netdev - [PATCH net-next] macvlan: Change status when lower device goes down

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Message-Id: <20180710003501.13971-1-travisb@arista.com>
Date:   Tue, 10 Jul 2018 00:35:01 +0000
From:   Travis Brown <travisb@...sta.com>
To:     netdev@...r.kernel.org
Cc:     Travis Brown <travisb@...sta.com>,
        Suresh Krishnan <skrishnan@...sta.com>
Subject: [PATCH net-next] macvlan: Change status when lower device goes down

Today macvlan ignores the notification when a lower device goes
administratively down, preventing the lack of connectivity from
bubbling up.

Processing NETDEV_DOWN results in a macvlan state of LOWERLAYERDOWN
with NO-CARRIER which should be easy to interpret in userspace.

2: lower: <BROADCAST,MULTICAST> mtu 1500 qdisc mq state DOWN mode DEFAULT group default qlen 1000
3: macvlan@...er: <NO-CARRIER,BROADCAST,MULTICAST,UP,M-DOWN> mtu 1500 qdisc noqueue state LOWERLAYERDOWN mode DEFAULT group default qlen 1000

Signed-off-by: Suresh Krishnan <skrishnan@...sta.com>
Signed-off-by: Travis Brown <travisb@...sta.com>
---
 drivers/net/macvlan.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/net/macvlan.c b/drivers/net/macvlan.c
index adde8fc45588..6dcd715a9370 100644
--- a/drivers/net/macvlan.c
+++ b/drivers/net/macvlan.c
@@ -1647,6 +1647,7 @@ static int macvlan_device_event(struct notifier_block *unused,
 
 	switch (event) {
 	case NETDEV_UP:
+	case NETDEV_DOWN:
 	case NETDEV_CHANGE:
 		list_for_each_entry(vlan, &port->vlans, list)
 			netif_stacked_transfer_operstate(vlan->lowerdev,
-- 
2.16.1