1 /* 2 * Copyright (c) 2009 Oracle. 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 <rdma/rdma_cm.h> 34 35 #include "rdma_transport.h" 36 37 static struct rdma_cm_id *rds_rdma_listen_id; 38 39 static char *rds_cm_event_strings[] = { 40 #define RDS_CM_EVENT_STRING(foo) \ 41 [RDMA_CM_EVENT_##foo] = __stringify(RDMA_CM_EVENT_##foo) 42 RDS_CM_EVENT_STRING(ADDR_RESOLVED), 43 RDS_CM_EVENT_STRING(ADDR_ERROR), 44 RDS_CM_EVENT_STRING(ROUTE_RESOLVED), 45 RDS_CM_EVENT_STRING(ROUTE_ERROR), 46 RDS_CM_EVENT_STRING(CONNECT_REQUEST), 47 RDS_CM_EVENT_STRING(CONNECT_RESPONSE), 48 RDS_CM_EVENT_STRING(CONNECT_ERROR), 49 RDS_CM_EVENT_STRING(UNREACHABLE), 50 RDS_CM_EVENT_STRING(REJECTED), 51 RDS_CM_EVENT_STRING(ESTABLISHED), 52 RDS_CM_EVENT_STRING(DISCONNECTED), 53 RDS_CM_EVENT_STRING(DEVICE_REMOVAL), 54 RDS_CM_EVENT_STRING(MULTICAST_JOIN), 55 RDS_CM_EVENT_STRING(MULTICAST_ERROR), 56 RDS_CM_EVENT_STRING(ADDR_CHANGE), 57 RDS_CM_EVENT_STRING(TIMEWAIT_EXIT), 58 #undef RDS_CM_EVENT_STRING 59 }; 60 61 static char *rds_cm_event_str(enum rdma_cm_event_type type) 62 { 63 return rds_str_array(rds_cm_event_strings, 64 ARRAY_SIZE(rds_cm_event_strings), type); 65 }; 66 67 int rds_rdma_cm_event_handler(struct rdma_cm_id *cm_id, 68 struct rdma_cm_event *event) 69 { 70 /* this can be null in the listening path */ 71 struct rds_connection *conn = cm_id->context; 72 struct rds_transport *trans; 73 int ret = 0; 74 75 rdsdebug("conn %p id %p handling event %u (%s)\n", conn, cm_id, 76 event->event, rds_cm_event_str(event->event)); 77 78 if (cm_id->device->node_type == RDMA_NODE_RNIC) 79 trans = &rds_iw_transport; 80 else 81 trans = &rds_ib_transport; 82 83 /* Prevent shutdown from tearing down the connection 84 * while we're executing. */ 85 if (conn) { 86 mutex_lock(&conn->c_cm_lock); 87 88 /* If the connection is being shut down, bail out 89 * right away. We return 0 so cm_id doesn't get 90 * destroyed prematurely */ 91 if (rds_conn_state(conn) == RDS_CONN_DISCONNECTING) { 92 /* Reject incoming connections while we're tearing 93 * down an existing one. */ 94 if (event->event == RDMA_CM_EVENT_CONNECT_REQUEST) 95 ret = 1; 96 goto out; 97 } 98 } 99 100 switch (event->event) { 101 case RDMA_CM_EVENT_CONNECT_REQUEST: 102 ret = trans->cm_handle_connect(cm_id, event); 103 break; 104 105 case RDMA_CM_EVENT_ADDR_RESOLVED: 106 /* XXX do we need to clean up if this fails? */ 107 ret = rdma_resolve_route(cm_id, 108 RDS_RDMA_RESOLVE_TIMEOUT_MS); 109 break; 110 111 case RDMA_CM_EVENT_ROUTE_RESOLVED: 112 /* XXX worry about racing with listen acceptance */ 113 ret = trans->cm_initiate_connect(cm_id); 114 break; 115 116 case RDMA_CM_EVENT_ESTABLISHED: 117 trans->cm_connect_complete(conn, event); 118 break; 119 120 case RDMA_CM_EVENT_ADDR_ERROR: 121 case RDMA_CM_EVENT_ROUTE_ERROR: 122 case RDMA_CM_EVENT_CONNECT_ERROR: 123 case RDMA_CM_EVENT_UNREACHABLE: 124 case RDMA_CM_EVENT_REJECTED: 125 case RDMA_CM_EVENT_DEVICE_REMOVAL: 126 case RDMA_CM_EVENT_ADDR_CHANGE: 127 if (conn) 128 rds_conn_drop(conn); 129 break; 130 131 case RDMA_CM_EVENT_DISCONNECTED: 132 rdsdebug("DISCONNECT event - dropping connection " 133 "%pI4->%pI4\n", &conn->c_laddr, 134 &conn->c_faddr); 135 rds_conn_drop(conn); 136 break; 137 138 default: 139 /* things like device disconnect? */ 140 printk(KERN_ERR "RDS: unknown event %u (%s)!