[Qemu-devel] [RFC 1/4] virtio-net: reuse MTU related bits from Linux header

[Maxime Coquelin <maxime.coquelin@redhat.com>]

VIRTIO_NET_F_MTU has been introduced in Linux v4.8-rc1.
Reuse its define and the related virtio_net_config struct
update.

Cc: Michael S. Tsirkin <mst@redhat.com>
Cc: Aaron Conole <aconole@redhat.com>
Signed-off-by: Maxime Coquelin <maxime.coquelin@redhat.com>
---
 include/standard-headers/linux/virtio_net.h | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/include/standard-headers/linux/virtio_net.h b/include/standard-headers/linux/virtio_net.h
index a78f33e..30ff249 100644
--- a/include/standard-headers/linux/virtio_net.h
+++ b/include/standard-headers/linux/virtio_net.h
@@ -35,6 +35,7 @@
 #define VIRTIO_NET_F_CSUM	0	/* Host handles pkts w/ partial csum */
 #define VIRTIO_NET_F_GUEST_CSUM	1	/* Guest handles pkts w/ partial csum */
 #define VIRTIO_NET_F_CTRL_GUEST_OFFLOADS 2 /* Dynamic offload configuration. */
+#define VIRTIO_NET_F_MTU	3	/* Initial MTU advice */
 #define VIRTIO_NET_F_MAC	5	/* Host has given MAC address. */
 #define VIRTIO_NET_F_GUEST_TSO4	7	/* Guest can handle TSOv4 in. */
 #define VIRTIO_NET_F_GUEST_TSO6	8	/* Guest can handle TSOv6 in. */
@@ -73,6 +74,8 @@ struct virtio_net_config {
 	 * Legal values are between 1 and 0x8000
 	 */
 	uint16_t max_virtqueue_pairs;
+	/* Default maximum transmit unit advice */
+	uint16_t mtu;
 } QEMU_PACKED;
 
 /*
-- 
2.7.4