The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/netinet/tcp_offload.c

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    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: releng/10.1/sys/netinet/tcp_offload.c 237263 2012-06-19 07:34:13Z np $");
   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/route.h>
   41 #include <netinet/in.h>
   42 #include <netinet/in_pcb.h>
   43 #include <netinet/tcp.h>
   44 #include <netinet/tcp_var.h>
   45 #include <netinet/tcp_offload.h>
   46 #define TCPOUTFLAGS
   47 #include <netinet/tcp_fsm.h>
   48 #include <netinet/toecore.h>
   49 
   50 int registered_toedevs;
   51 
   52 /*
   53  * Provide an opportunity for a TOE driver to offload.
   54  */
   55 int
   56 tcp_offload_connect(struct socket *so, struct sockaddr *nam)
   57 {
   58         struct ifnet *ifp;
   59         struct toedev *tod;
   60         struct rtentry *rt;
   61         int error = EOPNOTSUPP;
   62 
   63         INP_WLOCK_ASSERT(sotoinpcb(so));
   64         KASSERT(nam->sa_family == AF_INET || nam->sa_family == AF_INET6,
   65             ("%s: called with sa_family %d", __func__, nam->sa_family));
   66 
   67         if (registered_toedevs == 0)
   68                 return (error);
   69 
   70         rt = rtalloc1(nam, 0, 0);
   71         if (rt)
   72                 RT_UNLOCK(rt);
   73         else
   74                 return (EHOSTUNREACH);
   75 
   76         ifp = rt->rt_ifp;
   77 
   78         if (nam->sa_family == AF_INET && !(ifp->if_capenable & IFCAP_TOE4))
   79                 goto done;
   80         if (nam->sa_family == AF_INET6 && !(ifp->if_capenable & IFCAP_TOE6))
   81                 goto done;
   82 
   83         tod = TOEDEV(ifp);
   84         if (tod != NULL)
   85                 error = tod->tod_connect(tod, so, rt, nam);
   86 done:
   87         RTFREE(rt);
   88         return (error);
   89 }
   90 
   91 void
   92 tcp_offload_listen_start(struct tcpcb *tp)
   93 {
   94 
   95         INP_WLOCK_ASSERT(tp->t_inpcb);
   96 
   97         EVENTHANDLER_INVOKE(tcp_offload_listen_start, tp);
   98 }
   99 
  100 void
  101 tcp_offload_listen_stop(struct tcpcb *tp)
  102 {
  103 
  104         INP_WLOCK_ASSERT(tp->t_inpcb);
  105 
  106         EVENTHANDLER_INVOKE(tcp_offload_listen_stop, tp);
  107 }
  108 
  109 void
  110 tcp_offload_input(struct tcpcb *tp, struct mbuf *m)
  111 {
  112         struct toedev *tod = tp->tod;
  113 
  114         KASSERT(tod != NULL, ("%s: tp->tod is NULL, tp %p", __func__, tp));
  115         INP_WLOCK_ASSERT(tp->t_inpcb);
  116 
  117         tod->tod_input(tod, tp, m);
  118 }
  119 
  120 int
  121 tcp_offload_output(struct tcpcb *tp)
  122 {
  123         struct toedev *tod = tp->tod;
  124         int error, flags;
  125 
  126         KASSERT(tod != NULL, ("%s: tp->tod is NULL, tp %p", __func__, tp));
  127         INP_WLOCK_ASSERT(tp->t_inpcb);
  128 
  129         flags = tcp_outflags[tp->t_state];
  130 
  131         if (flags & TH_RST) {
  132                 /* XXX: avoid repeated calls like we do for FIN */
  133                 error = tod->tod_send_rst(tod, tp);
  134         } else if ((flags & TH_FIN || tp->t_flags & TF_NEEDFIN) &&
  135             (tp->t_flags & TF_SENTFIN) == 0) {
  136                 error = tod->tod_send_fin(tod, tp);
  137                 if (error == 0)
  138                         tp->t_flags |= TF_SENTFIN;
  139         } else
  140                 error = tod->tod_output(tod, tp);
  141 
  142         return (error);
  143 }
  144 
  145 void
  146 tcp_offload_rcvd(struct tcpcb *tp)
  147 {
  148         struct toedev *tod = tp->tod;
  149 
  150         KASSERT(tod != NULL, ("%s: tp->tod is NULL, tp %p", __func__, tp));
  151         INP_WLOCK_ASSERT(tp->t_inpcb);
  152 
  153         tod->tod_rcvd(tod, tp);
  154 }
  155 
  156 void
  157 tcp_offload_ctloutput(struct tcpcb *tp, int sopt_dir, int sopt_name)
  158 {
  159         struct toedev *tod = tp->tod;
  160 
  161         KASSERT(tod != NULL, ("%s: tp->tod is NULL, tp %p", __func__, tp));
  162         INP_WLOCK_ASSERT(tp->t_inpcb);
  163 
  164         tod->tod_ctloutput(tod, tp, sopt_dir, sopt_name);
  165 }
  166 
  167 void
  168 tcp_offload_detach(struct tcpcb *tp)
  169 {
  170         struct toedev *tod = tp->tod;
  171 
  172         KASSERT(tod != NULL, ("%s: tp->tod is NULL, tp %p", __func__, tp));
  173         INP_WLOCK_ASSERT(tp->t_inpcb);
  174 
  175         tod->tod_pcb_detach(tod, tp);
  176 }

Cache object: d70535be3cb18b61b32c545b7d9fb3dd


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