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authorAlex Williamson <alex.williamson@hp.com>2009-01-25 18:06:26 -0800
committerDavid S. Miller <davem@davemloft.net>2009-01-25 18:06:26 -0800
commite918085aaff34086e265f825dd469926b1aec4a4 (patch)
treecdd8c27d63026efb387ce585dd738b299f9f3479 /drivers/net/virtio_net.c
parent801599b0cd4c026a18fb9fce436eae4459f799a6 (diff)
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>
Diffstat (limited to 'drivers/net/virtio_net.c')
-rw-r--r--drivers/net/virtio_net.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c
index 43f6523c40be..63ef2a8905fb 100644
--- a/drivers/net/virtio_net.c
+++ b/drivers/net/virtio_net.c
@@ -24,6 +24,7 @@
#include <linux/virtio.h>
#include <linux/virtio_net.h>
#include <linux/scatterlist.h>
+#include <linux/if_vlan.h>
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