linux-kernel - Re: [virtio-dev] [PATCH] virtio_net: don't require ANY_LAYOUT with VERSION

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Message-ID: <55A6582F.5070500@redhat.com>
Date:	Wed, 15 Jul 2015 14:55:11 +0200
From:	Paolo Bonzini <pbonzini@...hat.com>
To:	"Michael S. Tsirkin" <mst@...hat.com>, linux-kernel@...r.kernel.org
Cc:	virtualization@...ts.linux-foundation.org, netdev@...r.kernel.org,
	Jason Wang <jasowang@...hat.com>,
	virtio-dev@...ts.oasis-open.org
Subject: Re: [virtio-dev] [PATCH] virtio_net: don't require ANY_LAYOUT with
 VERSION_1



On 15/07/2015 14:26, Michael S. Tsirkin wrote:
> ANY_LAYOUT is a compatibility feature. It's implied
> for VERSION_1 devices, and non-transitional devices
> might not offer it. Change code to behave accordingly.
> 
> Signed-off-by: Michael S. Tsirkin <mst@...hat.com>
> ---
>  drivers/net/virtio_net.c | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c
> index 63c7810..7fbca37 100644
> --- a/drivers/net/virtio_net.c
> +++ b/drivers/net/virtio_net.c
> @@ -1828,7 +1828,8 @@ static int virtnet_probe(struct virtio_device *vdev)
>  	else
>  		vi->hdr_len = sizeof(struct virtio_net_hdr);
>  
> -	if (virtio_has_feature(vdev, VIRTIO_F_ANY_LAYOUT))
> +	if (virtio_has_feature(vdev, VIRTIO_F_ANY_LAYOUT) ||
> +	    virtio_has_feature(vdev, VIRTIO_F_VERSION_1))
>  		vi->any_header_sg = true;
>  
>  	if (virtio_has_feature(vdev, VIRTIO_NET_F_CTRL_VQ))
> 

Reviewed-by: Paolo Bonzini <pbonzini@...hat.com>
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