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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;
47 rdsdebug("conn %p id %p handling event %u\n", conn, cm_id,
50 if (cm_id->device->node_type == RDMA_NODE_RNIC)
51 trans = &rds_iw_transport;
53 trans = &rds_ib_transport;
55 /* Prevent shutdown from tearing down the connection
56 * while we're executing. */
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)
72 switch (event->event) {
73 case RDMA_CM_EVENT_CONNECT_REQUEST:
74 ret = trans->cm_handle_connect(cm_id, event);
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);
83 case RDMA_CM_EVENT_ROUTE_RESOLVED:
84 /* XXX worry about racing with listen acceptance */
85 ret = trans->cm_initiate_connect(cm_id);
88 case RDMA_CM_EVENT_ESTABLISHED:
89 trans->cm_connect_complete(conn, event);
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:
103 case RDMA_CM_EVENT_DISCONNECTED:
104 printk(KERN_WARNING "RDS/IW: DISCONNECT event - dropping connection "
105 "%pI4->%pI4\n", &conn->c_laddr,
111 /* things like device disconnect? */
112 printk(KERN_ERR "unknown event %u\n", event->event);
119 mutex_unlock(&conn->c_cm_lock);
121 rdsdebug("id %p event %u handling ret %d\n", cm_id, event->event, ret);
126 static int __init rds_rdma_listen_init(void)
128 struct sockaddr_in sin;
129 struct rdma_cm_id *cm_id;
132 cm_id = rdma_create_id(rds_rdma_cm_event_handler, NULL, RDMA_PS_TCP);
134 ret = PTR_ERR(cm_id);
135 printk(KERN_ERR "RDS/IW: failed to setup listener, "
136 "rdma_create_id() returned %d\n", ret);
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);
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);
150 printk(KERN_ERR "RDS/IW: failed to setup listener, "
151 "rdma_bind_addr() returned %d\n", ret);
155 ret = rdma_listen(cm_id, 128);
157 printk(KERN_ERR "RDS/IW: failed to setup listener, "
158 "rdma_listen() returned %d\n", ret);
162 rdsdebug("cm %p listening on port %u\n", cm_id, RDS_PORT);
164 rds_rdma_listen_id = cm_id;
168 rdma_destroy_id(cm_id);
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)
185 ret = rds_rdma_listen_init();
202 rds_rdma_listen_stop();
207 void rds_rdma_exit(void)
209 /* stop listening first to ensure no new connections are attempted */
210 rds_rdma_listen_stop();