--- /dev/null
+/*
+ * 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 <linux/module.h>
+#include <rdma/rdma_cm.h>
+
+#include "rdma_transport.h"
+
+static struct rdma_cm_id *rds_rdma_listen_id;
+
+static char *rds_cm_event_strings[] = {
+#define RDS_CM_EVENT_STRING(foo) \
+ [RDMA_CM_EVENT_##foo] = __stringify(RDMA_CM_EVENT_##foo)
+ RDS_CM_EVENT_STRING(ADDR_RESOLVED),
+ RDS_CM_EVENT_STRING(ADDR_ERROR),
+ RDS_CM_EVENT_STRING(ROUTE_RESOLVED),
+ RDS_CM_EVENT_STRING(ROUTE_ERROR),
+ RDS_CM_EVENT_STRING(CONNECT_REQUEST),
+ RDS_CM_EVENT_STRING(CONNECT_RESPONSE),
+ RDS_CM_EVENT_STRING(CONNECT_ERROR),
+ RDS_CM_EVENT_STRING(UNREACHABLE),
+ RDS_CM_EVENT_STRING(REJECTED),
+ RDS_CM_EVENT_STRING(ESTABLISHED),
+ RDS_CM_EVENT_STRING(DISCONNECTED),
+ RDS_CM_EVENT_STRING(DEVICE_REMOVAL),
+ RDS_CM_EVENT_STRING(MULTICAST_JOIN),
+ RDS_CM_EVENT_STRING(MULTICAST_ERROR),
+ RDS_CM_EVENT_STRING(ADDR_CHANGE),
+ RDS_CM_EVENT_STRING(TIMEWAIT_EXIT),
+#undef RDS_CM_EVENT_STRING
+};
+
+static char *rds_cm_event_str(enum rdma_cm_event_type type)
+{
+ return rds_str_array(rds_cm_event_strings,
+ ARRAY_SIZE(rds_cm_event_strings), type);
+};
+
+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 (%s)\n", conn, cm_id,
+ event->event, rds_cm_event_str(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:
+ rdsdebug("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 "RDS: unknown event %u (%s)!\n",
+ event->event, rds_cm_event_str(event->event));
+ break;
+ }
+
+out:
+ if (conn)
+ mutex_unlock(&conn->c_cm_lock);
+
+ rdsdebug("id %p event %u (%s) handling ret %d\n", cm_id, event->event,
+ rds_cm_event_str(event->event), ret);
+
+ return ret;
+}
+
+static int 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,
+ IB_QPT_RC);
+ 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;
+ }
+}
+
+static int 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);
+
+static 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");
+
Code Review / kvmfornfv.git / blobdiff