1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
|
/*
* Copyright (c) 2009 Oracle. All rights reserved.
*
* This software is available to you under a choice of one of two
* licenses. You may choose to be licensed under the terms of the GNU
* General Public License (GPL) Version 2, available from the file
* COPYING in the main directory of this source tree, or the
* OpenIB.org BSD license below:
*
* Redistribution and use in source and binary forms, with or
* without modification, are permitted provided that the following
* conditions are met:
*
* - Redistributions of source code must retain the above
* copyright notice, this list of conditions and the following
* disclaimer.
*
* - Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following
* disclaimer in the documentation and/or other materials
* provided with the distribution.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*
*/
#include <rdma/rdma_cm.h>
#include "rdma_transport.h"
static struct rdma_cm_id *rds_rdma_listen_id;
int rds_rdma_cm_event_handler(struct rdma_cm_id *cm_id,
struct rdma_cm_event *event)
{
/* this can be null in the listening path */
struct rds_connection *conn = cm_id->context;
struct rds_transport *trans;
int ret = 0;
rdsdebug("conn %p id %p handling event %u\n", conn, cm_id,
event->event);
if (cm_id->device->node_type == RDMA_NODE_RNIC)
trans = &rds_iw_transport;
else
trans = &rds_ib_transport;
/* Prevent shutdown from tearing down the connection
* while we're executing. */
if (conn) {
mutex_lock(&conn->c_cm_lock);
/* If the connection is being shut down, bail out
* right away. We return 0 so cm_id doesn't get
* destroyed prematurely */
if (rds_conn_state(conn) == RDS_CONN_DISCONNECTING) {
/* Reject incoming connections while we're tearing
* down an existing one. */
if (event->event == RDMA_CM_EVENT_CONNECT_REQUEST)
ret = 1;
goto out;
}
}
switch (event->event) {
case RDMA_CM_EVENT_CONNECT_REQUEST:
ret = trans->cm_handle_connect(cm_id, event);
break;
case RDMA_CM_EVENT_ADDR_RESOLVED:
/* XXX do we need to clean up if this fails? */
ret = rdma_resolve_route(cm_id,
RDS_RDMA_RESOLVE_TIMEOUT_MS);
break;
case RDMA_CM_EVENT_ROUTE_RESOLVED:
/* XXX worry about racing with listen acceptance */
ret = trans->cm_initiate_connect(cm_id);
break;
case RDMA_CM_EVENT_ESTABLISHED:
trans->cm_connect_complete(conn, event);
break;
case RDMA_CM_EVENT_ADDR_ERROR:
case RDMA_CM_EVENT_ROUTE_ERROR:
case RDMA_CM_EVENT_CONNECT_ERROR:
case RDMA_CM_EVENT_UNREACHABLE:
case RDMA_CM_EVENT_REJECTED:
case RDMA_CM_EVENT_DEVICE_REMOVAL:
case RDMA_CM_EVENT_ADDR_CHANGE:
if (conn)
rds_conn_drop(conn);
break;
case RDMA_CM_EVENT_DISCONNECTED:
printk(KERN_WARNING "RDS/RDMA: DISCONNECT event - dropping connection "
"%pI4->%pI4\n", &conn->c_laddr,
&conn->c_faddr);
rds_conn_drop(conn);
break;
default:
/* things like device disconnect? */
printk(KERN_ERR "unknown event %u\n", event->event);
BUG();
break;
}
out:
if (conn)
mutex_unlock(&conn->c_cm_lock);
rdsdebug("id %p event %u handling ret %d\n", cm_id, event->event, ret);
return ret;
}
static int __init rds_rdma_listen_init(void)
{
struct sockaddr_in sin;
struct rdma_cm_id *cm_id;
int ret;
cm_id = rdma_create_id(rds_rdma_cm_event_handler, NULL, RDMA_PS_TCP);
if (IS_ERR(cm_id)) {
ret = PTR_ERR(cm_id);
printk(KERN_ERR "RDS/RDMA: failed to setup listener, "
"rdma_create_id() returned %d\n", ret);
return ret;
}
sin.sin_family = AF_INET,
sin.sin_addr.s_addr = (__force u32)htonl(INADDR_ANY);
sin.sin_port = (__force u16)htons(RDS_PORT);
/*
* XXX I bet this binds the cm_id to a device. If we want to support
* fail-over we'll have to take this into consideration.
*/
ret = rdma_bind_addr(cm_id, (struct sockaddr *)&sin);
if (ret) {
printk(KERN_ERR "RDS/RDMA: failed to setup listener, "
"rdma_bind_addr() returned %d\n", ret);
goto out;
}
ret = rdma_listen(cm_id, 128);
if (ret) {
printk(KERN_ERR "RDS/RDMA: failed to setup listener, "
"rdma_listen() returned %d\n", ret);
goto out;
}
rdsdebug("cm %p listening on port %u\n", cm_id, RDS_PORT);
rds_rdma_listen_id = cm_id;
cm_id = NULL;
out:
if (cm_id)
rdma_destroy_id(cm_id);
return ret;
}
static void rds_rdma_listen_stop(void)
{
if (rds_rdma_listen_id) {
rdsdebug("cm %p\n", rds_rdma_listen_id);
rdma_destroy_id(rds_rdma_listen_id);
rds_rdma_listen_id = NULL;
}
}
int __init rds_rdma_init(void)
{
int ret;
ret = rds_rdma_listen_init();
if (ret)
goto out;
ret = rds_iw_init();
if (ret)
goto err_iw_init;
ret = rds_ib_init();
if (ret)
goto err_ib_init;
goto out;
err_ib_init:
rds_iw_exit();
err_iw_init:
rds_rdma_listen_stop();
out:
return ret;
}
module_init(rds_rdma_init);
void rds_rdma_exit(void)
{
/* stop listening first to ensure no new connections are attempted */
rds_rdma_listen_stop();
rds_ib_exit();
rds_iw_exit();
}
module_exit(rds_rdma_exit);
MODULE_AUTHOR("Oracle Corporation <rds-devel@oss.oracle.com>");
MODULE_DESCRIPTION("RDS: IB/iWARP transport");
MODULE_LICENSE("Dual BSD/GPL");
|
