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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 "rdma_transport.h"
37#include "ib.h"
38
39static struct rdma_cm_id *rds_rdma_listen_id;
40
41int rds_rdma_cm_event_handler(struct rdma_cm_id *cm_id,
42 struct rdma_cm_event *event)
43{
44 /* this can be null in the listening path */
45 struct rds_connection *conn = cm_id->context;
46 struct rds_transport *trans;
47 int ret = 0;
48
49 rdsdebug("conn %p id %p handling event %u (%s)\n", conn, cm_id,
50 event->event, rdma_event_msg(event->event));
51
52 if (cm_id->device->node_type == RDMA_NODE_IB_CA)
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 /* XXX do we need to clean up if this fails? */
79 ret = rdma_resolve_route(cm_id,
80 RDS_RDMA_RESOLVE_TIMEOUT_MS);
81 break;
82
83 case RDMA_CM_EVENT_ROUTE_RESOLVED:
84 /* Connection could have been dropped so make sure the
85 * cm_id is valid before proceeding
86 */
87 if (conn) {
88 struct rds_ib_connection *ibic;
89
90 ibic = conn->c_transport_data;
91 if (ibic && ibic->i_cm_id == cm_id)
92 ret = trans->cm_initiate_connect(cm_id);
93 else
94 rds_conn_drop(conn);
95 }
96 break;
97
98 case RDMA_CM_EVENT_ESTABLISHED:
99 trans->cm_connect_complete(conn, event);
100 break;
101
102 case RDMA_CM_EVENT_ADDR_ERROR:
103 case RDMA_CM_EVENT_ROUTE_ERROR:
104 case RDMA_CM_EVENT_CONNECT_ERROR:
105 case RDMA_CM_EVENT_UNREACHABLE:
106 case RDMA_CM_EVENT_REJECTED:
107 case RDMA_CM_EVENT_DEVICE_REMOVAL:
108 case RDMA_CM_EVENT_ADDR_CHANGE:
109 if (conn)
110 rds_conn_drop(conn);
111 break;
112
113 case RDMA_CM_EVENT_DISCONNECTED:
114 rdsdebug("DISCONNECT event - dropping connection "
115 "%pI4->%pI4\n", &conn->c_laddr,
116 &conn->c_faddr);
117 rds_conn_drop(conn);
118 break;
119
120 case RDMA_CM_EVENT_TIMEWAIT_EXIT:
121 if (conn) {
122 pr_info("RDS: RDMA_CM_EVENT_TIMEWAIT_EXIT event: dropping connection %pI4->%pI4\n",
123 &conn->c_laddr, &conn->c_faddr);
124 rds_conn_drop(conn);
125 }
126 break;
127
128 default:
129 /* things like device disconnect? */
130 printk(KERN_ERR "RDS: unknown event %u (%s)!\n",
131 event->event, rdma_event_msg(event->event));
132 break;
133 }
134
135out:
136 if (conn)
137 mutex_unlock(&conn->c_cm_lock);
138
139 rdsdebug("id %p event %u (%s) handling ret %d\n", cm_id, event->event,
140 rdma_event_msg(event->event), ret);
141
142 return ret;
143}
144
145static int rds_rdma_listen_init(void)
146{
147 struct sockaddr_in sin;
148 struct rdma_cm_id *cm_id;
149 int ret;
150
151 cm_id = rdma_create_id(&init_net, rds_rdma_cm_event_handler, NULL,
152 RDMA_PS_TCP, IB_QPT_RC);
153 if (IS_ERR(cm_id)) {
154 ret = PTR_ERR(cm_id);
155 printk(KERN_ERR "RDS/RDMA: failed to setup listener, "
156 "rdma_create_id() returned %d\n", ret);
157 return ret;
158 }
159
160 sin.sin_family = AF_INET;
161 sin.sin_addr.s_addr = (__force u32)htonl(INADDR_ANY);
162 sin.sin_port = (__force u16)htons(RDS_PORT);
163
164 /*
165 * XXX I bet this binds the cm_id to a device. If we want to support
166 * fail-over we'll have to take this into consideration.
167 */
168 ret = rdma_bind_addr(cm_id, (struct sockaddr *)&sin);
169 if (ret) {
170 printk(KERN_ERR "RDS/RDMA: failed to setup listener, "
171 "rdma_bind_addr() returned %d\n", ret);
172 goto out;
173 }
174
175 ret = rdma_listen(cm_id, 128);
176 if (ret) {
177 printk(KERN_ERR "RDS/RDMA: failed to setup listener, "
178 "rdma_listen() returned %d\n", ret);
179 goto out;
180 }
181
182 rdsdebug("cm %p listening on port %u\n", cm_id, RDS_PORT);
183
184 rds_rdma_listen_id = cm_id;
185 cm_id = NULL;
186out:
187 if (cm_id)
188 rdma_destroy_id(cm_id);
189 return ret;
190}
191
192static void rds_rdma_listen_stop(void)
193{
194 if (rds_rdma_listen_id) {
195 rdsdebug("cm %p\n", rds_rdma_listen_id);
196 rdma_destroy_id(rds_rdma_listen_id);
197 rds_rdma_listen_id = NULL;
198 }
199}
200
201static int rds_rdma_init(void)
202{
203 int ret;
204
205 ret = rds_rdma_listen_init();
206 if (ret)
207 goto out;
208
209 ret = rds_ib_init();
210 if (ret)
211 goto err_ib_init;
212
213 goto out;
214
215err_ib_init:
216 rds_rdma_listen_stop();
217out:
218 return ret;
219}
220module_init(rds_rdma_init);
221
222static void rds_rdma_exit(void)
223{
224 /* stop listening first to ensure no new connections are attempted */
225 rds_rdma_listen_stop();
226 rds_ib_exit();
227}
228module_exit(rds_rdma_exit);
229
230MODULE_AUTHOR("Oracle Corporation <rds-devel@oss.oracle.com>");
231MODULE_DESCRIPTION("RDS: IB transport");
232MODULE_LICENSE("Dual BSD/GPL");
233
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
40static struct rdma_cm_id *rds_rdma_listen_id;
41
42int 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
139out:
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
149static 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;
190out:
191 if (cm_id)
192 rdma_destroy_id(cm_id);
193 return ret;
194}
195
196static 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
205static int rds_rdma_init(void)
206{
207 int ret;
208
209 ret = rds_rdma_listen_init();
210 if (ret)
211 goto out;
212
213 ret = rds_ib_init();
214 if (ret)
215 goto err_ib_init;
216
217 goto out;
218
219err_ib_init:
220 rds_rdma_listen_stop();
221out:
222 return ret;
223}
224module_init(rds_rdma_init);
225
226static void rds_rdma_exit(void)
227{
228 /* stop listening first to ensure no new connections are attempted */
229 rds_rdma_listen_stop();
230 rds_ib_exit();
231}
232module_exit(rds_rdma_exit);
233
234MODULE_AUTHOR("Oracle Corporation <rds-devel@oss.oracle.com>");
235MODULE_DESCRIPTION("RDS: IB transport");
236MODULE_LICENSE("Dual BSD/GPL");
237