summaryrefslogtreecommitdiffstats
path: root/net/rds/rdma_transport.c
diff options
context:
space:
mode:
Diffstat (limited to 'net/rds/rdma_transport.c')
-rw-r--r--net/rds/rdma_transport.c322
1 files changed, 322 insertions, 0 deletions
diff --git a/net/rds/rdma_transport.c b/net/rds/rdma_transport.c
new file mode 100644
index 000000000..b15cf316b
--- /dev/null
+++ b/net/rds/rdma_transport.c
@@ -0,0 +1,322 @@
+/*
+ * Copyright (c) 2009, 2018 Oracle and/or its affiliates. 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 "rds_single_path.h"
+#include "rdma_transport.h"
+#include "ib.h"
+
+/* Global IPv4 and IPv6 RDS RDMA listener cm_id */
+static struct rdma_cm_id *rds_rdma_listen_id;
+#if IS_ENABLED(CONFIG_IPV6)
+static struct rdma_cm_id *rds6_rdma_listen_id;
+#endif
+
+/* Per IB specification 7.7.3, service level is a 4-bit field. */
+#define TOS_TO_SL(tos) ((tos) & 0xF)
+
+static int rds_rdma_cm_event_handler_cmn(struct rdma_cm_id *cm_id,
+ struct rdma_cm_event *event,
+ bool isv6)
+{
+ /* this can be null in the listening path */
+ struct rds_connection *conn = cm_id->context;
+ struct rds_transport *trans;
+ int ret = 0;
+ int *err;
+ u8 len;
+
+ rdsdebug("conn %p id %p handling event %u (%s)\n", conn, cm_id,
+ event->event, rdma_event_msg(event->event));
+
+ if (cm_id->device->node_type == RDMA_NODE_IB_CA)
+ 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, isv6);
+ break;
+
+ case RDMA_CM_EVENT_ADDR_RESOLVED:
+ if (conn) {
+ rdma_set_service_type(cm_id, conn->c_tos);
+ rdma_set_min_rnr_timer(cm_id, IB_RNR_TIMER_000_32);
+ /* 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:
+ /* Connection could have been dropped so make sure the
+ * cm_id is valid before proceeding
+ */
+ if (conn) {
+ struct rds_ib_connection *ibic;
+
+ ibic = conn->c_transport_data;
+ if (ibic && ibic->i_cm_id == cm_id) {
+ cm_id->route.path_rec[0].sl =
+ TOS_TO_SL(conn->c_tos);
+ ret = trans->cm_initiate_connect(cm_id, isv6);
+ } else {
+ rds_conn_drop(conn);
+ }
+ }
+ break;
+
+ case RDMA_CM_EVENT_ESTABLISHED:
+ if (conn)
+ trans->cm_connect_complete(conn, event);
+ break;
+
+ case RDMA_CM_EVENT_REJECTED:
+ if (!conn)
+ break;
+ err = (int *)rdma_consumer_reject_data(cm_id, event, &len);
+ if (!err ||
+ (err && len >= sizeof(*err) &&
+ ((*err) <= RDS_RDMA_REJ_INCOMPAT))) {
+ pr_warn("RDS/RDMA: conn <%pI6c, %pI6c> rejected, dropping connection\n",
+ &conn->c_laddr, &conn->c_faddr);
+
+ if (!conn->c_tos)
+ conn->c_proposed_version = RDS_PROTOCOL_COMPAT_VERSION;
+
+ rds_conn_drop(conn);
+ }
+ rdsdebug("Connection rejected: %s\n",
+ rdma_reject_msg(cm_id, event->status));
+ 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_DEVICE_REMOVAL:
+ case RDMA_CM_EVENT_ADDR_CHANGE:
+ if (conn)
+ rds_conn_drop(conn);
+ break;
+
+ case RDMA_CM_EVENT_DISCONNECTED:
+ if (!conn)
+ break;
+ rdsdebug("DISCONNECT event - dropping connection "
+ "%pI6c->%pI6c\n", &conn->c_laddr,
+ &conn->c_faddr);
+ rds_conn_drop(conn);
+ break;
+
+ case RDMA_CM_EVENT_TIMEWAIT_EXIT:
+ if (conn) {
