netdev - Re: [PATCH v3 38/38] virtio_net: use LE accessors for speed/duplex

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Date:   Wed, 5 Aug 2020 15:59:48 +0200
From:   Cornelia Huck <cohuck@...hat.com>
To:     "Michael S. Tsirkin" <mst@...hat.com>
Cc:     linux-kernel@...r.kernel.org, Jason Wang <jasowang@...hat.com>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        virtualization@...ts.linux-foundation.org, netdev@...r.kernel.org
Subject: Re: [PATCH v3 38/38] virtio_net: use LE accessors for speed/duplex

On Wed, 5 Aug 2020 09:45:00 -0400
"Michael S. Tsirkin" <mst@...hat.com> wrote:

> Speed and duplex config fields depend on VIRTIO_NET_F_SPEED_DUPLEX
> which being 63>31 depends on VIRTIO_F_VERSION_1.
> 
> Accordingly, use LE accessors for these fields.
> 
> Reported-by: Cornelia Huck <cohuck@...hat.com>
> Signed-off-by: Michael S. Tsirkin <mst@...hat.com>
> ---
>  drivers/net/virtio_net.c        | 9 +++++----
>  include/uapi/linux/virtio_net.h | 2 +-
>  2 files changed, 6 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c
> index ba38765dc490..0934b1ec5320 100644
> --- a/drivers/net/virtio_net.c
> +++ b/drivers/net/virtio_net.c
> @@ -2264,12 +2264,13 @@ static void virtnet_update_settings(struct virtnet_info *vi)
>  	if (!virtio_has_feature(vi->vdev, VIRTIO_NET_F_SPEED_DUPLEX))
>  		return;
>  
> -	speed = virtio_cread32(vi->vdev, offsetof(struct virtio_net_config,
> -						  speed));
> +	virtio_cread_le(vi->vdev, struct virtio_net_config, speed, &speed);
> +
>  	if (ethtool_validate_speed(speed))
>  		vi->speed = speed;
> -	duplex = virtio_cread8(vi->vdev, offsetof(struct virtio_net_config,
> -						  duplex));
> +
> +	virtio_cread_le(vi->vdev, struct virtio_net_config, duplex, &duplex);

Looks a bit odd for an u8, but does not really hurt.

> +
>  	if (ethtool_validate_duplex(duplex))
>  		vi->duplex = duplex;
>  }
> diff --git a/include/uapi/linux/virtio_net.h b/include/uapi/linux/virtio_net.h
> index 27d996f29dd1..3f55a4215f11 100644
> --- a/include/uapi/linux/virtio_net.h
> +++ b/include/uapi/linux/virtio_net.h
> @@ -99,7 +99,7 @@ struct virtio_net_config {
>  	 * speed, in units of 1Mb. All values 0 to INT_MAX are legal.
>  	 * Any other value stands for unknown.
>  	 */
> -	__virtio32 speed;
> +	__le32 speed;
>  	/*
>  	 * 0x00 - half duplex
>  	 * 0x01 - full duplex

Reviewed-by: Cornelia Huck <cohuck@...hat.com>