netdev - Re: [PATCH v3 1/2] virtio-net: introduce and use helper function for guest gso support checks

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Date:   Tue, 30 Aug 2022 10:31:02 +0800
From:   Xuan Zhuo <xuanzhuo@...ux.alibaba.com>
To:     Gavin Li <gavinl@...dia.com>
Cc:     <gavi@...dia.com>, <parav@...dia.com>,
        <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>, <mst@...hat.com>
Subject: Re: [PATCH v3 1/2] virtio-net: introduce and use helper function for guest gso support checks

On Tue, 30 Aug 2022 05:26:33 +0300, Gavin Li <gavinl@...dia.com> 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>

> ---
> 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));
> +}
> +
>  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
>