From 8315011ad67670691545ed394968435f0a0bb29e Mon Sep 17 00:00:00 2001 From: Sowmini Varadhan Date: Thu, 30 Jun 2016 16:11:17 -0700 Subject: [PATCH] RDS: TCP: Simplify reconnect to avoid duelling reconnnect attempts When reconnecting, the peer with the smaller IP address will initiate the reconnect, to avoid needless duelling SYN issues. Acked-by: Santosh Shilimkar Signed-off-by: Sowmini Varadhan Signed-off-by: David S. Miller --- net/rds/connection.c | 4 +--- net/rds/threads.c | 5 +++++ 2 files changed, 6 insertions(+), 3 deletions(-) diff --git a/net/rds/connection.c b/net/rds/connection.c index 1b0c2a783b5e..19a4fee5f4dd 100644 --- a/net/rds/connection.c +++ b/net/rds/connection.c @@ -355,9 +355,7 @@ void rds_conn_shutdown(struct rds_conn_path *cp) rcu_read_lock(); if (!hlist_unhashed(&conn->c_hash_node)) { rcu_read_unlock(); - if (conn->c_trans->t_type != RDS_TRANS_TCP || - cp->cp_outgoing == 1) - rds_queue_reconnect(cp); + rds_queue_reconnect(cp); } else { rcu_read_unlock(); } diff --git a/net/rds/threads.c b/net/rds/threads.c index e8f0941f0548..bc97d67f29cc 100644 --- a/net/rds/threads.c +++ b/net/rds/threads.c @@ -125,6 +125,11 @@ void rds_queue_reconnect(struct rds_conn_path *cp) conn, &conn->c_laddr, &conn->c_faddr, cp->cp_reconnect_jiffies); + /* let peer with smaller addr initiate reconnect, to avoid duels */ + if (conn->c_trans->t_type == RDS_TRANS_TCP && + conn->c_laddr > conn->c_faddr) + return; + set_bit(RDS_RECONNECT_PENDING, &cp->cp_flags); if (cp->cp_reconnect_jiffies == 0) { cp->cp_reconnect_jiffies = rds_sysctl_reconnect_min_jiffies;