+ pr_info("RDS: RDMA_CM_EVENT_TIMEWAIT_EXIT event: dropping connection %pI6c->%pI6c\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, rdma_event_msg(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,
+ rdma_event_msg(event->event), ret);
+
+ return ret;
+}
+
+int rds_rdma_cm_event_handler(struct rdma_cm_id *cm_id,
+ struct rdma_cm_event *event)
+{
+ return rds_rdma_cm_event_handler_cmn(cm_id, event, false);
+}
+
+#if IS_ENABLED(CONFIG_IPV6)
+int rds6_rdma_cm_event_handler(struct rdma_cm_id *cm_id,
+ struct rdma_cm_event *event)
+{
+ return rds_rdma_cm_event_handler_cmn(cm_id, event, true);
+}
+#endif
+
+static int rds_rdma_listen_init_common(rdma_cm_event_handler handler,
+ struct sockaddr *sa,
+ struct rdma_cm_id **ret_cm_id)
+{
+ struct rdma_cm_id *cm_id;
+ int ret;
+
+ cm_id = rdma_create_id(&init_net, 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;
+ }
+
+ /*
+ * 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, sa);
+ 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);
+
+ *ret_cm_id = cm_id;
+ cm_id = NULL;
+out:
+ if (cm_id)
+ rdma_destroy_id(cm_id);
+ return ret;
+}
+
+/* Initialize the RDS RDMA listeners. We create two listeners for
+ * compatibility reason. The one on RDS_PORT is used for IPv4
+ * requests only. The one on RDS_CM_PORT is used for IPv6 requests
+ * only. So only IPv6 enabled RDS module will communicate using this
+ * port.
+ */
+static int rds_rdma_listen_init(void)
+{
+ int ret;
+#if IS_ENABLED(CONFIG_IPV6)
+ struct sockaddr_in6 sin6;
+#endif
+ struct sockaddr_in sin;
+
+ sin.sin_family = PF_INET;
+ sin.sin_addr.s_addr = htonl(INADDR_ANY);
+ sin.sin_port = htons(RDS_PORT);
+ ret = rds_rdma_listen_init_common(rds_rdma_cm_event_handler,
+ (struct sockaddr *)&sin,
+ &rds_rdma_listen_id);
+ if (ret != 0)
+ return ret;
+
+#if IS_ENABLED(CONFIG_IPV6)
+ sin6.sin6_family = PF_INET6;
+ sin6.sin6_addr = in6addr_any;
+ sin6.sin6_port = htons(RDS_CM_PORT);
+ sin6.sin6_scope_id = 0;
+ sin6.sin6_flowinfo = 0;
+ ret = rds_rdma_listen_init_common(rds6_rdma_cm_event_handler,
+ (struct sockaddr *)&sin6,
+ &rds6_rdma_listen_id);
+ /* Keep going even when IPv6 is not enabled in the system. */
+ if (ret != 0)
+ rdsdebug("Cannot set up IPv6 RDMA listener\n");
+#endif
+ return 0;
+}
+
+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;
+ }
+#if IS_ENABLED(CONFIG_IPV6)
+ if (rds6_rdma_listen_id) {
+ rdsdebug("cm %p\n", rds6_rdma_listen_id);
+ rdma_destroy_id(rds6_rdma_listen_id);
+ rds6_rdma_listen_id = NULL;
+ }
+#endif
+}
+
+static int __init rds_rdma_init(void)
+{
+ int ret;
+
+ ret = rds_ib_init();
+ if (ret)
+ goto out;
+
+ ret = rds_rdma_listen_init();
+ if (ret)
+ rds_ib_exit();
+out:
+ return ret;
+}
+module_init(rds_rdma_init);
+
+static void __exit rds_rdma_exit(void)
+{
+ /* stop listening first to ensure no new connections are attempted */
+ rds_rdma_listen_stop();
+ rds_ib_exit();
+}
+module_exit(rds_rdma_exit);
+
+MODULE_AUTHOR("Oracle Corporation <rds-devel@oss.oracle.com>");
+MODULE_DESCRIPTION("RDS: IB transport");
+MODULE_LICENSE("Dual BSD/GPL");