tcp_offload.c revision 174768 
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 174768 2007-12-19 05:17:40Z kmacy $");
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
41#include <net/if.h>
42#include <net/if_types.h>
43#include <net/if_var.h>
44
45#include <netinet/in.h>
46#include <netinet/in_systm.h>
47#include <netinet/in_pcb.h>
48#include <netinet/tcp.h>
49#include <netinet/tcp_var.h>
50#include <netinet/tcp_offload.h>
51#include <netinet/toedev.h>
52
53
54int
55tcp_offload_connect(struct socket *so, struct sockaddr *nam)
56{
57	struct ifnet *ifp;
58	struct toedev *tdev;
59	struct rtentry *rt;
60	int error;
61
62	/*
63	 * Look up the route used for the connection to
64	 * determine if it uses an interface capable of
65	 * offloading the connection.
66	 */
67	rt = rtalloc1(nam, 1 /*report*/, 0 /*ignflags*/);
68	if (rt)
69		RT_UNLOCK(rt);
70	else
71		return (EHOSTUNREACH);
72
73	ifp = rt->rt_ifp;
74	if ((ifp->if_capenable & IFCAP_TOE) == 0) {
75		error = EINVAL;
76		goto fail;
77	}
78
79	tdev = TOEDEV(ifp);
80	if (tdev == NULL) {
81		error = EPERM;
82		goto fail;
83	}
84
85	if (tdev->tod_can_offload(tdev, so) == 0) {
86		error = EPERM;
87		goto fail;
88	}
89
90	return (tdev->tod_connect(tdev, so, rt, nam));
91fail:
92	RTFREE(rt);
93	return (error);
94}
95