1 /* 2 * Copyright (c) 2010, Oracle and/or its affiliates. All rights reserved. 3 */ 4 5 /* 6 * This file contains code imported from the OFED rds source file loop.c 7 * Oracle elects to have and use the contents of loop.c under and governed 8 * by the OpenIB.org BSD license (see below for full license text). However, 9 * the following notice accompanied the original version of this file: 10 */ 11 12 /* 13 * Copyright (c) 2006 Oracle. All rights reserved. 14 * 15 * This software is available to you under a choice of one of two 16 * licenses. You may choose to be licensed under the terms of the GNU 17 * General Public License (GPL) Version 2, available from the file 18 * COPYING in the main directory of this source tree, or the 19 * OpenIB.org BSD license below: 20 * 21 * Redistribution and use in source and binary forms, with or 22 * without modification, are permitted provided that the following 23 * conditions are met: 24 * 25 * - Redistributions of source code must retain the above 26 * copyright notice, this list of conditions and the following 27 * disclaimer. 28 * 29 * - Redistributions in binary form must reproduce the above 30 * copyright notice, this list of conditions and the following 31 * disclaimer in the documentation and/or other materials 32 * provided with the distribution. 33 * 34 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, 35 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF 36 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND 37 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS 38 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN 39 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN 40 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE 41 * SOFTWARE. 42 * 43 */ 44 #include <sys/rds.h> 45 46 #include <sys/ib/clients/rdsv3/rdsv3.h> 47 #include <sys/ib/clients/rdsv3/loop.h> 48 #include <sys/ib/clients/rdsv3/rdsv3_debug.h> 49 50 kmutex_t loop_conns_lock; 51 list_t loop_conns; 52 53 /* 54 * This 'loopback' transport is a special case for flows that originate 55 * and terminate on the same machine. 56 * 57 * Connection build-up notices if the destination address is thought of 58 * as a local address by a transport. At that time it decides to use the 59 * loopback transport instead of the bound transport of the sending socket. 60 * 61 * The loopback transport's sending path just hands the sent rds_message 62 * straight to the receiving path via an embedded rds_incoming. 63 */ 64 65 /* 66 * Usually a message transits both the sender and receiver's conns as it 67 * flows to the receiver. In the loopback case, though, the receive path 68 * is handed the sending conn so the sense of the addresses is reversed. 69 */ 70 static int 71 rdsv3_loop_xmit(struct rdsv3_connection *conn, struct rdsv3_message *rm, 72 unsigned int hdr_off, unsigned int sg, 73 unsigned int off) 74 { 75 /* Do not send cong updates to loopback */ 76 if (rm->m_inc.i_hdr.h_flags & RDSV3_FLAG_CONG_BITMAP) { 77 rdsv3_cong_map_updated(conn->c_fcong, ~(uint64_t)0); 78 return (sizeof (struct rdsv3_header) + RDSV3_CONG_MAP_BYTES); 79 } 80 ASSERT(!(hdr_off || sg || off)); 81 82 RDSV3_DPRINTF4("rdsv3_loop_xmit", "Enter(conn: %p, rm: %p)", conn, rm); 83 84 rdsv3_inc_init(&rm->m_inc, conn, conn->c_laddr); 85 /* For the embedded inc. Matching put is in loop_inc_free() */ 86 rdsv3_message_addref(rm); 87 88 rdsv3_recv_incoming(conn, conn->c_laddr, conn->c_faddr, &rm->m_inc, 89 KM_NOSLEEP); 90 91 rdsv3_send_drop_acked(conn, ntohll(rm->m_inc.i_hdr.h_sequence), 92 NULL); 93 94 rdsv3_inc_put(&rm->m_inc); 95 96 RDSV3_DPRINTF4("rdsv3_loop_xmit", "Return(conn: %p, rm: %p)", conn, rm); 97 98 return (sizeof (struct rdsv3_header) + 99 ntohl(rm->m_inc.i_hdr.h_len)); 100 } 101 102 /* 103 * See rds_loop_xmit(). Since our inc is embedded in the rm, we 104 * make sure the rm lives at least until the inc is done. 105 */ 106 static void 107 rdsv3_loop_inc_free(struct