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freebsd-dev/sys/netinet/tcp_lro.h

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Switch to a standard 2 clause BSD license (from bsd-style-copyright). Approved by: Myricom Inc. (gallatin) Approved by: Intel Corporation (jfv)
2012-05-15 13:23:44 +00:00
/*-
sys: general 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. No functional change intended.
2017-11-27 15:23:17 +00:00
* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
*
Switch to a standard 2 clause BSD license (from bsd-style-copyright). Approved by: Myricom Inc. (gallatin) Approved by: Intel Corporation (jfv)
2012-05-15 13:23:44 +00:00
* Copyright (c) 2006, Myricom Inc.
* Copyright (c) 2008, Intel Corporation.
Add optimizing LRO wrapper: - Add optimizing LRO wrapper which pre-sorts all incoming packets according to the hash type and flowid. This prevents exhaustion of the LRO entries due to too many connections at the same time. Testing using a larger number of higher bandwidth TCP connections showed that the incoming ACK packet aggregation rate increased from ~1.3:1 to almost 3:1. Another test showed that for a number of TCP connections greater than 16 per hardware receive ring, where 8 TCP connections was the LRO active entry limit, there was a significant improvement in throughput due to being able to fully aggregate more than 8 TCP stream. For very few very high bandwidth TCP streams, the optimizing LRO wrapper will add CPU usage instead of reducing CPU usage. This is expected. Network drivers which want to use the optimizing LRO wrapper needs to call "tcp_lro_queue_mbuf()" instead of "tcp_lro_rx()" and "tcp_lro_flush_all()" instead of "tcp_lro_flush()". Further the LRO control structure must be initialized using "tcp_lro_init_args()" passing a non-zero number into the "lro_mbufs" argument. - Make LRO statistics 64-bit. Previously 32-bit integers were used for statistics which can be prone to wrap-around. Fix this while at it and update all SYSCTL's which expose LRO statistics. - Ensure all data is freed when destroying a LRO control structures, especially leftover LRO entries. - Reduce number of memory allocations needed when setting up a LRO control structure by precomputing the total amount of memory needed. - Add own memory allocation counter for LRO. - Bump the FreeBSD version to force recompilation of all KLDs due to change of the LRO control structure size. Sponsored by: Mellanox Technologies Reviewed by: gallatin, sbruno, rrs, gnn, transport Tested by: Netflix Differential Revision: https://reviews.freebsd.org/D4914
2016-01-19 15:33:28 +00:00
* Copyright (c) 2016 Mellanox Technologies.
Switch to a standard 2 clause BSD license (from bsd-style-copyright). Approved by: Myricom Inc. (gallatin) Approved by: Intel Corporation (jfv)
2012-05-15 13:23:44 +00:00
* All rights reserved.
*
* 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, 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.
*
* $FreeBSD$
*/
Add generic TCP LOR into netinet
2008-06-11 22:12:50 +00:00
#ifndef _TCP_LRO_H_
#define _TCP_LRO_H_
Merge r254336 from user/np/cxl_tuning. Add a last-modified timestamp to each LRO entry and provide an interface to flush all inactive entries. Drivers decide when to flush and what the inactivity threshold should be. Network drivers that process an rx queue to completion can enter a livelock type situation when the rate at which packets are received reaches equilibrium with the rate at which the rx thread is processing them. When this happens the final LRO flush (normally when the rx routine is done) does not occur. Pure ACKs and segments with total payload < 64K can get stuck in an LRO entry. Symptoms are that TCP tx-mostly connections' performance falls off a cliff during heavy, unrelated rx on the interface. Flushing only inactive LRO entries works better than any of these alternates that I tried: - don't LRO pure ACKs - flush _all_ LRO entries periodically (every 'x' microseconds or every 'y' descriptors) - stop rx processing in the driver periodically and schedule remaining work for later. Reviewed by: andre
2013-08-28 23:00:34 +00:00
#include <sys/time.h>
