FreeBSD/Linux Kernel Cross Reference
sys/netinet/tcp_lro.h
1 /*-
2 * Copyright (c) 2006, Myricom Inc.
3 * Copyright (c) 2008, Intel Corporation.
4 * Copyright (c) 2016 Mellanox Technologies.
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 *
28 * $FreeBSD: releng/11.1/sys/netinet/tcp_lro.h 300731 2016-05-26 11:10:31Z hselasky $
29 */
30
31 #ifndef _TCP_LRO_H_
32 #define _TCP_LRO_H_
33
34 #include <sys/time.h>
35
36 #ifndef TCP_LRO_ENTRIES
37 /* Define default number of LRO entries per RX queue */
38 #define TCP_LRO_ENTRIES 8
39 #endif
40
41 struct lro_entry {
42 LIST_ENTRY(lro_entry) next;
43 struct mbuf *m_head;
44 struct mbuf *m_tail;
45 union {
46 struct ip *ip4;
47 struct ip6_hdr *ip6;
48 } leip;
49 union {
50 in_addr_t s_ip4;
51 struct in6_addr s_ip6;
52 } lesource;
53 union {
54 in_addr_t d_ip4;
55 struct in6_addr d_ip6;
56 } ledest;
57 uint16_t source_port;
58 uint16_t dest_port;
59 uint16_t eh_type; /* EthernetHeader type. */
60 uint16_t append_cnt;
61 uint32_t p_len; /* IP header payload length. */
62 uint32_t ulp_csum; /* TCP, etc. checksum. */
63 uint32_t next_seq; /* tcp_seq */
64 uint32_t ack_seq; /* tcp_seq */
65 uint32_t tsval;
66 uint32_t tsecr;
67 uint16_t window;
68 uint16_t timestamp; /* flag, not a TCP hdr field. */
69 struct timeval mtime;
70 };
71 LIST_HEAD(lro_head, lro_entry);
72
73 #define le_ip4 leip.ip4
74 #define le_ip6 leip.ip6
75 #define source_ip4 lesource.s_ip4
76 #define dest_ip4 ledest.d_ip4
77 #define source_ip6 lesource.s_ip6
78 #define dest_ip6 ledest.d_ip6
79
80 struct lro_mbuf_sort {
81 uint64_t seq;
82 struct mbuf *mb;
83 };
84
85 /* NB: This is part of driver structs. */
86 struct lro_ctrl {
87 struct ifnet *ifp;
88 struct lro_mbuf_sort *lro_mbuf_data;
89 uint64_t lro_queued;
90 uint64_t lro_flushed;
91 uint64_t lro_bad_csum;
92 unsigned lro_cnt;
93 unsigned lro_mbuf_count;
94 unsigned lro_mbuf_max;
95 unsigned short lro_ackcnt_lim; /* max # of aggregated ACKs */
96 unsigned lro_length_lim; /* max len of aggregated data */
97
98 struct lro_head lro_active;
99 struct lro_head lro_free;
100 };
101
102 #define TCP_LRO_LENGTH_MAX 65535
103 #define TCP_LRO_ACKCNT_MAX 65535 /* unlimited */
104
105 int tcp_lro_init(struct lro_ctrl *);
106 int tcp_lro_init_args(struct lro_ctrl *, struct ifnet *, unsigned, unsigned);
107 void tcp_lro_free(struct lro_ctrl *);
108 void tcp_lro_flush_inactive(struct lro_ctrl *, const struct timeval *);
109 void tcp_lro_flush(struct lro_ctrl *, struct lro_entry *);
110 void tcp_lro_flush_all(struct lro_ctrl *);
111 int tcp_lro_rx(struct lro_ctrl *, struct mbuf *, uint32_t);
112 void tcp_lro_queue_mbuf(struct lro_ctrl *, struct mbuf *);
113
114 #define TCP_LRO_NO_ENTRIES -2
115 #define TCP_LRO_CANNOT -1
116 #define TCP_LRO_NOT_SUPPORTED 1
117
118 #endif /* _TCP_LRO_H_ */
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