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#include <linux/module.h>
34#include <rdma/rdma_cm.h>
35
36#include "rdma_transport.h"
37
38static struct rdma_cm_id *rds_rdma_listen_id;
39
40static char *rds_cm_event_strings[] = {
41#define RDS_CM_EVENT_STRING(foo) \
42 [RDMA_CM_EVENT_##foo] = __stringify(RDMA_CM_EVENT_##foo)
43 RDS_CM_EVENT_STRING(ADDR_RESOLVED),
44 RDS_CM_EVENT_STRING(ADDR_ERROR),
45 RDS_CM_EVENT_STRING(ROUTE_RESOLVED),
46 RDS_CM_EVENT_STRING(ROUTE_ERROR),
47 RDS_CM_EVENT_STRING(CONNECT_REQUEST),
48 RDS_CM_EVENT_STRING(CONNECT_RESPONSE),
49 RDS_CM_EVENT_STRING(CONNECT_ERROR),
50 RDS_CM_EVENT_STRING(UNREACHABLE),
51 RDS_CM_EVENT_STRING(REJECTED),
52 RDS_CM_EVENT_STRING(ESTABLISHED),
53 RDS_CM_EVENT_STRING(DISCONNECTED),
54 RDS_CM_EVENT_STRING(DEVICE_REMOVAL),
55 RDS_CM_EVENT_STRING(MULTICAST_JOIN),
56 RDS_CM_EVENT_STRING(MULTICAST_ERROR),
57 RDS_CM_EVENT_STRING(ADDR_CHANGE),
58 RDS_CM_EVENT_STRING(TIMEWAIT_EXIT),
59#undef RDS_CM_EVENT_STRING
60};
61
62static char *rds_cm_event_str(enum rdma_cm_event_type type)
63{
64 return rds_str_array(rds_cm_event_strings,
65 ARRAY_SIZE(rds_cm_event_strings), type);
66};
67
68int rds_rdma_cm_event_handler(struct rdma_cm_id *cm_id,
69 struct rdma_cm_event *event)
70{
71
72 struct rds_connection *conn = cm_id->context;
73 struct rds_transport *trans;
74 int ret = 0;
75
76 rdsdebug("conn %p id %p handling event %u (%s)\n", conn, cm_id,
77 event->event, rds_cm_event_str(event->event));
78
79 if (cm_id->device->node_type == RDMA_NODE_RNIC)
80 trans = &rds_iw_transport;
81 else
82 trans = &rds_ib_transport;
83
84
85
86 if (conn) {
87 mutex_lock(&conn->c_cm_lock);
88
89
90
91
92 if (rds_conn_state(conn) == RDS_CONN_DISCONNECTING) {
93
94
95 if (event->event == RDMA_CM_EVENT_CONNECT_REQUEST)
96 ret = 1;
97 goto out;
98 }
99 }
100
101 switch (event->event) {
102 case RDMA_CM_EVENT_CONNECT_REQUEST:
103 ret = trans->cm_handle_connect(cm_id, event);
104 break;
105
106 case RDMA_CM_EVENT_ADDR_RESOLVED:
107
108 ret = rdma_resolve_route(cm_id,
109 RDS_RDMA_RESOLVE_TIMEOUT_MS);
110 break;
111
112 case RDMA_CM_EVENT_ROUTE_RESOLVED:
113
114 ret = trans->cm_initiate_connect(cm_id);
115 break;
116
117 case RDMA_CM_EVENT_ESTABLISHED:
118 trans->cm_connect_complete(conn, event);
119 break;
120
121 case RDMA_CM_EVENT_ADDR_ERROR:
122 case RDMA_CM_EVENT_ROUTE_ERROR:
123 case RDMA_CM_EVENT_CONNECT_ERROR:
124 case RDMA_CM_EVENT_UNREACHABLE:
125 case RDMA_CM_EVENT_REJECTED:
126 case RDMA_CM_EVENT_DEVICE_REMOVAL:
127 case RDMA_CM_EVENT_ADDR_CHANGE:
128 if (conn)
129 rds_conn_drop(conn);
130 break;
131