Add optimizing LRO wrapper: - Add optimizing LRO wrapper which pre-sorts all incoming packets according to the hash type and flowid. This prevents exhaustion of the LRO entries due to too many connections at the same time. Testing using a larger number of higher bandwidth TCP connections showed that the incoming ACK packet aggregation rate increased from ~1.3:1 to almost 3:1. Another test showed that for a number of TCP connections greater than 16 per hardware receive ring, where 8 TCP connections was the LRO active entry limit, there was a significant improvement in throughput due to being able to fully aggregate more than 8 TCP stream. For very few very high bandwidth TCP streams, the optimizing LRO wrapper will add CPU usage instead of reducing CPU usage. This is expected. Network drivers which want to use the optimizing LRO wrapper needs to call "tcp_lro_queue_mbuf()" instead of "tcp_lro_rx()" and "tcp_lro_flush_all()" instead of "tcp_lro_flush()". Further the LRO control structure must be initialized using "tcp_lro_init_args()" passing a non-zero number into the "lro_mbufs" argument. - Make LRO statistics 64-bit. Previously 32-bit integers were used for statistics which can be prone to wrap-around. Fix this while at it and update all SYSCTL's which expose LRO statistics. - Ensure all data is freed when destroying a LRO control structures, especially leftover LRO entries. - Reduce number of memory allocations needed when setting up a LRO control structure by precomputing the total amount of memory needed. - Add own memory allocation counter for LRO. - Bump the FreeBSD version to force recompilation of all KLDs due to change of the LRO control structure size. Sponsored by: Mellanox Technologies Reviewed by: gallatin, sbruno, rrs, gnn, transport Tested by: Netflix Differential Revision: https://reviews.freebsd.org/D4914
2016-01-19 15:33:28 +00:00
#ifndef TCP_LRO_ENTRIES
/* Define default number of LRO entries per RX queue */
#define TCP_LRO_ENTRIES 8
#endif
tcp/lro: Change SLIST to LIST, so that removing an entry is O(1) This is kinda critical to the performance when the CPU is slow and network bandwidth is high, e.g. in the hypervisor. Reviewed by: rrs, gallatin, Dexuan Cui <decui microsoft com> Sponsored by: Microsoft OSTC Differential Revision: https://reviews.freebsd.org/D5765
2016-04-01 06:43:05 +00:00
struct lro_entry {
LIST_ENTRY(lro_entry) next;
tcp/lro: Implement hash table for LRO entries. This significantly improves HTTP workload performance and reduces HTTP workload latency. Reviewed by: rrs, gallatin, hps Obtained from: rrs, gallatin Sponsored by: Netflix (rrs, gallatin) , Microsoft (sephe) Differential Revision: https://reviews.freebsd.org/D6689
2016-08-02 06:36:47 +00:00
LIST_ENTRY(lro_entry) hash_next;
MFp4 bz_ipv6_fast: Significantly update tcp_lro for mostly two things: 1) introduce basic support for IPv6 without extension headers. 2) try hard to also get the incremental checksum updates right, especially also in the IPv4 case for the IP and TCP header. Move variables around for better locality, factor things out into functions, allow checksum updates to be compiled out, ... Leave a few comments on further things to look at in the future, though that is not the full list. Update drivers with appropriate #includes as needed for IPv6 data type in LRO. Sponsored by: The FreeBSD Foundation Sponsored by: iXsystems Reviewed by: gnn (as part of the whole) MFC After: 3 days
2012-05-24 23:03:23 +00:00
struct mbuf *m_head;
struct mbuf *m_tail;
union {
struct ip *ip4;
struct ip6_hdr *ip6;
} leip;
union {
in_addr_t s_ip4;
struct in6_addr s_ip6;
} lesource;
union {
in_addr_t d_ip4;
struct in6_addr d_ip6;
} ledest;
uint16_t source_port;
uint16_t dest_port;
uint16_t eh_type; /* EthernetHeader type. */
uint16_t append_cnt;
uint32_t p_len; /* IP header payload length. */
uint32_t ulp_csum; /* TCP, etc. checksum. */
uint32_t next_seq; /* tcp_seq */
uint32_t ack_seq; /* tcp_seq */
uint32_t tsval;
uint32_t tsecr;
uint16_t window;
uint16_t timestamp; /* flag, not a TCP hdr field. */
Merge r254336 from user/np/cxl_tuning. Add a last-modified timestamp to each LRO entry and provide an interface to flush all inactive entries. Drivers decide when to flush and what the inactivity threshold should be. Network drivers that process an rx queue to completion can enter a livelock type situation when the rate at which packets are received reaches equilibrium with the rate at which the rx thread is processing them. When this happens the final LRO flush (normally when the rx routine is done) does not occur. Pure ACKs and segments with total payload < 64K can get stuck in an LRO entry. Symptoms are that TCP tx-mostly connections' performance falls off a cliff during heavy, unrelated rx on the interface. Flushing only inactive LRO entries works better than any of these alternates that I tried: - don't LRO pure ACKs - flush _all_ LRO entries periodically (every 'x' microseconds or every 'y' descriptors) - stop rx processing in the driver periodically and schedule remaining work for later. Reviewed by: andre
