blob: a9e4ff948a7d69a4c9ade67c482e2f7df25eebdb [file] [log] [blame]
Andy Grover55b7ed02009-02-24 15:30:37 +00001/*
Ka-Cheong Pooneee2fa62018-07-23 20:51:21 -07002 * Copyright (c) 2009, 2018 Oracle and/or its affiliates. All rights reserved.
Andy Grover55b7ed02009-02-24 15:30:37 +00003 *
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 */
Paul Gortmaker3a9a2312011-05-27 09:12:25 -040033#include <linux/module.h>
Andy Grover55b7ed02009-02-24 15:30:37 +000034#include <rdma/rdma_cm.h>
35
Sowmini Varadhan0cb43962016-06-13 09:44:26 -070036#include "rds_single_path.h"
Andy Grover55b7ed02009-02-24 15:30:37 +000037#include "rdma_transport.h"
santosh.shilimkar@oracle.comae053682015-08-22 15:45:35 -070038#include "ib.h"
Andy Grover55b7ed02009-02-24 15:30:37 +000039
Ka-Cheong Poon1e2b44e2018-07-23 20:51:22 -070040/* Global IPv4 and IPv6 RDS RDMA listener cm_id */
Andy Grover11bc9422009-04-09 14:09:37 +000041static struct rdma_cm_id *rds_rdma_listen_id;
Ka-Cheong Poone65d4d92018-07-30 22:48:42 -070042#if IS_ENABLED(CONFIG_IPV6)
Ka-Cheong Poon1e2b44e2018-07-23 20:51:22 -070043static struct rdma_cm_id *rds6_rdma_listen_id;
Ka-Cheong Poone65d4d92018-07-30 22:48:42 -070044#endif
Andy Grover55b7ed02009-02-24 15:30:37 +000045
Zhu Yanjune0e6d062019-08-23 21:04:16 -040046/* Per IB specification 7.7.3, service level is a 4-bit field. */
47#define TOS_TO_SL(tos) ((tos) & 0xF)
48
Ka-Cheong Pooneee2fa62018-07-23 20:51:21 -070049static int rds_rdma_cm_event_handler_cmn(struct rdma_cm_id *cm_id,
50 struct rdma_cm_event *event,
51 bool isv6)
Andy Grover55b7ed02009-02-24 15:30:37 +000052{
53 /* this can be null in the listening path */
54 struct rds_connection *conn = cm_id->context;
55 struct rds_transport *trans;
56 int ret = 0;
Santosh Shilimkard021fab2018-10-23 23:09:00 -040057 int *err;
58 u8 len;
Andy Grover55b7ed02009-02-24 15:30:37 +000059
Zach Brown59f740a2010-08-03 13:52:47 -070060 rdsdebug("conn %p id %p handling event %u (%s)\n", conn, cm_id,
Sagi Grimberg3c88f3d2015-05-18 13:40:33 +030061 event->event, rdma_event_msg(event->event));
Andy Grover55b7ed02009-02-24 15:30:37 +000062
santosh.shilimkar@oracle.comdcdede02016-03-01 15:20:42 -080063 if (cm_id->device->node_type == RDMA_NODE_IB_CA)
Andy Grover55b7ed02009-02-24 15:30:37 +000064 trans = &rds_ib_transport;
65
66 /* Prevent shutdown from tearing down the connection
67 * while we're executing. */
68 if (conn) {
69 mutex_lock(&conn->c_cm_lock);
70
71 /* If the connection is being shut down, bail out
72 * right away. We return 0 so cm_id doesn't get
73 * destroyed prematurely */
74 if (rds_conn_state(conn) == RDS_CONN_DISCONNECTING) {
75 /* Reject incoming connections while we're tearing
76 * down an existing one. */
77 if (event->event == RDMA_CM_EVENT_CONNECT_REQUEST)
78 ret = 1;
79 goto out;
80 }
81 }
82
83 switch (event->event) {
84 case RDMA_CM_EVENT_CONNECT_REQUEST:
Ka-Cheong Pooneee2fa62018-07-23 20:51:21 -070085 ret = trans->cm_handle_connect(cm_id, event, isv6);
