sys/netinet/tcp_offload.c

   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_offload.h>
  46 #define TCPOUTFLAGS
  47 #include <netinet/tcp_fsm.h>
  48 #include <netinet/tcp_var.h>
  49 #include <netinet/toecore.h>
  50
  51 int registered_toedevs;
  52
  53 /*
  54  * Provide an opportunity for a TOE driver to offload.
  55  */
  56 int
  57 tcp_offload_connect(struct socket *so, struct sockaddr *nam)
  58 {
  59         struct ifnet *ifp;
  60         struct toedev *tod;
  61         struct rtentry *rt;
  62         int error = EOPNOTSUPP;
  63
  64         INP_WLOCK_ASSERT(sotoinpcb(so));
  65         KASSERT(nam->sa_family == AF_INET || nam->sa_family == AF_INET6,
  66             ("%s: called with sa_family %d", __func__, nam->sa_family));
  67
  68         if (registered_toedevs == 0)
  69                 return (error);
  70
  71         rt = rtalloc1(nam, 0, 0);
  72         if (rt)
  73                 RT_UNLOCK(rt);
  74         else
  75                 return (EHOSTUNREACH);
  76
  77         ifp = rt->rt_ifp;
  78
  79         if (nam->sa_family == AF_INET && !(ifp->if_capenable & IFCAP_TOE4))
  80                 goto done;
  81         if (nam->sa_family == AF_INET6 && !(ifp->if_capenable & IFCAP_TOE6))
  82                 goto done;
  83
  84         tod = TOEDEV(ifp);
  85         if (tod != NULL)
  86                 error = tod->tod_connect(tod, so, rt, nam);
  87 done:
  88         RTFREE(rt);
  89         return (error);
  90 }
  91
  92 void
  93 tcp_offload_listen_start(struct tcpcb *tp)
  94 {
  95
  96         INP_WLOCK_ASSERT(tp->t_inpcb);
  97
  98         EVENTHANDLER_INVOKE(tcp_offload_listen_start, tp);
  99 }
 100
 101 void
 102 tcp_offload_listen_stop(struct tcpcb *tp)
 103 {
 104
 105         INP_WLOCK_ASSERT(tp->t_inpcb);
 106
 107         EVENTHANDLER_INVOKE(tcp_offload_listen_stop, tp);
 108 }
 109
 110 void
 111 tcp_offload_input(struct tcpcb *tp, struct mbuf *m)
 112 {
 113         struct toedev *tod = tp->tod;
 114
 115         KASSERT(tod != NULL, ("%s: tp->tod is NULL, tp %p", __func__, tp));
 116         INP_WLOCK_ASSERT(tp->t_inpcb);
 117
 118         tod->tod_input(tod, tp, m);
 119 }
 120
 121 int
 122 tcp_offload_output(struct tcpcb *tp)
 123 {
 124         struct toedev *tod = tp->tod;
 125         int error, flags;
 126
 127         KASSERT(tod != NULL, ("%s: tp->tod is NULL, tp %p", __func__, tp));
 128         INP_WLOCK_ASSERT(tp->t_inpcb);
 129
 130         flags = tcp_outflags[tp->t_state];
 131
 132         if (flags & TH_RST) {
 133                 /* XXX: avoid repeated calls like we do for FIN */
 134                 error = tod->tod_send_rst(tod, tp);
 135         } else if ((flags & TH_FIN || tp->t_flags & TF_NEEDFIN) &&
 136             (tp->t_flags & TF_SENTFIN) == 0) {
 137                 error = tod->tod_send_fin(tod, tp);
 138                 if (error == 0)
 139                         tp->t_flags |= TF_SENTFIN;
 140         } else
 141                 error = tod->tod_output(tod, tp);
 142
 143         return (error);
 144 }
 145
 146 void
 147 tcp_offload_rcvd(struct tcpcb *tp)
 148 {
 149         struct toedev *tod = tp->tod;
 150
 151         KASSERT(tod != NULL, ("%s: tp->tod is NULL, tp %p", __func__, tp));
 152         INP_WLOCK_ASSERT(tp->t_inpcb);
 153
 154         tod->tod_rcvd(tod, tp);
 155 }
 156
 157 void
 158 tcp_offload_ctloutput(struct tcpcb *tp, int sopt_dir, int sopt_name)
 159 {
 160         struct toedev *tod = tp->tod;
 161
 162         KASSERT(tod != NULL, ("%s: tp->tod is NULL, tp %p", __func__, tp));
 163         INP_WLOCK_ASSERT(tp->t_inpcb);
 164
 165         tod->tod_ctloutput(tod, tp, sopt_dir, sopt_name);
 166 }
 167
 168 void
 169 tcp_offload_detach(struct tcpcb *tp)
 170 {
 171         struct toedev *tod = tp->tod;
 172
 173         KASSERT(tod != NULL, ("%s: tp->tod is NULL, tp %p", __func__, tp));
 174         INP_WLOCK_ASSERT(tp->t_inpcb);
 175
 176         tod->tod_pcb_detach(tod, tp);
 177 }