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authorHerbert Xu <herbert@gondor.apana.org.au>2009-07-20 10:35:37 -0400
committerDavid S. Miller <davem@davemloft.net>2009-07-20 10:35:37 -0400
commit2e477c9bd2bb6a1606e498adb53ba913378ecdf2 (patch)
treefc1e7b9488cac5a66ac1c5f2196a2400fe5fdf52 /net
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>
Diffstat (limited to '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,
468 } 468 }
469 break; 469 break;
470 470
471 case NETDEV_CHANGEMTU:
472 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
473 vlandev = vlan_group_get_device(grp, i);
474 if (!vlandev)
475 continue;
476
477 if (vlandev->mtu <= dev->mtu)
478 continue;
479
480 dev_set_mtu(vlandev, dev->mtu);
481 }
482 break;
483
471 case NETDEV_FEAT_CHANGE: 484 case NETDEV_FEAT_CHANGE:
472 /* Propagate device features to underlying device */ 485 /* Propagate device features to underlying device */
473 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) { 486 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {