1 /* 2 * Copyright (c) 2009, 2018 Oracle and/or its affiliates. All rights reserved. 3 * 4 * This software is available to you under a choice of one of two 5 * licenses. You may choose to be licensed under the terms of the GNU 6 * General Public License (GPL) Version 2, available from the file 7 * COPYING in the main directory of this source tree, or the 8 * OpenIB.org BSD license below: 9 * 10 * Redistribution and use in source and binary forms, with or 11 * without modification, are permitted provided that the following 12 * conditions are met: 13 * 14 * - Redistributions of source code must retain the above 15 * copyright notice, this list of conditions and the following 16 * disclaimer. 17 * 18 * - Redistributions in binary form must reproduce the above 19 * copyright notice, this list of conditions and the following 20 * disclaimer in the documentation and/or other materials 21 * provided with the distribution. 22 * 23 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, 24 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF 25 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND 26 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS 27 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN 28 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN 29 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE 30 * SOFTWARE. 31 * 32 */ 33 #include <linux/module.h> 34 #include <rdma/rdma_cm.h> 35 36 #include "rds_single_path.h" 37 #include "rdma_transport.h" 38 #include "ib.h" 39 40 /* Global IPv4 and IPv6 RDS RDMA listener cm_id */ 41 static struct rdma_cm_id *rds_rdma_listen_id; 42 #if IS_ENABLED(CONFIG_IPV6) 43 static struct rdma_cm_id *rds6_rdma_listen_id; 44 #endif 45 46 /* Per IB specification 7.7.3, service level is a 4-bit field. */ 47 #define TOS_TO_SL(tos) ((tos) & 0xF) 48 49 static int rds_rdma_cm_event_handler_cmn(struct rdma_cm_id *cm_id, 50 struct rdma_cm_event *event, 51 bool isv6) 52 { 53 /* this can be null in the listening path */ 54 struct rds_connection *conn = cm_id->context; 55 struct rds_transport *trans; 56 int ret = 0; 57 int *err; 58 u8 len; 59 60 rdsdebug("conn %p id %p handling event %u (%s)\n", conn, cm_id, 61 event->event, rdma_event_msg(event->event)); 62 63 if (cm_id->device->node_type == RDMA_NODE_IB_CA) 64 trans = &rds_ib_transport; 65 66 /* Prevent shutdown from tearing down the connection 67 * while we're executing. */ 68 if (conn) { 69 mutex_lock(&conn->c_cm_lock); 70 71 /* If the connection is being shut down, bail out 72 * right away. We return 0 so cm_id doesn't get 73 * destroyed prematurely */ 74 if (rds_conn_state(conn) == RDS_CONN_DISCONNECTING) { 75 /* Reject incoming connections while we're tearing 76 * down an existing one. */ 77 if (event->event == RDMA_CM_EVENT_CONNECT_REQUEST) 78 ret = 1; 79 goto out; 80 } 81 } 82 83 switch (event->event) { 84 case RDMA_CM_EVENT_CONNECT_REQUEST: 85 ret = trans->cm_handle_connect(cm_id, event, isv6); 86 break; 87 88 case RDMA_CM_EVENT_ADDR_RESOLVED: 89 rdma_set_service_type(cm_id, conn->c_tos); 90 