RDS: TCP: Enable multipath RDS for TCP
Use RDS probe-ping to compute how many paths may be used with
the peer, and to synchronously start the multiple paths. If mprds is
supported, hash outgoing traffic to one of multiple paths in rds_sendmsg()
when multipath RDS is supported by the transport.
CC: Santosh Shilimkar <santosh.shilimkar@oracle.com>
Signed-off-by: Sowmini Varadhan <sowmini.varadhan@oracle.com>
Acked-by: Santosh Shilimkar <santosh.shilimkar@oracle.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/rds/tcp_connect.c b/net/rds/tcp_connect.c
index c916715..05f61c5 100644
--- a/net/rds/tcp_connect.c
+++ b/net/rds/tcp_connect.c
@@ -34,7 +34,6 @@
#include <linux/in.h>
#include <net/tcp.h>
-#include "rds_single_path.h"
#include "rds.h"
#include "tcp.h"
@@ -82,6 +81,12 @@
struct rds_connection *conn = cp->cp_conn;
struct rds_tcp_connection *tc = cp->cp_transport_data;
+ /* for multipath rds,we only trigger the connection after
+ * the handshake probe has determined the number of paths.
+ */
+ if (cp->cp_index > 0 && cp->cp_conn->c_npaths < 2)
+ return -EAGAIN;
+
mutex_lock(&tc->t_conn_path_lock);
if (rds_conn_path_up(cp)) {