sys/netinet/tcp_offload.c

   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("$FreeBSD$");
  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 #include <sys/vimage.h>
  41
  42 #include <net/if.h>
  43 #include <net/if_types.h>
  44 #include <net/if_var.h>
  45
  46 #include <netinet/in.h>
  47 #include <netinet/in_systm.h>
  48 #include <netinet/in_pcb.h>
  49 #include <netinet/tcp.h>
  50 #include <netinet/tcp_var.h>
  51 #include <netinet/tcp_offload.h>
  52 #include <netinet/toedev.h>
  53
  54 uint32_t toedev_registration_count;
  55
  56 int
  57 tcp_offload_connect(struct socket *so, struct sockaddr *nam)
  58 {
  59         struct ifnet *ifp;
  60         struct toedev *tdev;
  61         struct rtentry *rt;
  62         int error;
  63
  64         if (toedev_registration_count == 0)
  65                 return (EINVAL);
  66
  67         /*
  68          * Look up the route used for the connection to
  69          * determine if it uses an interface capable of
  70          * offloading the connection.
  71          */
  72         rt = rtalloc1(nam, 0 /*report*/, 0 /*ignflags*/);
  73         if (rt)
  74                 RT_UNLOCK(rt);
  75         else
  76                 return (EHOSTUNREACH);
  77
  78         ifp = rt->rt_ifp;
  79         if ((ifp->if_capenable & IFCAP_TOE) == 0) {
  80                 error = EINVAL;
  81                 goto fail;
  82         }
  83
  84         tdev = TOEDEV(ifp);
  85         if (tdev == NULL) {
  86                 error = EPERM;
  87                 goto fail;
  88         }
  89
  90         if (tdev->tod_can_offload(tdev, so) == 0) {
  91                 error = EPERM;
  92                 goto fail;
  93         }
  94
  95         return (tdev->tod_connect(tdev, so, rt, nam));
  96 fail:
  97         RTFREE(rt);
  98         return (error);
  99 }
 100
 101
 102 /*
 103  * This file contains code as a short-term staging area before it is moved in
 104  * to sys/netinet/tcp_offload.c
 105  */
 106
 107 void
 108 tcp_offload_twstart(struct tcpcb *tp)
 109 {
 110
 111         INP_INFO_WLOCK(&V_tcbinfo);
 112         INP_WLOCK(tp->t_inpcb);
 113         tcp_twstart(tp);
 114         INP_INFO_WUNLOCK(&V_tcbinfo);
 115 }
 116
 117 struct tcpcb *
 118 tcp_offload_close(struct tcpcb *tp)
 119 {
 120
 121         INP_INFO_WLOCK(&V_tcbinfo);
 122         INP_WLOCK(tp->t_inpcb);
 123         tp = tcp_close(tp);
 124         INP_INFO_WUNLOCK(&V_tcbinfo);
 125         if (tp)
 126                 INP_WUNLOCK(tp->t_inpcb);
 127
 128         return (tp);
 129 }
 130
 131 struct tcpcb *
 132 tcp_offload_drop(struct tcpcb *tp, int error)
 133 {
 134
 135         INP_INFO_WLOCK(&V_tcbinfo);
 136         INP_WLOCK(tp->t_inpcb);
 137         tp = tcp_drop(tp, error);
 138         INP_INFO_WUNLOCK(&V_tcbinfo);
 139         if (tp)
 140                 INP_WUNLOCK(tp->t_inpcb);
 141
 142         return (tp);
 143 }
 144