rdsv3_incoming *inc) 108 { 109 struct rdsv3_message *rm = container_of(inc, struct rdsv3_message, 110 m_inc); 111 rdsv3_message_put(rm); 112 } 113 114 static int 115 rdsv3_loop_xmit_cong_map(struct rdsv3_connection *conn, 116 struct rdsv3_cong_map *map, 117 unsigned long offset) 118 { 119 RDSV3_DPRINTF4("rdsv3_loop_xmit_cong_map", "Enter(conn: %p)", conn); 120 121 ASSERT(!offset); 122 ASSERT(map == conn->c_lcong); 123 124 rdsv3_cong_map_updated(conn->c_fcong, ~(uint64_t)0); 125 126 RDSV3_DPRINTF4("rdsv3_loop_xmit_cong_map", "Return(conn: %p)", conn); 127 128 return (sizeof (struct rdsv3_header) + RDSV3_CONG_MAP_BYTES); 129 } 130 131 /* we need to at least give the thread something to succeed */ 132 /* ARGSUSED */ 133 static int 134 rdsv3_loop_recv(struct rdsv3_connection *conn) 135 { 136 return (0); 137 } 138 139 struct rdsv3_loop_connection { 140 struct list_node loop_node; 141 struct rdsv3_connection *conn; 142 }; 143 144 /* 145 * Even the loopback transport needs to keep track of its connections, 146 * so it can call rdsv3_conn_destroy() on them on exit. N.B. there are 147 * 1+ loopback addresses (127.*.*.*) so it's not a bug to have 148 * multiple loopback conns allocated, although rather useless. 149 */ 150 /* ARGSUSED */ 151 static int 152 rdsv3_loop_conn_alloc(struct rdsv3_connection *conn, int gfp) 153 { 154 struct rdsv3_loop_connection *lc; 155 156 RDSV3_DPRINTF4("rdsv3_loop_conn_alloc", "Enter(conn: %p)", conn); 157 158 lc = kmem_zalloc(sizeof (struct rdsv3_loop_connection), KM_NOSLEEP); 159 if (!lc) 160 return (-ENOMEM); 161 162 list_link_init(&lc->loop_node); 163 lc->conn = conn; 164 conn->c_transport_data = lc; 165 166 mutex_enter(&loop_conns_lock); 167 list_insert_tail(&loop_conns, lc); 168 mutex_exit(&loop_conns_lock); 169 170 RDSV3_DPRINTF4("rdsv3_loop_conn_alloc", "Return(conn: %p)", conn); 171 172 return (0); 173 } 174 175 static void 176 rdsv3_loop_conn_free(void *arg) 177 { 178 struct rdsv3_loop_connection *lc = arg; 179 RDSV3_DPRINTF5("rdsv3_loop_conn_free", "lc %p\n", lc); 180 list_remove_node(&lc->loop_node); 181 kmem_free(lc, sizeof (struct rdsv3_loop_connection)); 182 } 183 184 static int 185 rdsv3_loop_conn_connect(struct rdsv3_connection *conn) 186 { 187 rdsv3_connect_complete(conn); 188 return (0); 189 } 190 191 /* ARGSUSED */ 192 static void 193 rdsv3_loop_conn_shutdown(struct rdsv3_connection *conn) 194 { 195 } 196 197 void 198 rdsv3_loop_exit(void) 199 { 200 struct rdsv3_loop_connection *lc, *_lc; 201 list_t tmp_list; 202 203 RDSV3_DPRINTF4("rdsv3_loop_exit", "Enter"); 204 205 list_create(&tmp_list, sizeof (struct rdsv3_loop_connection), 206 offsetof(struct rdsv3_loop_connection, loop_node)); 207 208 /* avoid calling conn_destroy with irqs off */ 209 mutex_enter(&loop_conns_lock); 210 list_splice(&loop_conns, &tmp_list); 211 mutex_exit(&loop_conns_lock); 212 213 RDSV3_FOR_EACH_LIST_NODE_SAFE(lc, _lc, &tmp_list, loop_node) { 214 ASSERT(!lc->conn->c_passive); 215 rdsv3_conn_destroy(lc->conn); 216 } 217 218 list_destroy(&loop_conns); 219 mutex_destroy(&loop_conns_lock); 220 221 RDSV3_DPRINTF4("rdsv3_loop_exit", "Return"); 222 } 223 224 /* 225 * This is missing .xmit_* because loop doesn't go through generic 226 * rdsv3_send_xmit() and doesn't call rdsv3_recv_incoming(). .listen_stop and 227 * .laddr_check are missing because transport.c doesn't iterate over 228 * rdsv3_loop_transport. 229 */ 230 #ifndef __lock_lint 231 struct rdsv3_transport rdsv3_loop_transport = { 232 .xmit = rdsv3_loop_xmit, 233 .xmit_cong_map = rdsv3_loop_xmit_cong_map, 234 .recv = rdsv3_loop_recv, 235 .conn_alloc = rdsv3_loop_conn_alloc, 236 .conn_free = rdsv3_loop_conn_free, 237 .conn_connect = rdsv3_loop_conn_connect, 238 .conn_shutdown = rdsv3_loop_conn_shutdown, 239 .inc_copy_to_user = rdsv3_message_inc_copy_to_user, 240 .inc_free = rdsv3_loop_inc_free, 241 .t_name = "loopback", 242 }; 243 #else 244 struct rdsv3_transport rdsv3_loop_transport; 245 #endif 246