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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 <rdma/rdma_cm.h>
34
35#include "rdma_transport.h"
36
37static struct rdma_cm_id *rds_rdma_listen_id;
38
39static 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
61static 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
67int 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
145out:
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
155static 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 IB_QPT_RC);
163 if (IS_ERR(cm_id)) {
164 ret = PTR_ERR(cm_id);
165 printk(KERN_ERR "RDS/RDMA: failed to setup listener, "
166 "rdma_create_id() returned %d\n", ret);
167 return ret;
168 }
169
170 sin.sin_family = AF_INET,
171 sin.sin_addr.s_addr = (__force u32)htonl(INADDR_ANY);
172 sin.sin_port = (__force u16)htons(RDS_PORT);
173
174 /*
175 * XXX I bet this binds the cm_id to a device. If we want to support
176 * fail-over we'll have to take this into consideration.
177 */
178 ret = rdma_bind_addr(cm_id, (struct sockaddr *)&sin);
179 if (ret) {
180 printk(KERN_ERR "RDS/RDMA: failed to setup listener, "
181 "rdma_bind_addr() returned %d\n", ret);
182 goto out;
183 }
184
185 ret = rdma_listen(cm_id, 128);
186 if (ret) {
187 printk(KERN_ERR "RDS/RDMA: failed to setup listener, "
188 "rdma_listen() returned %d\n", ret);
189 goto out;
190 }
191
192 rdsdebug("cm %p listening on port %u\n", cm_id, RDS_PORT);
193
194 rds_rdma_listen_id = cm_id;
195 cm_id = NULL;
196out:
197 if (cm_id)
198 rdma_destroy_id(cm_id);
199 return ret;
200}
201
202static void rds_rdma_listen_stop(void)
203{
204 if (rds_rdma_listen_id) {
205 rdsdebug("cm %p\n", rds_rdma_listen_id);
206 rdma_destroy_id(rds_rdma_listen_id);
207 rds_rdma_listen_id = NULL;
208 }
209}
210
211static int rds_rdma_init(void)
212{
213 int ret;
214
215 ret = rds_rdma_listen_init();
216 if (ret)
217 goto out;
218
219 ret = rds_iw_init();
220 if (ret)
221 goto err_iw_init;
222
223 ret = rds_ib_init();
224 if (ret)
225 goto err_ib_init;
226
227 goto out;
228
229err_ib_init:
230 rds_iw_exit();
231err_iw_init:
232 rds_rdma_listen_stop();
233out:
234 return ret;
235}
236module_init(rds_rdma_init);
237
238static void rds_rdma_exit(void)
239{
240 /* stop listening first to ensure no new connections are attempted */
241 rds_rdma_listen_stop();
242 rds_ib_exit();
243 rds_iw_exit();
244}
245module_exit(rds_rdma_exit);
246
247MODULE_AUTHOR("Oracle Corporation <rds-devel@oss.oracle.com>");
248MODULE_DESCRIPTION("RDS: IB/iWARP transport");
249MODULE_LICENSE("Dual BSD/GPL");
250
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 "rdma_transport.h"
37
38static struct rdma_cm_id *rds_rdma_listen_id;
39
40static char *rds_cm_event_strings[] = {
41#define RDS_CM_EVENT_STRING(foo) \
42 [RDMA_CM_EVENT_##foo] = __stringify(RDMA_CM_EVENT_##foo)
43 RDS_CM_EVENT_STRING(ADDR_RESOLVED),
44 RDS_CM_EVENT_STRING(ADDR_ERROR),
45 RDS_CM_EVENT_STRING(ROUTE_RESOLVED),
46 RDS_CM_EVENT_STRING(ROUTE_ERROR),
47 RDS_CM_EVENT_STRING(CONNECT_REQUEST),
48 RDS_CM_EVENT_STRING(CONNECT_RESPONSE),
49 RDS_CM_EVENT_STRING(CONNECT_ERROR),
50 RDS_CM_EVENT_STRING(UNREACHABLE),
51 RDS_CM_EVENT_STRING(REJECTED),
52 RDS_CM_EVENT_STRING(ESTABLISHED),
53 RDS_CM_EVENT_STRING(DISCONNECTED),
54 RDS_CM_EVENT_STRING(DEVICE_REMOVAL),
55 RDS_CM_EVENT_STRING(MULTICAST_JOIN),
56 RDS_CM_EVENT_STRING(MULTICAST_ERROR),
57 RDS_CM_EVENT_STRING(ADDR_CHANGE),
58 RDS_CM_EVENT_STRING(TIMEWAIT_EXIT),
59#undef RDS_CM_EVENT_STRING
60};
61
62static char *rds_cm_event_str(enum rdma_cm_event_type type)
63{
64 return rds_str_array(rds_cm_event_strings,
65 ARRAY_SIZE(rds_cm_event_strings), type);
66};
67
68int rds_rdma_cm_event_handler(struct rdma_cm_id *cm_id,
69 struct rdma_cm_event *event)
70{
71 /* this can be null in the listening path */
72 struct rds_connection *conn = cm_id->context;
73 struct rds_transport *trans;
74 int ret = 0;
75
76 rdsdebug("conn %p id %p handling event %u (%s)\n", conn, cm_id,
77 event->event, rds_cm_event_str(event->event));
78
79 if (cm_id->device->node_type == RDMA_NODE_RNIC)
80 trans = &rds_iw_transport;
81 else
82 trans = &rds_ib_transport;
83
