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 37static struct rdma_cm_id *rds_rdma_listen_id; 38 39int 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 ret = rdma_resolve_route(cm_id, 79 RDS_RDMA_RESOLVE_TIMEOUT_MS); 80 break; 81 82 case RDMA_CM_EVENT_ROUTE_RESOLVED: 83 ret = trans->cm_initiate_connect(cm_id); 84 break; 85 86 case RDMA_CM_EVENT_ESTABLISHED: 87 trans->cm_connect_complete(conn, event); 88 break; 89 90 case RDMA_CM_EVENT_ADDR_ERROR: 91 case RDMA_CM_EVENT_ROUTE_ERROR: 92 case RDMA_CM_EVENT_CONNECT_ERROR: 93 case RDMA_CM_EVENT_UNREACHABLE: 94 case RDMA_CM_EVENT_REJECTED: 95 case RDMA_CM_EVENT_DEVICE_REMOVAL: 96 case RDMA_CM_EVENT_ADDR_CHANGE: 97 if (conn) 98 rds_conn_drop(conn); 99 break; 100 101 case RDMA_CM_EVENT_DISCONNECTED: 102 rdsdebug("DISCONNECT event - dropping connection " 103 "%pI4->%pI4\n", &conn->c_laddr, 104 &conn->c_faddr); 105 rds_conn_drop(conn); 106 break; 107 108 default: 109 /* things like device disconnect? */ 110 printk(KERN_ERR "RDS: unknown event %u!\n", event->event); 111 break; 112 } 113 114out: 115 if (conn) 116 mutex_unlock(&conn->c_cm_lock); 117 118 rdsdebug("id %p event %u handling ret %d\n", cm_id, event->event, ret); 119 120 return ret; 121} 122 123static int __init rds_rdma_listen_init(void) 124{ 125 struct sockaddr_in sin; 126 struct rdma_cm_id *cm_id; 127 int ret; 128 129 cm_id = rdma_create_id(rds_rdma_cm_event_handler, NULL, RDMA_PS_TCP); 130 if (IS_ERR(cm_id)) { 131 ret = PTR_ERR(cm_id); 132 printk(KERN_ERR "RDS/RDMA: failed to setup listener, " 133 "rdma_create_id() returned %d\n", ret); 134 return ret; 135 } 136 137 sin.sin_family = AF_INET, 138 sin.sin_addr.s_addr = (__force u32)htonl(INADDR_ANY); 139 sin.sin_port = (__force u16)htons(RDS_PORT); 140 141 ret = rdma_bind_addr(cm_id, (struct sockaddr *)&sin); 142 if (ret) { 143 printk(KERN_ERR "RDS/RDMA: failed to setup listener, " 144 "rdma_bind_addr() returned %d\n", ret); 145 goto out; 146 } 147 148 ret = rdma_listen(cm_id, 128); 149 if (ret) { 150 printk(KERN_ERR "RDS/RDMA: failed to setup listener, " 151 "rdma_listen() returned %d\n", ret); 152 goto out; 153 } 154 155 rdsdebug("cm %p listening on port %u\n", cm_id, RDS_PORT); 156 157 rds_rdma_listen_id = cm_id; 158 cm_id = NULL; 159out: 160 if (cm_id) 161 rdma_destroy_id(cm_id); 162 return ret; 163} 164 165static void rds_rdma_listen_stop(void) 166{ 167 if (rds_rdma_listen_id) { 168 rdsdebug("cm %p\n", rds_rdma_listen_id); 169 rdma_destroy_id(rds_rdma_listen_id); 170 rds_rdma_listen_id = NULL; 171 } 172} 173 174int __init rds_rdma_init(void) 175{ 176 int ret; 177 178 ret = rds_rdma_listen_init(); 179 if (ret) 180 goto out; 181 182 ret = rds_iw_init(); 183 if (ret) 184 goto err_iw_init; 185 186 ret = rds_ib_init(); 187 if (ret) 188 goto err_ib_init; 189 190 goto out; 191 192err_ib_init: 193 rds_iw_exit(); 194err_iw_init: 195 rds_rdma_listen_stop(); 196out: 197 return ret; 198} 199module_init(rds_rdma_init); 200 201void rds_rdma_exit(void) 202{ 203 /* stop listening first to ensure no new connections are attempted */ 204 rds_rdma_listen_stop(); 205 rds_ib_exit(); 206 rds_iw_exit(); 207} 208module_exit(rds_rdma_exit); 209 210MODULE_AUTHOR("Oracle Corporation <rds-devel@oss.oracle.com>"); 211MODULE_DESCRIPTION("RDS: IB/iWARP transport"); 212MODULE_LICENSE("Dual BSD/GPL"); 213