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_RNIC) 53 trans = &rds_iw_transport; 54 else 55 trans = &rds_ib_transport; 56 57 /* Prevent shutdown from tearing down the connection 58 * while we're executing. */ 59 if (conn) { 60 mutex_lock(&conn->c_cm_lock); 61 62 /* If the connection is being shut down, bail out 63 * right away. We return 0 so cm_id doesn't get 64 * destroyed prematurely */ 65 if (rds_conn_state(conn) == RDS_CONN_DISCONNECTING) { 66 /* Reject incoming connections while we're tearing 67 * down an existing one. */ 68 if (event->event == RDMA_CM_EVENT_CONNECT_REQUEST) 69 ret = 1; 70 goto out; 71 } 72 } 73 74 switch (event->event) { 75 case RDMA_CM_EVENT_CONNECT_REQUEST: 76 ret = trans->cm_handle_connect(cm_id, event); 77 break; 78 79 case RDMA_CM_EVENT_ADDR_RESOLVED: 80 /* XXX do we need to clean up if this fails? */ 81 ret = rdma_resolve_route(cm_id, 82 RDS_RDMA_RESOLVE_TIMEOUT_MS); 83 break; 84 85 case RDMA_CM_EVENT_ROUTE_RESOLVED: 86 /* Connection could have been dropped so make sure the 87 * cm_id is valid before proceeding 88 */ 89 if (conn) { 90 struct rds_ib_connection *ibic; 91 92 ibic = conn->c_transport_data; 93 if (ibic && ibic->i_cm_id == cm_id) 94 ret = trans->cm_initiate_connect(cm_id); 95 else 96 rds_conn_drop(conn); 97 } 98 break; 99 100 case RDMA_CM_EVENT_ESTABLISHED: 101 trans->cm_connect_complete(conn, event); 102 break; 103 104 case RDMA_CM_EVENT_ADDR_ERROR: 105 case RDMA_CM_EVENT_ROUTE_ERROR: 106 case RDMA_CM_EVENT_CONNECT_ERROR: 107 case RDMA_CM_EVENT_UNREACHABLE: 108 case RDMA_CM_EVENT_REJECTED: 109 case RDMA_CM_EVENT_DEVICE_REMOVAL: 110 case RDMA_CM_EVENT_ADDR_CHANGE: 111 if (conn) 112 rds_conn_drop(conn); 113 break; 114 115 case RDMA_CM_EVENT_DISCONNECTED: 116 rdsdebug("DISCONNECT event - dropping connection " 117 "%pI4->%pI4\n", &conn->c_laddr, 118 &conn->c_faddr); 119 rds_conn_drop(conn); 120 break; 121 122 default: 123 /* things like device disconnect? */ 124 printk(KERN_ERR "RDS: unknown event %u (%s)!\n", 125 event->event, rdma_event_msg(event->event)); 126 break; 127 } 128 129 out: 130 if (conn) 131 mutex_unlock(&conn->c_cm_lock); 132 133 rdsdebug("id %p event %u (%s) handling ret %d\n", cm_id, event->event, 134 rdma_event_msg(event->event), ret); 135 136 return ret; 137 } 138 139 static int rds_rdma_listen_init(void) 140 { 141 struct sockaddr_in sin; 142 struct rdma_cm_id *cm_id; 143 int ret; 144 145 cm_id = rdma_create_id(&init_net, rds_rdma_cm_event_handler, NULL, 146 RDMA_PS_TCP, IB_QPT_RC); 147 if (IS_ERR(cm_id)) { 148 ret = PTR_ERR(cm_id); 149 printk(KERN_ERR "RDS/RDMA: failed to setup listener, " 150 "rdma_create_id() returned %d\n", ret); 151 return ret; 152 } 153 154 sin.sin_family = AF_INET; 155 sin.sin_addr.s_addr = (__force u32)htonl(INADDR_ANY); 156 sin.sin_port = (__force u16)htons(RDS_PORT); 157 158 /* 159 * XXX I bet this binds the cm_id to a device. If we want to support 160 * fail-over we'll have to take this into consideration. 161 */ 162 ret = rdma_bind_addr(cm_id, (struct sockaddr *)&sin); 163 if (ret) { 164 printk(KERN_ERR "RDS/RDMA: failed to setup listener, " 165 "rdma_bind_addr() returned %d\n", ret); 166 goto out; 167 } 168 169 ret = rdma_listen(cm_id, 128); 170 if (ret) { 171 printk(KERN_ERR "RDS/RDMA: failed to setup listener, " 172 "rdma_listen() returned %d\n", ret); 173 goto out; 174 } 175 176 rdsdebug("cm %p listening on port %u\n", cm_id, RDS_PORT); 177 178 rds_rdma_listen_id = cm_id; 179 cm_id = NULL; 180 out: 181 if (cm_id) 182 rdma_destroy_id(cm_id); 183 return ret; 184 } 185 186 static void rds_rdma_listen_stop(void) 187 { 188 if (rds_rdma_listen_id) { 189 rdsdebug("cm %p\n", rds_rdma_listen_id); 190 rdma_destroy_id(rds_rdma_listen_id); 191 rds_rdma_listen_id = NULL; 192 } 193 } 194 195 static int rds_rdma_init(void) 196 { 197 int ret; 198 199 ret = rds_rdma_listen_init(); 200 if (ret) 201 goto out; 202 203 ret = rds_iw_init(); 204 if (ret) 205 goto err_iw_init; 206 207 ret = rds_ib_init(); 208 if (ret) 209 goto err_ib_init; 210 211 goto out; 212 213 err_ib_init: 214 rds_iw_exit(); 215 err_iw_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 rds_iw_exit(); 228 } 229 module_exit(rds_rdma_exit); 230 231 MODULE_AUTHOR("Oracle Corporation <rds-devel@oss.oracle.com>"); 232 MODULE_DESCRIPTION("RDS: IB/iWARP transport"); 233 MODULE_LICENSE("Dual BSD/GPL"); 234 235