linux-kernel - [PATCH] bonding:avoid repeated display of same link status change

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Message-Id: <20181031105729.7442-1-mk.singh@oracle.com>
Date:   Wed, 31 Oct 2018 16:27:28 +0530
From:   mk.singh@...cle.com
To:     netdev@...r.kernel.org
Cc:     eric.dumazet@...il.com, mkubecek@...e.cz,
        Manish Kumar Singh <mk.singh@...cle.com>,
        Jay Vosburgh <j.vosburgh@...il.com>,
        Veaceslav Falico <vfalico@...il.com>,
        Andy Gospodarek <andy@...yhouse.net>,
        "David S. Miller" <davem@...emloft.net>,
        linux-kernel@...r.kernel.org
Subject: [PATCH] bonding:avoid repeated display of same link status change

From: Manish Kumar Singh <mk.singh@...cle.com>

When link status change needs to be committed and rtnl lock couldn't be
taken, avoid redisplay of same link status change message.

Signed-off-by: Manish Kumar Singh <mk.singh@...cle.com>
---
 drivers/net/bonding/bond_main.c | 8 ++++++--
 include/net/bonding.h           | 1 +
 2 files changed, 7 insertions(+), 2 deletions(-)

diff --git a/drivers/net/bonding/bond_main.c b/drivers/net/bonding/bond_main.c
index 2b01180be834..b3d95c7040ac 100644
--- a/drivers/net/bonding/bond_main.c
+++ b/drivers/net/bonding/bond_main.c
@@ -2096,7 +2096,8 @@ static int bond_miimon_inspect(struct bonding *bond)
 			bond_propose_link_state(slave, BOND_LINK_FAIL);
 			commit++;
 			slave->delay = bond->params.downdelay;
-			if (slave->delay) {
+			if (slave->delay &&
+			    !atomic64_read(&bond->rtnl_needed)) {
 				netdev_info(bond->dev, "link status down for %sinterface %s, disabling it in %d ms\n",
 					    (BOND_MODE(bond) ==
 					     BOND_MODE_ACTIVEBACKUP) ?
@@ -2136,7 +2137,8 @@ static int bond_miimon_inspect(struct bonding *bond)
 			commit++;
 			slave->delay = bond->params.updelay;
 
-			if (slave->delay) {
+			if (slave->delay &&
+			    !atomic64_read(&bond->rtnl_needed)) {
 				netdev_info(bond->dev, "link status up for interface %s, enabling it in %d ms\n",
 					    slave->dev->name,
 					    ignore_updelay ? 0 :
@@ -2310,9 +2312,11 @@ static void bond_mii_monitor(struct work_struct *work)
 		if (!rtnl_trylock()) {
 			delay = 1;
 			should_notify_peers = false;
+			atomic64_set(&bond->rtnl_needed, 1);
 			goto re_arm;
 		}
 
+		atomic64_set(&bond->rtnl_needed, 0);
 		bond_for_each_slave(bond, slave, iter) {
 			bond_commit_link_state(slave, BOND_SLAVE_NOTIFY_LATER);
 		}
diff --git a/include/net/bonding.h b/include/net/bonding.h
index a4f116f06c50..20c3c875266f 100644
--- a/include/net/bonding.h
+++ b/include/net/bonding.h
@@ -229,6 +229,7 @@ struct bonding {
 	struct	 dentry *debug_dir;
 #endif /* CONFIG_DEBUG_FS */
 	struct rtnl_link_stats64 bond_stats;
+	atomic64_t rtnl_needed;
 };
 
 #define bond_slave_get_rcu(dev) \
-- 
2.14.1