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vlan: Propagate physical MTU changes 

When the physical MTU changes we want to ensure that all existing
VLAN device MTUs do not exceed the new underlying MTU.  This patch
adds that propagation.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Herbert Xu 2009-07-20 07:35:37 -07:00 committed by David S. Miller
parent 37cf2b8d16
commit 2e477c9bd2
1 changed files with 13 additions and 0 deletions
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13
net/8021q/vlan.c
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@ -468,6 +468,19 @@ static int vlan_device_event(struct notifier_block *unused, unsigned long event,
}
break;
case NETDEV_CHANGEMTU:
for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
vlandev = vlan_group_get_device(grp, i);
if (!vlandev)
continue;
if (vlandev->mtu <= dev->mtu)
continue;
dev_set_mtu(vlandev, dev->mtu);
}
break;
case NETDEV_FEAT_CHANGE:
/* Propagate device features to underlying device */
for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {