From e918085aaff34086e265f825dd469926b1aec4a4 Mon Sep 17 00:00:00 2001
From: Alex Williamson <alex.williamson@hp.com>
Date: Sun, 25 Jan 2009 18:06:26 -0800
Subject: [PATCH] virtio_net: Fix MAX_PACKET_LEN to support 802.1Q VLANs

802.1Q expanded the maximum ethernet frame size by 4 bytes for the
VLAN tag.  We're not taking this into account in virtio_net, which
means the buffers we provide to the backend in the virtqueue RX ring
aren't big enough to hold a full MTU VLAN packet.  For QEMU/KVM,
this results in the backend exiting with a packet truncation error.

Signed-off-by: Alex Williamson <alex.williamson@hp.com>
Acked-by: Mark McLoughlin <markmc@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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