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_ADDR_ERROR: 104 case RDMA_CM_EVENT_ROUTE_ERROR: 105 case RDMA_CM_EVENT_CONNECT_ERROR: 106 case RDMA_CM_EVENT_UNREACHABLE: 107 case RDMA_CM_EVENT_REJECTED: 108 case RDMA_CM_EVENT_DEVICE_REMOVAL: 109 case RDMA_CM_EVENT_ADDR_CHANGE: 110 if (conn) 111 rds_conn_drop(conn); 112 break; 113 114 case RDMA_CM_EVENT_DISCONNECTED: 115 rdsdebug("DISCONNECT event - dropping connection " 116 "%pI4->%pI4\n", &conn->c_laddr, 117 &conn->c_faddr); 118 rds_conn_drop(conn); 119 break; 120 121 case RDMA_CM_EVENT_TIMEWAIT_EXIT: 122 if (conn) { 123 pr_info("RDS: RDMA_CM_EVENT_TIMEWAIT_EXIT event: dropping connection %pI4->%pI4\n", 124 &conn->c_laddr, &conn->c_faddr); 125 rds_conn_drop(conn); 126 } 127 break; 128 129 default: 130 /* things like device disconnect? */ 131 printk(KERN_ERR "RDS: unknown event %u (%s)!\n", 132 event->event, rdma_event_msg(event->event)); 133 break; 134 } 135 136 out: 137 if (conn) 138 mutex_unlock(&conn->c_cm_lock); 139 140 rdsdebug("id %p event %u (%s) handling ret %d\n", cm_id, event->event, 141 rdma_event_msg(event->event), ret); 142 143 return ret; 144 } 145 146 static int rds_rdma_listen_init(void) 147 { 148 struct sockaddr_in sin; 149 struct rdma_cm_id *cm_id; 150 int ret; 151 152 cm_id = rdma_create_id(&init_net, rds_rdma_cm_event_handler, NULL, 153 RDMA_PS_TCP, IB_QPT_RC); 154 if (IS_ERR(cm_id)) { 155 ret = PTR_ERR(cm_id); 156 printk(KERN_ERR "RDS/RDMA: failed to setup listener, " 157 "rdma_create_id() returned %d\n", ret); 158 return ret; 159 } 160 161 sin.sin_family = AF_INET; 162 sin.sin_addr.s_addr = (__force u32)htonl(INADDR_ANY); 163 sin.sin_port = (__force u16)htons(RDS_PORT); 164 165 /* 166 * XXX I bet this binds the cm_id to a device. If we want to support 167 * fail-over we'll have to take this into consideration. 168 */ 169 ret = rdma_bind_addr(cm_id, (struct sockaddr *)&sin); 170 if (ret) { 171 printk(KERN_ERR "RDS/RDMA: failed to setup listener, " 172 "rdma_bind_addr() returned %d\n", ret); 173 goto out; 174 } 175 176 ret = rdma_listen(cm_id, 128); 177 if (ret) { 178 printk(KERN_ERR "RDS/RDMA: failed to setup listener, " 179 "rdma_listen() returned %d\n", ret); 180 goto out; 181 } 182 183 rdsdebug("cm %p listening on port %u\n", cm_id, RDS_PORT); 184 185 rds_rdma_listen_id = cm_id; 186 cm_id = NULL; 187 out: 188 if (cm_id) 189 rdma_destroy_id(cm_id); 190 return ret; 191 } 192 193 static void rds_rdma_listen_stop(void) 194 { 195 if (rds_rdma_listen_id) { 196 rdsdebug("cm %p\n", rds_rdma_listen_id); 197 rdma_destroy_id(rds_rdma_listen_id); 198 rds_rdma_listen_id = NULL; 199 } 200 } 201 202 static int rds_rdma_init(void) 203 { 204 int ret; 205 206 ret = rds_rdma_listen_init(); 207 if (ret) 208 goto out; 209 210 ret = rds_ib_init(); 211 if (ret) 212 goto err_ib_init; 213 214 goto out; 215 216 err_ib_init: 217 rds_rdma_listen_stop(); 218 out: 219 return ret; 220 } 221 module_init(rds_rdma_init); 222 223 static void rds_rdma_exit(void) 224 { 225 /* stop listening first to ensure no new connections are attempted */ 226 rds_rdma_listen_stop(); 227 rds_ib_exit(); 228 } 229 module_exit(rds_rdma_exit); 230 231 MODULE_AUTHOR("Oracle Corporation <rds-devel@oss.oracle.com>"); 232 MODULE_DESCRIPTION("RDS: IB transport"); 233 MODULE_LICENSE("Dual BSD/GPL"); 234 235