2013-08-28 23:00:34 +00:00
struct timeval mtime;
Add generic TCP LOR into netinet
2008-06-11 22:12:50 +00:00
};
tcp/lro: Change SLIST to LIST, so that removing an entry is O(1) This is kinda critical to the performance when the CPU is slow and network bandwidth is high, e.g. in the hypervisor. Reviewed by: rrs, gallatin, Dexuan Cui <decui microsoft com> Sponsored by: Microsoft OSTC Differential Revision: https://reviews.freebsd.org/D5765
2016-04-01 06:43:05 +00:00
LIST_HEAD(lro_head, lro_entry);
Add generic TCP LOR into netinet
2008-06-11 22:12:50 +00:00
MFp4 bz_ipv6_fast: Significantly update tcp_lro for mostly two things: 1) introduce basic support for IPv6 without extension headers. 2) try hard to also get the incremental checksum updates right, especially also in the IPv4 case for the IP and TCP header. Move variables around for better locality, factor things out into functions, allow checksum updates to be compiled out, ... Leave a few comments on further things to look at in the future, though that is not the full list. Update drivers with appropriate #includes as needed for IPv6 data type in LRO. Sponsored by: The FreeBSD Foundation Sponsored by: iXsystems Reviewed by: gnn (as part of the whole) MFC After: 3 days
2012-05-24 23:03:23 +00:00
#define le_ip4 leip.ip4
#define le_ip6 leip.ip6
#define source_ip4 lesource.s_ip4
#define dest_ip4 ledest.d_ip4
#define source_ip6 lesource.s_ip6
#define dest_ip6 ledest.d_ip6
Use optimised complexity safe sorting routine instead of the kernel's "qsort()". The kernel's "qsort()" routine can in worst case spend O(N*N) amount of comparisons before the input array is sorted. It can also recurse a significant amount of times using up the kernel's interrupt thread stack. The custom sorting routine takes advantage of that the sorting key is only 64 bits. Based on set and cleared bits in the sorting key it partitions the array until it is sorted. This process has a recursion limit of 64 times, due to the number of set and cleared bits which can occur. Compiled with -O2 the sorting routine was measured to use 64-bytes of stack. Multiplying this by 64 gives a maximum stack consumption of 4096 bytes for AMD64. The same applies to the execution time, that the array to be sorted will not be traversed more than 64 times. When serving roughly 80Gb/s with 80K TCP connections, the old method consisting of "qsort()" and "tcp_lro_mbuf_compare_header()" used 1.4% CPU, while the new "tcp_lro_sort()" used 1.1% for LRO related sorting as measured by Intel Vtune. The testing was done using a sysctl to toggle between "qsort()" and "tcp_lro_sort()". Differential Revision: https://reviews.freebsd.org/D6472 Sponsored by: Mellanox Technologies Tested by: Netflix Reviewed by: gallatin, rrs, sephe, transport
2016-05-26 11:10:31 +00:00
struct lro_mbuf_sort {
uint64_t seq;
struct mbuf *mb;
};
MFp4 bz_ipv6_fast: Significantly update tcp_lro for mostly two things: 1) introduce basic support for IPv6 without extension headers. 2) try hard to also get the incremental checksum updates right, especially also in the IPv4 case for the IP and TCP header. Move variables around for better locality, factor things out into functions, allow checksum updates to be compiled out, ... Leave a few comments on further things to look at in the future, though that is not the full list. Update drivers with appropriate #includes as needed for IPv6 data type in LRO. Sponsored by: The FreeBSD Foundation Sponsored by: iXsystems Reviewed by: gnn (as part of the whole) MFC After: 3 days
2012-05-24 23:03:23 +00:00
/* NB: This is part of driver structs. */
Add generic TCP LOR into netinet
2008-06-11 22:12:50 +00:00
struct lro_ctrl {
struct ifnet *ifp;
