From: Sowmini Varadhan <sowmini.varadhan@oracle.com>
Date: Tue, 5 May 2015 19:20:52 +0000 (-0400)
Subject: net/rds: RDS-TCP: only initiate reconnect attempt on outgoing TCP socket.
X-Git-Tag: firefly_0821_release~176^2~1783^2~24^2
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=c82ac7e69efe6dbe370d6ba84e2666d7692ef1c2;p=firefly-linux-kernel-4.4.55.git

net/rds: RDS-TCP: only initiate reconnect attempt on outgoing TCP socket.

When the peer of an RDS-TCP connection restarts, a reconnect
attempt should only be made from the active side  of the TCP
connection, i.e. the side that has a transient TCP port
number. Do not add the passive side of the TCP connection
to the c_hash_node and thus avoid triggering rds_queue_reconnect()
for passive rds connections.

Signed-off-by: Sowmini Varadhan <sowmini.varadhan@oracle.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
---

diff --git a/net/rds/connection.c b/net/rds/connection.c
index 60f0cd6ed15f..da6da57e5f36 100644
--- a/net/rds/connection.c
+++ b/net/rds/connection.c
@@ -234,13 +234,22 @@ new_conn:
 		/* Creating normal conn */
 		struct rds_connection *found;
 
-		found = rds_conn_lookup(head, laddr, faddr, trans);
+		if (!is_outgoing && otrans->t_type == RDS_TRANS_TCP)
+			found = NULL;
+		else
+			found = rds_conn_lookup(head, laddr, faddr, trans);
 		if (found) {
 			trans->conn_free(conn->c_transport_data);
 			kmem_cache_free(rds_conn_slab, conn);
 			conn = found;
 		} else {
-			hlist_add_head_rcu(&conn->c_hash_node, head);
+			if ((is_outgoing && otrans->t_type == RDS_TRANS_TCP) ||
+			    (otrans->t_type != RDS_TRANS_TCP)) {
+				/* Only the active side should be added to
+				 * reconnect list for TCP.
+				 */
+				hlist_add_head_rcu(&conn->c_hash_node, head);
+			}
 			rds_cong_add_conn(conn);
 			rds_conn_count++;
 		}