84 /* Prevent shutdown from tearing down the connection
85 * while we're executing. */
86 if (conn) {
87 mutex_lock(&conn->c_cm_lock);
88
89 /* If the connection is being shut down, bail out
90 * right away. We return 0 so cm_id doesn't get
91 * destroyed prematurely */
92 if (rds_conn_state(conn) == RDS_CONN_DISCONNECTING) {
93 /* Reject incoming connections while we're tearing
94 * down an existing one. */
95 if (event->event == RDMA_CM_EVENT_CONNECT_REQUEST)
96 ret = 1;
97 goto out;
98 }
99 }
100
101 switch (event->event) {
102 case RDMA_CM_EVENT_CONNECT_REQUEST:
103 ret = trans->cm_handle_connect(cm_id, event);
104 break;
105
106 case RDMA_CM_EVENT_ADDR_RESOLVED:
107 /* XXX do we need to clean up if this fails? */
108 ret = rdma_resolve_route(cm_id,
109 RDS_RDMA_RESOLVE_TIMEOUT_MS);
110 break;
111
112 case RDMA_CM_EVENT_ROUTE_RESOLVED:
113 /* XXX worry about racing with listen acceptance */
114 ret = trans->cm_initiate_connect(cm_id);
115 break;
116
117 case RDMA_CM_EVENT_ESTABLISHED:
118 trans->cm_connect_complete(conn, event);
119 break;
120
121 case RDMA_CM_EVENT_ADDR_ERROR:
122 case RDMA_CM_EVENT_ROUTE_ERROR:
123 case RDMA_CM_EVENT_CONNECT_ERROR:
124 case RDMA_CM_EVENT_UNREACHABLE:
125 case RDMA_CM_EVENT_REJECTED:
126 case RDMA_CM_EVENT_DEVICE_REMOVAL:
127 case RDMA_CM_EVENT_ADDR_CHANGE:
128 if (conn)
129 rds_conn_drop(conn);
130 break;
131
132 case RDMA_CM_EVENT_DISCONNECTED:
133 rdsdebug("DISCONNECT event - dropping connection "
134 "%pI4->%pI4\n", &conn->c_laddr,
135 &conn->c_faddr);
136 rds_conn_drop(conn);
137 break;
138
139 default:
140 /* things like device disconnect? */
141 printk(KERN_ERR "RDS: unknown event %u (%s)!\n",
142 event->event, rds_cm_event_str(event->event));
143 break;
144 }
145
146out:
147 if (conn)
148 mutex_unlock(&conn->c_cm_lock);
149
150 rdsdebug("id %p event %u (%s) handling ret %d\n", cm_id, event->event,
151 rds_cm_event_str(event->event), ret);
152
153 return ret;
154}
155
156static int rds_rdma_listen_init(void)
157{
158 struct sockaddr_in sin;
159 struct rdma_cm_id *cm_id;
160 int ret;
161
162 cm_id = rdma_create_id(rds_rdma_cm_event_handler, NULL, RDMA_PS_TCP,
163 IB_QPT_RC);
164 if (IS_ERR(cm_id)) {
165 ret = PTR_ERR(cm_id);
166 printk(KERN_ERR "RDS/RDMA: failed to setup listener, "
167 "rdma_create_id() returned %d\n", ret);
168 return ret;
169 }
170
171 sin.sin_family = AF_INET,
172 sin.sin_addr.s_addr = (__force u32)htonl(INADDR_ANY);
173 sin.sin_port = (__force u16)htons(RDS_PORT);
174
175 /*
176 * XXX I bet this binds the cm_id to a device. If we want to support
177 * fail-over we'll have to take this into consideration.
178 */
179 ret = rdma_bind_addr(cm_id, (struct sockaddr *)&sin);
180 if (ret) {
181 printk(KERN_ERR "RDS/RDMA: failed to setup listener, "
182 "rdma_bind_addr() returned %d\n", ret);
183 goto out;
184 }
185
186 ret = rdma_listen(cm_id, 128);
187 if (ret) {
188 printk(KERN_ERR "RDS/RDMA: failed to setup listener, "
189 "rdma_listen() returned %d\n", ret);
190 goto out;
191 }
192
193 rdsdebug("cm %p listening on port %u\n", cm_id, RDS_PORT);
194
195 rds_rdma_listen_id = cm_id;
196 cm_id = NULL;
197out:
198 if (cm_id)
199 rdma_destroy_id(cm_id);
200 return ret;
201}
202
203static void rds_rdma_listen_stop(void)
204{
205 if (rds_rdma_listen_id) {
206 rdsdebug("cm %p\n", rds_rdma_listen_id);
207 rdma_destroy_id(rds_rdma_listen_id);
208 rds_rdma_listen_id = NULL;
209 }
210}
211
212static int rds_rdma_init(void)
213{
214 int ret;
215
216 ret = rds_rdma_listen_init();
217 if (ret)
218 goto out;
219
220 ret = rds_iw_init();
221 if (ret)
222 goto err_iw_init;
223
224 ret = rds_ib_init();
225 if (ret)
226 goto err_ib_init;
227
228 goto out;
229
230err_ib_init:
231 rds_iw_exit();
232err_iw_init:
233 rds_rdma_listen_stop();
234out:
235 return ret;
236}
237module_init(rds_rdma_init);
238
239static void rds_rdma_exit(void)
240{
241 /* stop listening first to ensure no new connections are attempted */
242 rds_rdma_listen_stop();
243 rds_ib_exit();
244 rds_iw_exit();
245}
246module_exit(rds_rdma_exit);
247
248MODULE_AUTHOR("Oracle Corporation <rds-devel@oss.oracle.com>");
249MODULE_DESCRIPTION("RDS: IB/iWARP transport");
250MODULE_LICENSE("Dual BSD/GPL");
251