1 /* 2 * CDDL HEADER START 3 * 4 * The contents of this file are subject to the terms of the 5 * Common Development and Distribution License (the "License"). 6 * You may not use this file except in compliance with the License. 7 * 8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 9 * or http://www.opensolaris.org/os/licensing. 10 * See the License for the specific language governing permissions 11 * and limitations under the License. 12 * 13 * When distributing Covered Code, include this CDDL HEADER in each 14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 15 * If applicable, add the following below this CDDL HEADER, with the 16 * fields enclosed by brackets "[]" replaced with your own identifying 17 * information: Portions Copyright [yyyy] [name of copyright owner] 18 * 19 * CDDL HEADER END 20 */ 21 /* 22 * Copyright (c) 2010, Oracle and/or its affiliates. All rights reserved. 23 */ 24 25 /* 26 * Copyright (c) 2006 Oracle. All rights reserved. 27 * 28 * This software is available to you under a choice of one of two 29 * licenses. You may choose to be licensed under the terms of the GNU 30 * General Public License (GPL) Version 2, available from the file 31 * COPYING in the main directory of this source tree, or the 32 * OpenIB.org BSD license below: 33 * 34 * Redistribution and use in source and binary forms, with or 35 * without modification, are permitted provided that the following 36 * conditions are met: 37 * 38 * - Redistributions of source code must retain the above 39 * copyright notice, this list of conditions and the following 40 * disclaimer. 41 * 42 * - Redistributions in binary form must reproduce the above 43 * copyright notice, this list of conditions and the following 44 * disclaimer in the documentation and/or other materials 45 * provided with the distribution. 46 * 47 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, 48 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF 49 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND 50 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS 51 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN 52 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN 53 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE 54 * SOFTWARE. 55 * 56 */ 57 #include <sys/rds.h> 58 59 #include <sys/ib/clients/rdsv3/rdsv3.h> 60 #include <sys/ib/clients/rdsv3/loop.h> 61 #include <sys/ib/clients/rdsv3/rdsv3_debug.h> 62 63 kmutex_t loop_conns_lock; 64 list_t loop_conns; 65 66 /* 67 * This 'loopback' transport is a special case for flows that originate 68 * and terminate on the same machine. 69 * 70 * Connection build-up notices if the destination address is thought of 71 * as a local address by a transport. At that time it decides to use the 72 * loopback transport instead of the bound transport of the sending socket. 73 * 74 * The loopback transport's sending path just hands the sent rds_message 75 * straight to the receiving path via an embedded rds_incoming. 76 */ 77 78 /* 79 * Usually a message transits both the sender and receiver's conns as it 80 * flows to the receiver. In the loopback case, though, the receive path 81 * is handed the sending conn so the sense of the addresses is reversed. 82 */ 83 static int 84 rdsv3_loop_xmit(struct rdsv3_connection *conn, struct rdsv3_message *rm, 85 unsigned int hdr_off, unsigned int sg, 86 unsigned int off) 87 { 88 ASSERT(!