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/toecore.h

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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  * $FreeBSD: releng/10.4/sys/netinet/toecore.h 239511 2012-08-21 18:09:33Z np $
   27  */
   28 
   29 #ifndef _NETINET_TOE_H_
   30 #define _NETINET_TOE_H_
   31 
   32 #ifndef _KERNEL
   33 #error "no user-serviceable parts inside"
   34 #endif
   35 
   36 struct tcpopt;
   37 struct tcphdr;
   38 struct in_conninfo;
   39 
   40 struct toedev {
   41         TAILQ_ENTRY(toedev) link;       /* glue for toedev_list */
   42         void *tod_softc;                /* TOE driver private data */
   43 
   44         /*
   45          * Active open.  If a failure occurs, it is reported back by the driver
   46          * via toe_connect_failed.
   47          */
   48         int (*tod_connect)(struct toedev *, struct socket *, struct rtentry *,
   49             struct sockaddr *);
   50 
   51         /* Passive open. */
   52         int (*tod_listen_start)(struct toedev *, struct tcpcb *);
   53         int (*tod_listen_stop)(struct toedev *, struct tcpcb *);
   54 
   55         /*
   56          * The kernel uses this routine to pass on any frame it receives for an
   57          * offloaded connection to the TOE driver.  This is an unusual event.
   58          */
   59         void (*tod_input)(struct toedev *, struct tcpcb *, struct mbuf *);
   60 
   61         /*
   62          * This is called by the kernel during pru_rcvd for an offloaded TCP
   63          * connection and provides an opportunity for the TOE driver to manage
   64          * its rx window and credits.
   65          */
   66         void (*tod_rcvd)(struct toedev *, struct tcpcb *);
   67 
   68         /*
   69          * Transmit routine.  The kernel calls this to have the TOE driver
   70          * evaluate whether there is data to be transmitted, and transmit it.
   71          */
   72         int (*tod_output)(struct toedev *, struct tcpcb *);
   73 
   74         /* Immediate teardown: send RST to peer. */
   75         int (*tod_send_rst)(struct toedev *, struct tcpcb *);
   76 
   77         /* Initiate orderly disconnect by sending FIN to the peer. */
   78         int (*tod_send_fin)(struct toedev *, struct tcpcb *);
   79 
   80         /* Called to indicate that the kernel is done with this TCP PCB. */
   81         void (*tod_pcb_detach)(struct toedev *, struct tcpcb *);
   82 
   83         /*
   84          * The kernel calls this once it has information about an L2 entry that
   85          * the TOE driver enquired about previously (via toe_l2_resolve).
   86          */
   87         void (*tod_l2_update)(struct toedev *, struct ifnet *,
   88             struct sockaddr *, uint8_t *, uint16_t);
   89 
   90         /* XXX.  Route has been redirected. */
   91         void (*tod_route_redirect)(struct toedev *, struct ifnet *,
   92             struct rtentry *, struct rtentry *);
   93 
   94         /* Syncache interaction. */
   95         void (*tod_syncache_added)(struct toedev *, void *);
   96         void (*tod_syncache_removed)(struct toedev *, void *);
   97         int (*tod_syncache_respond)(struct toedev *, void *, struct mbuf *);
   98         void (*tod_offload_socket)(struct toedev *, void *, struct socket *);
   99 
  100         /* TCP socket option */
  101         void (*tod_ctloutput)(struct toedev *, struct tcpcb *, int, int);
  102 };
  103 
  104 #include <sys/eventhandler.h>
  105 typedef void (*tcp_offload_listen_start_fn)(void *, struct tcpcb *);
  106 typedef void (*tcp_offload_listen_stop_fn)(void *, struct tcpcb *);
  107 EVENTHANDLER_DECLARE(tcp_offload_listen_start, tcp_offload_listen_start_fn);
  108 EVENTHANDLER_DECLARE(tcp_offload_listen_stop, tcp_offload_listen_stop_fn);
  109 
  110 void init_toedev(struct toedev *);
  111 int register_toedev(struct toedev *);
  112 int unregister_toedev(struct toedev *);
  113 
  114 /*
  115  * General interface for looking up L2 information for an IP address.  If an
  116  * answer is not available right away then the TOE driver's tod_l2_update will
  117  * be called later.
  118  */
  119 int toe_l2_resolve(struct toedev *, struct ifnet *, struct sockaddr *,
  120     uint8_t *, uint16_t *);
  121 
  122 void toe_connect_failed(struct toedev *, struct inpcb *, int);
  123 
  124 void toe_syncache_add(struct in_conninfo *, struct tcpopt *, struct tcphdr *,
  125     struct inpcb *, void *, void *);
  126 int  toe_syncache_expand(struct in_conninfo *, struct tcpopt *, struct tcphdr *,
  127     struct socket **);
  128 
  129 int toe_4tuple_check(struct in_conninfo *, struct tcphdr *, struct ifnet *);
  130 #endif

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