tcp_offload.c revision 182591
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: head/sys/netinet/tcp_offload.c 182591 2008-09-01 05:30:22Z 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#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 54uint32_t toedev_registration_count; 55 56int 57tcp_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)); 96fail: 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 107void 108tcp_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 117struct tcpcb * 118tcp_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 131struct tcpcb * 132tcp_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} 144 145