From e918085aaff34086e265f825dd469926b1aec4a4 Mon Sep 17 00:00:00 2001 From: Alex Williamson 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 Acked-by: Mark McLoughlin Signed-off-by: David S. Miller --- drivers/net/virtio_net.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c index 43f6523..63ef2a8 100644 --- a/drivers/net/virtio_net.c +++ b/drivers/net/virtio_net.c @@ -24,6 +24,7 @@ #include #include #include +#include static int napi_weight = 128; module_param(napi_weight, int, 0444); @@ -33,7 +34,7 @@ module_param(csum, bool, 0444); module_param(gso, bool, 0444); /* FIXME: MTU in config. */ -#define MAX_PACKET_LEN (ETH_HLEN+ETH_DATA_LEN) +#define MAX_PACKET_LEN (ETH_HLEN + VLAN_HLEN + ETH_DATA_LEN) #define GOOD_COPY_LEN 128 struct virtnet_info -- 2.7.4