(hdr_off || sg || off)); 89 90 RDSV3_DPRINTF4("rdsv3_loop_xmit", "Enter(conn: %p, rm: %p)", conn, rm); 91 92 rdsv3_inc_init(&rm->m_inc, conn, conn->c_laddr); 93 rdsv3_message_addref(rm); /* for the inc */ 94 95 rdsv3_recv_incoming(conn, conn->c_laddr, conn->c_faddr, &rm->m_inc, 96 KM_NOSLEEP); 97 98 rdsv3_send_drop_acked(conn, ntohll(rm->m_inc.i_hdr.h_sequence), 99 NULL); 100 101 rdsv3_inc_put(&rm->m_inc); 102 103 RDSV3_DPRINTF4("rdsv3_loop_xmit", "Return(conn: %p, rm: %p)", conn, rm); 104 105 return (sizeof (struct rdsv3_header) + 106 ntohl(rm->m_inc.i_hdr.h_len)); 107 } 108 109 static int 110 rdsv3_loop_xmit_cong_map(struct rdsv3_connection *conn, 111 struct rdsv3_cong_map *map, 112 unsigned long offset) 113 { 114 RDSV3_DPRINTF4("rdsv3_loop_xmit_cong_map", "Enter(conn: %p)", conn); 115 116 ASSERT(!offset); 117 ASSERT(map == conn->c_lcong); 118 119 rdsv3_cong_map_updated(conn->c_fcong, ~(uint64_t)0); 120 121 RDSV3_DPRINTF4("rdsv3_loop_xmit_cong_map", "Return(conn: %p)", conn); 122 123 return (sizeof (struct rdsv3_header) + RDSV3_CONG_MAP_BYTES); 124 } 125 126 /* we need to at least give the thread something to succeed */ 127 /* ARGSUSED */ 128 static int 129 rdsv3_loop_recv(struct rdsv3_connection *conn) 130 { 131 return (0); 132 } 133 134 struct rdsv3_loop_connection { 135 struct list_node loop_node; 136 struct rdsv3_connection *conn; 137 }; 138 139 /* 140 * Even the loopback transport needs to keep track of its connections, 141 * so it can call rdsv3_conn_destroy() on them on exit. N.B. there are 142 * 1+ loopback addresses (127.*.*.*) so it's not a bug to have 143 * multiple loopback conns allocated, although rather useless. 144 */ 145 /* ARGSUSED */ 146 static int 147 rdsv3_loop_conn_alloc(struct rdsv3_connection *conn, int gfp) 148 { 149 struct rdsv3_loop_connection *lc; 150 151 RDSV3_DPRINTF4("rdsv3_loop_conn_alloc", "Enter(conn: %p)", conn); 152 153 lc = kmem_zalloc(sizeof (struct rdsv3_loop_connection), KM_NOSLEEP); 154 if (lc == NULL) 155 return (-ENOMEM); 156 157 list_link_init(&lc->loop_node); 158 lc->conn = conn; 159 conn->c_transport_data = lc; 160 161 mutex_enter(&loop_conns_lock); 162 list_insert_tail(&loop_conns, lc); 163 mutex_exit(&loop_conns_lock); 164 165 RDSV3_DPRINTF4("rdsv3_loop_conn_alloc", "Return(conn: %p)", conn); 166 167 return (0); 168 } 169 170 static void 171 rdsv3_loop_conn_free(void *arg) 172 { 173 struct rdsv3_loop_connection *lc = arg; 174 RDSV3_DPRINTF5("rdsv3_loop_conn_free", "lc %p\n", lc); 175 list_remove_node(&lc->loop_node); 176 kmem_free(lc, sizeof (struct rdsv3_loop_connection)); 177 } 178 179 static int 180 rdsv3_loop_conn_connect(struct rdsv3_connection *conn) 181 { 182 rdsv3_connect_complete(conn); 183 return (0); 184 } 185 186 /* ARGSUSED */ 187 static void 188 rdsv3_loop_conn_shutdown(struct rdsv3_connection *conn) 189 { 190 } 191 192 void 193 rdsv3_loop_exit(void) 194 { 195 struct rdsv3_loop_connection *lc, *_lc; 196 list_t tmp_list; 197 198 RDSV3_DPRINTF4("rdsv3_loop_exit", "Enter"); 199 200 list_create(&tmp_list, sizeof (struct rdsv3_loop_connection), 201 offsetof(struct rdsv3_loop_connection, loop_node)); 202 203 /* avoid calling conn_destroy with irqs off */ 204 mutex_enter(&loop_conns_lock); 205 list_splice(&loop_conns, &tmp_list); 206 mutex_exit(&loop_conns_lock); 207 208 RDSV3_FOR_EACH_LIST_NODE_SAFE(lc, _lc, &tmp_list, loop_node) { 209 ASSERT(!lc->conn->c_passive); 210 rdsv3_conn_destroy(lc->conn); 211 } 212 213 list_destroy(&loop_conns); 214 mutex_destroy(&loop_conns_lock); 215 216 RDSV3_DPRINTF4("rdsv3_loop_exit", "Return"); 217 } 218 219 /* 220 * This is missing .xmit_* because loop doesn't go through generic 221 * rdsv3_send_xmit() and doesn't call rdsv3_recv_incoming(). .listen_stop and 222 * .laddr_check are missing because transport.c doesn't iterate over 223 * rdsv3_loop_transport. 224 */ 225 #ifndef __lock_lint 226 struct rdsv3_transport rdsv3_loop_transport = { 227 .xmit = rdsv3_loop_xmit, 228 .xmit_cong_map = rdsv3_loop_xmit_cong_map, 229 .recv = rdsv3_loop_recv, 230 .conn_alloc = rdsv3_loop_conn_alloc, 231 .conn_free = rdsv3_loop_conn_free, 232 .conn_connect = rdsv3_loop_conn_connect, 233 .conn_shutdown = rdsv3_loop_conn_shutdown, 234 .inc_copy_to_user = rdsv3_message_inc_copy_to_user, 235 .inc_purge = rdsv3_message_inc_purge, 236 .inc_free = rdsv3_message_inc_free, 237 .t_name = "loopback", 238 }; 239 #else 240 struct rdsv3_transport rdsv3_loop_transport; 241 #endif 242