Andy Grover55b7ed02009-02-24 15:30:37 +000086 break;
87
88 case RDMA_CM_EVENT_ADDR_RESOLVED:
Santosh Shilimkarfd261ce2018-10-13 22:13:23 +080089 rdma_set_service_type(cm_id, conn->c_tos);
HÃ¥kon Bugge5aa54bd282021-03-31 20:43:14 +020090 rdma_set_min_rnr_timer(cm_id, IB_RNR_TIMER_000_32);
Andy Grover55b7ed02009-02-24 15:30:37 +000091 /* XXX do we need to clean up if this fails? */
92 ret = rdma_resolve_route(cm_id,
93 RDS_RDMA_RESOLVE_TIMEOUT_MS);
94 break;
95
96 case RDMA_CM_EVENT_ROUTE_RESOLVED:
santosh.shilimkar@oracle.comae053682015-08-22 15:45:35 -070097 /* Connection could have been dropped so make sure the
98 * cm_id is valid before proceeding
99 */
100 if (conn) {
101 struct rds_ib_connection *ibic;
102
103 ibic = conn->c_transport_data;
Zhu Yanjune0e6d062019-08-23 21:04:16 -0400104 if (ibic && ibic->i_cm_id == cm_id) {
105 cm_id->route.path_rec[0].sl =
106 TOS_TO_SL(conn->c_tos);
Ka-Cheong Pooneee2fa62018-07-23 20:51:21 -0700107 ret = trans->cm_initiate_connect(cm_id, isv6);
Zhu Yanjune0e6d062019-08-23 21:04:16 -0400108 } else {
santosh.shilimkar@oracle.comae053682015-08-22 15:45:35 -0700109 rds_conn_drop(conn);
Zhu Yanjune0e6d062019-08-23 21:04:16 -0400110 }
santosh.shilimkar@oracle.comae053682015-08-22 15:45:35 -0700111 }
Andy Grover55b7ed02009-02-24 15:30:37 +0000112 break;
113
114 case RDMA_CM_EVENT_ESTABLISHED:
Jia-Ju Baic7ba50f2019-07-26 22:17:05 +0800115 if (conn)
116 trans->cm_connect_complete(conn, event);
Andy Grover55b7ed02009-02-24 15:30:37 +0000117 break;
118
Steve Wise39384f02016-10-26 12:36:48 -0700119 case RDMA_CM_EVENT_REJECTED:
Santosh Shilimkard021fab2018-10-23 23:09:00 -0400120 if (!conn)
121 break;
122 err = (int *)rdma_consumer_reject_data(cm_id, event, &len);
Gerd Rausch8c6166c2019-06-27 09:21:44 -0700123 if (!err ||
124 (err && len >= sizeof(*err) &&
125 ((*err) <= RDS_RDMA_REJ_INCOMPAT))) {
Santosh Shilimkard021fab2018-10-23 23:09:00 -0400126 pr_warn("RDS/RDMA: conn <%pI6c, %pI6c> rejected, dropping connection\n",
127 &conn->c_laddr, &conn->c_faddr);
Santosh Shilimkardc205a82019-06-28 15:38:58 -0700128
129 if (!conn->c_tos)
130 conn->c_proposed_version = RDS_PROTOCOL_COMPAT_VERSION;
131
Santosh Shilimkard021fab2018-10-23 23:09:00 -0400132 rds_conn_drop(conn);
133 }
Steve Wise39384f02016-10-26 12:36:48 -0700134 rdsdebug("Connection rejected: %s\n",
135 rdma_reject_msg(cm_id, event->status));
Santosh Shilimkard021fab2018-10-23 23:09:00 -0400136 break;
Andy Grover55b7ed02009-02-24 15:30:37 +0000137 case RDMA_CM_EVENT_ADDR_ERROR:
138 case RDMA_CM_EVENT_ROUTE_ERROR:
139 case RDMA_CM_EVENT_CONNECT_ERROR:
140 case RDMA_CM_EVENT_UNREACHABLE:
Andy Grover55b7ed02009-02-24 15:30:37 +0000141 case RDMA_CM_EVENT_DEVICE_REMOVAL:
142 case RDMA_CM_EVENT_ADDR_CHANGE:
143 if (conn)
144 rds_conn_drop(conn);
145 break;
146
147 case RDMA_CM_EVENT_DISCONNECTED:
Jia-Ju Baic7ba50f2019-07-26 22:17:05 +0800148 if (!conn)
149 break;
Andy Grover97069782010-03-11 13:50:02 +0000150 rdsdebug("DISCONNECT event - dropping connection "
