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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 "rds_single_path.h" | |
37 | #include "rdma_transport.h" | |
38 | #include "ib.h" | |
39 | ||
40 | static struct rdma_cm_id *rds_rdma_listen_id; | |
41 | ||
42 | int 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 | ||
139 | out: | |
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 | ||
149 | static 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; | |
190 | out: | |
191 | if (cm_id) | |
192 | rdma_destroy_id(cm_id); | |
193 | return ret; | |
194 | } | |
195 | ||
196 | static 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 | ||
205 | static int rds_rdma_init(void) | |
206 | { | |
207 | int ret; | |
208 | ||
209 | ret = rds_ib_init(); | |
210 | if (ret) | |
211 | goto out; | |
212 | ||
213 | ret = rds_rdma_listen_init(); | |
214 | if (ret) | |
215 | rds_ib_exit(); | |
216 | out: | |
217 | return ret; | |
218 | } | |
219 | module_init(rds_rdma_init); | |
220 | ||
221 | static void rds_rdma_exit(void) | |
222 | { | |
223 | /* stop listening first to ensure no new connections are attempted */ | |
224 | rds_rdma_listen_stop(); | |
225 | rds_ib_exit(); | |
226 | } | |
227 | module_exit(rds_rdma_exit); | |
228 | ||
229 | MODULE_AUTHOR("Oracle Corporation <rds-devel@oss.oracle.com>"); | |
230 | MODULE_DESCRIPTION("RDS: IB transport"); | |
231 | MODULE_LICENSE("Dual BSD/GPL"); | |
232 |