linux-kernel - [PATCH net v2] bonding/802.3ad: fix link_failure

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Date:   Sun,  4 Nov 2018 14:59:46 -0500
From:   Jarod Wilson <jarod@...hat.com>
To:     linux-kernel@...r.kernel.org
Cc:     Jarod Wilson <jarod@...hat.com>,
        Mahesh Bandewar <maheshb@...gle.com>,
        "David S . Miller" <davem@...emloft.net>, netdev@...r.kernel.org,
        stable@...r.kernel.org
Subject: [PATCH net v2] bonding/802.3ad: fix link_failure_count tracking

Commit 4d2c0cda07448ea6980f00102dc3964eb25e241c set slave->link to
BOND_LINK_DOWN for 802.3ad bonds whenever invalid speed/duplex values
were read, to fix a problem with slaves getting into weird states, but
in the process, broke tracking of link failures, as going straight to
BOND_LINK_DOWN when a link is indeed down (cable pulled, switch rebooted)
means we broke out of bond_miimon_inspect()'s BOND_LINK_DOWN case because
!link_state was already true, we never incremented commit, and never got
a chance to call bond_miimon_commit(), where slave->link_failure_count
would be incremented. I believe the simple fix here is to mark the slave
as BOND_LINK_FAIL, and let bond_miimon_inspect() transition the link from
_FAIL to either _UP or _DOWN, and in the latter case, we now get proper
incrementing of link_failure_count again.

Fixes: 4d2c0cda0744 ("bonding: speed/duplex update at NETDEV_UP event")
CC: Mahesh Bandewar <maheshb@...gle.com>
CC: David S. Miller <davem@...emloft.net>
CC: netdev@...r.kernel.org
CC: stable@...r.kernel.org
Signed-off-by: Jarod Wilson <jarod@...hat.com>
---
v2: fix Fixes line

 drivers/net/bonding/bond_main.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/net/bonding/bond_main.c b/drivers/net/bonding/bond_main.c
index ffa37adb7681..333387f1f1fe 100644
--- a/drivers/net/bonding/bond_main.c
+++ b/drivers/net/bonding/bond_main.c
@@ -3112,13 +3112,13 @@ static int bond_slave_netdev_event(unsigned long event,
 	case NETDEV_CHANGE:
 		/* For 802.3ad mode only:
 		 * Getting invalid Speed/Duplex values here will put slave
-		 * in weird state. So mark it as link-down for the time
+		 * in weird state. So mark it as link-fail for the time
 		 * being and let link-monitoring (miimon) set it right when
 		 * correct speeds/duplex are available.
 		 */
 		if (bond_update_speed_duplex(slave) &&
 		    BOND_MODE(bond) == BOND_MODE_8023AD)
-			slave->link = BOND_LINK_DOWN;
+			slave->link = BOND_LINK_FAIL;

 		if (BOND_MODE(bond) == BOND_MODE_8023AD)
 			bond_3ad_adapter_speed_duplex_changed(slave);
-- 
2.16.1