virtio_net: Fix MAX_PACKET_LEN to support 802.1Q VLANs

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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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Alex Williamson 2009-01-25 18:06:26 -08:00 • committed by David S. Miller

parent 801599b0cd

commit e918085aaf

1 changed files with 2 additions and 1 deletions

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drivers/net/virtio_net.c

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