e0d8add4af
Make sure the size of the raw[] array in the lro_address union is correctly set at compile time, so that static code analysis tools do not report undefined behaviour. MFC after: 1 week Sponsored by: NVIDIA Networking
221 lines
6.9 KiB
C
221 lines
6.9 KiB
C
/*-
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* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
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*
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* Copyright (c) 2006, Myricom Inc.
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* Copyright (c) 2008, Intel Corporation.
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* Copyright (c) 2016-2021 Mellanox Technologies.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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#ifndef _TCP_LRO_H_
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#define _TCP_LRO_H_
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#include <sys/time.h>
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#include <sys/param.h>
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#include <netinet/in.h>
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#ifndef TCP_LRO_ENTRIES
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/* Define default number of LRO entries per RX queue */
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#define TCP_LRO_ENTRIES 8
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#endif
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/*
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* Flags for ACK entry for compression
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* the bottom 12 bits has the th_x2|th_flags.
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* LRO itself adds only the TSTMP flags
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* to indicate if either of the types
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* of timestamps are filled and the
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* HAS_TSTMP option to indicate if the
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* TCP timestamp option is valid.
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*
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* The other 1 flag bits are for processing
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* by a stack.
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*
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*/
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#define TSTMP_LRO 0x1000
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#define TSTMP_HDWR 0x2000
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#define HAS_TSTMP 0x4000
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/*
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* Default number of interrupts on the same cpu in a row
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* that will cause us to declare a "affinity cpu".
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*/
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#define TCP_LRO_CPU_DECLARATION_THRESH 50
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struct inpcb;
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/* Precompute the LRO_RAW_ADDRESS_MAX value: */
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#define LRO_RAW_ADDRESS_MAX \
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howmany(12 + 2 * sizeof(struct in6_addr), sizeof(u_long))
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union lro_address {
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u_long raw[LRO_RAW_ADDRESS_MAX];
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struct {
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uint8_t lro_type; /* internal */
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#define LRO_TYPE_NONE 0
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#define LRO_TYPE_IPV4_TCP 1
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#define LRO_TYPE_IPV6_TCP 2
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#define LRO_TYPE_IPV4_UDP 3
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#define LRO_TYPE_IPV6_UDP 4
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uint8_t lro_flags;
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#define LRO_FLAG_DECRYPTED 1
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uint16_t vlan_id; /* VLAN identifier */
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uint16_t s_port; /* source TCP/UDP port */
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uint16_t d_port; /* destination TCP/UDP port */
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uint32_t vxlan_vni; /* VXLAN virtual network identifier */
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union {
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struct in_addr v4;
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struct in6_addr v6;
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} s_addr; /* source IPv4/IPv6 address */
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union {
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struct in_addr v4;
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struct in6_addr v6;
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} d_addr; /* destination IPv4/IPv6 address */
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};
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};
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_Static_assert(sizeof(union lro_address) == sizeof(u_long) * LRO_RAW_ADDRESS_MAX,
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"The raw field in the lro_address union does not cover the whole structure.");
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/* Optimize address comparison by comparing one unsigned long at a time: */
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static inline bool
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lro_address_compare(const union lro_address *pa, const union lro_address *pb)
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{
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if (pa->lro_type == LRO_TYPE_NONE && pb->lro_type == LRO_TYPE_NONE) {
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return (true);
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} else for (unsigned i = 0; i < LRO_RAW_ADDRESS_MAX; i++) {
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if (pa->raw[i] != pb->raw[i])
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return (false);
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}
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return (true);
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}
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struct lro_parser {
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union lro_address data;
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union {
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uint8_t *l3;
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struct ip *ip4;
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struct ip6_hdr *ip6;
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};
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union {
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uint8_t *l4;
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struct tcphdr *tcp;
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struct udphdr *udp;
