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 static char *rds_cm_event_strings[] = {
40 #define RDS_CM_EVENT_STRING(foo) \
41 [RDMA_CM_EVENT_##foo] = __stringify(RDMA_CM_EVENT_##foo)
42 RDS_CM_EVENT_STRING(ADDR_RESOLVED),
43 RDS_CM_EVENT_STRING(ADDR_ERROR),
44 RDS_CM_EVENT_STRING(ROUTE_RESOLVED),
45 RDS_CM_EVENT_STRING(ROUTE_ERROR),
46 RDS_CM_EVENT_STRING(CONNECT_REQUEST),
47 RDS_CM_EVENT_STRING(CONNECT_RESPONSE),
48 RDS_CM_EVENT_STRING(CONNECT_ERROR),
49 RDS_CM_EVENT_STRING(UNREACHABLE),
50 RDS_CM_EVENT_STRING(REJECTED),
51 RDS_CM_EVENT_STRING(ESTABLISHED),
52 RDS_CM_EVENT_STRING(DISCONNECTED),
53 RDS_CM_EVENT_STRING(DEVICE_REMOVAL),
54 RDS_CM_EVENT_STRING(MULTICAST_JOIN),
55 RDS_CM_EVENT_STRING(MULTICAST_ERROR),
56 RDS_CM_EVENT_STRING(ADDR_CHANGE),
57 RDS_CM_EVENT_STRING(TIMEWAIT_EXIT),
58 #undef RDS_CM_EVENT_STRING
59 };
60
rds_cm_event_str(enum rdma_cm_event_type type)61 static char *rds_cm_event_str(enum rdma_cm_event_type type)
62 {
63 return rds_str_array(rds_cm_event_strings,
64 ARRAY_SIZE(rds_cm_event_strings), type);
65 };
66
rds_rdma_cm_event_handler(struct rdma_cm_id * cm_id,struct rdma_cm_event * event)67 int rds_rdma_cm_event_handler(struct rdma_cm_id *cm_id,
68 struct rdma_cm_event *event)
69 {
70 /* this can be null in the listening path */
71 struct rds_connection *conn = cm_id->context;
72 struct rds_transport *trans;
73 int ret = 0;
74
75 rdsdebug("conn %p id %p handling event %u (%s)\n", conn, cm_id,
76 event->event, rds_cm_event_str(event->event));
77
78 if (cm_id->device->node_type == RDMA_NODE_RNIC)
79 trans = &rds_iw_transport;
80 else
81 trans = &rds_ib_transport;
82
83 /* Prevent shutdown from tearing down the connection
84 * while we're executing. */
85 if (conn) {
86 mutex_lock(&conn->c_cm_lock);
87
88 /* If the connection is being shut down, bail out
89 * right away. We return 0 so cm_id doesn't get
90 * destroyed prematurely */
91 if (rds_conn_state(conn) == RDS_CONN_DISCONNECTING) {
92 /* Reject incoming connections while we're tearing
93 * down an existing one. */
94 if (event->event == RDMA_CM_EVENT_CONNECT_REQUEST)
95 ret = 1;
96 goto out;
97 }
98 }
99
100 switch (event->event) {
101 case RDMA_CM_EVENT_CONNECT_REQUEST:
102 ret = trans->cm_handle_connect(cm_id, event);
103 break;
104
105 case RDMA_CM_EVENT_ADDR_RESOLVED:
106 /* XXX do we need to clean up if this fails? */
107 ret = rdma_resolve_route(cm_id,
108 RDS_RDMA_RESOLVE_TIMEOUT_MS);
109 break;
110
111 case RDMA_CM_EVENT_ROUTE_RESOLVED:
112 /* XXX worry about racing with listen acceptance */
113 ret = trans->cm_initiate_connect(cm_id);
114 break;
115
116 case RDMA_CM_EVENT_ESTABLISHED:
117 trans->cm_connect_complete(conn, event);
118 break;
119
120 case RDMA_CM_EVENT_ADDR_ERROR:
121 case RDMA_CM_EVENT_ROUTE_ERROR:
122 case RDMA_CM_EVENT_CONNECT_ERROR:
123 case RDMA_CM_EVENT_UNREACHABLE:
124 case RDMA_CM_EVENT_REJECTED:
125 case RDMA_CM_EVENT_DEVICE_REMOVAL:
126 case RDMA_CM_EVENT_ADDR_CHANGE:
127 if (conn)