\n", 141 event->event, rds_cm_event_str(event->event)); 142 break; 143 } 144 145 out: 146 if (conn) 147 mutex_unlock(&conn->c_cm_lock); 148 149 rdsdebug("id %p event %u (%s) handling ret %d\n", cm_id, event->event, 150 rds_cm_event_str(event->event), ret); 151 152 return ret; 153 } 154 155 static int rds_rdma_listen_init(void) 156 { 157 struct sockaddr_in sin; 158 struct rdma_cm_id *cm_id; 159 int ret; 160 161 cm_id = rdma_create_id(rds_rdma_cm_event_handler, NULL, RDMA_PS_TCP); 162 if (IS_ERR(cm_id)) { 163 ret = PTR_ERR(cm_id); 164 printk(KERN_ERR "RDS/RDMA: failed to setup listener, " 165 "rdma_create_id() returned %d\n", ret); 166 return ret; 167 } 168 169 sin.sin_family = AF_INET, 170 sin.sin_addr.s_addr = (__force u32)htonl(INADDR_ANY); 171 sin.sin_port = (__force u16)htons(RDS_PORT); 172 173 /* 174 * XXX I bet this binds the cm_id to a device. If we want to support 175 * fail-over we'll have to take this into consideration. 176 */ 177 ret = rdma_bind_addr(cm_id, (struct sockaddr *)&sin); 178 if (ret) { 179 printk(KERN_ERR "RDS/RDMA: failed to setup listener, " 180 "rdma_bind_addr() returned %d\n", ret); 181 goto out; 182 } 183 184 ret = rdma_listen(cm_id, 128); 185 if (ret) { 186 printk(KERN_ERR "RDS/RDMA: failed to setup listener, " 187 "rdma_listen() returned %d\n", ret); 188 goto out; 189 } 190 191 rdsdebug("cm %p listening on port %u\n", cm_id, RDS_PORT); 192 193 rds_rdma_listen_id = cm_id; 194 cm_id = NULL; 195 out: 196 if (cm_id) 197 rdma_destroy_id(cm_id); 198 return ret; 199 } 200 201 static void rds_rdma_listen_stop(void) 202 { 203 if (rds_rdma_listen_id) { 204 rdsdebug("cm %p\n", rds_rdma_listen_id); 205 rdma_destroy_id(rds_rdma_listen_id); 206 rds_rdma_listen_id = NULL; 207 } 208 } 209 210 static int rds_rdma_init(void) 211 { 212 int ret; 213 214 ret = rds_rdma_listen_init(); 215 if (ret) 216 goto out; 217 218 ret = rds_iw_init(); 219 if (ret) 220 goto err_iw_init; 221 222 ret = rds_ib_init(); 223 if (ret) 224 goto err_ib_init; 225 226 goto out; 227 228 err_ib_init: 229 rds_iw_exit(); 230 err_iw_init: 231 rds_rdma_listen_stop(); 232 out: 233 return ret; 234 } 235 module_init(rds_rdma_init); 236 237 static void rds_rdma_exit(void) 238 { 239 /* stop listening first to ensure no new connections are attempted */ 240 rds_rdma_listen_stop(); 241 rds_ib_exit(); 242 rds_iw_exit(); 243 } 244 module_exit(rds_rdma_exit); 245 246 MODULE_AUTHOR("Oracle Corporation <rds-devel@oss.oracle.com>"); 247 MODULE_DESCRIPTION("RDS: IB/iWARP transport"); 248 MODULE_LICENSE("Dual BSD/GPL"); 249 250