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virtio-net: Add initial MTU advice feature

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This commit adds the feature bit and associated mtu device entry for the
virtio network device.  When a virtio device comes up, it checks the
feature bit for the VIRTIO_NET_F_MTU feature.  If such feature bit is
enabled, the driver will read the advised MTU and use it as the initial
value.

Signed-off-by: Aaron Conole <aconole@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Aaron Conole
2016-06-03 16:57:12 -04:00
committed by David S. Miller
parent 3d9dc408fa
commit 14de9d114a
2 changed files with 13 additions and 0 deletions
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3
include/uapi/linux/virtio_net.h
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@@ -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 /* Initial MTU advice */
#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));
/*