Commit 2e477c9b authored by Herbert Xu's avatar Herbert Xu Committed by David S. Miller
Browse files

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: default avatarHerbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 37cf2b8d

net/8021q/vlan.c

+13 −0
Original line number Diff line number Diff line
@@ -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++) {