128 rds_conn_drop(conn);
129 break;
130
131 case RDMA_CM_EVENT_DISCONNECTED:
132 rdsdebug("DISCONNECT event - dropping connection "
133 "%pI4->%pI4\n", &conn->c_laddr,
134 &conn->c_faddr);
135 rds_conn_drop(conn);
136 break;
137
138 default:
139 /* things like device disconnect? */
140 printk(KERN_ERR "RDS: unknown event %u (%s)!\n",
141 event->event, rds_cm_event_str(event->event));
142 break;
143 }
144
145 out:
146 if (conn)
147 mutex_unlock(&conn->c_cm_lock);
148
149 rdsdebug("id %p event %u (%s) handling ret %d\n", cm_id, event->event,
150 rds_cm_event_str(event->event), ret);
151
152 return ret;
153 }
154
rds_rdma_listen_init(void)155 static int rds_rdma_listen_init(void)
156 {
157 struct sockaddr_in sin;
158 struct rdma_cm_id *cm_id;
159 int ret;
160
161 cm_id = rdma_create_id(rds_rdma_cm_event_handler, NULL, RDMA_PS_TCP);
162 if (IS_ERR(cm_id)) {
163 ret = PTR_ERR(cm_id);
164 printk(KERN_ERR "RDS/RDMA: failed to setup listener, "
165 "rdma_create_id() returned %d\n", ret);
166 return ret;
167 }
168
169 sin.sin_family = AF_INET,
170 sin.sin_addr.s_addr = (__force u32)htonl(INADDR_ANY);
171 sin.sin_port = (__force u16)htons(RDS_PORT);
172
173 /*
174 * XXX I bet this binds the cm_id to a device. If we want to support
175 * fail-over we'll have to take this into consideration.
176 */
177 ret = rdma_bind_addr(cm_id, (struct sockaddr *)&sin);
178 if (ret) {
179 printk(KERN_ERR "RDS/RDMA: failed to setup listener, "
180 "rdma_bind_addr() returned %d\n", ret);
181 goto out;
182 }
183
184 ret = rdma_listen(cm_id, 128);
185 if (ret) {
186 printk(KERN_ERR "RDS/RDMA: failed to setup listener, "
187 "rdma_listen() returned %d\n", ret);
188 goto out;
189 }
190
191 rdsdebug("cm %p listening on port %u\n", cm_id, RDS_PORT);
192
193 rds_rdma_listen_id = cm_id;
194 cm_id = NULL;
195 out:
196 if (cm_id)
197 rdma_destroy_id(cm_id);
198 return ret;
199 }
200
rds_rdma_listen_stop(void)201 static void rds_rdma_listen_stop(void)
202 {
203 if (rds_rdma_listen_id) {
204 rdsdebug("cm %p\n", rds_rdma_listen_id);
205 rdma_destroy_id(rds_rdma_listen_id);
206 rds_rdma_listen_id = NULL;
207 }
208 }
209
rds_rdma_init(void)210 static int rds_rdma_init(void)
211 {
212 int ret;
213
214 ret = rds_rdma_listen_init();
215 if (ret)
216 goto out;
217
218 ret = rds_iw_init();
219 if (ret)
220 goto err_iw_init;
221
222 ret = rds_ib_init();
223 if (ret)
224 goto err_ib_init;
225
226 goto out;
227
228 err_ib_init:
229 rds_iw_exit();
230 err_iw_init:
231 rds_rdma_listen_stop();
232 out:
233 return ret;
234 }
235 module_init(rds_rdma_init);
236
rds_rdma_exit(void)237 static void rds_rdma_exit(void)
238 {
239 /* stop listening first to ensure no new connections are attempted */
240 rds_rdma_listen_stop();
241 rds_ib_exit();
242 rds_iw_exit();
243 }
244 module_exit(rds_rdma_exit);
245
246 MODULE_AUTHOR("Oracle Corporation <rds-devel@oss.oracle.com>");
247 MODULE_DESCRIPTION("RDS: IB/iWARP transport");
248 MODULE_LICENSE("Dual BSD/GPL");
249
250