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