FreeBSD/Linux Kernel Cross Reference
sys/netinet/tcp_lro.h
1 /*-
2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
3 *
4 * Copyright (c) 2006, Myricom Inc.
5 * Copyright (c) 2008, Intel Corporation.
6 * Copyright (c) 2016 Mellanox Technologies.
7 * All rights reserved.
8 *
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
11 * are met:
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in the
16 * documentation and/or other materials provided with the distribution.
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
19 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
21 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
24 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
25 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
26 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
27 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
28 * SUCH DAMAGE.
29 *
30 * $FreeBSD: releng/12.0/sys/netinet/tcp_lro.h 326272 2017-11-27 15:23:17Z pfg $
31 */
32
33 #ifndef _TCP_LRO_H_
34 #define _TCP_LRO_H_
35
36 #include <sys/time.h>
37
38 #ifndef TCP_LRO_ENTRIES
39 /* Define default number of LRO entries per RX queue */
40 #define TCP_LRO_ENTRIES 8
41 #endif
42
43 struct lro_entry {
44 LIST_ENTRY(lro_entry) next;
45 LIST_ENTRY(lro_entry) hash_next;
46 struct mbuf *m_head;
47 struct mbuf *m_tail;
48 union {
49 struct ip *ip4;
50 struct ip6_hdr *ip6;
51 } leip;
52 union {
53 in_addr_t s_ip4;
54 struct in6_addr s_ip6;
55 } lesource;
56 union {
57 in_addr_t d_ip4;
58 struct in6_addr d_ip6;
59 } ledest;
60 uint16_t source_port;
61 uint16_t dest_port;
62 uint16_t eh_type; /* EthernetHeader type. */
63 uint16_t append_cnt;
64 uint32_t p_len; /* IP header payload length. */
65 uint32_t ulp_csum; /* TCP, etc. checksum. */
66 uint32_t next_seq; /* tcp_seq */
67 uint32_t ack_seq; /* tcp_seq */
68 uint32_t tsval;
69 uint32_t tsecr;
70 uint16_t window;
71 uint16_t timestamp; /* flag, not a TCP hdr field. */
72 struct timeval mtime;
73 };
74 LIST_HEAD(lro_head, lro_entry);
75
76 #define le_ip4 leip.ip4
77 #define le_ip6 leip.ip6
78 #define source_ip4 lesource.s_ip4
79 #define dest_ip4 ledest.d_ip4
80 #define source_ip6 lesource.s_ip6
81 #define dest_ip6 ledest.d_ip6
82
83 struct lro_mbuf_sort {
84 uint64_t seq;
85 struct mbuf *mb;
86 };
87
88 /* NB: This is part of driver structs. */
89 struct lro_ctrl {
90 struct ifnet *ifp;
91 struct lro_mbuf_sort *lro_mbuf_data;
92 uint64_t lro_queued;
93 uint64_t lro_flushed;
94 uint64_t lro_bad_csum;
95 unsigned lro_cnt;
96 unsigned lro_mbuf_count;
97 unsigned lro_mbuf_max;
98 unsigned short lro_ackcnt_lim; /* max # of aggregated ACKs */
99 unsigned lro_length_lim; /* max len of aggregated data */
100
101 u_long lro_hashsz;
102 struct lro_head *lro_hash;
103 struct lro_head lro_active;
104 struct lro_head lro_free;
105 };
106
107 #define TCP_LRO_LENGTH_MAX 65535
108 #define TCP_LRO_ACKCNT_MAX 65535 /* unlimited */
109
110 int tcp_lro_init(struct lro_ctrl *);
111 int tcp_lro_init_args(struct lro_ctrl *, struct ifnet *, unsigned, unsigned);
112 void tcp_lro_free(struct lro_ctrl *);
113 void tcp_lro_flush_inactive(struct lro_ctrl *, const struct timeval *);
114 void tcp_lro_flush(struct lro_ctrl *, struct lro_entry *);
115 void tcp_lro_flush_all(struct lro_ctrl *);
116 int tcp_lro_rx(struct lro_ctrl *, struct mbuf *, uint32_t);
117 void tcp_lro_queue_mbuf(struct lro_ctrl *, struct mbuf *);
118
119 #define TCP_LRO_NO_ENTRIES -2
120 #define TCP_LRO_CANNOT -1
121 #define TCP_LRO_NOT_SUPPORTED 1
122
123 #endif /* _TCP_LRO_H_ */
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