Use optimised complexity safe sorting routine instead of the kernel's "qsort()". The kernel's "qsort()" routine can in worst case spend O(N*N) amount of comparisons before the input array is sorted. It can also recurse a significant amount of times using up the kernel's interrupt thread stack. The custom sorting routine takes advantage of that the sorting key is only 64 bits. Based on set and cleared bits in the sorting key it partitions the array until it is sorted. This process has a recursion limit of 64 times, due to the number of set and cleared bits which can occur. Compiled with -O2 the sorting routine was measured to use 64-bytes of stack. Multiplying this by 64 gives a maximum stack consumption of 4096 bytes for AMD64. The same applies to the execution time, that the array to be sorted will not be traversed more than 64 times. When serving roughly 80Gb/s with 80K TCP connections, the old method consisting of "qsort()" and "tcp_lro_mbuf_compare_header()" used 1.4% CPU, while the new "tcp_lro_sort()" used 1.1% for LRO related sorting as measured by Intel Vtune. The testing was done using a sysctl to toggle between "qsort()" and "tcp_lro_sort()". Differential Revision: https://reviews.freebsd.org/D6472 Sponsored by: Mellanox Technologies Tested by: Netflix Reviewed by: gallatin, rrs, sephe, transport
2016-05-26 11:10:31 +00:00
struct lro_mbuf_sort *lro_mbuf_data;
Add optimizing LRO wrapper: - Add optimizing LRO wrapper which pre-sorts all incoming packets according to the hash type and flowid. This prevents exhaustion of the LRO entries due to too many connections at the same time. Testing using a larger number of higher bandwidth TCP connections showed that the incoming ACK packet aggregation rate increased from ~1.3:1 to almost 3:1. Another test showed that for a number of TCP connections greater than 16 per hardware receive ring, where 8 TCP connections was the LRO active entry limit, there was a significant improvement in throughput due to being able to fully aggregate more than 8 TCP stream. For very few very high bandwidth TCP streams, the optimizing LRO wrapper will add CPU usage instead of reducing CPU usage. This is expected. Network drivers which want to use the optimizing LRO wrapper needs to call "tcp_lro_queue_mbuf()" instead of "tcp_lro_rx()" and "tcp_lro_flush_all()" instead of "tcp_lro_flush()". Further the LRO control structure must be initialized using "tcp_lro_init_args()" passing a non-zero number into the "lro_mbufs" argument. - Make LRO statistics 64-bit. Previously 32-bit integers were used for statistics which can be prone to wrap-around. Fix this while at it and update all SYSCTL's which expose LRO statistics. - Ensure all data is freed when destroying a LRO control structures, especially leftover LRO entries. - Reduce number of memory allocations needed when setting up a LRO control structure by precomputing the total amount of memory needed. - Add own memory allocation counter for LRO. - Bump the FreeBSD version to force recompilation of all KLDs due to change of the LRO control structure size. Sponsored by: Mellanox Technologies Reviewed by: gallatin, sbruno, rrs, gnn, transport Tested by: Netflix Differential Revision: https://reviews.freebsd.org/D4914
2016-01-19 15:33:28 +00:00
uint64_t lro_queued;
uint64_t lro_flushed;
uint64_t lro_bad_csum;
unsigned lro_cnt;
unsigned lro_mbuf_count;
unsigned lro_mbuf_max;
tcp/lro: Allow drivers to set the TCP ACK/data segment aggregation limit ACK aggregation limit is append count based, while the TCP data segment aggregation limit is length based. Unless the network driver sets these two limits, it's an NO-OP. Reviewed by: adrian, gallatin (previous version), hselasky (previous version) Approved by: adrian (mentor) MFC after: 1 week Sponsored by: Microsoft OSTC Differential Revision: https://reviews.freebsd.org/D5185
2016-02-18 04:58:34 +00:00
unsigned short lro_ackcnt_lim; /* max # of aggregated ACKs */
unsigned lro_length_lim; /* max len of aggregated data */
Add generic TCP LOR into netinet
2008-06-11 22:12:50 +00:00
tcp/lro: Implement hash table for LRO entries. This significantly improves HTTP workload performance and reduces HTTP workload latency. Reviewed by: rrs, gallatin, hps Obtained from: rrs, gallatin Sponsored by: Netflix (rrs, gallatin) , Microsoft (sephe) Differential Revision: https://reviews.freebsd.org/D6689
2016-08-02 06:36:47 +00:00
u_long lro_hashsz;
struct lro_head *lro_hash;
Add generic TCP LOR into netinet
2008-06-11 22:12:50 +00:00
struct lro_head lro_active;
struct lro_head lro_free;
};
tcp/lro: Allow drivers to set the TCP ACK/data segment aggregation limit ACK aggregation limit is append count based, while the TCP data segment aggregation limit is length based. Unless the network driver sets these two limits, it's an NO-OP. Reviewed by: adrian, gallatin (previous version), hselasky (previous version) Approved by: adrian (mentor) MFC after: 1 week Sponsored by: Microsoft OSTC Differential Revision: https://reviews.freebsd.org/D5185
