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  * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
    3  *
    4  * Copyright (c) 2012 Chelsio Communications, Inc.
    5  * All rights reserved.
    6  *
    7  * Redistribution and use in source and binary forms, with or without
    8  * modification, are permitted provided that the following conditions
    9  * are met:
   10  * 1. Redistributions of source code must retain the above copyright
   11  *    notice, this list of conditions and the following disclaimer.
   12  * 2. Redistributions in binary form must reproduce the above copyright
   13  *    notice, this list of conditions and the following disclaimer in the
   14  *    documentation and/or other materials provided with the distribution.
   15  *
   16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   17  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   18  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   19  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   20  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   21  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   22  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   23  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   24  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   25  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   26  * SUCH DAMAGE.
   27  *
   28  * $FreeBSD: stable/12/sys/netinet/toecore.h 331901 2018-04-03 01:08:54Z np $
   29  */
   30 
   31 #ifndef _NETINET_TOE_H_
   32 #define _NETINET_TOE_H_
   33 
   34 #ifndef _KERNEL
   35 #error "no user-serviceable parts inside"
   36 #endif
   37 
   38 struct tcpopt;
   39 struct tcphdr;
   40 struct in_conninfo;
   41 struct tcp_info;
   42 
   43 struct toedev {
   44         TAILQ_ENTRY(toedev) link;       /* glue for toedev_list */
   45         void *tod_softc;                /* TOE driver private data */
   46 
   47         /*
   48          * Active open.  If a failure occurs, it is reported back by the driver
   49          * via toe_connect_failed.
   50          */
   51         int (*tod_connect)(struct toedev *, struct socket *, struct rtentry *,
   52             struct sockaddr *);
   53 
   54         /* Passive open. */
   55         int (*tod_listen_start)(struct toedev *, struct tcpcb *);
   56         int (*tod_listen_stop)(struct toedev *, struct tcpcb *);
   57 
   58         /*
   59          * The kernel uses this routine to pass on any frame it receives for an
   60          * offloaded connection to the TOE driver.  This is an unusual event.
   61          */
   62         void (*tod_input)(struct toedev *, struct tcpcb *, struct mbuf *);
   63 
   64         /*
   65          * This is called by the kernel during pru_rcvd for an offloaded TCP
   66          * connection and provides an opportunity for the TOE driver to manage
   67          * its rx window and credits.
   68          */
   69         void (*tod_rcvd)(struct toedev *, struct tcpcb *);
   70 
   71         /*
   72          * Transmit routine.  The kernel calls this to have the TOE driver
   73          * evaluate whether there is data to be transmitted, and transmit it.
   74          */
   75         int (*tod_output)(struct toedev *, struct tcpcb *);
   76 
   77         /* Immediate teardown: send RST to peer. */
   78         int (*tod_send_rst)(struct toedev *, struct tcpcb *);
   79 
   80         /* Initiate orderly disconnect by sending FIN to the peer. */
   81         int (*tod_send_fin)(struct toedev *, struct tcpcb *);
   82 
   83         /* Called to indicate that the kernel is done with this TCP PCB. */
   84         void (*tod_pcb_detach)(struct toedev *, struct tcpcb *);
   85 
   86         /*
   87          * The kernel calls this once it has information about an L2 entry that
   88          * the TOE driver enquired about previously (via toe_l2_resolve).
   89          */
   90         void (*tod_l2_update)(struct toedev *, struct ifnet *,
   91             struct sockaddr *, uint8_t *, uint16_t);
   92 
   93         /* XXX.  Route has been redirected. */
   94         void (*tod_route_redirect)(struct toedev *, struct ifnet *,
   95             struct rtentry *, struct rtentry *);
   96 
   97         /* Syncache interaction. */
   98         void (*tod_syncache_added)(struct toedev *, void *);
   99         void (*tod_syncache_removed)(struct toedev *, void *);
  100         int (*tod_syncache_respond)(struct toedev *, void *, struct mbuf *);
  101         void (*tod_offload_socket)(struct toedev *, void *, struct socket *);
  102 
  103         /* TCP socket option */
  104         void (*tod_ctloutput)(struct toedev *, struct tcpcb *, int, int);
  105 
  106         /* Update software state */
  107         void (*tod_tcp_info)(struct toedev *, struct tcpcb *,
  108             struct tcp_info *);
  109 };
  110 
  111 #include <sys/eventhandler.h>
  112 typedef void (*tcp_offload_listen_start_fn)(void *, struct tcpcb *);
  113 typedef void (*tcp_offload_listen_stop_fn)(void *, struct tcpcb *);
  114 EVENTHANDLER_DECLARE(tcp_offload_listen_start, tcp_offload_listen_start_fn);
  115 EVENTHANDLER_DECLARE(tcp_offload_listen_stop, tcp_offload_listen_stop_fn);
  116 
  117 void init_toedev(struct toedev *);
  118 int register_toedev(struct toedev *);
  119 int unregister_toedev(struct toedev *);
  120 
  121 /*
  122  * General interface for looking up L2 information for an IP address.  If an
  123  * answer is not available right away then the TOE driver's tod_l2_update will
  124  * be called later.
  125  */
  126 int toe_l2_resolve(struct toedev *, struct ifnet *, struct sockaddr *,
  127     uint8_t *, uint16_t *);
  128 
  129 void toe_connect_failed(struct toedev *, struct inpcb *, int);
  130 
  131 void toe_syncache_add(struct in_conninfo *, struct tcpopt *, struct tcphdr *,
  132     struct inpcb *, void *, void *);
  133 int  toe_syncache_expand(struct in_conninfo *, struct tcpopt *, struct tcphdr *,
  134     struct socket **);
  135 
  136 int toe_4tuple_check(struct in_conninfo *, struct tcphdr *, struct ifnet *);
  137 #endif

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