USB: serial: add special case for processing of empty read urbs
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / net / rds / rdma_transport.c
blob7b155081b4dc59ba8a8565396ff01e78cb7cde21
1 /*
2 * Copyright (c) 2009 Oracle. All rights reserved.
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:
10 * Redistribution and use in source and binary forms, with or
11 * without modification, are permitted provided that the following
12 * conditions are met:
14 * - Redistributions of source code must retain the above
15 * copyright notice, this list of conditions and the following
16 * disclaimer.
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.
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.
33 #include <rdma/rdma_cm.h>
35 #include "rdma_transport.h"
37 static struct rdma_cm_id *rds_rdma_listen_id;
39 int rds_rdma_cm_event_handler(struct rdma_cm_id *cm_id,
40 struct rdma_cm_event *event)
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;
47 rdsdebug("conn %p id %p handling event %u\n", conn, cm_id,
48 event->event);
50 if (cm_id->device->node_type == RDMA_NODE_RNIC)
51 trans = &rds_iw_transport;
52 else
53 trans = &rds_ib_transport;
55 /* Prevent shutdown from tearing down the connection
56 * while we're executing. */
57 if (conn) {
58 mutex_lock(&conn->c_cm_lock);
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;
72 switch (event->event) {
73 case RDMA_CM_EVENT_CONNECT_REQUEST:
74 ret = trans->cm_handle_connect(cm_id, event);
75 break;
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;
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;
88 case RDMA_CM_EVENT_ESTABLISHED:
89 trans->cm_connect_complete(conn, event);
90 break;
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;
103 case RDMA_CM_EVENT_DISCONNECTED:
104 printk(KERN_WARNING "RDS/RDMA: DISCONNECT event - dropping connection "
105 "%pI4->%pI4\n", &conn->c_laddr,
106 &conn->c_faddr);
107 rds_conn_drop(conn);
108 break;
110 default:
111 /* things like device disconnect? */
112 printk(KERN_ERR "unknown event %u\n", event->event);
113 BUG();
114 break;
117 out:
118 if (conn)
119 mutex_unlock(&conn->c_cm_lock);
121 rdsdebug("id %p event %u handling ret %d\n", cm_id, event->event, ret);
123 return ret;
126 static int __init rds_rdma_listen_init(void)
128 struct sockaddr_in sin;
129 struct rdma_cm_id *cm_id;
130 int ret;
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/RDMA: failed to setup listener, "
136 "rdma_create_id() returned %d\n", ret);
137 return ret;
140 sin.sin_family = AF_INET,
141 sin.sin_addr.s_addr = (__force u32)htonl(INADDR_ANY);
142 sin.sin_port = (__force u16)htons(RDS_PORT);
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.
148 ret = rdma_bind_addr(cm_id, (struct sockaddr *)&sin);
149 if (ret) {
150 printk(KERN_ERR "RDS/RDMA: failed to setup listener, "
151 "rdma_bind_addr() returned %d\n", ret);
152 goto out;
155 ret = rdma_listen(cm_id, 128);
156 if (ret) {
157 printk(KERN_ERR "RDS/RDMA: failed to setup listener, "
158 "rdma_listen() returned %d\n", ret);
159 goto out;
162 rdsdebug("cm %p listening on port %u\n", cm_id, RDS_PORT);
164 rds_rdma_listen_id = cm_id;
165 cm_id = NULL;
166 out:
167 if (cm_id)
168 rdma_destroy_id(cm_id);
169 return ret;
172 static void rds_rdma_listen_stop(void)
174 if (rds_rdma_listen_id) {
175 rdsdebug("cm %p\n", rds_rdma_listen_id);
176 rdma_destroy_id(rds_rdma_listen_id);
177 rds_rdma_listen_id = NULL;
181 int __init rds_rdma_init(void)
183 int ret;
185 ret = rds_rdma_listen_init();
186 if (ret)
187 goto out;
189 ret = rds_iw_init();
190 if (ret)
191 goto err_iw_init;
193 ret = rds_ib_init();
194 if (ret)
195 goto err_ib_init;
197 goto out;
199 err_ib_init:
200 rds_iw_exit();
201 err_iw_init:
202 rds_rdma_listen_stop();
203 out:
204 return ret;
206 module_init(rds_rdma_init);
208 void rds_rdma_exit(void)
210 /* stop listening first to ensure no new connections are attempted */
211 rds_rdma_listen_stop();
212 rds_ib_exit();
213 rds_iw_exit();
215 module_exit(rds_rdma_exit);
217 MODULE_AUTHOR("Oracle Corporation <rds-devel@oss.oracle.com>");
218 MODULE_DESCRIPTION("RDS: IB/iWARP transport");
219 MODULE_LICENSE("Dual BSD/GPL");