netdev - Re: [PATCH RESEND v4 1/2] virtio-net: introduce and use helper function for guest gso support checks

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Date:   Wed, 31 Aug 2022 09:08:10 -0400
From:   "Michael S. Tsirkin" <mst@...hat.com>
To:     Gavin Li <gavinl@...dia.com>
Cc:     stephen@...workplumber.org, davem@...emloft.net,
        jesse.brandeburg@...el.com, alexander.h.duyck@...el.com,
        kuba@...nel.org, sridhar.samudrala@...el.com, jasowang@...hat.com,
        loseweigh@...il.com, netdev@...r.kernel.org,
        virtualization@...ts.linux-foundation.org,
        virtio-dev@...ts.oasis-open.org, gavi@...dia.com, parav@...dia.com,
        Xuan Zhuo <xuanzhuo@...ux.alibaba.com>,
        Si-Wei Liu <si-wei.liu@...cle.com>
Subject: Re: [PATCH RESEND v4 1/2] virtio-net: introduce and use helper
 function for guest gso support checks

On Wed, Aug 31, 2022 at 04:05:40PM +0300, Gavin Li wrote:
> Probe routine is already several hundred lines.
> Use helper function for guest gso support check.
> 
> Signed-off-by: Gavin Li <gavinl@...dia.com>
> Reviewed-by: Gavi Teitz <gavi@...dia.com>
> Reviewed-by: Parav Pandit <parav@...dia.com>
> Reviewed-by: Xuan Zhuo <xuanzhuo@...ux.alibaba.com>
> Reviewed-by: Si-Wei Liu <si-wei.liu@...cle.com>
> ---
> changelog:
> v1->v2
> - Add new patch
> ---
>  drivers/net/virtio_net.c | 13 +++++++++----
>  1 file changed, 9 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c
> index 9cce7dec7366..e1904877d461 100644
> --- a/drivers/net/virtio_net.c
> +++ b/drivers/net/virtio_net.c
> @@ -3682,6 +3682,14 @@ static int virtnet_validate(struct virtio_device *vdev)
>  	return 0;
>  }
>  
> +static bool virtnet_check_guest_gso(const struct virtnet_info *vi)
> +{
> +	return (virtio_has_feature(vi->vdev, VIRTIO_NET_F_GUEST_TSO4) ||
> +		virtio_has_feature(vi->vdev, VIRTIO_NET_F_GUEST_TSO6) ||
> +		virtio_has_feature(vi->vdev, VIRTIO_NET_F_GUEST_ECN) ||
> +		virtio_has_feature(vi->vdev, VIRTIO_NET_F_GUEST_UFO));
> +}
> +

fine but can we please drop the outer ()?
they are necessary with if but not with return.


>  static int virtnet_probe(struct virtio_device *vdev)
>  {
>  	int i, err = -ENOMEM;
> @@ -3777,10 +3785,7 @@ static int virtnet_probe(struct virtio_device *vdev)
>  	spin_lock_init(&vi->refill_lock);
>  
>  	/* If we can receive ANY GSO packets, we must allocate large ones. */
> -	if (virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_TSO4) ||
> -	    virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_TSO6) ||
> -	    virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_ECN) ||
> -	    virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_UFO))
> +	if (virtnet_check_guest_gso(vi))
>  		vi->big_packets = true;
>  
>  	if (virtio_has_feature(vdev, VIRTIO_NET_F_MRG_RXBUF))
> -- 
> 2.31.1