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-rw-r--r--net/rds/rdma_transport.c214
-rw-r--r--net/rds/rdma_transport.h28
2 files changed, 242 insertions, 0 deletions
diff --git a/net/rds/rdma_transport.c b/net/rds/rdma_transport.c
new file mode 100644
index 000000000000..7b19024f9706
--- /dev/null
+++ b/net/rds/rdma_transport.c
@@ -0,0 +1,214 @@
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 <rdma/rdma_cm.h>
34
35#include "rdma_transport.h"
36
37static struct rdma_cm_id *rds_iw_listen_id;
38
39int rds_rdma_cm_event_handler(struct rdma_cm_id *cm_id,
40 struct rdma_cm_event *event)
41{
42 /* this can be null in the listening path */
43 struct rds_connection *conn = cm_id->context;
44 struct rds_transport *trans;
45 int ret = 0;
46
47 rdsdebug("conn %p id %p handling event %u\n", conn, cm_id,
48 event->event);
49
50 if (cm_id->device->node_type == RDMA_NODE_RNIC)
51 trans = &rds_iw_transport;
52 else
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:
84 /* XXX worry about racing with listen acceptance */
85 ret = trans->cm_initiate_connect(cm_id);
86 break;
87
88 case RDMA_CM_EVENT_ESTABLISHED:
89 trans->cm_connect_complete(conn, event);
90 break;
91
92 case RDMA_CM_EVENT_ADDR_ERROR:
93 case RDMA_CM_EVENT_ROUTE_ERROR:
94 case RDMA_CM_EVENT_CONNECT_ERROR:
95 case RDMA_CM_EVENT_UNREACHABLE:
96 case RDMA_CM_EVENT_REJECTED:
97 case RDMA_CM_EVENT_DEVICE_REMOVAL:
98 case RDMA_CM_EVENT_ADDR_CHANGE:
99 if (conn)
100 rds_conn_drop(conn);
101 break;
102
103 case RDMA_CM_EVENT_DISCONNECTED:
104 printk(KERN_WARNING "RDS/IW: DISCONNECT event - dropping connection "
105 "%pI4->%pI4\n", &conn->c_laddr,
106 &conn->c_faddr);
107 rds_conn_drop(conn);
108 break;
109
110 default:
111 /* things like device disconnect? */
112 printk(KERN_ERR "unknown event %u\n", event->event);
113 BUG();
114 break;
115 }
116
117out:
118 if (conn)
119 mutex_unlock(&conn->c_cm_lock);
120
121 rdsdebug("id %p event %u handling ret %d\n", cm_id, event->event, ret);
122
123 return ret;
124}
125
126static int __init rds_rdma_listen_init(void)
127{
128 struct sockaddr_in sin;
129 struct rdma_cm_id *cm_id;
130 int ret;
131
132 cm_id = rdma_create_id(rds_rdma_cm_event_handler, NULL, RDMA_PS_TCP);
133 if (IS_ERR(cm_id)) {
134 ret = PTR_ERR(cm_id);
135 printk(KERN_ERR "RDS/IW: failed to setup listener, "
136 "rdma_create_id() returned %d\n", ret);
137 goto out;
138 }
139
140 sin.sin_family = PF_INET,
141 sin.sin_addr.s_addr = (__force u32)htonl(INADDR_ANY);
142 sin.sin_port = (__force u16)htons(RDS_PORT);
143
144 /*
145 * XXX I bet this binds the cm_id to a device. If we want to support
146 * fail-over we'll have to take this into consideration.
147 */
148 ret = rdma_bind_addr(cm_id, (struct sockaddr *)&sin);
149 if (ret) {
150 printk(KERN_ERR "RDS/IW: failed to setup listener, "
151 "rdma_bind_addr() returned %d\n", ret);
152 goto out;
153 }
154
155 ret = rdma_listen(cm_id, 128);
156 if (ret) {
157 printk(KERN_ERR "RDS/IW: failed to setup listener, "
158 "rdma_listen() returned %d\n", ret);
159 goto out;
160 }
161
162 rdsdebug("cm %p listening on port %u\n", cm_id, RDS_PORT);
163
164 rds_iw_listen_id = cm_id;
165 cm_id = NULL;
166out:
167 if (cm_id)
168 rdma_destroy_id(cm_id);
169 return ret;
170}
171
172static void rds_rdma_listen_stop(void)
173{
174 if (rds_iw_listen_id) {
175 rdsdebug("cm %p\n", rds_iw_listen_id);
176 rdma_destroy_id(rds_iw_listen_id);
177 rds_iw_listen_id = NULL;
178 }
179}
180
181int __init rds_rdma_init(void)
182{
183 int ret;
184
185 ret = rds_rdma_listen_init();
186 if (ret)
187 goto out;
188
189 ret = rds_iw_init();
190 if (ret)
191 goto err_iw_init;
192
193 ret = rds_ib_init();
194 if (ret)
195 goto err_ib_init;
196
197 goto out;
198
199err_ib_init:
200 rds_iw_exit();
201err_iw_init:
202 rds_rdma_listen_stop();
203out:
204 return ret;
205}
206
207void rds_rdma_exit(void)
208{
209 /* stop listening first to ensure no new connections are attempted */
210 rds_rdma_listen_stop();
211 rds_ib_exit();
212 rds_iw_exit();
213}
214
diff --git a/net/rds/rdma_transport.h b/net/rds/rdma_transport.h
new file mode 100644
index 000000000000..2f2c7d976c21
--- /dev/null
+++ b/net/rds/rdma_transport.h
@@ -0,0 +1,28 @@
1#ifndef _RDMA_TRANSPORT_H
2#define _RDMA_TRANSPORT_H
3
4#include <rdma/ib_verbs.h>
5#include <rdma/rdma_cm.h>
6#include "rds.h"
7
8#define RDS_RDMA_RESOLVE_TIMEOUT_MS 5000
9
10int rds_rdma_conn_connect(struct rds_connection *conn);
11int rds_rdma_cm_event_handler(struct rdma_cm_id *cm_id,
12 struct rdma_cm_event *event);
13
14/* from rdma_transport.c */
15int rds_rdma_init(void);
16void rds_rdma_exit(void);
17
18/* from ib.c */
19extern struct rds_transport rds_ib_transport;
20int rds_ib_init(void);
21void rds_ib_exit(void);
22
23/* from iw.c */
24extern struct rds_transport rds_iw_transport;
25int rds_iw_init(void);
26void rds_iw_exit(void);
27
28#endif
generated by cgit v1.2.2 (git 2.25.0) at 2024-12-14 05:26:21 -0500