2016-02-18 04:58:34 +00:00
#define TCP_LRO_LENGTH_MAX 65535
#define TCP_LRO_ACKCNT_MAX 65535 /* unlimited */
Add generic TCP LOR into netinet
2008-06-11 22:12:50 +00:00
int tcp_lro_init(struct lro_ctrl *);
Add optimizing LRO wrapper: - Add optimizing LRO wrapper which pre-sorts all incoming packets according to the hash type and flowid. This prevents exhaustion of the LRO entries due to too many connections at the same time. Testing using a larger number of higher bandwidth TCP connections showed that the incoming ACK packet aggregation rate increased from ~1.3:1 to almost 3:1. Another test showed that for a number of TCP connections greater than 16 per hardware receive ring, where 8 TCP connections was the LRO active entry limit, there was a significant improvement in throughput due to being able to fully aggregate more than 8 TCP stream. For very few very high bandwidth TCP streams, the optimizing LRO wrapper will add CPU usage instead of reducing CPU usage. This is expected. Network drivers which want to use the optimizing LRO wrapper needs to call "tcp_lro_queue_mbuf()" instead of "tcp_lro_rx()" and "tcp_lro_flush_all()" instead of "tcp_lro_flush()". Further the LRO control structure must be initialized using "tcp_lro_init_args()" passing a non-zero number into the "lro_mbufs" argument. - Make LRO statistics 64-bit. Previously 32-bit integers were used for statistics which can be prone to wrap-around. Fix this while at it and update all SYSCTL's which expose LRO statistics. - Ensure all data is freed when destroying a LRO control structures, especially leftover LRO entries. - Reduce number of memory allocations needed when setting up a LRO control structure by precomputing the total amount of memory needed. - Add own memory allocation counter for LRO. - Bump the FreeBSD version to force recompilation of all KLDs due to change of the LRO control structure size. Sponsored by: Mellanox Technologies Reviewed by: gallatin, sbruno, rrs, gnn, transport Tested by: Netflix Differential Revision: https://reviews.freebsd.org/D4914
2016-01-19 15:33:28 +00:00
int tcp_lro_init_args(struct lro_ctrl *, struct ifnet *, unsigned, unsigned);
Add generic TCP LOR into netinet
2008-06-11 22:12:50 +00:00
void tcp_lro_free(struct lro_ctrl *);
Merge r254336 from user/np/cxl_tuning. Add a last-modified timestamp to each LRO entry and provide an interface to flush all inactive entries. Drivers decide when to flush and what the inactivity threshold should be. Network drivers that process an rx queue to completion can enter a livelock type situation when the rate at which packets are received reaches equilibrium with the rate at which the rx thread is processing them. When this happens the final LRO flush (normally when the rx routine is done) does not occur. Pure ACKs and segments with total payload < 64K can get stuck in an LRO entry. Symptoms are that TCP tx-mostly connections' performance falls off a cliff during heavy, unrelated rx on the interface. Flushing only inactive LRO entries works better than any of these alternates that I tried: - don't LRO pure ACKs - flush _all_ LRO entries periodically (every 'x' microseconds or every 'y' descriptors) - stop rx processing in the driver periodically and schedule remaining work for later. Reviewed by: andre
2013-08-28 23:00:34 +00:00
void tcp_lro_flush_inactive(struct lro_ctrl *, const struct timeval *);
Add generic TCP LOR into netinet
2008-06-11 22:12:50 +00:00
void tcp_lro_flush(struct lro_ctrl *, struct lro_entry *);
Add optimizing LRO wrapper: - Add optimizing LRO wrapper which pre-sorts all incoming packets according to the hash type and flowid. This prevents exhaustion of the LRO entries due to too many connections at the same time. Testing using a larger number of higher bandwidth TCP connections showed that the incoming ACK packet aggregation rate increased from ~1.3:1 to almost 3:1. Another test showed that for a number of TCP connections greater than 16 per hardware receive ring, where 8 TCP connections was the LRO active entry limit, there was a significant improvement in throughput due to being able to fully aggregate more than 8 TCP stream. For very few very high bandwidth TCP streams, the optimizing LRO wrapper will add CPU usage instead of reducing CPU usage. This is expected. Network