xref: /freebsd/sys/netinet/tcp_offload.c (revision 39beb93c3f8bdbf72a61fda42300b5ebed7390c8)
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("$FreeBSD$");
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 
55 uint32_t toedev_registration_count;
56 
57 int
58 tcp_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));
97 fail:
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 
108 void
109 tcp_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 
119 struct tcpcb *
120 tcp_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 
134 struct tcpcb *
135 tcp_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