[RFC v2 -next 1/2] virtio: Start feature MTU support

From	Aaron Conole <aconole@redhat.com>
Newsgroups	linux.kernel
Subject	[RFC v2 -next 1/2] virtio: Start feature MTU support
Date	2016-03-15 22:10 +0100
Message-ID	<rd4o2-7FE-9@gated-at.bofh.it> (permalink)
References	<rd4o2-7FE-11@gated-at.bofh.it>
Organization	linux.* mail to news gateway

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This commit adds the feature bit and associated mtu device entry for the
virtio network device. Future commits will make use of these bits to support
negotiated MTU.

Signed-off-by: Aaron Conole <aconole@bytheb.org>
---
v2:
* No change

 include/uapi/linux/virtio_net.h | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/include/uapi/linux/virtio_net.h b/include/uapi/linux/virtio_net.h
index ec32293..41a6a01 100644
--- a/include/uapi/linux/virtio_net.h
+++ b/include/uapi/linux/virtio_net.h
@@ -55,6 +55,7 @@
 #define VIRTIO_NET_F_MQ	22	/* Device supports Receive Flow
 					 * Steering */
 #define VIRTIO_NET_F_CTRL_MAC_ADDR 23	/* Set MAC address */
+#define VIRTIO_NET_F_MTU 25	/* Device supports Default MTU Negotiation */
 
 #ifndef VIRTIO_NET_NO_LEGACY
 #define VIRTIO_NET_F_GSO	6	/* Host handles pkts w/ any GSO type */
@@ -73,6 +74,8 @@ struct virtio_net_config {
 	 * Legal values are between 1 and 0x8000
 	 */
 	__u16 max_virtqueue_pairs;
+	/* Default maximum transmit unit advice */
+	__u16 mtu;
 } __attribute__((packed));
 
 /*
-- 
2.5.0

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[RFC v2 -next 1/2] virtio: Start feature MTU support Aaron Conole <aconole@redhat.com> - 2016-03-15 22:10 +0100
  Re: [RFC v2 -next 1/2] virtio: Start feature MTU support Stephen Hemminger <stephen@networkplumber.org> - 2016-03-16 19:30 +0100
    Re: [RFC v2 -next 1/2] virtio: Start feature MTU support "Michael S. Tsirkin" <mst@redhat.com> - 2016-03-16 19:40 +0100

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