netdev - Re: [PATCH net v3 1/2] virtio_net: fix possible dim status unrecoverable

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Date: Thu, 30 May 2024 17:57:17 +0800
From: Xuan Zhuo <xuanzhuo@...ux.alibaba.com>
To: Heng Qi <hengqi@...ux.alibaba.com>
Cc: Jason Wang <jasowang@...hat.com>,
 "Michael S. Tsirkin" <mst@...hat.com>,
 "David S. Miller" <davem@...emloft.net>,
 Eric Dumazet <edumazet@...gle.com>,
 Jakub Kicinski <kuba@...nel.org>,
 Paolo Abeni <pabeni@...hat.com>,
 Jiri Pirko <jiri@...nulli.us>,
 Daniel Jurgens <danielj@...dia.com>,
 Jiri Pirko <jiri@...dia.com>,
 netdev@...r.kernel.org,
 virtualization@...ts.linux.dev
Subject: Re: [PATCH net v3 1/2] virtio_net: fix possible dim status unrecoverable

On Tue, 28 May 2024 21:41:15 +0800, Heng Qi <hengqi@...ux.alibaba.com> wrote:
> When the dim worker is scheduled, if it no longer needs to issue
> commands, dim may not be able to return to the working state later.
>
> For example, the following single queue scenario:
>   1. The dim worker of rxq0 is scheduled, and the dim status is
>      changed to DIM_APPLY_NEW_PROFILE;
>   2. dim is disabled or parameters have not been modified;
>   3. virtnet_rx_dim_work exits directly;
>
> Then, even if net_dim is invoked again, it cannot work because the
> state is not restored to DIM_START_MEASURE.
>
> Fixes: 6208799553a8 ("virtio-net: support rx netdim")
> Signed-off-by: Heng Qi <hengqi@...ux.alibaba.com>
> Reviewed-by: Jiri Pirko <jiri@...dia.com>

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

> ---
>  drivers/net/virtio_net.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c
> index 4a802c0ea2cb..4f828a9e5889 100644
> --- a/drivers/net/virtio_net.c
> +++ b/drivers/net/virtio_net.c
> @@ -4417,9 +4417,9 @@ static void virtnet_rx_dim_work(struct work_struct *work)
>  		if (err)
>  			pr_debug("%s: Failed to send dim parameters on rxq%d\n",
>  				 dev->name, qnum);
> -		dim->state = DIM_START_MEASURE;
>  	}
>  out:
> +	dim->state = DIM_START_MEASURE;
>  	mutex_unlock(&rq->dim_lock);
>  }
>
> --
> 2.32.0.3.g01195cf9f
>