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_rdma_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		ret = rdma_resolve_route(cm_id,
79					 RDS_RDMA_RESOLVE_TIMEOUT_MS);
80		break;
81
82	case RDMA_CM_EVENT_ROUTE_RESOLVED:
83		ret = trans->cm_initiate_connect(cm_id);
84		break;
85
86	case RDMA_CM_EVENT_ESTABLISHED:
87		trans->cm_connect_complete(conn, event);
88		break;
89
90	case RDMA_CM_EVENT_ADDR_ERROR:
91	case RDMA_CM_EVENT_ROUTE_ERROR:
92	case RDMA_CM_EVENT_CONNECT_ERROR:
93	case RDMA_CM_EVENT_UNREACHABLE:
94	case RDMA_CM_EVENT_REJECTED:
95	case RDMA_CM_EVENT_DEVICE_REMOVAL:
96	case RDMA_CM_EVENT_ADDR_CHANGE:
97		if (conn)
98			rds_conn_drop(conn);
99		break;
100
101	case RDMA_CM_EVENT_DISCONNECTED:
102		rdsdebug("DISCONNECT event - dropping connection "
103			"%pI4->%pI4\n", &conn->c_laddr,
104			 &conn->c_faddr);
105		rds_conn_drop(conn);
106		break;
107
108	default:
109		/* things like device disconnect? */
110		printk(KERN_ERR "RDS: unknown event %u!\n", event->event);
111		break;
112	}
113
114out:
115	if (conn)
116		mutex_unlock(&conn->c_cm_lock);
117
118	rdsdebug("id %p event %u handling ret %d\n", cm_id, event->event, ret);
119
120	return ret;
121}
122
123static int __init rds_rdma_listen_init(void)
124{
125	struct sockaddr_in sin;
126	struct rdma_cm_id *cm_id;
127	int ret;
128
129	cm_id = rdma_create_id(rds_rdma_cm_event_handler, NULL, RDMA_PS_TCP);
130	if (IS_ERR(cm_id)) {
131		ret = PTR_ERR(cm_id);
132		printk(KERN_ERR "RDS/RDMA: failed to setup listener, "
133		       "rdma_create_id() returned %d\n", ret);
134		return ret;
135	}
136
137	sin.sin_family = AF_INET,
138	sin.sin_addr.s_addr = (__force u32)htonl(INADDR_ANY);
139	sin.sin_port = (__force u16)htons(RDS_PORT);
140
141	ret = rdma_bind_addr(cm_id, (struct sockaddr *)&sin);
142	if (ret) {
143		printk(KERN_ERR "RDS/RDMA: failed to setup listener, "
144		       "rdma_bind_addr() returned %d\n", ret);
145		goto out;
146	}
147
148	ret = rdma_listen(cm_id, 128);
149	if (ret) {
150		printk(KERN_ERR "RDS/RDMA: failed to setup listener, "
151		       "rdma_listen() returned %d\n", ret);
152		goto out;
153	}
154
155	rdsdebug("cm %p listening on port %u\n", cm_id, RDS_PORT);
156
157	rds_rdma_listen_id = cm_id;
158	cm_id = NULL;
159out:
160	if (cm_id)
161		rdma_destroy_id(cm_id);
162	return ret;
163}
164
165static void rds_rdma_listen_stop(void)
166{
167	if (rds_rdma_listen_id) {
168		rdsdebug("cm %p\n", rds_rdma_listen_id);
169		rdma_destroy_id(rds_rdma_listen_id);
170		rds_rdma_listen_id = NULL;
171	}
172}
173
174int __init rds_rdma_init(void)
175{
176	int ret;
177
178	ret = rds_rdma_listen_init();
179	if (ret)
180		goto out;
181
182	ret = rds_iw_init();
183	if (ret)
184		goto err_iw_init;
185
186	ret = rds_ib_init();
187	if (ret)
188		goto err_ib_init;
189
190	goto out;
191
192err_ib_init:
193	rds_iw_exit();
194err_iw_init:
195	rds_rdma_listen_stop();
196out:
197	return ret;
198}
199module_init(rds_rdma_init);
200
201void rds_rdma_exit(void)
202{
203	/* stop listening first to ensure no new connections are attempted */
204	rds_rdma_listen_stop();
205	rds_ib_exit();
206	rds_iw_exit();
207}
208module_exit(rds_rdma_exit);
209
210MODULE_AUTHOR("Oracle Corporation <rds-devel@oss.oracle.com>");
211MODULE_DESCRIPTION("RDS: IB/iWARP transport");
212MODULE_LICENSE("Dual BSD/GPL");
213