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

[Travis Brown]

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

Signed-off-by: Suresh Krishnan <skrish...@arista.com>
Signed-off-by: Travis Brown <trav...@arista.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