Initial import

1 files changed, 251 insertions, 0 deletions

diff --git a/net/rds/rdma_transport.c b/net/rds/rdma_transport.c
new file mode 100644
index 000000000..6cd9d1dea
--- /dev/null
+++ b/net/rds/rdma_transport.c
@@ -0,0 +1,251 @@
+/*
+ * 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");
+