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Linux/net/rds/rdma_transport.c

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

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