drivers which want to use the optimizing LRO wrapper needs to call "tcp_lro_queue_mbuf()" instead of "tcp_lro_rx()" and "tcp_lro_flush_all()" instead of "tcp_lro_flush()". Further the LRO control structure must be initialized using "tcp_lro_init_args()" passing a non-zero number into the "lro_mbufs" argument. - Make LRO statistics 64-bit. Previously 32-bit integers were used for statistics which can be prone to wrap-around. Fix this while at it and update all SYSCTL's which expose LRO statistics. - Ensure all data is freed when destroying a LRO control structures, especially leftover LRO entries. - Reduce number of memory allocations needed when setting up a LRO control structure by precomputing the total amount of memory needed. - Add own memory allocation counter for LRO. - Bump the FreeBSD version to force recompilation of all KLDs due to change of the LRO control structure size. Sponsored by: Mellanox Technologies Reviewed by: gallatin, sbruno, rrs, gnn, transport Tested by: Netflix Differential Revision: https://reviews.freebsd.org/D4914
2016-01-19 15:33:28 +00:00
void tcp_lro_flush_all(struct lro_ctrl *);
Add generic TCP LOR into netinet
2008-06-11 22:12:50 +00:00
int tcp_lro_rx(struct lro_ctrl *, struct mbuf *, uint32_t);
Add optimizing LRO wrapper: - Add optimizing LRO wrapper which pre-sorts all incoming packets according to the hash type and flowid. This prevents exhaustion of the LRO entries due to too many connections at the same time. Testing using a larger number of higher bandwidth TCP connections showed that the incoming ACK packet aggregation rate increased from ~1.3:1 to almost 3:1. Another test showed that for a number of TCP connections greater than 16 per hardware receive ring, where 8 TCP connections was the LRO active entry limit, there was a significant improvement in throughput due to being able to fully aggregate more than 8 TCP stream. For very few very high bandwidth TCP streams, the optimizing LRO wrapper will add CPU usage instead of reducing CPU usage. This is expected. Network drivers which want to use the optimizing LRO wrapper needs to call "tcp_lro_queue_mbuf()" instead of "tcp_lro_rx()" and "tcp_lro_flush_all()" instead of "tcp_lro_flush()". Further the LRO control structure must be initialized using "tcp_lro_init_args()" passing a non-zero number into the "lro_mbufs" argument. - Make LRO statistics 64-bit. Previously 32-bit integers were used for statistics which can be prone to wrap-around. Fix this while at it and update all SYSCTL's which expose LRO statistics. - Ensure all data is freed when destroying a LRO control structures, especially leftover LRO entries. - Reduce number of memory allocations needed when setting up a LRO control structure by precomputing the total amount of memory needed. - Add own memory allocation counter for LRO. - Bump the FreeBSD version to force recompilation of all KLDs due to change of the LRO control structure size. Sponsored by: Mellanox Technologies Reviewed by: gallatin, sbruno, rrs, gnn, transport Tested by: Netflix Differential Revision: https://reviews.freebsd.org/D4914
2016-01-19 15:33:28 +00:00
void tcp_lro_queue_mbuf(struct lro_ctrl *, struct mbuf *);
Add generic TCP LOR into netinet
2008-06-11 22:12:50 +00:00
tcp/lro: Return TCP_LRO_NO_ENTRIES if we are short of LRO entries. So that callers could react accordingly. Reviewed by: gallatin (no objection) MFC after: 1 week Sponsored by: Microsoft OSTC Differential Revision: https://reviews.freebsd.org/D5695
2016-03-25 02:54:13 +00:00
#define TCP_LRO_NO_ENTRIES -2
MFp4 bz_ipv6_fast: Significantly update tcp_lro for mostly two things: 1) introduce basic support for IPv6 without extension headers. 2) try hard to also get the incremental checksum updates right, especially also in the IPv4 case for the IP and TCP header. Move variables around for better locality, factor things out into functions, allow checksum updates to be compiled out, ... Leave a few comments on further things to look at in the future, though that is not the full list. Update drivers with appropriate #includes as needed for IPv6 data type in LRO. Sponsored by: The FreeBSD Foundation Sponsored by: iXsystems Reviewed by: gnn (as part of the whole) MFC After: 3 days
2012-05-24 23:03:23 +00:00
#define TCP_LRO_CANNOT -1
#define TCP_LRO_NOT_SUPPORTED 1
Add generic TCP LOR into netinet
2008-06-11 22:12:50 +00:00
#endif /* _TCP_LRO_H_ */
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