netdev - Re: [PATCH net-next 1/5] virtio-net: returns whether napi is complete

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Date: Wed, 25 Oct 2023 10:43:01 +0800
From: Jason Wang <jasowang@...hat.com>
To: Heng Qi <hengqi@...ux.alibaba.com>
Cc: "Michael S. Tsirkin" <mst@...hat.com>, netdev@...r.kernel.org, 
	virtualization@...ts.linux-foundation.org, 
	Xuan Zhuo <xuanzhuo@...ux.alibaba.com>, Eric Dumazet <edumazet@...gle.com>, 
	"David S. Miller" <davem@...emloft.net>, Paolo Abeni <pabeni@...hat.com>, 
	Jesper Dangaard Brouer <hawk@...nel.org>, John Fastabend <john.fastabend@...il.com>, 
	Alexei Starovoitov <ast@...nel.org>, Jakub Kicinski <kuba@...nel.org>, Simon Horman <horms@...nel.org>, 
	"Liu, Yujie" <yujie.liu@...el.com>
Subject: Re: [PATCH net-next 1/5] virtio-net: returns whether napi is complete

On Thu, Oct 12, 2023 at 3:44 PM Heng Qi <hengqi@...ux.alibaba.com> wrote:
>
> rx netdim needs to count the traffic during a complete napi process,
> and start updating and comparing samples to make decisions after
> the napi ends. Let virtqueue_napi_complete() return true if napi is done,
> otherwise vice versa.
>
> Signed-off-by: Heng Qi <hengqi@...ux.alibaba.com>

Acked-by: Jason Wang <jasowang@...hat.com>

Thanks

> ---
>  drivers/net/virtio_net.c | 6 +++++-
>  1 file changed, 5 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c
> index a52fd743504a..cf5d2ef4bd24 100644
> --- a/drivers/net/virtio_net.c
> +++ b/drivers/net/virtio_net.c
> @@ -431,7 +431,7 @@ static void virtqueue_napi_schedule(struct napi_struct *napi,
>         }
>  }
>
> -static void virtqueue_napi_complete(struct napi_struct *napi,
> +static bool virtqueue_napi_complete(struct napi_struct *napi,
>                                     struct virtqueue *vq, int processed)
>  {
>         int opaque;
> @@ -440,9 +440,13 @@ static void virtqueue_napi_complete(struct napi_struct *napi,
>         if (napi_complete_done(napi, processed)) {
>                 if (unlikely(virtqueue_poll(vq, opaque)))
>                         virtqueue_napi_schedule(napi, vq);
> +               else
> +                       return true;
>         } else {
>                 virtqueue_disable_cb(vq);
>         }
> +
> +       return false;
>  }
>
>  static void skb_xmit_done(struct virtqueue *vq)
> --
> 2.19.1.6.gb485710b
>