Merge tag 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mst/vhost
[cris-mirror.git] / net / rds / rdma_transport.c
blobfc59821f0a27bd2a529c17a36c5b06a1d5d91a8e
1 /*
2 * Copyright (c) 2009 Oracle. All rights reserved.
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:
10 * Redistribution and use in source and binary forms, with or
11 * without modification, are permitted provided that the following
12 * conditions are met:
14 * - Redistributions of source code must retain the above
15 * copyright notice, this list of conditions and the following
16 * disclaimer.
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.
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.
33 #include <linux/module.h>
34 #include <rdma/rdma_cm.h>
36 #include "rds_single_path.h"
37 #include "rdma_transport.h"
38 #include "ib.h"
40 static struct rdma_cm_id *rds_rdma_listen_id;
42 int rds_rdma_cm_event_handler(struct rdma_cm_id *cm_id,
43 struct rdma_cm_event *event)
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;
50 rdsdebug("conn %p id %p handling event %u (%s)\n", conn, cm_id,
51 event->event, rdma_event_msg(event->event));
53 if (cm_id->device->node_type == RDMA_NODE_IB_CA)
54 trans = &rds_ib_transport;
56 /* Prevent shutdown from tearing down the connection
57 * while we're executing. */
58 if (conn) {
59 mutex_lock(&conn->c_cm_lock);
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;
73 switch (event->event) {
74 case RDMA_CM_EVENT_CONNECT_REQUEST:
75 ret = trans->cm_handle_connect(cm_id, event);
76 break;
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;
84 case RDMA_CM_EVENT_ROUTE_RESOLVED:
85 /* Connection could have been dropped so make sure the
86 * cm_id is valid before proceeding
88 if (conn) {
89 struct rds_ib_connection *ibic;
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);
97 break;
99 case RDMA_CM_EVENT_ESTABLISHED:
100 trans->cm_connect_complete(conn, event);
101 break;
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;
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;
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);
130 break;
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;
139 out:
140 if (conn)
141 mutex_unlock(&conn->c_cm_lock);
143 rdsdebug("id %p event %u (%s) handling ret %d\n", cm_id, event->event,
144 rdma_event_msg(event->event), ret);
146 return ret;
149 static int rds_rdma_listen_init(void)
151 struct sockaddr_in sin;
152 struct rdma_cm_id *cm_id;
153 int ret;
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;
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);
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.
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;
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;
186 rdsdebug("cm %p listening on port %u\n", cm_id, RDS_PORT);
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;
196 static void rds_rdma_listen_stop(void)
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;
205 static int rds_rdma_init(void)
207 int ret;
209 ret = rds_ib_init();
210 if (ret)
211 goto out;
213 ret = rds_rdma_listen_init();
214 if (ret)
215 rds_ib_exit();
216 out:
217 return ret;
219 module_init(rds_rdma_init);
221 static void rds_rdma_exit(void)
223 /* stop listening first to ensure no new connections are attempted */
224 rds_rdma_listen_stop();
225 rds_ib_exit();
227 module_exit(rds_rdma_exit);
229 MODULE_AUTHOR("Oracle Corporation <rds-devel@oss.oracle.com>");
230 MODULE_DESCRIPTION("RDS: IB transport");
231 MODULE_LICENSE("Dual BSD/GPL");