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authorHerbert Xu <herbert@gondor.apana.org.au>2009-07-20 07:35:37 -0700
committerDavid S. Miller <davem@davemloft.net>2009-07-20 07:35:37 -0700
commit2e477c9bd2bb6a1606e498adb53ba913378ecdf2 (patch)
treefc1e7b9488cac5a66ac1c5f2196a2400fe5fdf52
parent37cf2b8d1622897cf57e70cdab9eba57feb5ff6c (diff)
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>
-rw-r--r--net/8021q/vlan.c13
1 files changed, 13 insertions, 0 deletions
diff --git a/net/8021q/vlan.c b/net/8021q/vlan.c
index fe649081fbdc..6d37b7e2a767 100644
--- a/net/8021q/vlan.c
+++ b/net/8021q/vlan.c
@@ -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++) {