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55b7ed0b AG |
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 | ||
11bc9421 | 37 | static struct rdma_cm_id *rds_rdma_listen_id; |
55b7ed0b | 38 | |
59f740a6 ZB |
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 | ||
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 | ||
55b7ed0b AG |
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 | ||
59f740a6 ZB |
75 | rdsdebug("conn %p id %p handling event %u (%s)\n", conn, cm_id, |
76 | event->event, rds_cm_event_str(event->event)); | |
55b7ed0b AG |
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: | |
97069788 | 132 | rdsdebug("DISCONNECT event - dropping connection " |
55b7ed0b AG |
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? */ | |
59f740a6 ZB |
140 | printk(KERN_ERR "RDS: unknown event %u (%s)!\n", |
141 | event->event, rds_cm_event_str(event->event)); | |
55b7ed0b AG |
142 | break; |
143 | } | |
144 | ||
145 | out: | |
146 | if (conn) | |
147 | mutex_unlock(&conn->c_cm_lock); | |
148 | ||
59f740a6 ZB |
149 | rdsdebug("id %p event %u (%s) handling ret %d\n", cm_id, event->event, |
150 | rds_cm_event_str(event->event), ret); | |
55b7ed0b AG |
151 | |
152 | return ret; | |
153 | } | |
154 | ||
ef87b7ea | 155 | static int rds_rdma_listen_init(void) |
55b7ed0b AG |
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); | |
92c330b9 | 164 | printk(KERN_ERR "RDS/RDMA: failed to setup listener, " |
55b7ed0b | 165 | "rdma_create_id() returned %d\n", ret); |
24acc689 | 166 | return ret; |
55b7ed0b AG |
167 | } |
168 | ||
3d7ddd54 | 169 | sin.sin_family = AF_INET, |
55b7ed0b AG |
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) { | |
92c330b9 | 179 | printk(KERN_ERR "RDS/RDMA: failed to setup listener, " |
55b7ed0b AG |
180 | "rdma_bind_addr() returned %d\n", ret); |
181 | goto out; | |
182 | } | |
183 | ||
184 | ret = rdma_listen(cm_id, 128); | |
185 | if (ret) { | |
92c330b9 | 186 | printk(KERN_ERR "RDS/RDMA: failed to setup listener, " |
55b7ed0b AG |
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 | ||
11bc9421 | 193 | rds_rdma_listen_id = cm_id; |
55b7ed0b AG |
194 | cm_id = NULL; |
195 | out: | |
196 | if (cm_id) | |
197 | rdma_destroy_id(cm_id); | |
198 | return ret; | |
199 | } | |
200 | ||
201 | static void rds_rdma_listen_stop(void) | |
202 | { | |
11bc9421 AG |
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; | |
55b7ed0b AG |
207 | } |
208 | } | |
209 | ||
ff51bf84 | 210 | static int rds_rdma_init(void) |
55b7ed0b AG |
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 | } | |
40d86609 | 235 | module_init(rds_rdma_init); |
55b7ed0b | 236 | |
ff51bf84 | 237 | static void rds_rdma_exit(void) |
55b7ed0b AG |
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 | } | |
40d86609 AG |
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"); | |
55b7ed0b | 249 |