Subject: Re: [PATCH vhost 08/22] virtio_net: virtnet_poll_tx support rescheduled

From: "Michael S. Tsirkin" <[email-masked]>
Date: Thu, 12 Oct 2023 05:13:11 -0400

On Wed, Oct 11, 2023 at 05:27:14PM +0800, Xuan Zhuo wrote:
> virtnet_poll_tx() support to return budget when busy to be rescheduled.
> 
> When retval < budget, napi_poll() in dev.c will exit directly. And
> virtqueue_napi_complete() will be called to close napi.
> 
> When retval == budget, the napi_poll() in dev.c will re-add napi to the
> queue.
> 
> The purpose of this patch is to support xsk xmit in virtio_poll_tx() for
> subsequent patch.
> 
> Signed-off-by: Xuan Zhuo <[email-masked]>
> ---
>  drivers/net/virtio/main.c | 6 ++++++
>  1 file changed, 6 insertions(+)
> 
> diff --git a/drivers/net/virtio/main.c b/drivers/net/virtio/main.c
> index bcfd31a55076..f32cfa189972 100644
> --- a/drivers/net/virtio/main.c
> +++ b/drivers/net/virtio/main.c
> @@ -1976,6 +1976,7 @@ static int virtnet_poll_tx(struct napi_struct *napi, int budget)
>  	struct virtnet_info *vi = sq->vq->vdev->priv;
>  	unsigned int index = vq2txq(sq->vq);
>  	struct netdev_queue *txq;
> +	int busy = 0;
>  	int opaque;
>  	bool done;
>  
> @@ -1993,6 +1994,11 @@ static int virtnet_poll_tx(struct napi_struct *napi, int budget)
>  	if (sq->vq->num_free >= 2 + MAX_SKB_FRAGS)
>  		netif_tx_wake_queue(txq);
>  
> +	if (busy) {
> +		__netif_tx_unlock(txq);
> +		return budget;
> +	}
> +
>  	opaque = virtqueue_enable_cb_prepare(sq->vq);
>  
>  	done = napi_complete_done(napi, 0);

This just adds a bit of dead code.
Pls just squash into that patch.

> -- 
> 2.32.0.3.g01195cf9f