netdev - [PATCH] vlan: propogate MTU changes (v2)

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Message-ID: <20081006202554.11354b09@speedy>
Date:	Mon, 6 Oct 2008 20:25:54 +0200
From:	Stephen Hemminger <shemminger@...tta.com>
To:	Stephen Hemminger <shemminger@...tta.com>
Cc:	Patrick McHardy <kaber@...sh.net>,
	"David S. Miller" <davem@...emloft.net>, netdev@...r.kernel.org
Subject: [PATCH] vlan: propogate MTU changes (v2)

Propogate MTU changes of underlying device to all VLAN's and
send vlan MTU change out to userspace.

see: https://bugzilla.vyatta.com/show_bug.cgi?id=3742

Signed-off-by: Stephen Hemminger <shemminger@...tta.com>


--- a/net/8021q/vlan.c	2008-10-06 17:03:58.000000000 +0200
+++ b/net/8021q/vlan.c	2008-10-06 19:55:43.000000000 +0200
@@ -477,6 +477,17 @@ static int vlan_device_event(struct noti
 
 		break;
 
+	case NETDEV_CHANGEMTU:
+		/* Propogate MTU of underlying device */
+		for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
+			vlandev = vlan_group_get_device(grp, i);
+			if (!vlandev)
+				continue;
+
+			dev_set_mtu(vlandev, dev->mtu);
+		}
+		break;
+
 	case NETDEV_DOWN:
 		/* Put all VLANs for this dev in the down state too.  */
 		for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {

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