xref: /freebsd/sys/netinet/tcp_offload.c (revision 7b42f6fae2b79240319176206759c9a211123afa)
1 /*-
2  * Copyright (c) 2012 Chelsio Communications, 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
7  * are met:
8  * 1. Redistributions of source code must retain the above copyright
9  *    notice, this list of conditions and the following disclaimer.
10  * 2. Redistributions in binary form must reproduce the above copyright
11  *    notice, this list of conditions and the following disclaimer in the
12  *    documentation and/or other materials provided with the distribution.
13  *
14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24  * SUCH DAMAGE.
25  */
26 
27 #include <sys/cdefs.h>
28 __FBSDID("$FreeBSD$");
29 
30 #include "opt_inet.h"
31 
32 #include <sys/param.h>
33 #include <sys/systm.h>
34 #include <sys/types.h>
35 #include <sys/mbuf.h>
36 #include <sys/socket.h>
37 #include <sys/socketvar.h>
38 #include <sys/sockopt.h>
39 #include <net/if.h>
40 #include <net/if_var.h>
41 #include <net/route.h>
42 #include <netinet/in.h>
43 #include <netinet/in_pcb.h>
44 #include <netinet/tcp.h>
45 #include <netinet/tcp_var.h>
46 #include <netinet/tcp_offload.h>
47 #include <net/rt_nhops.h>
48 #define	TCPOUTFLAGS
49 #include <netinet/tcp_fsm.h>
50 #include <netinet/toecore.h>
51 
52 int registered_toedevs;
53 
54 /*
55  * Provide an opportunity for a TOE driver to offload.
56  */
57 int
58 tcp_offload_connect(struct socket *so, struct sockaddr *nam)
59 {
60 	struct ifnet *ifp;
61 	struct toedev *tod;
62 	struct nhopu_extended nhu_ext;
63 	int af, error = EOPNOTSUPP;
64 	int fibnum;
65 
66 	INP_WLOCK_ASSERT(sotoinpcb(so));
67 	KASSERT(nam->sa_family == AF_INET || nam->sa_family == AF_INET6,
68 	    ("%s: called with sa_family %d", __func__, nam->sa_family));
69 
70 	if (registered_toedevs == 0)
71 		return (error);
72 
73 	af = nam->sa_family;
74 	fibnum = so->so_fibnum;
75 	ifp = NULL;
76 
77 	/* TODO: Multipath */
78 	if (af == AF_INET) {
79 		if (fib4_lookup_nh_ext(fibnum,
80 		    ((struct sockaddr_in *)nam)->sin_addr,
81 		    0, NHOP_LOOKUP_REF, &nhu_ext.u.nh4) != 0)
82 			return (EHOSTUNREACH);
83 
84 		ifp = nhu_ext.u.nh4.nh_ifp;
85 		if ((ifp->if_capenable & IFCAP_TOE4) == 0)
86 			goto done;
87 	} else if (af == AF_INET6) {
88 		struct sockaddr_in6 *sin6;
89 
90 		sin6 = (struct sockaddr_in6 *)nam;
91 
92 		if (fib6_lookup_nh_ext(fibnum,
93 		    sin6->sin6_addr, sin6->sin6_scope_id,
94 		    0, NHOP_LOOKUP_REF, &nhu_ext.u.nh6) != 0)
95 			return (EHOSTUNREACH);
96 
97 		ifp = nhu_ext.u.nh6.nh_ifp;
98 		if ((ifp->if_capenable & IFCAP_TOE6) == 0)
99 			goto done;
100 	}
101 
102 	tod = TOEDEV(ifp);
103 	if (tod != NULL)
104 		error = tod->tod_connect(tod, so, &nhu_ext, nam);
105 done:
106 	fib_free_nh_ext(fibnum, &nhu_ext);
107 	return (error);
108 }
109 
110 void
111 tcp_offload_listen_start(struct tcpcb *tp)
112 {
113 
114 	INP_WLOCK_ASSERT(tp->t_inpcb);
115 
116 	EVENTHANDLER_INVOKE(tcp_offload_listen_start, tp);
117 }
118 
119 void
120 tcp_offload_listen_stop(struct tcpcb *tp)
121 {
122 
123 	INP_WLOCK_ASSERT(tp->t_inpcb);
124 
125 	EVENTHANDLER_INVOKE(tcp_offload_listen_stop, tp);
126 }
127 
128 void
129 tcp_offload_input(struct tcpcb *tp, struct mbuf *m)
130 {
131 	struct toedev *tod = tp->tod;
132 
133 	KASSERT(tod != NULL, ("%s: tp->tod is NULL, tp %p", __func__, tp));
134 	INP_WLOCK_ASSERT(tp->t_inpcb);
135 
136 	tod->tod_input(tod, tp, m);
137 }
138 
139 int
140 tcp_offload_output(struct tcpcb *tp)
141 {
142 	struct toedev *tod = tp->tod;
143 	int error, flags;
144 
145 	KASSERT(tod != NULL, ("%s: tp->tod is NULL, tp %p", __func__, tp));
146 	INP_WLOCK_ASSERT(tp->t_inpcb);
147 
148 	flags = tcp_outflags[tp->t_state];
149 
150 	if (flags & TH_RST) {
151 		/* XXX: avoid repeated calls like we do for FIN */
152 		error = tod->tod_send_rst(tod, tp);
153 	} else if ((flags & TH_FIN || tp->t_flags & TF_NEEDFIN) &&
154 	    (tp->t_flags & TF_SENTFIN) == 0) {
155 		error = tod->tod_send_fin(tod, tp);
156 		if (error == 0)
157 			tp->t_flags |= TF_SENTFIN;
158 	} else
159 		error = tod->tod_output(tod, tp);
160 
161 	return (error);
162 }
163 
164 void
165 tcp_offload_rcvd(struct tcpcb *tp)
166 {
167 	struct toedev *tod = tp->tod;
168 
169 	KASSERT(tod != NULL, ("%s: tp->tod is NULL, tp %p", __func__, tp));
170 	INP_WLOCK_ASSERT(tp->t_inpcb);
171 
172 	tod->tod_rcvd(tod, tp);
173 }
174 
175 void
176 tcp_offload_ctloutput(struct tcpcb *tp, int sopt_dir, int sopt_name)
177 {
178 	struct toedev *tod = tp->tod;
179 
180 	KASSERT(tod != NULL, ("%s: tp->tod is NULL, tp %p", __func__, tp));
181 	INP_WLOCK_ASSERT(tp->t_inpcb);
182 
183 	tod->tod_ctloutput(tod, tp, sopt_dir, sopt_name);
184 }
185 
186 void
187 tcp_offload_detach(struct tcpcb *tp)
188 {
189 	struct toedev *tod = tp->tod;
190 
191 	KASSERT(tod != NULL, ("%s: tp->tod is NULL, tp %p", __func__, tp));
192 	INP_WLOCK_ASSERT(tp->t_inpcb);
193 
194 	tod->tod_pcb_detach(tod, tp);
195 }
196