rdma_set_min_rnr_timer(cm_id, IB_RNR_TIMER_000_32); 91 /* XXX do we need to clean up if this fails? */ 92 ret = rdma_resolve_route(cm_id, 93 RDS_RDMA_RESOLVE_TIMEOUT_MS); 94 break; 95 96 case RDMA_CM_EVENT_ROUTE_RESOLVED: 97 /* Connection could have been dropped so make sure the 98 * cm_id is valid before proceeding 99 */ 100 if (conn) { 101 struct rds_ib_connection *ibic; 102 103 ibic = conn->c_transport_data; 104 if (ibic && ibic->i_cm_id == cm_id) { 105 cm_id->route.path_rec[0].sl = 106 TOS_TO_SL(conn->c_tos); 107 ret = trans->cm_initiate_connect(cm_id, isv6); 108 } else { 109 rds_conn_drop(conn); 110 } 111 } 112 break; 113 114 case RDMA_CM_EVENT_ESTABLISHED: 115 if (conn) 116 trans->cm_connect_complete(conn, event); 117 break; 118 119 case RDMA_CM_EVENT_REJECTED: 120 if (!conn) 121 break; 122 err = (int *)rdma_consumer_reject_data(cm_id, event, &len); 123 if (!err || 124 (err && len >= sizeof(*err) && 125 ((*err) <= RDS_RDMA_REJ_INCOMPAT))) { 126 pr_warn("RDS/RDMA: conn <%pI6c, %pI6c> rejected, dropping connection\n", 127 &conn->c_laddr, &conn->c_faddr); 128 129 if (!conn->c_tos) 130 conn->c_proposed_version = RDS_PROTOCOL_COMPAT_VERSION; 131 132 rds_conn_drop(conn); 133 } 134 rdsdebug("Connection rejected: %s\n", 135 rdma_reject_msg(cm_id, event->status)); 136 break; 137 case RDMA_CM_EVENT_ADDR_ERROR: 138 case RDMA_CM_EVENT_ROUTE_ERROR: 139 case RDMA_CM_EVENT_CONNECT_ERROR: 140 case RDMA_CM_EVENT_UNREACHABLE: 141 case RDMA_CM_EVENT_DEVICE_REMOVAL: 142 case RDMA_CM_EVENT_ADDR_CHANGE: 143 if (conn) 144 rds_conn_drop(conn); 145 break; 146 147 case RDMA_CM_EVENT_DISCONNECTED: 148 if (!conn) 149 break; 150 rdsdebug("DISCONNECT event - dropping connection " 151 "%pI6c->%pI6c\n", &conn->c_laddr, 152 &conn->c_faddr); 153 rds_conn_drop(conn); 154 break; 155 156 case RDMA_CM_EVENT_TIMEWAIT_EXIT: 157 if (conn) { 158 pr_info("RDS: RDMA_CM_EVENT_TIMEWAIT_EXIT event: dropping connection %pI6c->%pI6c\n", 159 &conn->c_laddr, &conn->c_faddr); 160 rds_conn_drop(conn); 161 } 162 break; 163 164 default: 165 /* things like device disconnect? */ 166 printk(KERN_ERR "RDS: unknown event %u (%s)!\n", 167 event->event, rdma_event_msg(event->event)); 168 break; 169 } 170 171 out: 172 if (conn) 173 mutex_unlock(&conn->c_cm_lock); 174 175 rdsdebug("id %p event %u (%s) handling ret %d\n", cm_id, event->event, 176 rdma_event_msg(event->event), ret); 177 178 return ret; 179 } 180 181 int rds_rdma_cm_event_handler(struct rdma_cm_id *cm_id, 182 struct rdma_cm_event *event) 183 { 184 return rds_rdma_cm_event_handler_cmn(cm_id, event, false); 185 } 186 187 #if IS_ENABLED(CONFIG_IPV6) 188 int rds6_rdma_cm_event_handler(struct rdma_cm_id *cm_id, 189 struct rdma_cm_event *event) 190 { 191 return rds_rdma_cm_event_handler_cmn(cm_id, event, true); 192 } 193 #endif 194 195 static int rds_rdma_listen_init_common(rdma_cm_event_handler handler, 196 struct sockaddr *sa, 197 struct rdma_cm_id **ret_cm_id) 198 { 199 struct rdma_cm_id *cm_id; 200 int ret; 201 202 cm_id = rdma_create_id(&init_net, handler, NULL, 203 RDMA_PS_TCP, IB_QPT_RC); 204 if (IS_ERR(cm_id)) { 205 ret = PTR_ERR(cm_id); 206 printk(KERN_ERR "RDS/RDMA: failed to setup listener, " 207 "rdma_create_id() returned %d\n", ret); 208 return ret; 209 } 210 211 /* 212 * XXX I bet this binds the cm_id to a device. If we want to support 213 * fail-over we'll have to take this into consideration. 