From: Ding Tianhong <dingtianhong@huawei•com>
To: Patrick McHardy <kaber@trash•net>,
"David S. Miller" <davem@davemloft•net>,
Netdev <netdev@vger•kernel.org>
Subject: [PATCH net-next] macvlan: Propagate lowerdev MTU changes
Date: Tue, 13 May 2014 14:39:27 +0800 [thread overview]
Message-ID: <5371BE1F.7030508@huawei.com> (raw)
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 <dingtianhong@huawei•com>
---
drivers/net/macvlan.c | 7 +++++++
1 file changed, 7 insertions(+)
diff --git a/drivers/net/macvlan.c b/drivers/net/macvlan.c
index f0118d1..e03707d 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)
--
1.8.0
next reply other threads:[~2014-05-13 6:40 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-05-13 6:39 Ding Tianhong [this message]
2014-05-13 12:29 ` [PATCH net-next] macvlan: Propagate lowerdev MTU changes Jiri Pirko
2014-05-14 19:37 ` David Miller
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