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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 /net/8021q/vlan.c
parent37cf2b8d1622897cf57e70cdab9eba57feb5ff6c (diff)
downloadlwn-2e477c9bd2bb6a1606e498adb53ba913378ecdf2.tar.gz
lwn-2e477c9bd2bb6a1606e498adb53ba913378ecdf2.zip
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>
Diffstat (limited to 'net/8021q/vlan.c')
-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++) {