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