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55b7ed0b | 1 | /* |
eee2fa6a | 2 | * Copyright (c) 2009, 2018 Oracle and/or its affiliates. All rights reserved. |
55b7ed0b AG |
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 | ||
0cb43965 | 36 | #include "rds_single_path.h" |
55b7ed0b | 37 | #include "rdma_transport.h" |
ae05368a | 38 | #include "ib.h" |
55b7ed0b | 39 | |
1e2b44e7 | 40 | /* Global IPv4 and IPv6 RDS RDMA listener cm_id */ |
11bc9421 | 41 | static struct rdma_cm_id *rds_rdma_listen_id; |
e65d4d96 | 42 | #if IS_ENABLED(CONFIG_IPV6) |
1e2b44e7 | 43 | static struct rdma_cm_id *rds6_rdma_listen_id; |
e65d4d96 | 44 | #endif |
55b7ed0b | 45 | |
eee2fa6a KCP |
46 | static int rds_rdma_cm_event_handler_cmn(struct rdma_cm_id *cm_id, |
47 | struct rdma_cm_event *event, | |
48 | bool isv6) | |
55b7ed0b AG |
49 | { |
50 | /* this can be null in the listening path */ | |
51 | struct rds_connection *conn = cm_id->context; | |
52 | struct rds_transport *trans; | |
53 | int ret = 0; | |
d021fabf SS |
54 | int *err; |
55 | u8 len; | |
55b7ed0b | 56 | |
59f740a6 | 57 | rdsdebug("conn %p id %p handling event %u (%s)\n", conn, cm_id, |
3c88f3dc | 58 | event->event, rdma_event_msg(event->event)); |
55b7ed0b | 59 | |
dcdede04 | 60 | if (cm_id->device->node_type == RDMA_NODE_IB_CA) |
55b7ed0b AG |
61 | trans = &rds_ib_transport; |
62 | ||
63 | /* Prevent shutdown from tearing down the connection | |
64 | * while we're executing. */ | |
65 | if (conn) { | |
66 | mutex_lock(&conn->c_cm_lock); | |
67 | ||
68 | /* If the connection is being shut down, bail out | |
69 | * right away. We return 0 so cm_id doesn't get | |
70 | * destroyed prematurely */ | |
71 | if (rds_conn_state(conn) == RDS_CONN_DISCONNECTING) { | |
72 | /* Reject incoming connections while we're tearing | |
73 | * down an existing one. */ | |
74 | if (event->event == RDMA_CM_EVENT_CONNECT_REQUEST) | |
75 | ret = 1; | |
76 | goto out; | |
77 | } | |
78 | } | |
79 | ||
80 | switch (event->event) { | |
81 | case RDMA_CM_EVENT_CONNECT_REQUEST: | |
eee2fa6a | 82 | ret = trans->cm_handle_connect(cm_id, event, isv6); |
55b7ed0b AG |
83 | break; |
84 | ||
85 | case RDMA_CM_EVENT_ADDR_RESOLVED: | |
fd261ce6 | 86 | rdma_set_service_type(cm_id, conn->c_tos); |
55b7ed0b AG |
87 | /* XXX do we need to clean up if this fails? */ |
88 | ret = rdma_resolve_route(cm_id, | |
89 | RDS_RDMA_RESOLVE_TIMEOUT_MS); | |
90 | break; | |
91 | ||
92 | case RDMA_CM_EVENT_ROUTE_RESOLVED: | |
ae05368a | 93 | /* Connection could have been dropped so make sure the |
94 | * cm_id is valid before proceeding | |
95 | */ | |
96 | if (conn) { | |
97 | struct rds_ib_connection *ibic; | |
98 | ||
99 | ibic = conn->c_transport_data; | |
100 | if (ibic && ibic->i_cm_id == cm_id) | |
eee2fa6a | 101 | ret = trans->cm_initiate_connect(cm_id, isv6); |
ae05368a | 102 | else |
103 | rds_conn_drop(conn); | |
104 | } | |
55b7ed0b AG |
105 | break; |
106 | ||
107 | case RDMA_CM_EVENT_ESTABLISHED: | |
108 | trans->cm_connect_complete(conn, event); | |
109 | break; | |
110 | ||
39384f04 | 111 | case RDMA_CM_EVENT_REJECTED: |
d021fabf SS |
112 | if (!conn) |
113 | break; | |
114 | err = (int *)rdma_consumer_reject_data(cm_id, event, &len); | |
8c6166cf GR |
115 | if (!err || |
116 | (err && len >= sizeof(*err) && | |
117 | ((*err) <= RDS_RDMA_REJ_INCOMPAT))) { | |
d021fabf SS |
118 | pr_warn("RDS/RDMA: conn <%pI6c, %pI6c> rejected, dropping connection\n", |
119 | &conn->c_laddr, &conn->c_faddr); | |
dc205a8d SS |