Ka-Cheong Pooneee2fa62018-07-23 20:51:21 -0700151 "%pI6c->%pI6c\n", &conn->c_laddr,
Andy Grover55b7ed02009-02-24 15:30:37 +0000152 &conn->c_faddr);
153 rds_conn_drop(conn);
154 break;
155
santosh.shilimkar@oracle.com37ea4012016-03-01 15:20:50 -0800156 case RDMA_CM_EVENT_TIMEWAIT_EXIT:
157 if (conn) {
Ka-Cheong Pooneee2fa62018-07-23 20:51:21 -0700158 pr_info("RDS: RDMA_CM_EVENT_TIMEWAIT_EXIT event: dropping connection %pI6c->%pI6c\n",
santosh.shilimkar@oracle.com37ea4012016-03-01 15:20:50 -0800159 &conn->c_laddr, &conn->c_faddr);
160 rds_conn_drop(conn);
161 }
162 break;
163
Andy Grover55b7ed02009-02-24 15:30:37 +0000164 default:
165 /* things like device disconnect? */
Zach Brown59f740a2010-08-03 13:52:47 -0700166 printk(KERN_ERR "RDS: unknown event %u (%s)!\n",
Sagi Grimberg3c88f3d2015-05-18 13:40:33 +0300167 event->event, rdma_event_msg(event->event));
Andy Grover55b7ed02009-02-24 15:30:37 +0000168 break;
169 }
170
171out:
172 if (conn)
173 mutex_unlock(&conn->c_cm_lock);
174
Zach Brown59f740a2010-08-03 13:52:47 -0700175 rdsdebug("id %p event %u (%s) handling ret %d\n", cm_id, event->event,
Sagi Grimberg3c88f3d2015-05-18 13:40:33 +0300176 rdma_event_msg(event->event), ret);
Andy Grover55b7ed02009-02-24 15:30:37 +0000177
178 return ret;
179}
180
Ka-Cheong Pooneee2fa62018-07-23 20:51:21 -0700181int rds_rdma_cm_event_handler(struct rdma_cm_id *cm_id,
182 struct rdma_cm_event *event)
Andy Grover55b7ed02009-02-24 15:30:37 +0000183{
Ka-Cheong Pooneee2fa62018-07-23 20:51:21 -0700184 return rds_rdma_cm_event_handler_cmn(cm_id, event, false);
185}
186
Ka-Cheong Poone65d4d92018-07-30 22:48:42 -0700187#if IS_ENABLED(CONFIG_IPV6)
Ka-Cheong Poon1e2b44e2018-07-23 20:51:22 -0700188int rds6_rdma_cm_event_handler(struct rdma_cm_id *cm_id,
189 struct rdma_cm_event *event)
190{
191 return rds_rdma_cm_event_handler_cmn(cm_id, event, true);
192}
Ka-Cheong Poone65d4d92018-07-30 22:48:42 -0700193#endif
Ka-Cheong Poon1e2b44e2018-07-23 20:51:22 -0700194
Ka-Cheong Pooneee2fa62018-07-23 20:51:21 -0700195static int rds_rdma_listen_init_common(rdma_cm_event_handler handler,
196 struct sockaddr *sa,
197 struct rdma_cm_id **ret_cm_id)
198{
Andy Grover55b7ed02009-02-24 15:30:37 +0000199 struct rdma_cm_id *cm_id;
200 int ret;
201
Ka-Cheong Pooneee2fa62018-07-23 20:51:21 -0700202 cm_id = rdma_create_id(&init_net, handler, NULL,
Guy Shapirofa201052015-10-22 15:20:10 +0300203 RDMA_PS_TCP, IB_QPT_RC);
Andy Grover55b7ed02009-02-24 15:30:37 +0000204 if (IS_ERR(cm_id)) {
205 ret = PTR_ERR(cm_id);
Andy Grover92c330b2009-07-17 13:13:26 +0000206 printk(KERN_ERR "RDS/RDMA: failed to setup listener, "
Andy Grover55b7ed02009-02-24 15:30:37 +0000207 "rdma_create_id() returned %d\n", ret);
Dan Carpenter24acc682010-04-21 23:55:27 +0000208 return ret;
Andy Grover55b7ed02009-02-24 15:30:37 +0000209 }
210
Andy Grover55b7ed02009-02-24 15:30:37 +0000211 /*
212 * XXX I bet this binds the cm_id to a device. If we want to support
213 * fail-over we'll have to take this into consideration.
