tcp_offload.c revision 185571 
1/*-
2 * Copyright (c) 2007, Chelsio Inc.
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions are met:
7 *
8 * 1. Redistributions of source code must retain the above copyright notice,
9 *    this list of conditions and the following disclaimer.
10 *
11 * 2. Neither the name of the Chelsio Corporation nor the names of its
12 *    contributors may be used to endorse or promote products derived from
13 *    this software without specific prior written permission.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
16 * AND 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 COPYRIGHT OWNER OR CONTRIBUTORS BE
19 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
20 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
21 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
22 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
23 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
24 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
25 * POSSIBILITY OF SUCH DAMAGE.
26 */
27
28#include <sys/cdefs.h>
29__FBSDID("$FreeBSD: head/sys/netinet/tcp_offload.c 185571 2008-12-02 21:37:28Z bz $");
30
31#include <sys/param.h>
32#include <sys/systm.h>
33#include <sys/types.h>
34#include <sys/malloc.h>
35#include <sys/kernel.h>
36#include <sys/sysctl.h>
37#include <sys/mbuf.h>
38#include <sys/socket.h>
39#include <sys/socketvar.h>
40#include <sys/vimage.h>
41
42#include <net/if.h>
43#include <net/if_types.h>
44#include <net/if_var.h>
45
46#include <netinet/in.h>
47#include <netinet/in_systm.h>
48#include <netinet/in_pcb.h>
49#include <netinet/tcp.h>
50#include <netinet/tcp_var.h>
51#include <netinet/tcp_offload.h>
52#include <netinet/toedev.h>
53#include <netinet/vinet.h>
54
55uint32_t toedev_registration_count;
56
57int
58tcp_offload_connect(struct socket *so, struct sockaddr *nam)
59{
60	struct ifnet *ifp;
61	struct toedev *tdev;
62	struct rtentry *rt;
63	int error;
64
65	if (toedev_registration_count == 0)
66		return (EINVAL);
67
68	/*
69	 * Look up the route used for the connection to
70	 * determine if it uses an interface capable of
71	 * offloading the connection.
72	 */
73	rt = rtalloc1(nam, 0 /*report*/, 0 /*ignflags*/);
74	if (rt)
75		RT_UNLOCK(rt);
76	else
77		return (EHOSTUNREACH);
78
79	ifp = rt->rt_ifp;
80	if ((ifp->if_capenable & IFCAP_TOE) == 0) {
81		error = EINVAL;
82		goto fail;
83	}
84
85	tdev = TOEDEV(ifp);
86	if (tdev == NULL) {
87		error = EPERM;
88		goto fail;
89	}
90
91	if (tdev->tod_can_offload(tdev, so) == 0) {
92		error = EPERM;
93		goto fail;
94	}
95
96	return (tdev->tod_connect(tdev, so, rt, nam));
97fail:
98	RTFREE(rt);
99	return (error);
100}
101
102
103/*
104 * This file contains code as a short-term staging area before it is moved in
105 * to sys/netinet/tcp_offload.c
106 */
107
108void
109tcp_offload_twstart(struct tcpcb *tp)
110{
111	INIT_VNET_INET(curvnet);
112
113	INP_INFO_WLOCK(&V_tcbinfo);
114	INP_WLOCK(tp->t_inpcb);
115	tcp_twstart(tp);
116	INP_INFO_WUNLOCK(&V_tcbinfo);
117}
118
119struct tcpcb *
120tcp_offload_close(struct tcpcb *tp)
121{
122	INIT_VNET_INET(curvnet);
123
124	INP_INFO_WLOCK(&V_tcbinfo);
125	INP_WLOCK(tp->t_inpcb);
126	tp = tcp_close(tp);
127	INP_INFO_WUNLOCK(&V_tcbinfo);
128	if (tp)
129		INP_WUNLOCK(tp->t_inpcb);
130
131	return (tp);
132}
133
134struct tcpcb *
135tcp_offload_drop(struct tcpcb *tp, int error)
136{
137	INIT_VNET_INET(curvnet);
138
139	INP_INFO_WLOCK(&V_tcbinfo);
140	INP_WLOCK(tp->t_inpcb);
141	tp = tcp_drop(tp, error);
142	INP_INFO_WUNLOCK(&V_tcbinfo);
143	if (tp)
144		INP_WUNLOCK(tp->t_inpcb);
145
146	return (tp);
147}
148
149