120 | |
121 | if (!conn->c_tos) | |
122 | conn->c_proposed_version = RDS_PROTOCOL_COMPAT_VERSION; | |
123 | ||
d021fabf SS |
124 | rds_conn_drop(conn); |
125 | } | |
39384f04 SW |
126 | rdsdebug("Connection rejected: %s\n", |
127 | rdma_reject_msg(cm_id, event->status)); | |
d021fabf | 128 | break; |
55b7ed0b AG |
129 | case RDMA_CM_EVENT_ADDR_ERROR: |
130 | case RDMA_CM_EVENT_ROUTE_ERROR: | |
131 | case RDMA_CM_EVENT_CONNECT_ERROR: | |
132 | case RDMA_CM_EVENT_UNREACHABLE: | |
55b7ed0b AG |
133 | case RDMA_CM_EVENT_DEVICE_REMOVAL: |
134 | case RDMA_CM_EVENT_ADDR_CHANGE: | |
135 | if (conn) | |
136 | rds_conn_drop(conn); | |
137 | break; | |
138 | ||
139 | case RDMA_CM_EVENT_DISCONNECTED: | |
97069788 | 140 | rdsdebug("DISCONNECT event - dropping connection " |
eee2fa6a | 141 | "%pI6c->%pI6c\n", &conn->c_laddr, |
55b7ed0b AG |
142 | &conn->c_faddr); |
143 | rds_conn_drop(conn); | |
144 | break; | |
145 | ||
37ea401e | 146 | case RDMA_CM_EVENT_TIMEWAIT_EXIT: |
147 | if (conn) { | |
eee2fa6a | 148 | pr_info("RDS: RDMA_CM_EVENT_TIMEWAIT_EXIT event: dropping connection %pI6c->%pI6c\n", |
37ea401e | 149 | &conn->c_laddr, &conn->c_faddr); |
150 | rds_conn_drop(conn); | |
151 | } | |
152 | break; | |
153 | ||
55b7ed0b AG |
154 | default: |
155 | /* things like device disconnect? */ | |
59f740a6 | 156 | printk(KERN_ERR "RDS: unknown event %u (%s)!\n", |
3c88f3dc | 157 | event->event, rdma_event_msg(event->event)); |
55b7ed0b AG |
158 | break; |
159 | } | |
160 | ||
161 | out: | |
162 | if (conn) | |
163 | mutex_unlock(&conn->c_cm_lock); | |
164 | ||
59f740a6 | 165 | rdsdebug("id %p event %u (%s) handling ret %d\n", cm_id, event->event, |
3c88f3dc | 166 | rdma_event_msg(event->event), ret); |
55b7ed0b AG |
167 | |
168 | return ret; | |
169 | } | |
170 | ||
eee2fa6a KCP |
171 | int rds_rdma_cm_event_handler(struct rdma_cm_id *cm_id, |
172 | struct rdma_cm_event *event) | |
173 | { | |
174 | return rds_rdma_cm_event_handler_cmn(cm_id, event, false); | |
175 | } | |
176 | ||
e65d4d96 | 177 | #if IS_ENABLED(CONFIG_IPV6) |
1e2b44e7 KCP |
178 | int rds6_rdma_cm_event_handler(struct rdma_cm_id *cm_id, |
179 | struct rdma_cm_event *event) | |
180 | { | |
181 | return rds_rdma_cm_event_handler_cmn(cm_id, event, true); | |
182 | } | |
e65d4d96 | 183 | #endif |
1e2b44e7 | 184 | |
eee2fa6a KCP |
185 | static int rds_rdma_listen_init_common(rdma_cm_event_handler handler, |
186 | struct sockaddr *sa, | |
187 | struct rdma_cm_id **ret_cm_id) | |
55b7ed0b | 188 | { |
55b7ed0b AG |
189 | struct rdma_cm_id *cm_id; |
190 | int ret; | |
191 | ||
eee2fa6a | 192 | cm_id = rdma_create_id(&init_net, handler, NULL, |
fa20105e | 193 | RDMA_PS_TCP, IB_QPT_RC); |
55b7ed0b AG |
194 | if (IS_ERR(cm_id)) { |
195 | ret = PTR_ERR(cm_id); | |
92c330b9 | 196 | printk(KERN_ERR "RDS/RDMA: failed to setup listener, " |
55b7ed0b | 197 | "rdma_create_id() returned %d\n", ret); |
24acc689 | 198 | return ret; |
55b7ed0b AG |
199 | } |
200 | ||
55b7ed0b AG |
201 | /* |
202 | * XXX I bet this binds the cm_id to a device. If we want to support | |
203 | * fail-over we'll have to take this into consideration. | |
204 | */ | |
eee2fa6a | 205 | ret = rdma_bind_addr(cm_id, sa); |
55b7ed0b | 206 | if (ret) { |
92c330b9 | 207 | printk(KERN_ERR "RDS/RDMA: failed to setup listener, " |
55b7ed0b AG |
208 | "rdma_bind_addr() returned %d\n", ret); |
209 | goto out; | |
210 | } | |
211 | ||
212 | ret = rdma_listen(cm_id, 128); | |
213 | if (ret) { | |
