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 38 static struct rdma_cm_id *rds_rdma_listen_id; 39 40 int rds_rdma_cm_event_handler(struct rdma_cm_id *cm_id, 41 struct rdma_cm_event *event) 42 { 43 /* this can be null in the listening path */ 44 struct rds_connection *conn = cm_id->context; 45 struct rds_transport *trans; 46 int ret = 0; 47 48 rdsdebug("conn %p id %p handling event %u (%s)\n", conn, cm_id, 49 event->event, rdma_event_msg(event->event)); 50 51 if (cm_id->device->node_type == RDMA_NODE_RNIC) 52 trans = &rds_iw_transport; 53 else 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 /* XXX worry about racing with listen acceptance */ 86 ret = trans->cm_initiate_connect(cm_id); 87 break; 88 89 case RDMA_CM_EVENT_ESTABLISHED: 90 trans->cm_connect_complete(conn, event); 91 break; 92 93 case RDMA_CM_EVENT_ADDR_ERROR: 94 case RDMA_CM_EVENT_ROUTE_ERROR: 95 case RDMA_CM_EVENT_CONNECT_ERROR: 96 case RDMA_CM_EVENT_UNREACHABLE: 97 case RDMA_CM_EVENT_REJECTED: 98 case RDMA_CM_EVENT_DEVICE_REMOVAL: 99 case RDMA_CM_EVENT_ADDR_CHANGE: 100 if (conn) 101 rds_conn_drop(conn); 102 break; 103 104 case RDMA_CM_EVENT_DISCONNECTED: 105 rdsdebug("DISCONNECT event - dropping connection " 106 "%pI4->%pI4\n", &conn->c_laddr, 107 &conn->c_faddr); 108 rds_conn_drop(conn); 109 break; 110 111 default: 112 /* things like device disconnect? */ 113 printk(KERN_ERR "RDS: unknown event %u (%s)!\n", 114 event->event, rdma_event_msg(event->event)); 115 break; 116 } 117 118 out: 119 if (conn) 120 mutex_unlock(&conn->c_cm_lock); 121 122 rdsdebug("id %p event %u (%s) handling ret %d\n", cm_id, event->event, 123 rdma_event_msg(event->event), ret); 124 125 return ret; 126 } 127 128 static int rds_rdma_listen_init(void) 129 { 130 struct sockaddr_in sin; 131 struct rdma_cm_id *cm_id; 132 int ret; 133 134 cm_id = rdma_create_id(rds_rdma_cm_event_handler, NULL, RDMA_PS_TCP, 135 IB_QPT_RC); 136 if (IS_ERR(cm_id)) { 137 ret = PTR_ERR(cm_id); 138 printk(KERN_ERR "RDS/RDMA: failed to setup listener, " 139 "rdma_create_id() returned %d\n", ret); 140 return ret; 141 } 142 143 sin.sin_family = AF_INET; 144 sin.sin_addr.s_addr = (__force u32)htonl(INADDR_ANY); 145 sin.sin_port = (__force u16)htons(RDS_PORT); 146 147 /* 148 * XXX I bet this binds the cm_id to a device. If we want to support 149 * fail-over we'll have to take this into consideration. 150 */ 151 ret = rdma_bind_addr(cm_id, (struct sockaddr *)&sin); 152 if (ret) { 153 printk(KERN_ERR "RDS/RDMA: failed to setup listener, " 154 "rdma_bind_addr() returned %d\n", ret); 155 goto out; 156 } 157 158 ret = rdma_listen(cm_id, 128); 159 if (ret) { 160 printk(KERN_ERR "RDS/RDMA: failed to setup listener, " 161 "rdma_listen() returned %d\n", ret); 162 goto out; 163 } 164 165 rdsdebug("cm %p listening on port %u\n", cm_id, RDS_PORT); 166 167 rds_rdma_listen_id = cm_id; 168 cm_id = NULL; 169 out: 170 if (cm_id) 171 rdma_destroy_id(cm_id); 172 return ret; 173 } 174 175 static void rds_rdma_listen_stop(void) 176 { 177 if (rds_rdma_listen_id) { 178 rdsdebug("cm %p\n", rds_rdma_listen_id); 179 rdma_destroy_id(rds_rdma_listen_id); 180 rds_rdma_listen_id = NULL; 181 } 182 } 183 184 static int rds_rdma_init(void) 185 { 186 int ret; 187 188 ret = rds_rdma_listen_init(); 189 if (ret) 190 goto out; 191 192 ret = rds_iw_init(); 193 if (ret) 194 goto err_iw_init; 195 196 ret = rds_ib_init(); 197 if (ret) 198 goto err_ib_init; 199 200 goto out; 201 202 err_ib_init: 203 rds_iw_exit(); 204 err_iw_init: 205 rds_rdma_listen_stop(); 206 out: 207 return ret; 208 } 209 module_init(rds_rdma_init); 210 211 static void rds_rdma_exit(void) 212 { 213 /* stop listening first to ensure no new connections are attempted */ 214 rds_rdma_listen_stop(); 215 rds_ib_exit(); 216 rds_iw_exit(); 217 } 218 module_exit(rds_rdma_exit); 219 220 MODULE_AUTHOR("Oracle Corporation <rds-devel@oss.oracle.com>"); 221 MODULE_DESCRIPTION("RDS: IB/iWARP transport"); 222 MODULE_LICENSE("Dual BSD/GPL"); 223 224