linux-kernel - Re: [PATCH RFC 4/4] virtio_net: bigger header when VERSION

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Message-ID: <87wq7l9gw8.fsf@rustcorp.com.au>
Date:	Tue, 28 Oct 2014 10:58:39 +1030
From:	Rusty Russell <rusty@...tcorp.com.au>
To:	"Michael S. Tsirkin" <mst@...hat.com>, linux-kernel@...r.kernel.org
Cc:	cornelia.huck@...ibm.com,
	virtualization@...ts.linux-foundation.org, netdev@...r.kernel.org
Subject: Re: [PATCH RFC 4/4] virtio_net: bigger header when VERSION_1 is set

"Michael S. Tsirkin" <mst@...hat.com> writes:
> With VERSION_1 virtio_net uses same header size
> whether mergeable buffers are enabled or not.
>
> Signed-off-by: Michael S. Tsirkin <mst@...hat.com>

These two are great too, thanks:

Acked-by: Rusty Russell <rusty@...tcorp.com.au>

Cheers,
Rusty.

> ---
>  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 9c6d50f..a2fe340 100644
> --- a/drivers/net/virtio_net.c
> +++ b/drivers/net/virtio_net.c
> @@ -1764,7 +1764,8 @@ static int virtnet_probe(struct virtio_device *vdev)
>  	if (virtio_has_feature(vdev, VIRTIO_NET_F_MRG_RXBUF))
>  		vi->mergeable_rx_bufs = true;
>  
> -	if (virtio_has_feature(vdev, VIRTIO_NET_F_MRG_RXBUF))
> +	if (virtio_has_feature(vdev, VIRTIO_NET_F_MRG_RXBUF) ||
> +	    virtio_has_feature(vdev, VIRTIO_F_VERSION_1))
>  		vi->hdr_len = sizeof(struct virtio_net_hdr_mrg_rxbuf);
>  	else
>  		vi->hdr_len = sizeof(struct virtio_net_hdr);
> -- 
> MST
--
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