214 */
Ka-Cheong Pooneee2fa62018-07-23 20:51:21 -0700215 ret = rdma_bind_addr(cm_id, sa);
Andy Grover55b7ed02009-02-24 15:30:37 +0000216 if (ret) {
Andy Grover92c330b2009-07-17 13:13:26 +0000217 printk(KERN_ERR "RDS/RDMA: failed to setup listener, "
Andy Grover55b7ed02009-02-24 15:30:37 +0000218 "rdma_bind_addr() returned %d\n", ret);
219 goto out;
220 }
221
222 ret = rdma_listen(cm_id, 128);
223 if (ret) {
Andy Grover92c330b2009-07-17 13:13:26 +0000224 printk(KERN_ERR "RDS/RDMA: failed to setup listener, "
Andy Grover55b7ed02009-02-24 15:30:37 +0000225 "rdma_listen() returned %d\n", ret);
226 goto out;
227 }
228
229 rdsdebug("cm %p listening on port %u\n", cm_id, RDS_PORT);
230
Ka-Cheong Pooneee2fa62018-07-23 20:51:21 -0700231 *ret_cm_id = cm_id;
Andy Grover55b7ed02009-02-24 15:30:37 +0000232 cm_id = NULL;
233out:
234 if (cm_id)
235 rdma_destroy_id(cm_id);
236 return ret;
237}
238
Ka-Cheong Pooneee2fa62018-07-23 20:51:21 -0700239/* Initialize the RDS RDMA listeners. We create two listeners for
240 * compatibility reason. The one on RDS_PORT is used for IPv4
241 * requests only. The one on RDS_CM_PORT is used for IPv6 requests
242 * only. So only IPv6 enabled RDS module will communicate using this
243 * port.
