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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" | |
ae05368a | 37 | #include "ib.h" |
55b7ed0b | 38 | |
11bc9421 | 39 | static struct rdma_cm_id *rds_rdma_listen_id; |
55b7ed0b AG |
40 | |
41 | int 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 | ||
59f740a6 | 49 | rdsdebug("conn %p id %p handling event %u (%s)\n", conn, cm_id, |
3c88f3dc | 50 | event->event, rdma_event_msg(event->event)); |
55b7ed0b | 51 | |
dcdede04 | 52 | if (cm_id->device->node_type == RDMA_NODE_IB_CA) |
55b7ed0b AG |
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: | |
ae05368a | 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 | } | |
55b7ed0b AG |
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: | |
97069788 | 114 | rdsdebug("DISCONNECT event - dropping connection " |
55b7ed0b AG |
115 | "%pI4->%pI4\n", &conn->c_laddr, |
116 | &conn->c_faddr); | |
117 | rds_conn_drop(conn); | |
118 | break; | |
119 | ||
37ea401e | 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 | ||
55b7ed0b AG |
128 | default: |
129 | /* things like device disconnect? */ | |
59f740a6 | 130 | printk(KERN_ERR "RDS: unknown event %u (%s)!\n", |
3c88f3dc | 131 | event->event, rdma_event_msg(event->event)); |
55b7ed0b AG |
132 | break; |
133 | } | |
134 | ||
135 | out: | |
136 | if (conn) | |
137 | mutex_unlock(&conn->c_cm_lock); | |
138 | ||
59f740a6 | 139 | rdsdebug("id %p event %u (%s) handling ret %d\n", cm_id, event->event, |
3c88f3dc | 140 | rdma_event_msg(event->event), ret); |
55b7ed0b AG |
141 | |
142 | return ret; | |
143 | } | |
144 | ||
ef87b7ea | 145 | static int rds_rdma_listen_init(void) |
55b7ed0b AG |
146 | { |
147 | struct sockaddr_in sin; | |
148 | struct rdma_cm_id *cm_id; | |
149 | int ret; | |
150 | ||
fa20105e GS |
151 | cm_id = rdma_create_id(&init_net, rds_rdma_cm_event_handler, NULL, |
152 | RDMA_PS_TCP, IB_QPT_RC); | |
55b7ed0b AG |
153 | if (IS_ERR(cm_id)) { |
154 | ret = PTR_ERR(cm_id); | |
92c330b9 | 155 | printk(KERN_ERR "RDS/RDMA: failed to setup listener, " |
55b7ed0b | 156 | "rdma_create_id() returned %d\n", ret); |
24acc689 | 157 | return ret; |
55b7ed0b AG |
158 | } |
159 | ||
cc2afe9f | 160 | sin.sin_family = AF_INET; |
55b7ed0b AG |
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) { | |
92c330b9 | 170 | printk(KERN_ERR "RDS/RDMA: failed to setup listener, " |
55b7ed0b AG |
171 | "rdma_bind_addr() returned %d\n", ret); |
172 | goto out; | |
173 | } | |
174 | ||
175 | ret = rdma_listen(cm_id, 128); | |
176 | if (ret) { | |
92c330b9 | 177 | printk(KERN_ERR "RDS/RDMA: failed to setup listener, " |
55b7ed0b AG |
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 | ||
11bc9421 | 184 | rds_rdma_listen_id = cm_id; |
55b7ed0b AG |
185 | cm_id = NULL; |
186 | out: | |
187 | if (cm_id) | |
188 | rdma_destroy_id(cm_id); | |
189 | return ret; | |
190 | } | |
191 | ||
192 | static void rds_rdma_listen_stop(void) | |
193 | { | |
11bc9421 AG |
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; | |
55b7ed0b AG |
198 | } |
199 | } | |
200 | ||
ff51bf84 | 201 | static int rds_rdma_init(void) |
55b7ed0b AG |
202 | { |
203 | int ret; | |
204 | ||
205 | ret = rds_rdma_listen_init(); | |
206 | if (ret) | |
207 | goto out; | |
208 | ||
55b7ed0b AG |
209 | ret = rds_ib_init(); |
210 | if (ret) | |
211 | goto err_ib_init; | |
212 | ||
213 | goto out; | |
214 | ||
215 | err_ib_init: | |
55b7ed0b AG |
216 | rds_rdma_listen_stop(); |
217 | out: | |
218 | return ret; | |
219 | } | |
40d86609 | 220 | module_init(rds_rdma_init); |
55b7ed0b | 221 | |
ff51bf84 | 222 | static void rds_rdma_exit(void) |
55b7ed0b AG |
223 | { |
224 | /* stop listening first to ensure no new connections are attempted */ | |
225 | rds_rdma_listen_stop(); | |
226 | rds_ib_exit(); | |
55b7ed0b | 227 | } |
40d86609 AG |
228 | module_exit(rds_rdma_exit); |
229 | ||
230 | MODULE_AUTHOR("Oracle Corporation <rds-devel@oss.oracle.com>"); | |
dcdede04 | 231 | MODULE_DESCRIPTION("RDS: IB transport"); |
40d86609 | 232 | MODULE_LICENSE("Dual BSD/GPL"); |
55b7ed0b | 233 |