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Message-ID: <1718782933.7258735-3-hengqi@linux.alibaba.com>
Date: Wed, 19 Jun 2024 15:42:13 +0800
From: Heng Qi <hengqi@...ux.alibaba.com>
To: Li RongQing <lirongqing@...du.com>
Cc: Li RongQing <lirongqing@...du.com>,
mst@...hat.com,
jasowang@...hat.com,
xuanzhuo@...ux.alibaba.com,
eperezma@...hat.com,
virtualization@...ts.linux.dev,
netdev@...r.kernel.org
Subject: Re: [PATCH] virtio_net: Use u64_stats_fetch_begin() for stats fetch
On Wed, 19 Jun 2024 10:55:29 +0800, Li RongQing <lirongqing@...du.com> wrote:
> This place is fetching the stats, so u64_stats_fetch_begin
> and u64_stats_fetch_retry should be used
Reviewed-by: Heng Qi <hengqi@...ux.alibaba.com>
Thanks!
>
> Fixes: 6208799553a8 ("virtio-net: support rx netdim")
> Signed-off-by: Li RongQing <lirongqing@...du.com>
> ---
> drivers/net/virtio_net.c | 14 ++++++++------
> 1 file changed, 8 insertions(+), 6 deletions(-)
>
> diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c
> index 61a57d1..b669e73 100644
> --- a/drivers/net/virtio_net.c
> +++ b/drivers/net/virtio_net.c
> @@ -2332,16 +2332,18 @@ static void virtnet_poll_cleantx(struct receive_queue *rq)
> static void virtnet_rx_dim_update(struct virtnet_info *vi, struct receive_queue *rq)
> {
> struct dim_sample cur_sample = {};
> + unsigned int start;
>
> if (!rq->packets_in_napi)
> return;
>
> - u64_stats_update_begin(&rq->stats.syncp);
> - dim_update_sample(rq->calls,
> - u64_stats_read(&rq->stats.packets),
> - u64_stats_read(&rq->stats.bytes),
> - &cur_sample);
> - u64_stats_update_end(&rq->stats.syncp);
> + do {
> + start = u64_stats_fetch_begin(&rq->stats.syncp);
> + dim_update_sample(rq->calls,
> + u64_stats_read(&rq->stats.packets),
> + u64_stats_read(&rq->stats.bytes),
> + &cur_sample);
> + } while (u64_stats_fetch_retry(&rq->stats.syncp, start));
>
> net_dim(&rq->dim, cur_sample);
> rq->packets_in_napi = 0;
> --
> 2.9.4
>
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