92c330b9 | 214 | printk(KERN_ERR "RDS/RDMA: failed to setup listener, " |
55b7ed0b AG |
215 | "rdma_listen() returned %d\n", ret); |
216 | goto out; | |
217 | } | |
218 | ||
219 | rdsdebug("cm %p listening on port %u\n", cm_id, RDS_PORT); | |
220 | ||
eee2fa6a | 221 | *ret_cm_id = cm_id; |
55b7ed0b AG |
222 | cm_id = NULL; |
223 | out: | |
224 | if (cm_id) | |
225 | rdma_destroy_id(cm_id); | |
226 | return ret; | |
227 | } | |
228 | ||
eee2fa6a KCP |
229 | /* Initialize the RDS RDMA listeners. We create two listeners for |
230 | * compatibility reason. The one on RDS_PORT is used for IPv4 | |
231 | * requests only. The one on RDS_CM_PORT is used for IPv6 requests | |
232 | * only. So only IPv6 enabled RDS module will communicate using this | |
233 | * port. | |
234 | */ | |
235 | static int rds_rdma_listen_init(void) | |
236 | { | |
237 | int ret; | |
e65d4d96 | 238 | #if IS_ENABLED(CONFIG_IPV6) |
1e2b44e7 | 239 | struct sockaddr_in6 sin6; |
e65d4d96 | 240 | #endif |
eee2fa6a KCP |
241 | struct sockaddr_in sin; |
242 | ||
243 | sin.sin_family = PF_INET; | |
244 | sin.sin_addr.s_addr = htonl(INADDR_ANY); | |
245 | sin.sin_port = htons(RDS_PORT); | |
246 | ret = rds_rdma_listen_init_common(rds_rdma_cm_event_handler, | |
247 | (struct sockaddr *)&sin, | |
248 | &rds_rdma_listen_id); | |
1e2b44e7 KCP |
249 | if (ret != 0) |
250 | return ret; | |
251 | ||
e65d4d96 | 252 | #if IS_ENABLED(CONFIG_IPV6) |
1e2b44e7 KCP |
253 | sin6.sin6_family = PF_INET6; |
254 | sin6.sin6_addr = in6addr_any; | |
255 | sin6.sin6_port = htons(RDS_CM_PORT); | |
256 | sin6.sin6_scope_id = 0; | |
257 | sin6.sin6_flowinfo = 0; | |
258 | ret = rds_rdma_listen_init_common(rds6_rdma_cm_event_handler, | |
259 | (struct sockaddr *)&sin6, | |
260 | &rds6_rdma_listen_id); | |
261 | /* Keep going even when IPv6 is not enabled in the system. */ | |
262 | if (ret != 0) | |
263 | rdsdebug("Cannot set up IPv6 RDMA listener\n"); | |
e65d4d96 | 264 | #endif |
1e2b44e7 | 265 | return 0; |
eee2fa6a KCP |
266 | } |
267 | ||
55b7ed0b AG |
268 | static void rds_rdma_listen_stop(void) |
269 | { | |
11bc9421 AG |
270 | if (rds_rdma_listen_id) { |
271 | rdsdebug("cm %p\n", rds_rdma_listen_id); | |
272 | rdma_destroy_id(rds_rdma_listen_id); | |
273 | rds_rdma_listen_id = NULL; | |
55b7ed0b | 274 | } |
e65d4d96 | 275 | #if IS_ENABLED(CONFIG_IPV6) |
1e2b44e7 KCP |
276 | if (rds6_rdma_listen_id) { |
277 | rdsdebug("cm %p\n", rds6_rdma_listen_id); | |
278 | rdma_destroy_id(rds6_rdma_listen_id); | |
279 | rds6_rdma_listen_id = NULL; | |
280 | } | |
e65d4d96 | 281 | #endif |
55b7ed0b AG |
282 | } |
283 | ||
ff51bf84 | 284 | static int rds_rdma_init(void) |
55b7ed0b AG |
285 | { |
286 | int ret; | |
287 | ||
8d5d8a5f | 288 | ret = rds_ib_init(); |
55b7ed0b AG |
289 | if (ret) |
290 | goto out; | |
291 | ||
8d5d8a5f | 292 | ret = rds_rdma_listen_init(); |
55b7ed0b | 293 | if (ret) |
8d5d8a5f | 294 | rds_ib_exit(); |
55b7ed0b AG |
295 | out: |
296 | return ret; | |
297 | } | |
40d86609 | 298 | module_init(rds_rdma_init); |
55b7ed0b | 299 | |
ff51bf84 | 300 | static void rds_rdma_exit(void) |
55b7ed0b AG |
301 | { |
302 | /* stop listening first to ensure no new connections are attempted */ | |
303 | rds_rdma_listen_stop(); | |
304 | rds_ib_exit(); | |
55b7ed0b | 305 | } |
40d86609 AG |
306 | module_exit(rds_rdma_exit); |
307 | ||
308 | MODULE_AUTHOR("Oracle Corporation <rds-devel@oss.oracle.com>"); | |
dcdede04 | 309 | MODULE_DESCRIPTION("RDS: IB transport"); |
40d86609 | 310 | MODULE_LICENSE("Dual BSD/GPL"); |