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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 | */ | |
3a9a231d | 33 | #include <linux/module.h> |
55b7ed0b AG |
34 | #include <rdma/rdma_cm.h> |
35 | ||
36 | #include "rdma_transport.h" | |
37 | ||
11bc9421 | 38 | static struct rdma_cm_id *rds_rdma_listen_id; |
55b7ed0b AG |
39 | |
40 | int rds_rdma_cm_event_handler(struct rdma_cm_id *cm_id, | |
41 | struct rdma_cm_event *event) | |
42 | { | |
43 | /* this can be null in the listening path */ | |
44 | struct rds_connection *conn = cm_id->context; | |
45 | struct rds_transport *trans; | |
46 | int ret = 0; | |
47 | ||
59f740a6 | 48 | rdsdebug("conn %p id %p handling event %u (%s)\n", conn, cm_id, |
3c88f3dc | 49 | event->event, rdma_event_msg(event->event)); |
55b7ed0b AG |
50 | |
51 | if (cm_id->device->node_type == RDMA_NODE_RNIC) | |
52 | trans = &rds_iw_transport; | |
53 | else | |
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 | /* XXX worry about racing with listen acceptance */ | |
86 | ret = trans->cm_initiate_connect(cm_id); | |
87 | break; | |
88 | ||
89 | case RDMA_CM_EVENT_ESTABLISHED: | |
90 | trans->cm_connect_complete(conn, event); | |
91 | break; | |
92 | ||
93 | case RDMA_CM_EVENT_ADDR_ERROR: | |
94 | case RDMA_CM_EVENT_ROUTE_ERROR: | |
95 | case RDMA_CM_EVENT_CONNECT_ERROR: | |
96 | case RDMA_CM_EVENT_UNREACHABLE: | |
97 | case RDMA_CM_EVENT_REJECTED: | |
98 | case RDMA_CM_EVENT_DEVICE_REMOVAL: | |
99 | case RDMA_CM_EVENT_ADDR_CHANGE: | |
100 | if (conn) | |
101 | rds_conn_drop(conn); | |
102 | break; | |
103 | ||
104 | case RDMA_CM_EVENT_DISCONNECTED: | |
97069788 | 105 | rdsdebug("DISCONNECT event - dropping connection " |
55b7ed0b AG |
106 | "%pI4->%pI4\n", &conn->c_laddr, |
107 | &conn->c_faddr); | |
108 | rds_conn_drop(conn); | |
109 | break; | |
110 | ||
111 | default: | |
112 | /* things like device disconnect? */ | |
59f740a6 | 113 | printk(KERN_ERR "RDS: unknown event %u (%s)!\n", |
3c88f3dc | 114 | event->event, rdma_event_msg(event->event)); |
55b7ed0b AG |
115 | break; |
116 | } | |
117 | ||
118 | out: | |
119 | if (conn) | |
120 | mutex_unlock(&conn->c_cm_lock); | |
121 | ||
59f740a6 | 122 | rdsdebug("id %p event %u (%s) handling ret %d\n", cm_id, event->event, |
3c88f3dc | 123 | rdma_event_msg(event->event), ret); |
55b7ed0b AG |
124 | |
125 | return ret; | |
126 | } | |
127 | ||
ef87b7ea | 128 | static int rds_rdma_listen_init(void) |
55b7ed0b AG |
129 | { |
130 | struct sockaddr_in sin; | |
131 | struct rdma_cm_id *cm_id; | |
132 | int ret; | |
133 | ||
b26f9b99 SH |
134 | cm_id = rdma_create_id(rds_rdma_cm_event_handler, NULL, RDMA_PS_TCP, |
135 | IB_QPT_RC); | |
55b7ed0b AG |
136 | if (IS_ERR(cm_id)) { |
137 | ret = PTR_ERR(cm_id); | |
92c330b9 | 138 | printk(KERN_ERR "RDS/RDMA: failed to setup listener, " |
55b7ed0b | 139 | "rdma_create_id() returned %d\n", ret); |
24acc689 | 140 | return ret; |
55b7ed0b AG |
141 | } |
142 | ||
cc2afe9f | 143 | sin.sin_family = AF_INET; |
55b7ed0b AG |
144 | sin.sin_addr.s_addr = (__force u32)htonl(INADDR_ANY); |
145 | sin.sin_port = (__force u16)htons(RDS_PORT); | |
146 | ||
147 | /* | |
148 | * XXX I bet this binds the cm_id to a device. If we want to support | |
149 | * fail-over we'll have to take this into consideration. | |
150 | */ | |
151 | ret = rdma_bind_addr(cm_id, (struct sockaddr *)&sin); | |
152 | if (ret) { | |
92c330b9 | 153 | printk(KERN_ERR "RDS/RDMA: failed to setup listener, " |
55b7ed0b AG |
154 | "rdma_bind_addr() returned %d\n", ret); |
155 | goto out; | |
156 | } | |
157 | ||
158 | ret = rdma_listen(cm_id, 128); | |
159 | if (ret) { | |
92c330b9 | 160 | printk(KERN_ERR "RDS/RDMA: failed to setup listener, " |
55b7ed0b AG |
161 | "rdma_listen() returned %d\n", ret); |
162 | goto out; | |
163 | } | |
164 | ||
165 | rdsdebug("cm %p listening on port %u\n", cm_id, RDS_PORT); | |
166 | ||
11bc9421 | 167 | rds_rdma_listen_id = cm_id; |
55b7ed0b AG |
168 | cm_id = NULL; |
169 | out: | |
170 | if (cm_id) | |
171 | rdma_destroy_id(cm_id); | |
172 | return ret; | |
173 | } | |
174 | ||
175 | static void rds_rdma_listen_stop(void) | |
176 | { | |
11bc9421 AG |
177 | if (rds_rdma_listen_id) { |
178 | rdsdebug("cm %p\n", rds_rdma_listen_id); | |
179 | rdma_destroy_id(rds_rdma_listen_id); | |
180 | rds_rdma_listen_id = NULL; | |
55b7ed0b AG |
181 | } |
182 | } | |
183 | ||
ff51bf84 | 184 | static int rds_rdma_init(void) |
55b7ed0b AG |
185 | { |
186 | int ret; | |
187 | ||
188 | ret = rds_rdma_listen_init(); | |
189 | if (ret) | |
190 | goto out; | |
191 | ||
192 | ret = rds_iw_init(); | |
193 | if (ret) | |
194 | goto err_iw_init; | |
195 | ||
196 | ret = rds_ib_init(); | |
197 | if (ret) | |
198 | goto err_ib_init; | |
199 | ||
200 | goto out; | |
201 | ||
202 | err_ib_init: | |
203 | rds_iw_exit(); | |
204 | err_iw_init: | |
205 | rds_rdma_listen_stop(); | |
206 | out: | |
207 | return ret; | |
208 | } | |
40d86609 | 209 | module_init(rds_rdma_init); |
55b7ed0b | 210 | |
ff51bf84 | 211 | static void rds_rdma_exit(void) |
55b7ed0b AG |
212 | { |
213 | /* stop listening first to ensure no new connections are attempted */ | |
214 | rds_rdma_listen_stop(); | |
215 | rds_ib_exit(); | |
216 | rds_iw_exit(); | |
217 | } | |
40d86609 AG |
218 | module_exit(rds_rdma_exit); |
219 | ||
220 | MODULE_AUTHOR("Oracle Corporation <rds-devel@oss.oracle.com>"); | |
221 | MODULE_DESCRIPTION("RDS: IB/iWARP transport"); | |
222 | MODULE_LICENSE("Dual BSD/GPL"); | |
55b7ed0b | 223 |