Netflix
Differential Revision: https://reviews.freebsd.org/D21368
According to ACPI 6.3 specification:
The OS sets this bit to 1 if it supports PCI Segment Groups as defined
by the _SEG object, and access to the configuration space of devices
in PCI Segment Groups as described by this specification. Otherwise,
the OS sets this bit to 0.
As far as I see we support both of those as PCI domains for quite a while.
MFC after: 2 months
According to my tests and errata to several generations of Intel CPUs,
PCIe hot-plug command completion reporting is not very reliable thing.
At least on my Supermicro X11DPi-NT board I never saw it reported.
Before this change timeout code detached devices and tried to disable
the slot, that in my case resulted in hot-plugged device being detached
just a second after it was successfully detected and attached. This
change removes that, so in case of timeout it just prints the error and
continue operation. Linux does the same.
MFC after: 1 week
Sponsored by: iXsystems, Inc.
This amounts to a char ** since it is a char[8] *. Evil casts mostly
resolved the fact that what was actually passed in were plain char *.
Instead, change the DES functions to use 'unsigned char *' for keys
and for input and output buffers.
Reviewed by: cem, imp
Sponsored by: Chelsio Communications
Differential Revision: https://reviews.freebsd.org/D21389
The following checks are now being enforced:
- bpbBytesPerSec: only accept 512, 1024, 2048 and 4096.
- bpbSecPerClust: only accept 1, 2, 4, 8, 16, 32, 64 and 128.
- bpbResSectors: require non-zero.
- bpbFATs: require non-zero.
- bpbSectors: require zero for FAT32.
- bpbFATsmall: require zero for FAT32.
- bpbHugeSectors: require non-zero for FAT32.
Bail out if the BPB contained values that do not meet these requirements.
We also require FATsecs * FATsecs to not overflow 32-bit unsigned
integer.
Check for backup boot block was removed because the checker does not take
corrective action, and msdosfs driver ignores it too.
The kernel thread stack zone performs first-touch allocations by
default, and must handle the case where the local memory domain
is empty. For most UMA zones this is handled in the keg layer,
but cache zones currently must implement a policy for this case.
Simply use a round-robin policy if UMA_ANYDOMAIN is passed.
Reported and tested by: bcran
Reviewed by: kib
Sponsored by: The FreeBSD Foundation
Use DOMAINSET_PREF() instead of DOMAINSET_FIXED(), to gracefully
fallback in case of memory-less domain.
Reported and tested by: bcran
Reviewed by: markj
Sponsored by: The FreeBSD Foundation
existing one.
Allocation failure is possible for instance when cpu domain has no memory.
Reported and tested by: bcran
Reviewed by: markj
Sponsored by: The FreeBSD Foundation
The netmap_pt.c module has become obsolete after
the refactoring that added netmap_kloop.c.
Remove it and unlink it from the build system.
MFC after: 1 week
Many arm kernel configs bogusly specified WERROR=-Werror. There's no
reason for this because the default is that and there's no reason to
override. These date from a time when we needed to add additional
warning->error suppression. They are obsolete and were cut and paste
propagated from file to file.
Comment out all the WERROR=.... lines in powerpc. They aren't bogus,
but were appropriate for the old defaults for gcc4.2.1. Now that we've
made the policy decision to suppress -Werror by default on these
platforms, it is appropriate to comment these out. People wishing to
fix these errors can still un-comment them out, or say WERROR=-Werror
on the command line.
Fix two instances (cut and paste propagation) of hard-coded -Werror
in x86 code. Replace with ${WERROR} instead. This is a no-op change
except for people who build WERROR=-Wno-error :).
This should fix tinderbox / CI breakage.
This patch fixes a bug that made the mixer command enter
an infinite loop when instructed to set the value of a device
to an empty string (e.g., `mixer vol ""`).
Additionally, some tests for mixer(8) are being added.
PR: 240039
Reviewed by: hselasky, mav
Approved by: src (hselasky, mav)
MFC after: 1 week
Differential Revision: https://reviews.freebsd.org/D21409
neighbors, and is used in a way so that if entries a and b cannot be
merged, we consider them twice, first not-merging a with its successor
b, and then not-merging b with its predecessor a. This change replaces
vm_map_simplify_entry with vm_map_try_merge_entries, which compares
two adjacent entries only, and uses it to avoid duplicated
merge-checks.
Tested by: pho
Reviewed by: alc
Approved by: markj (implicit)
Differential Revision: https://reviews.freebsd.org/D20814
Some places only take the interlock to hold the vnode, which was a requiremnt
before they started being manipulated with atomics. Use the newly introduced
vholdnz to bump the count.
Reviewed by: kib
Tested by: pho
Sponsored by: The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D21358
Motivated by the fact that I'm messing around near the implementation and
wanting to ensure this doesn't get messed up in the process.
MFC after: 1 week
Use CMSG_FIRSTHDR rather than assume that an array is correctly aligned.
Fixes warnings on sparc64 and powerpcspe.
Submitted by: Ján Sučan <sucanjan@gmail.com>
MFH: 2 weeks
Sponsored by: Google LLC (Google Summer of Code 2019)
Differential Revision: https://reviews.freebsd.org/D21406
Move pcpu KVA out of .bss into dynamically allocated VA at
pmap_bootstrap(). This avoids demoting superpage mapping .data/.bss.
Also it makes possible to use pmap_qenter() for installation of
domain-local pcpu page on NUMA configs.
Refactor pcpu and IST initialization by moving it to helper functions.
Reviewed by: markj
Tested by: pho
Discussed with: jeff
Sponsored by: The FreeBSD Foundation
Differential revision: https://reviews.freebsd.org/D21320
All these stacks are used only once (doublefault, boot) or very rare
(mce).
Reviewed by: markj
Tested by: pho
Sponsored by: The FreeBSD Foundation
Differential revision: https://reviews.freebsd.org/D21320
Store stack_guard_page * PAGE_SIZE into the gap->next_read field at
the time of the stack creation. This makes the used guard size
consistent between stack creation and stack grow time.
Suggested by: alc
Reviewed by: alc, markj
Sponsored by: The FreeBSD Foundation
MFC after: 1 week
Differential revision: https://reviews.freebsd.org/D21384
Failure test cases:
sys.netpfil.common.pass_block.pf_v6
sys.netpfil.pf.pass_block.noalias
sys.netpfil.pf.pass_block.v6
Sponsored by: The FreeBSD Foundation
