netdev - Re: [RFC PATCH 3/3] virtio_net: make lower netdevs for virtio

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Date:   Tue, 3 Apr 2018 15:20:27 +0300
From:   "Michael S. Tsirkin" <mst@...hat.com>
To:     Si-Wei Liu <si-wei.liu@...cle.com>
Cc:     jiri@...nulli.us, stephen@...workplumber.org,
        alexander.h.duyck@...el.com, davem@...emloft.net,
        jesse.brandeburg@...el.com, kubakici@...pl, jasowang@...hat.com,
        sridhar.samudrala@...el.com, netdev@...r.kernel.org,
        virtualization@...ts.linux-foundation.org,
        virtio-dev@...ts.oasis-open.org
Subject: Re: [RFC PATCH 3/3] virtio_net: make lower netdevs for virtio_bypass
 hidden

On Sun, Apr 01, 2018 at 05:13:10AM -0400, Si-Wei Liu wrote:
> diff --git a/include/uapi/linux/virtio_net.h b/include/uapi/linux/virtio_net.h
> index aa40664..0827b7e 100644
> --- a/include/uapi/linux/virtio_net.h
> +++ b/include/uapi/linux/virtio_net.h
> @@ -80,6 +80,8 @@ struct virtio_net_config {
>  	__u16 max_virtqueue_pairs;
>  	/* Default maximum transmit unit advice */
>  	__u16 mtu;
> +	/* Device at bus:slot.function backed up by virtio_net */
> +	__u16 bsf2backup;
>  } __attribute__((packed));

I'm not sure this is a good interface.  This isn't unique even on some
PCI systems, not to speak of non-PCI ones.

>  /*
> -- 
> 1.8.3.1