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 <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 static struct rdma_cm_id *rds_rdma_listen_id; 41 42 int rds_rdma_cm_event_handler(struct rdma_cm_id *cm_id, 43 struct rdma_cm_event *event) 44 { 45 /* this can be null in the listening path */ 46 struct rds_connection *conn = cm_id->context; 47 struct rds_transport *trans; 48 int ret = 0; 49 50 rdsdebug("conn %p id %p handling event %u (%s)\n", conn, cm_id, 51 event->event, rdma_event_msg(event->event)); 52 53 if (cm_id->device->node_type == RDMA_NODE_IB_CA) 54 trans = &rds_ib_transport; 55 56 /* Prevent shutdown from tearing down the connection 57 * while we're executing. */ 58 if (conn) { 59 mutex_lock(&conn->c_cm_lock); 60 61 /* If the connection is being shut down, bail out 62 * right away. We return 0 so cm_id doesn't get 63 * destroyed prematurely */ 64 if (rds_conn_state(conn) == RDS_CONN_DISCONNECTING) { 65 /* Reject incoming connections while we're tearing 66 * down an existing one. */ 67 if (event->event == RDMA_CM_EVENT_CONNECT_REQUEST) 68 ret = 1; 69 goto out; 70 } 71 } 72 73 switch (event->event) { 74 case RDMA_CM_EVENT_CONNECT_REQUEST: 75 ret = trans->cm_handle_connect(cm_id, event); 76 break; 77 78 case RDMA_CM_EVENT_ADDR_RESOLVED: 79 /* XXX do we need to clean up if this fails? */ 80 ret = rdma_resolve_route(cm_id, 81 RDS_RDMA_RESOLVE_TIMEOUT_MS); 82 break; 83 84 case RDMA_CM_EVENT_ROUTE_RESOLVED: 85 /* Connection could have been dropped so make sure the 86 * cm_id is valid before proceeding 87 */ 88 if (conn) { 89 struct rds_ib_connection *ibic; 90 91 ibic = conn->c_transport_data; 92 if (ibic && ibic->i_cm_id == cm_id) 93 ret = trans->cm_initiate_connect(cm_id); 94 else 95 rds_conn_drop(conn); 96 } 97 break; 98 99 case RDMA_CM_EVENT_ESTABLISHED: 100 trans->cm_connect_complete(conn, event); 101 break; 102 103 case RDMA_CM_EVENT_REJECTED: 104 rdsdebug("Connection rejected: %s\n", 105 rdma_reject_msg(cm_id, event->status)); 106 /* FALLTHROUGH */ 107 case RDMA_CM_EVENT_ADDR_ERROR: 108 case RDMA_CM_EVENT_ROUTE_ERROR: 109 case RDMA_CM_EVENT_CONNECT_ERROR: 110 case RDMA_CM_EVENT_UNREACHABLE: 111 case RDMA_CM_EVENT_DEVICE_REMOVAL: 112 case RDMA_CM_EVENT_ADDR_CHANGE: 113 if (conn) 114 rds_conn_drop(conn); 115 break; 116 117 case RDMA_CM_EVENT_DISCONNECTED: 118 rdsdebug("DISCONNECT event - dropping connection " 119 "%pI4->%pI4\n", &conn->c_laddr, 120 &conn->c_faddr); 121 rds_conn_drop(conn); 122 break; 123 124 case RDMA_CM_EVENT_TIMEWAIT_EXIT: 125 if (conn) { 126 pr_info("RDS: RDMA_CM_EVENT_TIMEWAIT_EXIT event: dropping connection %pI4->%pI4\n", 127 &conn->c_laddr, &conn->c_faddr); 128 rds_conn_drop(conn); 129 } 130 break; 131 132 default: 133 /* things like device disconnect? */ 134 printk(KERN_ERR "RDS: unknown event %u (%s)!\n", 135 event->event, rdma_event_msg(event->event)); 136 break; 137 } 138 139 out: 140 if (conn) 141 mutex_unlock(&conn->c_cm_lock); 142 143 rdsdebug("id %p event %u (%s) handling ret %d\n", cm_id, event->event, 144 rdma_event_msg(event->event), ret); 145 146 return ret; 147 } 148 149 static int rds_rdma_listen_init(void) 150 { 151 struct sockaddr_in sin; 152 struct rdma_cm_id *cm_id; 153 int ret; 154 155 cm_id = rdma_create_id(&init_net, rds_rdma_cm_event_handler, NULL, 156 RDMA_PS_TCP, IB_QPT_RC); 157 if (IS_ERR(cm_id)) { 158 ret = PTR_ERR(cm_id); 159 printk(KERN_ERR "RDS/RDMA: failed to setup listener, " 160 "rdma_create_id() returned %d\n", ret); 161 return ret; 162 } 163 164 sin.sin_family = AF_INET; 165 sin.sin_addr.s_addr = (__force u32)htonl(INADDR_ANY); 166 sin.sin_port = (__force u16)htons(RDS_PORT); 167 168 /* 169 * XXX I bet this binds the cm_id to a device. If we want to support 170 * fail-over we'll have to take this into consideration. 171 */ 172 ret = rdma_bind_addr(cm_id, (struct sockaddr *)&sin); 173 if (ret) { 174 printk(KERN_ERR "RDS/RDMA: failed to setup listener, " 175 "rdma_bind_addr() returned %d\n", ret); 176 goto out; 177 } 178 179 ret = rdma_listen(cm_id, 128); 180 if (ret) { 181 printk(KERN_ERR "RDS/RDMA: failed to setup listener, " 182 "rdma_listen() returned %d\n", ret); 183 goto out; 184 } 185 186 rdsdebug("cm %p listening on port %u\n", cm_id, RDS_PORT); 187 188 rds_rdma_listen_id = cm_id; 189 cm_id = NULL; 190 out: 191 if (cm_id) 192 rdma_destroy_id(cm_id); 193 return ret; 194 } 195 196 static void rds_rdma_listen_stop(void) 197 { 198 if (rds_rdma_listen_id) { 199 rdsdebug("cm %p\n", rds_rdma_listen_id); 200 rdma_destroy_id(rds_rdma_listen_id); 201 rds_rdma_listen_id = NULL; 202 } 203 } 204 205 static int rds_rdma_init(void) 206 { 207 int ret; 208 209 ret = rds_ib_init(); 210 if (ret) 211 goto out; 212 213 ret = rds_rdma_listen_init(); 214 if (ret) 215 rds_ib_exit(); 216 out: 217 return ret; 218 } 219 module_init(rds_rdma_init); 220 221 static void rds_rdma_exit(void) 222 { 223 /* stop listening first to ensure no new connections are attempted */ 224 rds_rdma_listen_stop(); 225 rds_ib_exit(); 226 } 227 module_exit(rds_rdma_exit); 228 229 MODULE_AUTHOR("Oracle Corporation <rds-devel@oss.oracle.com>"); 230 MODULE_DESCRIPTION("RDS: IB transport"); 231 MODULE_LICENSE("Dual BSD/GPL"); 232 233