netdev - [PATCH v1] rds: If one path needs re-connection, check all and re-connect

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Date:   Wed,  1 Jul 2020 12:23:38 -0700
From:   rao.shoaib@...cle.com
To:     netdev@...r.kernel.org, linux-rdma@...r.kernel.org
Cc:     rao.shoaib@...cle.com, ka-cheong.poon@...cle.com,
        david.edmondson@...cle.com
Subject: [PATCH v1] rds: If one path needs re-connection, check all and re-connect

From: Rao Shoaib <rao.shoaib@...cle.com>

In testing with mprds enabled, Oracle Cluster nodes after reboot were
not able to communicate with others nodes and so failed to rejoin
the cluster. Peers with lower IP address initiated connection but the
node could not respond as it choose a different path and could not
initiate a connection as it had a higher IP address.

With this patch, when a node sends out a packet and the selected path
is down, all other paths are also checked and any down paths are
re-connected.

Reviewed-by: Ka-cheong Poon <ka-cheong.poon@...cle.com>
Reviewed-by: David Edmondson <david.edmondson@...cle.com>
Signed-off-by: Somasundaram Krishnasamy <somasundaram.krishnasamy@...cle.com>
Signed-off-by: Rao Shoaib <rao.shoaib@...cle.com>
---
 net/rds/connection.c | 11 +++++++++++
 net/rds/rds.h        |  7 +++++++
 net/rds/send.c       |  3 ++-
 3 files changed, 20 insertions(+), 1 deletion(-)

diff --git a/net/rds/connection.c b/net/rds/connection.c
index ed7f2133acc2..f2fcab182095 100644
--- a/net/rds/connection.c
+++ b/net/rds/connection.c
@@ -905,6 +905,17 @@ void rds_conn_path_connect_if_down(struct rds_conn_path *cp)
 }
 EXPORT_SYMBOL_GPL(rds_conn_path_connect_if_down);
 
+/* Check connectivity of all paths
+ */
+void rds_check_all_paths(struct rds_connection *conn)
+{
+	int i = 0;
+
+	do {
+		rds_conn_path_connect_if_down(&conn->c_path[i]);
+	} while (++i < conn->c_npaths);
+}
+
 void rds_conn_connect_if_down(struct rds_connection *conn)
 {
 	WARN_ON(conn->c_trans->t_mp_capable);
diff --git a/net/rds/rds.h b/net/rds/rds.h
index 6019b0c004a9..106e862996b9 100644
--- a/net/rds/rds.h
+++ b/net/rds/rds.h
@@ -778,6 +778,7 @@ void rds_conn_drop(struct rds_connection *conn);
 void rds_conn_path_drop(struct rds_conn_path *cpath, bool destroy);
 void rds_conn_connect_if_down(struct rds_connection *conn);
 void rds_conn_path_connect_if_down(struct rds_conn_path *cp);
+void rds_check_all_paths(struct rds_connection *conn);
 void rds_for_each_conn_info(struct socket *sock, unsigned int len,
 			  struct rds_info_iterator *iter,
 			  struct rds_info_lengths *lens,
@@ -822,6 +823,12 @@ rds_conn_path_up(struct rds_conn_path *cp)
 	return atomic_read(&cp->cp_state) == RDS_CONN_UP;
 }
 
+static inline int
+rds_conn_path_down(struct rds_conn_path *cp)
+{
+	return atomic_read(&cp->cp_state) == RDS_CONN_DOWN;
+}
+
 static inline int
 rds_conn_up(struct rds_connection *conn)
 {
diff --git a/net/rds/send.c b/net/rds/send.c
index 68e2bdb08fd0..9a529a01cdc6 100644
--- a/net/rds/send.c
+++ b/net/rds/send.c
@@ -1340,7 +1340,8 @@ int rds_sendmsg(struct socket *sock, struct msghdr *msg, size_t payload_len)
 		goto out;
 	}
 
-	rds_conn_path_connect_if_down(cpath);
+	if (rds_conn_path_down(cpath))
+		rds_check_all_paths(conn);
 
 	ret = rds_cong_wait(conn->c_fcong, dport, nonblock, rs);
 	if (ret) {
-- 
2.16.6