1 /*
2 * Copyright (c) 2009, 2018 Oracle and/or its affiliates. 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 /* Global IPv4 and IPv6 RDS RDMA listener cm_id */
41 static struct rdma_cm_id *rds_rdma_listen_id;
42 #if IS_ENABLED(CONFIG_IPV6)
43 static struct rdma_cm_id *rds6_rdma_listen_id;
44 #endif
45
46 /* Per IB specification 7.7.3, service level is a 4-bit field. */
47 #define TOS_TO_SL(tos) ((tos) & 0xF)
48
rds_rdma_cm_event_handler_cmn(struct rdma_cm_id * cm_id,struct rdma_cm_event * event,bool isv6)49 static int rds_rdma_cm_event_handler_cmn(struct rdma_cm_id *cm_id,
50 struct rdma_cm_event *event,
51 bool isv6)
52 {
53 /* this can be null in the listening path */
54 struct rds_connection *conn = cm_id->context;
55 struct rds_transport *trans;
56 int ret = 0;
57 int *err;
58 u8 len;
59
60 rdsdebug("conn %p id %p handling event %u (%s)\n", conn, cm_id,
61 event->event, rdma_event_msg(event->event));
62
63 if (cm_id->device->node_type == RDMA_NODE_IB_CA)
64 trans = &rds_ib_transport;
65
66 /* Prevent shutdown from tearing down the connection
67 * while we're executing. */
68 if (conn) {
69 mutex_lock(&conn->c_cm_lock);
70
71 /* If the connection is being shut down, bail out
72 * right away. We return 0 so cm_id doesn't get
73 * destroyed prematurely */
74 if (rds_conn_state(conn) == RDS_CONN_DISCONNECTING) {
75 /* Reject incoming connections while we're tearing
76 * down an existing one. */
77 if (event->event == RDMA_CM_EVENT_CONNECT_REQUEST)
78 ret = 1;
79 goto out;
80 }
81 }
82
83 switch (event->event) {
84 case RDMA_CM_EVENT_CONNECT_REQUEST:
85 ret = trans->cm_handle_connect(cm_id, event, isv6);
86 break;
87
88 case RDMA_CM_EVENT_ADDR_RESOLVED:
89 if (conn) {
90 rdma_set_service_type(cm_id, conn->c_tos);
91 /* XXX do we need to clean up if this fails? */
92 ret = rdma_resolve_route(cm_id,
93 RDS_RDMA_RESOLVE_TIMEOUT_MS);
94 }
95 break;
96
97 case RDMA_CM_EVENT_ROUTE_RESOLVED:
98 /* Connection could have been dropped so make sure the
99 * cm_id is valid before proceeding
100 */
101 if (conn) {
102 struct rds_ib_connection *ibic;
103
104 ibic = conn->c_transport_data;
105 if (ibic && ibic->i_cm_id == cm_id) {
106 cm_id->route.path_rec[0].sl =
107 TOS_TO_SL(conn->c_tos);
108 ret = trans->cm_initiate_connect(cm_id, isv6);
109 } else {
110 rds_conn_drop(conn);
111 }
112 }
113 break;
114
115 case RDMA_CM_EVENT_ESTABLISHED:
116 if (conn)
117 trans->cm_connect_complete(conn, event);
118 break;
119
120 case RDMA_CM_EVENT_REJECTED:
121 if (!conn)
122 break;
123 err = (int *)rdma_consumer_reject_data(cm_id, event, &len);
124 if (!err ||
125 (err && len >= sizeof(*err) &&
126 ((*err) <= RDS_RDMA_REJ_INCOMPAT))) {
127 pr_warn("RDS/RDMA: conn <%pI6c, %pI6c> rejected, dropping connection\n",
128 &conn->c_laddr, &conn->c_faddr);
129
130 if (!conn->c_tos)
131 conn->c_proposed_version = RDS_PROTOCOL_COMPAT_VERSION;
132
133 rds_conn_drop(conn);
134 }
135 rdsdebug("Connection rejected: %s\n",
136 rdma_reject_msg(cm_id, event->status));
137 break;
138 case RDMA_CM_EVENT_ADDR_ERROR:
139 case RDMA_CM_EVENT_ROUTE_ERROR:
140 case RDMA_CM_EVENT_CONNECT_ERROR:
141 case RDMA_CM_EVENT_UNREACHABLE:
142 case RDMA_CM_EVENT_DEVICE_REMOVAL:
143 case RDMA_CM_EVENT_ADDR_CHANGE:
144 if (conn)
145 rds_conn_drop(conn);
146 break;
147
148 case RDMA_CM_EVENT_DISCONNECTED:
149 if (!conn)
150 break;
151 rdsdebug("DISCONNECT event - dropping connection "
152 "%pI6c->%pI6c\n", &conn->c_laddr,
153 &conn->c_faddr);
154 rds_conn_drop(conn);
155 break;
156
157 case RDMA_CM_EVENT_TIMEWAIT_EXIT:
158 if (conn) {
159 pr_info("RDS: RDMA_CM_EVENT_TIMEWAIT_EXIT event: dropping connection %pI6c->%pI6c\n",
160 &conn->c_laddr, &conn->c_faddr);
161 rds_conn_drop(conn);
162 }
163 break;
164
165 default:
166 /* things like device disconnect? */
167 printk(KERN_ERR "RDS: unknown event %u (%s)!\n",
168 event->event, rdma_event_msg(event->event));
169 break;
170 }
171
172 out:
173 if (conn)
174 mutex_unlock(&conn->c_cm_lock);
175
176 rdsdebug("id %p event %u (%s) handling ret %d\n", cm_id, event->event,
177 rdma_event_msg(event->event), ret);
178
179 return ret;
180 }
181
rds_rdma_cm_event_handler(struct rdma_cm_id * cm_id,struct rdma_cm_event * event)182 int rds_rdma_cm_event_handler(struct rdma_cm_id *cm_id,
183 struct rdma_cm_event *event)
184 {
185 return rds_rdma_cm_event_handler_cmn(cm_id, event, false);
186 }
187
188 #if IS_ENABLED(CONFIG_IPV6)
rds6_rdma_cm_event_handler(struct rdma_cm_id * cm_id,struct rdma_cm_event * event)189 int rds6_rdma_cm_event_handler(struct rdma_cm_id *cm_id,
190 struct rdma_cm_event *event)
191 {
192 return rds_rdma_cm_event_handler_cmn(cm_id, event, true);
193 }
194 #endif
195
rds_rdma_listen_init_common(rdma_cm_event_handler handler,struct sockaddr * sa,struct rdma_cm_id ** ret_cm_id)196 static int rds_rdma_listen_init_common(rdma_cm_event_handler handler,
197 struct sockaddr *sa,
198 struct rdma_cm_id **ret_cm_id)
199 {
200 struct rdma_cm_id *cm_id;
201 int ret;
202
203 cm_id = rdma_create_id(&init_net, handler, NULL,
204 RDMA_PS_TCP, IB_QPT_RC);
205 if (IS_ERR(cm_id)) {
206 ret = PTR_ERR(cm_id);
207 printk(KERN_ERR "RDS/RDMA: failed to setup listener, "
208 "rdma_create_id() returned %d\n", ret);
209 return ret;
210 }
211
212 /*
213 * XXX I bet this binds the cm_id to a device. If we want to support
214 * fail-over we'll have to take this into consideration.
