On Tue, Jan 02, 2018 at 04:35:37PM -0800, Sridhar Samudrala wrote:
> This feature bit can be used by hypervisor to indicate virtio_net device to
> act as a master for a directly attached passthru device with the same MAC
> address.
>
> Signed-off-by: Sridhar Samudrala <sridhar.samudrala@xxxxxxxxx>
> ---
> drivers/net/virtio_net.c | 3 ++-
> include/uapi/linux/virtio_net.h | 1 +
> 2 files changed, 3 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c
> index 6fb7b658a6cc..46844a1d9a62 100644
> --- a/drivers/net/virtio_net.c
> +++ b/drivers/net/virtio_net.c
> @@ -2796,7 +2796,8 @@ static struct virtio_device_id id_table[] = {
> VIRTIO_NET_F_CTRL_RX, VIRTIO_NET_F_CTRL_VLAN, \
> VIRTIO_NET_F_GUEST_ANNOUNCE, VIRTIO_NET_F_MQ, \
> VIRTIO_NET_F_CTRL_MAC_ADDR, \
> - VIRTIO_NET_F_MTU, VIRTIO_NET_F_CTRL_GUEST_OFFLOADS
> + VIRTIO_NET_F_MTU, VIRTIO_NET_F_CTRL_GUEST_OFFLOADS, \
> + VIRTIO_NET_F_MASTER
>
> static unsigned int features[] = {
> VIRTNET_FEATURES,
> diff --git a/include/uapi/linux/virtio_net.h b/include/uapi/linux/virtio_net.h
> index fc353b518288..a9b4e0836786 100644
> --- a/include/uapi/linux/virtio_net.h
> +++ b/include/uapi/linux/virtio_net.h
> @@ -56,6 +56,7 @@
> #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_MASTER 62 /* act as master for a VF device */
Well the virtio hardware doesn't really know whether it's a master or
the slave of a bond. In fact quite possibly down the road we'll add a
virtual device on top as others seem to want to do - that other one will
be the master then.
And we do nothing do check it's a VF.
So maybe a better name would be
#define VIRTIO_NET_F_BACKUP 62 /* Act as backup for another device with the same MAC */
>
> #ifndef VIRTIO_NET_NO_LEGACY
> #define VIRTIO_NET_F_GSO 6 /* Host handles pkts w/ any GSO type */
> --
> 2.14.3
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