tcp_lro.h revision 179737 
1/*******************************************************************************
2
3Copyright (c) 2006, Myricom Inc.
4Copyright (c) 2008, Intel Corporation.
5All rights reserved.
6
7Redistribution and use in source and binary forms, with or without
8modification, are permitted provided that the following conditions are met:
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10 1. Redistributions of source code must retain the above copyright notice,
11    this list of conditions and the following disclaimer.
12
13 2. Neither the name of the Myricom Inc, nor the names of its
14    contributors may be used to endorse or promote products derived from
15    this software without specific prior written permission.
16
17 2. Neither the name of the Intel Corporation, nor the names of its
18    contributors may be used to endorse or promote products derived from
19    this software without specific prior written permission.
20
21THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
22AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
25LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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27SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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29CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
30ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
31POSSIBILITY OF SUCH DAMAGE.
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33
34$FreeBSD: head/sys/netinet/tcp_lro.h 179737 2008-06-11 22:12:50Z jfv $
35
36***************************************************************************/
37#ifndef _TCP_LRO_H_
38#define _TCP_LRO_H_
39
40struct lro_entry;
41struct lro_entry
42{
43	SLIST_ENTRY(lro_entry) next;
44	struct mbuf  	*m_head;
45	struct mbuf	*m_tail;
46	int		timestamp;
47	struct ip	*ip;
48	uint32_t	tsval;
49	uint32_t	tsecr;
50	uint32_t	source_ip;
51	uint32_t	dest_ip;
52	uint32_t	next_seq;
53	uint32_t	ack_seq;
54	uint32_t	len;
55	uint32_t	data_csum;
56	uint16_t	window;
57	uint16_t	source_port;
58	uint16_t	dest_port;
59	uint16_t	append_cnt;
60	uint16_t	mss;
61
62};
63SLIST_HEAD(lro_head, lro_entry);
64
65struct lro_ctrl {
66	struct ifnet	*ifp;
67	int		lro_queued;
68	int		lro_flushed;
69	int		lro_bad_csum;
70	int		lro_cnt;
71
72	struct lro_head	lro_active;
73	struct lro_head	lro_free;
74};
75
76
77int tcp_lro_init(struct lro_ctrl *);
78void tcp_lro_free(struct lro_ctrl *);
79void tcp_lro_flush(struct lro_ctrl *, struct lro_entry *);
80int tcp_lro_rx(struct lro_ctrl *, struct mbuf *, uint32_t);
81
82/* Number of LRO entries - these are per rx queue */
83#define LRO_ENTRIES			8
84
85#endif /* _TCP_LRO_H_ */
86