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 <rdma/rdma_cm.h> 34 35 #include "rdma_transport.h" 36 37 static struct rdma_cm_id *rds_rdma_listen_id; 38 39 int rds_rdma_cm_event_handler(struct rdma_cm_id *cm_id, 40 struct rdma_cm_event *event) 41 { 42 /* this can be null in the listening path */ 43 struct rds_connection *conn = cm_id->context; 44 struct rds_transport *trans; 45 int ret = 0; 46 47 rdsdebug("conn %p id %p handling event %u\n", conn, cm_id, 48 event->event); 49 50 if (cm_id->device->node_type == RDMA_NODE_RNIC) 51 trans = &rds_iw_transport; 52 else 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 /* XXX worry about racing with listen acceptance */ 85 ret = trans->cm_initiate_connect(cm_id); 86 break; 87 88 case RDMA_CM_EVENT_ESTABLISHED: 89 trans->cm_connect_complete(conn, event); 90 break; 91 92 case RDMA_CM_EVENT_ADDR_ERROR: 93 case RDMA_CM_EVENT_ROUTE_ERROR: 94 case RDMA_CM_EVENT_CONNECT_ERROR: 95 case RDMA_CM_EVENT_UNREACHABLE: 96 case RDMA_CM_EVENT_REJECTED: 97 case RDMA_CM_EVENT_DEVICE_REMOVAL: 98 case RDMA_CM_EVENT_ADDR_CHANGE: 99 if (conn) 100 rds_conn_drop(conn); 101 break; 102 103 case RDMA_CM_EVENT_DISCONNECTED: 104 printk(KERN_WARNING "RDS/RDMA: DISCONNECT event - dropping connection " 105 "%pI4->%pI4\n", &conn->c_laddr, 106 &conn->c_faddr); 107 rds_conn_drop(conn); 108 break; 109 110 default: 111 /* things like device disconnect? */ 112 printk(KERN_ERR "unknown event %u\n", event->event); 113 BUG(); 114 break; 115 } 116 117 out: 118 if (conn) 119 mutex_unlock(&conn->c_cm_lock); 120 121 rdsdebug("id %p event %u handling ret %d\n", cm_id, event->event, ret); 122 123 return ret; 124 } 125 126 static int __init rds_rdma_listen_init(void) 127 { 128 struct sockaddr_in sin; 129 struct rdma_cm_id *cm_id; 130 int ret; 131 132 cm_id = rdma_create_id(rds_rdma_cm_event_handler, NULL, RDMA_PS_TCP); 133 if (IS_ERR(cm_id)) { 134 ret = PTR_ERR(cm_id); 135 printk(KERN_ERR "RDS/RDMA: failed to setup listener, " 136 "rdma_create_id() returned %d\n", ret); 137 goto out; 138 } 139 140 sin.sin_family = AF_INET, 141 sin.sin_addr.s_addr = (__force u32)htonl(INADDR_ANY); 142 sin.sin_port = (__force u16)htons(RDS_PORT); 143 144 /* 145 * XXX I bet this binds the cm_id to a device. If we want to support 146 * fail-over we'll have to take this into consideration. 147 */ 148 ret = rdma_bind_addr(cm_id, (struct sockaddr *)&sin); 149 if (ret) { 150 printk(KERN_ERR "RDS/RDMA: failed to setup listener, " 151 "rdma_bind_addr() returned %d\n", ret); 152 goto out; 153 } 154 155 ret = rdma_listen(cm_id, 128); 156 if (ret) { 157 printk(KERN_ERR "RDS/RDMA: failed to setup listener, " 158 "rdma_listen() returned %d\n", ret); 159 goto out; 160 } 161 162 rdsdebug("cm %p listening on port %u\n", cm_id, RDS_PORT); 163 164 rds_rdma_listen_id = cm_id; 165 cm_id = NULL; 166 out: 167 if (cm_id) 168 rdma_destroy_id(cm_id); 169 return ret; 170 } 171 172 static void rds_rdma_listen_stop(void) 173 { 174 if (rds_rdma_listen_id) { 175 rdsdebug("cm %p\n", rds_rdma_listen_id); 176 rdma_destroy_id(rds_rdma_listen_id); 177 rds_rdma_listen_id = NULL; 178 } 179 } 180 181 int __init rds_rdma_init(void) 182 { 183 int ret; 184 185 ret = rds_rdma_listen_init(); 186 if (ret) 187 goto out; 188 189 ret = rds_iw_init(); 190 if (ret) 191 goto err_iw_init; 192 193 ret = rds_ib_init(); 194 if (ret) 195 goto err_ib_init; 196 197 goto out; 198 199 err_ib_init: 200 rds_iw_exit(); 201 err_iw_init: 202 rds_rdma_listen_stop(); 203 out: 204 return ret; 205 } 206 module_init(rds_rdma_init); 207 208 void rds_rdma_exit(void) 209 { 210 /* stop listening first to ensure no new connections are attempted */ 211 rds_rdma_listen_stop(); 212 rds_ib_exit(); 213 rds_iw_exit(); 214 } 215 module_exit(rds_rdma_exit); 216 217 MODULE_AUTHOR("Oracle Corporation <rds-devel@oss.oracle.com>"); 218 MODULE_DESCRIPTION("RDS: IB/iWARP transport"); 219 MODULE_LICENSE("Dual BSD/GPL"); 220 221