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

     /*-
      * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
      *
      * Copyright (c) 2012 Chelsio Communications, Inc.
      * All rights reserved.
      *
      * Redistribution and use in source and binary forms, with or without
      * modification, are permitted provided that the following conditions
      * are met:
     * 1. Redistributions of source code must retain the above copyright
     *    notice, this list of conditions and the following disclaimer.
     * 2. Redistributions in binary form must reproduce the above copyright
     *    notice, this list of conditions and the following disclaimer in the
     *    documentation and/or other materials provided with the distribution.
     *
     * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
     * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
     * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     * SUCH DAMAGE.
     */
    
    #include <sys/cdefs.h>
    __FBSDID("$FreeBSD: releng/12.0/sys/netinet/tcp_offload.c 335577 2018-06-23 06:53:53Z glebius $");
    
    #include "opt_inet.h"
    
    #include <sys/param.h>
    #include <sys/systm.h>
    #include <sys/types.h>
    #include <sys/mbuf.h>
    #include <sys/socket.h>
    #include <sys/socketvar.h>
    #include <sys/sockopt.h>
    #include <net/if.h>
    #include <net/if_var.h>
    #include <net/route.h>
    #include <netinet/in.h>
    #include <netinet/in_pcb.h>
    #include <netinet/tcp.h>
    #include <netinet/tcp_offload.h>
    #define TCPOUTFLAGS
    #include <netinet/tcp_fsm.h>
    #include <netinet/tcp_var.h>
    #include <netinet/toecore.h>
    
    int registered_toedevs;
    
    /*
     * Provide an opportunity for a TOE driver to offload.
     */
    int
    tcp_offload_connect(struct socket *so, struct sockaddr *nam)
    {
            struct ifnet *ifp;
            struct toedev *tod;
            struct rtentry *rt;
            int error = EOPNOTSUPP;
    
            INP_WLOCK_ASSERT(sotoinpcb(so));
            KASSERT(nam->sa_family == AF_INET || nam->sa_family == AF_INET6,
                ("%s: called with sa_family %d", __func__, nam->sa_family));
    
            if (registered_toedevs == 0)
                    return (error);
    
            rt = rtalloc1(nam, 0, 0);
            if (rt)
                    RT_UNLOCK(rt);
            else
                    return (EHOSTUNREACH);
    
            ifp = rt->rt_ifp;
    
            if (nam->sa_family == AF_INET && !(ifp->if_capenable & IFCAP_TOE4))
                    goto done;
            if (nam->sa_family == AF_INET6 && !(ifp->if_capenable & IFCAP_TOE6))
                    goto done;
    
            tod = TOEDEV(ifp);
            if (tod != NULL)
                    error = tod->tod_connect(tod, so, rt, nam);
    done:
            RTFREE(rt);
            return (error);
    }
    
    void
    tcp_offload_listen_start(struct tcpcb *tp)
    {
    
            INP_WLOCK_ASSERT(tp->t_inpcb);
    
           EVENTHANDLER_INVOKE(tcp_offload_listen_start, tp);
   }
   
   void
   tcp_offload_listen_stop(struct tcpcb *tp)
   {
   
           INP_WLOCK_ASSERT(tp->t_inpcb);
   
           EVENTHANDLER_INVOKE(tcp_offload_listen_stop, tp);
   }
   
   void
   tcp_offload_input(struct tcpcb *tp, struct mbuf *m)
   {
           struct toedev *tod = tp->tod;
   
           KASSERT(tod != NULL, ("%s: tp->tod is NULL, tp %p", __func__, tp));
           INP_WLOCK_ASSERT(tp->t_inpcb);
   
           tod->tod_input(tod, tp, m);
   }
   
   int
   tcp_offload_output(struct tcpcb *tp)
   {
           struct toedev *tod = tp->tod;
           int error, flags;
   
           KASSERT(tod != NULL, ("%s: tp->tod is NULL, tp %p", __func__, tp));
           INP_WLOCK_ASSERT(tp->t_inpcb);
   
           flags = tcp_outflags[tp->t_state];
   
           if (flags & TH_RST) {
                   /* XXX: avoid repeated calls like we do for FIN */
                   error = tod->tod_send_rst(tod, tp);
           } else if ((flags & TH_FIN || tp->t_flags & TF_NEEDFIN) &&
               (tp->t_flags & TF_SENTFIN) == 0) {
                   error = tod->tod_send_fin(tod, tp);
                   if (error == 0)
                           tp->t_flags |= TF_SENTFIN;
           } else
                   error = tod->tod_output(tod, tp);
   
           return (error);
   }
   
   void
   tcp_offload_rcvd(struct tcpcb *tp)
   {
           struct toedev *tod = tp->tod;
   
           KASSERT(tod != NULL, ("%s: tp->tod is NULL, tp %p", __func__, tp));
           INP_WLOCK_ASSERT(tp->t_inpcb);
   
           tod->tod_rcvd(tod, tp);
   }
   
   void
   tcp_offload_ctloutput(struct tcpcb *tp, int sopt_dir, int sopt_name)
   {
           struct toedev *tod = tp->tod;
   
           KASSERT(tod != NULL, ("%s: tp->tod is NULL, tp %p", __func__, tp));
           INP_WLOCK_ASSERT(tp->t_inpcb);
   
           tod->tod_ctloutput(tod, tp, sopt_dir, sopt_name);
   }
   
   void
   tcp_offload_tcp_info(struct tcpcb *tp, struct tcp_info *ti)
   {
           struct toedev *tod = tp->tod;
   
           KASSERT(tod != NULL, ("%s: tp->tod is NULL, tp %p", __func__, tp));
           INP_WLOCK_ASSERT(tp->t_inpcb);
   
           tod->tod_tcp_info(tod, tp, ti);
   }
   
   void
   tcp_offload_detach(struct tcpcb *tp)
   {
           struct toedev *tod = tp->tod;
   
           KASSERT(tod != NULL, ("%s: tp->tod is NULL, tp %p", __func__, tp));
           INP_WLOCK_ASSERT(tp->t_inpcb);
   
           tod->tod_pcb_detach(tod, tp);
   }

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