132 case RDMA_CM_EVENT_DISCONNECTED:
133 rdsdebug("DISCONNECT event - dropping connection "
134 "%pI4->%pI4\n", &conn->c_laddr,
135 &conn->c_faddr);
136 rds_conn_drop(conn);
137 break;
138
139 default:
140
141 printk(KERN_ERR "RDS: unknown event %u (%s)!\n",
142 event->event, rds_cm_event_str(event->event));
143 break;
144 }
145
146out:
147 if (conn)
148 mutex_unlock(&conn->c_cm_lock);
149
150 rdsdebug("id %p event %u (%s) handling ret %d\n", cm_id, event->event,
151 rds_cm_event_str(event->event), ret);
152
153 return ret;
154}
155
156static int rds_rdma_listen_init(void)
157{
158 struct sockaddr_in sin;
159 struct rdma_cm_id *cm_id;
160 int ret;
161
162 cm_id = rdma_create_id(rds_rdma_cm_event_handler, NULL, RDMA_PS_TCP,
163 IB_QPT_RC);
164 if (IS_ERR(cm_id)) {
165 ret = PTR_ERR(cm_id);
166 printk(KERN_ERR "RDS/RDMA: failed to setup listener, "
167 "rdma_create_id() returned %d\n", ret);
168 return ret;
169 }
170
171 sin.sin_family = AF_INET,
172 sin.sin_addr.s_addr = (__force u32)htonl(INADDR_ANY);
173 sin.sin_port = (__force u16)htons(RDS_PORT);
174
175
176
177
178
179 ret = rdma_bind_addr(cm_id, (struct sockaddr *)&sin);
180 if (ret) {
181 printk(KERN_ERR "RDS/RDMA: failed to setup listener, "
182 "rdma_bind_addr() returned %d\n", ret);
183 goto out;
184 }
185
186 ret = rdma_listen(cm_id, 128);
187 if (ret) {
188 printk(KERN_ERR "RDS/RDMA: failed to setup listener, "
189 "rdma_listen() returned %d\n", ret);
190 goto out;
191 }
192
193 rdsdebug("cm %p listening on port %u\n", cm_id, RDS_PORT);
194
195 rds_rdma_listen_id = cm_id;
196 cm_id = NULL;
197out:
198 if (cm_id)
199 rdma_destroy_id(cm_id);
200 return ret;
201}
202
203static void rds_rdma_listen_stop(void)
204{
205 if (rds_rdma_listen_id) {
206 rdsdebug("cm %p\n", rds_rdma_listen_id);
207 rdma_destroy_id(rds_rdma_listen_id);
208 rds_rdma_listen_id = NULL;
209 }
210}
211
212static int rds_rdma_init(void)
213{
214 int ret;
215
216 ret = rds_rdma_listen_init();
217 if (ret)
218 goto out;
219
220 ret = rds_iw_init();
221 if (ret)
222 goto err_iw_init;
223
224 ret = rds_ib_init();
225 if (ret)
226 goto err_ib_init;
227
228 goto out;
229
230err_ib_init:
231 rds_iw_exit();
232err_iw_init:
233 rds_rdma_listen_stop();
234out:
235 return ret;
236}
237module_init(rds_rdma_init);
238
239static void rds_rdma_exit(void)
240{
241
242 rds_rdma_listen_stop();
243 rds_ib_exit();
244 rds_iw_exit();
245}
246module_exit(rds_rdma_exit);
247
248MODULE_AUTHOR("Oracle Corporation <rds-devel@oss.oracle.com>");
249MODULE_DESCRIPTION("RDS: IB/iWARP transport");
250MODULE_LICENSE("Dual BSD/GPL");
251
252