214 */ 215 ret = rdma_bind_addr(cm_id, sa); 216 if (ret) { 217 printk(KERN_ERR "RDS/RDMA: failed to setup listener, " 218 "rdma_bind_addr() returned %d\n", ret); 219 goto out; 220 } 221 222 ret = rdma_listen(cm_id, 128); 223 if (ret) { 224 printk(KERN_ERR "RDS/RDMA: failed to setup listener, " 225 "rdma_listen() returned %d\n", ret); 226 goto out; 227 } 228 229 rdsdebug("cm %p listening on port %u\n", cm_id, RDS_PORT); 230 231 *ret_cm_id = cm_id; 232 cm_id = NULL; 233 out: 234 if (cm_id) 235 rdma_destroy_id(cm_id); 236 return ret; 237 } 238 239 /* Initialize the RDS RDMA listeners. We create two listeners for 240 * compatibility reason. The one on RDS_PORT is used for IPv4 241 * requests only. The one on RDS_CM_PORT is used for IPv6 requests 242 * only. So only IPv6 enabled RDS module will communicate using this 243 * port. 244 */ 245 static int rds_rdma_listen_init(void) 246 { 247 int ret; 248 #if IS_ENABLED(CONFIG_IPV6) 249 struct sockaddr_in6 sin6; 250 #endif 251 struct sockaddr_in sin; 252 253 sin.sin_family = PF_INET; 254 sin.sin_addr.s_addr = htonl(INADDR_ANY); 255 sin.sin_port = htons(RDS_PORT); 256 ret = rds_rdma_listen_init_common(rds_rdma_cm_event_handler, 257 (struct sockaddr *)&sin, 258 &rds_rdma_listen_id); 259 if (ret != 0) 260 return ret; 261 262 #if IS_ENABLED(CONFIG_IPV6) 263 sin6.sin6_family = PF_INET6; 264 sin6.sin6_addr = in6addr_any; 265 sin6.sin6_port = htons(RDS_CM_PORT); 266 sin6.sin6_scope_id = 0; 267 sin6.sin6_flowinfo = 0; 268 ret = rds_rdma_listen_init_common(rds6_rdma_cm_event_handler, 269 (struct sockaddr *)&sin6, 270 &rds6_rdma_listen_id); 271 /* Keep going even when IPv6 is not enabled in the system. */ 272 if (ret != 0) 273 rdsdebug("Cannot set up IPv6 RDMA listener\n"); 274 #endif 275 return 0; 276 } 277 278 static void rds_rdma_listen_stop(void) 279 { 280 if (rds_rdma_listen_id) { 281 rdsdebug("cm %p\n", rds_rdma_listen_id); 282 rdma_destroy_id(rds_rdma_listen_id); 283 rds_rdma_listen_id = NULL; 284 } 285 #if IS_ENABLED(CONFIG_IPV6) 286 if (rds6_rdma_listen_id) { 287 rdsdebug("cm %p\n", rds6_rdma_listen_id); 288 rdma_destroy_id(rds6_rdma_listen_id); 289 rds6_rdma_listen_id = NULL; 290 } 291 #endif 292 } 293 294 static int rds_rdma_init(void) 295 { 296 int ret; 297 298 ret = rds_ib_init(); 299 if (ret) 300 goto out; 301 302 ret = rds_rdma_listen_init(); 303 if (ret) 304 rds_ib_exit(); 305 out: 306 return ret; 307 } 308 module_init(rds_rdma_init); 309 310 static void rds_rdma_exit(void) 311 { 312 /* stop listening first to ensure no new connections are attempted */ 313 rds_rdma_listen_stop(); 314 rds_ib_exit(); 315 } 316 module_exit(rds_rdma_exit); 317 318 MODULE_AUTHOR("Oracle Corporation <rds-devel@oss.oracle.com>"); 319 MODULE_DESCRIPTION("RDS: IB transport"); 320 MODULE_LICENSE("Dual BSD/GPL"); 321