From 3763e7ef17143f5e9ae044638e65d2b0c0305fcf Mon Sep 17 00:00:00 2001 From: dingtianhong Date: Tue, 13 May 2014 14:39:27 +0800 Subject: [PATCH] macvlan: Propagate lowerdev MTU changes When the physical MTU changes we should ensure that all existing MACVLAN dev MTU do not exceed the new lowerdev MTU. This patch adds that propagation. Signed-off-by: Ding Tianhong Reviewed-by: Jiri Pirko Signed-off-by: David S. Miller --- drivers/net/macvlan.c | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/drivers/net/macvlan.c b/drivers/net/macvlan.c index f0118d1a3e46..e03707de1eee 100644 --- a/drivers/net/macvlan.c +++ b/drivers/net/macvlan.c @@ -1091,6 +1091,13 @@ static int macvlan_device_event(struct notifier_block *unused, netdev_update_features(vlan->dev); } break; + case NETDEV_CHANGEMTU: + list_for_each_entry(vlan, &port->vlans, list) { + if (vlan->dev->mtu <= dev->mtu) + continue; + dev_set_mtu(vlan->dev, dev->mtu); + } + break; case NETDEV_UNREGISTER: /* twiddle thumbs on netns device moves */ if (dev->reg_state != NETREG_UNREGISTERING) -- 2.34.1