tcp_offload.c revision 180674
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 180674 2008-07-21 21:22:56Z 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 41#include <net/if.h> 42#include <net/if_types.h> 43#include <net/if_var.h> 44 45#include <netinet/in.h> 46#include <netinet/in_systm.h> 47#include <netinet/in_pcb.h> 48#include <netinet/tcp.h> 49#include <netinet/tcp_var.h> 50#include <netinet/tcp_offload.h> 51#include <netinet/toedev.h> 52 53int 54tcp_offload_connect(struct socket *so, struct sockaddr *nam) 55{ 56 struct ifnet *ifp; 57 struct toedev *tdev; 58 struct rtentry *rt; 59 int error; 60 61 /* 62 * Look up the route used for the connection to 63 * determine if it uses an interface capable of 64 * offloading the connection. 65 */ 66 rt = rtalloc1(nam, 1 /*report*/, 0 /*ignflags*/); 67 if (rt) 68 RT_UNLOCK(rt); 69 else 70 return (EHOSTUNREACH); 71 72 ifp = rt->rt_ifp; 73 if ((ifp->if_capenable & IFCAP_TOE) == 0) { 74 error = EINVAL; 75 goto fail; 76 } 77 78 tdev = TOEDEV(ifp); 79 if (tdev == NULL) { 80 error = EPERM; 81 goto fail; 82 } 83 84 if (tdev->tod_can_offload(tdev, so) == 0) { 85 error = EPERM; 86 goto fail; 87 } 88 89 return (tdev->tod_connect(tdev, so, rt, nam)); 90fail: 91 RTFREE(rt); 92 return (error); 93} 94 95 96/* 97 * This file contains code as a short-term staging area before it is moved in 98 * to sys/netinet/tcp_offload.c 99 */ 100 101void 102tcp_offload_twstart(struct tcpcb *tp) 103{ 104 105 INP_INFO_WLOCK(&tcbinfo); 106 INP_WLOCK(tp->t_inpcb); 107 tcp_twstart(tp); 108 INP_INFO_WUNLOCK(&tcbinfo); 109} 110 111struct tcpcb * 112tcp_offload_close(struct tcpcb *tp) 113{ 114 115 INP_INFO_WLOCK(&tcbinfo); 116 INP_WLOCK(tp->t_inpcb); 117 tp = tcp_close(tp); 118 INP_INFO_WUNLOCK(&tcbinfo); 119 if (tp) 120 INP_WUNLOCK(tp->t_inpcb); 121 122 return (tp); 123} 124 125struct tcpcb * 126tcp_offload_drop(struct tcpcb *tp, int error) 127{ 128 129 INP_INFO_WLOCK(&tcbinfo); 130 INP_WLOCK(tp->t_inpcb); 131 tp = tcp_drop(tp, error); 132 INP_INFO_WUNLOCK(&tcbinfo); 133 if (tp) 134 INP_WUNLOCK(tp->t_inpcb); 135 136 return (tp); 137} 138 139