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macvlan: Propagate lowerdev MTU changes

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When the physical MTU changes we should ensure that all existing MACVLAN
dev MTU do not exceed the new lowerdev MTU. This patch adds that
propagation.

Signed-off-by: Ding Tianhong <dingtianhong@huawei.com>
Reviewed-by: Jiri Pirko <jiri@resnulli.us>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
dingtianhong 2014-05-13 14:39:27 +08:00 committed by David S. Miller
parent 8ba7e7bfc3
commit 3763e7ef17
1 changed files with 7 additions and 0 deletions
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7
drivers/net/macvlan.c
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@ -1091,6 +1091,13 @@ static int macvlan_device_event(struct notifier_block *unused,
netdev_update_features(vlan->dev);
}
break;
case NETDEV_CHANGEMTU:
list_for_each_entry(vlan, &port->vlans, list) {
if (vlan->dev->mtu <= dev->mtu)
continue;
dev_set_mtu(vlan->dev, dev->mtu);
}
break;
case NETDEV_UNREGISTER:
/* twiddle thumbs on netns device moves */
if (dev->reg_state != NETREG_UNREGISTERING)