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
33struct lro_entry
34{
35	SLIST_ENTRY(lro_entry)	next;
36	struct mbuf		*m_head;
37	struct mbuf		*m_tail;
38	union {
39		struct ip	*ip4;
40		struct ip6_hdr	*ip6;
41	} leip;
42	union {
43		in_addr_t	s_ip4;
44		struct in6_addr	s_ip6;
45	} lesource;
46	union {
47		in_addr_t	d_ip4;
48		struct in6_addr	d_ip6;
49	} ledest;
50	uint16_t		source_port;
51	uint16_t		dest_port;
52	uint16_t		eh_type;	/* EthernetHeader type. */
53	uint16_t		append_cnt;
54	uint32_t		p_len;		/* IP header payload length. */
55	uint32_t		ulp_csum;	/* TCP, etc. checksum. */
56	uint32_t		next_seq;	/* tcp_seq */
57	uint32_t		ack_seq;	/* tcp_seq */
58	uint32_t		tsval;
59	uint32_t		tsecr;
60	uint16_t		window;
61	uint16_t		timestamp;	/* flag, not a TCP hdr field. */
62};
63SLIST_HEAD(lro_head, lro_entry);
64
65#define	le_ip4			leip.ip4
66#define	le_ip6			leip.ip6
67#define	source_ip4		lesource.s_ip4
68#define	dest_ip4		ledest.d_ip4
69#define	source_ip6		lesource.s_ip6
70#define	dest_ip6		ledest.d_ip6
71
72/* NB: This is part of driver structs. */
73struct lro_ctrl {
74	struct ifnet	*ifp;
75	int		lro_queued;
76	int		lro_flushed;
77	int		lro_bad_csum;
78	int		lro_cnt;
79
80	struct lro_head	lro_active;
81	struct lro_head	lro_free;
82};
83
84int tcp_lro_init(struct lro_ctrl *);
85void tcp_lro_free(struct lro_ctrl *);
86void tcp_lro_flush(struct lro_ctrl *, struct lro_entry *);
87int tcp_lro_rx(struct lro_ctrl *, struct mbuf *, uint32_t);
88
89#define	TCP_LRO_CANNOT		-1
90#define	TCP_LRO_NOT_SUPPORTED	1
91
92#endif /* _TCP_LRO_H_ */
93