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/11.0/sys/netinet/tcp_offload.c 294869 2016-01-27 00:45:46Z glebius $");
   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 }

Cache object: 98fec5e02a6525ca8df7de970c318307


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