tcp_offload.c

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    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: releng/7.3/sys/netinet/tcp_offload.c 182949 2008-09-11 23:49:36Z kmacy $");
   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 
   41 #include <net/if.h>
   42 #include <net/if_types.h>
   43 #include <net/if_var.h>
   44 
   45 #include <netinet/in.h>
   46 #include <netinet/in_systm.h>
   47 #include <netinet/in_pcb.h>
   48 #include <netinet/tcp.h>
   49 #include <netinet/tcp_var.h>
   50 #include <netinet/tcp_offload.h>
   51 #include <netinet/toedev.h>
   52 
   53 uint32_t toedev_registration_count;
   54 
   55 int
   56 tcp_offload_connect(struct socket *so, struct sockaddr *nam)
   57 {
   58         struct ifnet *ifp;
   59         struct toedev *tdev;
   60         struct rtentry *rt;
   61         int error;
   62         
   63         if (toedev_registration_count == 0)
   64                 return (EINVAL);
   65         
   66         /*
   67          * Look up the route used for the connection to 
   68          * determine if it uses an interface capable of
   69          * offloading the connection.
   70          */
   71         rt = rtalloc1(nam, 0 /*report*/, 0 /*ignflags*/);
   72         if (rt) 
   73                 RT_UNLOCK(rt);
   74         else 
   75                 return (EHOSTUNREACH);
   76 
   77         ifp = rt->rt_ifp;
   78         if ((ifp->if_capenable & IFCAP_TOE) == 0) {
   79                 error = EINVAL;
   80                 goto fail;
   81         }
   82         
   83         tdev = TOEDEV(ifp);
   84         if (tdev == NULL) {
   85                 error = EPERM;
   86                 goto fail;
   87         }
   88         
   89         if (tdev->tod_can_offload(tdev, so) == 0) {
   90                 error = EPERM;
   91                 goto fail;
   92         }
   93         
   94         return (tdev->tod_connect(tdev, so, rt, nam));
   95 fail:
   96         RTFREE(rt);
   97         return (error);
   98 }
   99 
  100 
  101 /*
  102  * This file contains code as a short-term staging area before it is moved in 
  103  * to sys/netinet/tcp_offload.c
  104  */
  105 
  106 void
  107 tcp_offload_twstart(struct tcpcb *tp)
  108 {
  109 
  110         INP_INFO_WLOCK(&tcbinfo);
  111         INP_WLOCK(tp->t_inpcb);
  112         tcp_twstart(tp);
  113         INP_INFO_WUNLOCK(&tcbinfo);
  114 }
  115 
  116 struct tcpcb *
  117 tcp_offload_close(struct tcpcb *tp)
  118 {
  119         
  120         INP_INFO_WLOCK(&tcbinfo);
  121         INP_WLOCK(tp->t_inpcb);
  122         tp = tcp_close(tp);
  123         INP_INFO_WUNLOCK(&tcbinfo);
  124         if (tp)
  125                 INP_WUNLOCK(tp->t_inpcb);
  126 
  127         return (tp);
  128 }
  129 
  130 struct tcpcb *
  131 tcp_offload_drop(struct tcpcb *tp, int error)
  132 {
  133         
  134         INP_INFO_WLOCK(&tcbinfo);
  135         INP_WLOCK(tp->t_inpcb);
  136         tp = tcp_drop(tp, error);
  137         INP_INFO_WUNLOCK(&tcbinfo);
  138         if (tp)
  139                 INP_WUNLOCK(tp->t_inpcb);
  140 
  141         return (tp);
  142 }
  143

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

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