From: Alex Williamson <alex.williamson@hp.com>
Date: Fri, 13 Feb 2009 08:06:29 +0000 (-0800)
Subject: virtio_net: Fix MAX_PACKET_LEN to support 802.1Q VLANs
X-Git-Tag: v2.6.27.18~18
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=80156b7e084cf364ce325d898f0b29de7ab24abc;p=pandora-kernel.git

virtio_net: Fix MAX_PACKET_LEN to support 802.1Q VLANs

[ Upstream commit e918085aaff34086e265f825dd469926b1aec4a4 ]

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>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
---

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