linux-kernel - Re: [PATCH v2 14/24] virtio_net: correct tags for config space fields

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Date:   Tue, 4 Aug 2020 16:44:44 +0200
From:   Cornelia Huck <cohuck@...hat.com>
To:     "Michael S. Tsirkin" <mst@...hat.com>
Cc:     linux-kernel@...r.kernel.org,
        virtualization@...ts.linux-foundation.org
Subject: Re: [PATCH v2 14/24] virtio_net: correct tags for config space
 fields

On Mon, 3 Aug 2020 16:59:37 -0400
"Michael S. Tsirkin" <mst@...hat.com> wrote:

> Tag config space fields as having virtio endian-ness.
> 
> Signed-off-by: Michael S. Tsirkin <mst@...hat.com>
> ---
>  include/uapi/linux/virtio_net.h | 8 ++++----
>  1 file changed, 4 insertions(+), 4 deletions(-)
> 
> diff --git a/include/uapi/linux/virtio_net.h b/include/uapi/linux/virtio_net.h
> index 19d23e5baa4e..27d996f29dd1 100644
> --- a/include/uapi/linux/virtio_net.h
> +++ b/include/uapi/linux/virtio_net.h
> @@ -87,19 +87,19 @@ struct virtio_net_config {
>  	/* The config defining mac address (if VIRTIO_NET_F_MAC) */
>  	__u8 mac[ETH_ALEN];
>  	/* See VIRTIO_NET_F_STATUS and VIRTIO_NET_S_* above */
> -	__u16 status;
> +	__virtio16 status;
>  	/* Maximum number of each of transmit and receive queues;
>  	 * see VIRTIO_NET_F_MQ and VIRTIO_NET_CTRL_MQ.
>  	 * Legal values are between 1 and 0x8000
>  	 */
> -	__u16 max_virtqueue_pairs;
> +	__virtio16 max_virtqueue_pairs;
>  	/* Default maximum transmit unit advice */
> -	__u16 mtu;
> +	__virtio16 mtu;
>  	/*
>  	 * speed, in units of 1Mb. All values 0 to INT_MAX are legal.
>  	 * Any other value stands for unknown.
>  	 */
> -	__u32 speed;
> +	__virtio32 speed;

Hm... VIRTIO_NET_F_SPEED_DUPLEX can only be negotiated if VERSION_1 has
also been negotiated; I think this should be __le32?

>  	/*
>  	 * 0x00 - half duplex
>  	 * 0x01 - full duplex