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};
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uint16_t total_hdr_len;
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};
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/* This structure is zeroed frequently, try to keep it small. */
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struct lro_entry {
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LIST_ENTRY(lro_entry) next;
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LIST_ENTRY(lro_entry) hash_next;
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struct mbuf *m_head;
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struct mbuf *m_tail;
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struct mbuf *m_last_mbuf;
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struct lro_parser outer;
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struct lro_parser inner;
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uint32_t next_seq; /* tcp_seq */
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uint32_t ack_seq; /* tcp_seq */
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uint32_t tsval;
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uint32_t tsecr;
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uint16_t compressed;
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uint16_t uncompressed;
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uint16_t window;
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uint16_t flags : 12, /* 12 TCP header bits */
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timestamp : 1,
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needs_merge : 1,
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reserved : 2; /* unused */
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struct bintime alloc_time; /* time when entry was allocated */
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};
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LIST_HEAD(lro_head, lro_entry);
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struct lro_mbuf_sort {
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uint64_t seq;
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struct mbuf *mb;
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};
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/* NB: This is part of driver structs. */
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struct lro_ctrl {
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struct ifnet *ifp;
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struct lro_mbuf_sort *lro_mbuf_data;
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struct bintime lro_last_queue_time; /* last time data was queued */
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uint64_t lro_queued;
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uint64_t lro_flushed;
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uint64_t lro_bad_csum;
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unsigned lro_cnt;
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unsigned lro_mbuf_count;
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unsigned lro_mbuf_max;
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unsigned short lro_ackcnt_lim; /* max # of aggregated ACKs */
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unsigned short lro_cpu; /* Guess at the cpu we have affinity too */
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unsigned lro_length_lim; /* max len of aggregated data */
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u_long lro_hashsz;
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uint32_t lro_last_cpu;
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uint32_t lro_cnt_of_same_cpu;
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struct lro_head *lro_hash;
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struct lro_head lro_active;
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struct lro_head lro_free;
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uint8_t lro_cpu_is_set; /* Flag to say its ok to set the CPU on the inp */
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};
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struct tcp_ackent {
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uint64_t timestamp; /* hardware or sofware timestamp, valid if TSTMP_LRO or TSTMP_HDRW set */
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uint32_t seq; /* th_seq value */
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uint32_t ack; /* th_ack value */
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uint32_t ts_value; /* If ts option value, valid if HAS_TSTMP is set */
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uint32_t ts_echo; /* If ts option echo, valid if HAS_TSTMP is set */
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uint16_t win; /* TCP window */
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uint16_t flags; /* Flags to say if TS is present and type of timestamp and th_flags */
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uint8_t codepoint; /* IP level codepoint including ECN bits */
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uint8_t ack_val_set; /* Classification of ack used by the stack */
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uint8_t pad[2]; /* To 32 byte boundary */
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};
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/* We use two M_PROTO on the mbuf */
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#define M_ACKCMP M_PROTO4 /* Indicates LRO is sending in a Ack-compression mbuf */
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#define M_LRO_EHDRSTRP M_PROTO6 /* Indicates that LRO has stripped the etherenet header */
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#define TCP_LRO_LENGTH_MAX (65535 - 255) /* safe value with room for outer headers */
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#define TCP_LRO_ACKCNT_MAX 65535 /* unlimited */
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int tcp_lro_init(struct lro_ctrl *);
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int tcp_lro_init_args(struct lro_ctrl *, struct ifnet *, unsigned, unsigned);
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void tcp_lro_free(struct lro_ctrl *);
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void tcp_lro_flush_inactive(struct lro_ctrl *, const struct timeval *);
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void tcp_lro_flush(struct lro_ctrl *, struct lro_entry *);
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void tcp_lro_flush_all(struct lro_ctrl *);
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int tcp_lro_rx(struct lro_ctrl *, struct mbuf *, uint32_t);
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void tcp_lro_queue_mbuf(struct lro_ctrl *, struct mbuf *);
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void tcp_lro_reg_mbufq(void);
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void tcp_lro_dereg_mbufq(void);
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#define TCP_LRO_NO_ENTRIES -2
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#define TCP_LRO_CANNOT -1
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#define TCP_LRO_NOT_SUPPORTED 1
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#endif /* _TCP_LRO_H_ */
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