netdev - Re: [PATCH net-next] net: virtio: unify code to init stats

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Message-ID: <1718871314.1931674-1-xuanzhuo@linux.alibaba.com>
Date: Thu, 20 Jun 2024 16:15:14 +0800
From: Xuan Zhuo <xuanzhuo@...ux.alibaba.com>
To: "Michael S. Tsirkin" <mst@...hat.com>
Cc: Jason Wang <jasowang@...hat.com>,
 Eugenio Pérez <eperezma@...hat.com>,
 "David S. Miller" <davem@...emloft.net>,
 Eric Dumazet <edumazet@...gle.com>,
 Jakub Kicinski <kuba@...nel.org>,
 Paolo Abeni <pabeni@...hat.com>,
 virtualization@...ts.linux.dev,
 netdev@...r.kernel.org,
 Jiri Pirko <jiri@...nulli.us>,
 linux-kernel@...r.kernel.org
Subject: Re: [PATCH net-next] net: virtio: unify code to init stats

On Thu, 20 Jun 2024 03:44:53 -0400, "Michael S. Tsirkin" <mst@...hat.com> wrote:
> Moving initialization of stats structure into
> __free_old_xmit reduces the code size slightly.
> It also makes it clearer that this function shouldn't
> be called multiple times on the same stats struct.
>
> Signed-off-by: Michael S. Tsirkin <mst@...hat.com>

Reviewed-by: Xuan Zhuo <xuanzhuo@...ux.alibaba.com>


> ---
>
> Especially important now that Jiri's patch for BQL has been merged.
> Lightly tested.
>
>  drivers/net/virtio_net.c | 6 ++++--
>  1 file changed, 4 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c
> index 283b34d50296..c2ce8de340f7 100644
> --- a/drivers/net/virtio_net.c
> +++ b/drivers/net/virtio_net.c
> @@ -383,6 +383,8 @@ static void __free_old_xmit(struct send_queue *sq, bool in_napi,
>  	unsigned int len;
>  	void *ptr;
>
> +	stats->bytes = stats->packets = 0;
> +
>  	while ((ptr = virtqueue_get_buf(sq->vq, &len)) != NULL) {
>  		++stats->packets;
>
> @@ -828,7 +830,7 @@ static void virtnet_rq_unmap_free_buf(struct virtqueue *vq, void *buf)
>
>  static void free_old_xmit(struct send_queue *sq, bool in_napi)
>  {
> -	struct virtnet_sq_free_stats stats = {0};
> +	struct virtnet_sq_free_stats stats;
>
>  	__free_old_xmit(sq, in_napi, &stats);
>
> @@ -979,7 +981,7 @@ static int virtnet_xdp_xmit(struct net_device *dev,
>  			    int n, struct xdp_frame **frames, u32 flags)
>  {
>  	struct virtnet_info *vi = netdev_priv(dev);
> -	struct virtnet_sq_free_stats stats = {0};
> +	struct virtnet_sq_free_stats stats;
>  	struct receive_queue *rq = vi->rq;
>  	struct bpf_prog *xdp_prog;
>  	struct send_queue *sq;
> --
> MST
>