215 */
216 ret = rdma_bind_addr(cm_id, sa);
217 if (ret) {
218 printk(KERN_ERR "RDS/RDMA: failed to setup listener, "
219 "rdma_bind_addr() returned %d\n", ret);
220 goto out;
221 }
222
223 ret = rdma_listen(cm_id, 128);
224 if (ret) {
225 printk(KERN_ERR "RDS/RDMA: failed to setup listener, "
226 "rdma_listen() returned %d\n", ret);
227 goto out;
228 }
229
230 rdsdebug("cm %p listening on port %u\n", cm_id, RDS_PORT);
231
232 *ret_cm_id = cm_id;
233 cm_id = NULL;
234 out:
235 if (cm_id)
236 rdma_destroy_id(cm_id);
237 return ret;
238 }
239
240 /* Initialize the RDS RDMA listeners. We create two listeners for
241 * compatibility reason. The one on RDS_PORT is used for IPv4
242 * requests only. The one on RDS_CM_PORT is used for IPv6 requests
243 * only. So only IPv6 enabled RDS module will communicate using this
244 * port.
245 */
rds_rdma_listen_init(void)246 static int rds_rdma_listen_init(void)
247 {
248 int ret;
249 #if IS_ENABLED(CONFIG_IPV6)
250 struct sockaddr_in6 sin6;
251 #endif
252 struct sockaddr_in sin;
253
254 sin.sin_family = PF_INET;
255 sin.sin_addr.s_addr = htonl(INADDR_ANY);
256 sin.sin_port = htons(RDS_PORT);
257 ret = rds_rdma_listen_init_common(rds_rdma_cm_event_handler,
258 (struct sockaddr *)&sin,
259 &rds_rdma_listen_id);
260 if (ret != 0)
261 return ret;
262
263 #if IS_ENABLED(CONFIG_IPV6)
264 sin6.sin6_family = PF_INET6;
265 sin6.sin6_addr = in6addr_any;
266 sin6.sin6_port = htons(RDS_CM_PORT);
267 sin6.sin6_scope_id = 0;
268 sin6.sin6_flowinfo = 0;
269 ret = rds_rdma_listen_init_common(rds6_rdma_cm_event_handler,
270 (struct sockaddr *)&sin6,
271 &rds6_rdma_listen_id);
272 /* Keep going even when IPv6 is not enabled in the system. */
273 if (ret != 0)
274 rdsdebug("Cannot set up IPv6 RDMA listener\n");
275 #endif
276 return 0;
277 }
278
rds_rdma_listen_stop(void)279 static void rds_rdma_listen_stop(void)
280 {
281 if (rds_rdma_listen_id) {
282 rdsdebug("cm %p\n", rds_rdma_listen_id);
283 rdma_destroy_id(rds_rdma_listen_id);
284 rds_rdma_listen_id = NULL;
285 }
286 #if IS_ENABLED(CONFIG_IPV6)
287 if (rds6_rdma_listen_id) {
288 rdsdebug("cm %p\n", rds6_rdma_listen_id);
289 rdma_destroy_id(rds6_rdma_listen_id);
290 rds6_rdma_listen_id = NULL;
291 }
292 #endif
293 }
294
rds_rdma_init(void)295 static int rds_rdma_init(void)
296 {
297 int ret;
298
299 ret = rds_ib_init();
300 if (ret)
301 goto out;
302
303 ret = rds_rdma_listen_init();
304 if (ret)
305 rds_ib_exit();
306 out:
307 return ret;
308 }
309 module_init(rds_rdma_init);
310
rds_rdma_exit(void)311 static void rds_rdma_exit(void)
312 {
313 /* stop listening first to ensure no new connections are attempted */
314 rds_rdma_listen_stop();
315 rds_ib_exit();
316 }
317 module_exit(rds_rdma_exit);
318
319 MODULE_AUTHOR("Oracle Corporation <rds-devel@oss.oracle.com>");
320 MODULE_DESCRIPTION("RDS: IB transport");
321 MODULE_LICENSE("Dual BSD/GPL");
322