244 */
245static int rds_rdma_listen_init(void)
246{
247 int ret;
Ka-Cheong Poone65d4d92018-07-30 22:48:42 -0700248#if IS_ENABLED(CONFIG_IPV6)
Ka-Cheong Poon1e2b44e2018-07-23 20:51:22 -0700249 struct sockaddr_in6 sin6;
Ka-Cheong Poone65d4d92018-07-30 22:48:42 -0700250#endif
Ka-Cheong Pooneee2fa62018-07-23 20:51:21 -0700251 struct sockaddr_in sin;
252
253 sin.sin_family = PF_INET;
254 sin.sin_addr.s_addr = htonl(INADDR_ANY);
255 sin.sin_port = htons(RDS_PORT);
256 ret = rds_rdma_listen_init_common(rds_rdma_cm_event_handler,
257 (struct sockaddr *)&sin,
258 &rds_rdma_listen_id);
Ka-Cheong Poon1e2b44e2018-07-23 20:51:22 -0700259 if (ret != 0)
260 return ret;
261
Ka-Cheong Poone65d4d92018-07-30 22:48:42 -0700262#if IS_ENABLED(CONFIG_IPV6)
Ka-Cheong Poon1e2b44e2018-07-23 20:51:22 -0700263 sin6.sin6_family = PF_INET6;
264 sin6.sin6_addr = in6addr_any;
265 sin6.sin6_port = htons(RDS_CM_PORT);
266 sin6.sin6_scope_id = 0;
267 sin6.sin6_flowinfo = 0;
268 ret = rds_rdma_listen_init_common(rds6_rdma_cm_event_handler,
269 (struct sockaddr *)&sin6,
270 &rds6_rdma_listen_id);
271 /* Keep going even when IPv6 is not enabled in the system. */
272 if (ret != 0)
273 rdsdebug("Cannot set up IPv6 RDMA listener\n");
Ka-Cheong Poone65d4d92018-07-30 22:48:42 -0700274#endif
Ka-Cheong Poon1e2b44e2018-07-23 20:51:22 -0700275 return 0;
Ka-Cheong Pooneee2fa62018-07-23 20:51:21 -0700276}
277
Andy Grover55b7ed02009-02-24 15:30:37 +0000278static void rds_rdma_listen_stop(void)
279{
Andy Grover11bc9422009-04-09 14:09:37 +0000280 if (rds_rdma_listen_id) {
281 rdsdebug("cm %p\n", rds_rdma_listen_id);
282 rdma_destroy_id(rds_rdma_listen_id);
283 rds_rdma_listen_id = NULL;
Andy Grover55b7ed02009-02-24 15:30:37 +0000284 }
Ka-Cheong Poone65d4d92018-07-30 22:48:42 -0700285#if IS_ENABLED(CONFIG_IPV6)
Ka-Cheong Poon1e2b44e2018-07-23 20:51:22 -0700286 if (rds6_rdma_listen_id) {
287 rdsdebug("cm %p\n", rds6_rdma_listen_id);
288 rdma_destroy_id(rds6_rdma_listen_id);
289 rds6_rdma_listen_id = NULL;
290 }
Ka-Cheong Poone65d4d92018-07-30 22:48:42 -0700291#endif
Andy Grover55b7ed02009-02-24 15:30:37 +0000292}
293
stephen hemmingerff51bf82010-10-19 08:08:33 +0000294static int rds_rdma_init(void)
Andy Grover55b7ed02009-02-24 15:30:37 +0000295{
296 int ret;
297
Qing Huang8d5d8a52016-07-04 16:29:13 -0700298 ret = rds_ib_init();
Andy Grover55b7ed02009-02-24 15:30:37 +0000299 if (ret)
300 goto out;
301
Qing Huang8d5d8a52016-07-04 16:29:13 -0700302 ret = rds_rdma_listen_init();
Andy Grover55b7ed02009-02-24 15:30:37 +0000303 if (ret)
Qing Huang8d5d8a52016-07-04 16:29:13 -0700304 rds_ib_exit();
Andy Grover55b7ed02009-02-24 15:30:37 +0000305out:
306 return ret;
307}
Andy Grover40d86602009-08-21 12:28:33 +0000308module_init(rds_rdma_init);
Andy Grover55b7ed02009-02-24 15:30:37 +0000309
stephen hemmingerff51bf82010-10-19 08:08:33 +0000310static void rds_rdma_exit(void)
Andy Grover55b7ed02009-02-24 15:30:37 +0000311{
312 /* stop listening first to ensure no new connections are attempted */
313 rds_rdma_listen_stop();
314 rds_ib_exit();
Andy Grover55b7ed02009-02-24 15:30:37 +0000315}
Andy Grover40d86602009-08-21 12:28:33 +0000316module_exit(rds_rdma_exit);
317
318MODULE_AUTHOR("Oracle Corporation <rds-devel@oss.oracle.com>");
santosh.shilimkar@oracle.comdcdede02016-03-01 15:20:42 -0800319MODULE_DESCRIPTION("RDS: IB transport");
Andy Grover40d86602009-08-21 12:28:33 +0000320MODULE_LICENSE("Dual BSD/GPL");