netdev - Re: [PATCH 1/2] vdpa/mlx5: Avoid unnecessary query virtqueue

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Date:   Fri, 29 Jan 2021 11:48:19 +0800
From:   Jason Wang <jasowang@...hat.com>
To:     Eli Cohen <elic@...dia.com>, mst@...hat.com
Cc:     virtualization@...ts.linux-foundation.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, lulu@...hat.com
Subject: Re: [PATCH 1/2] vdpa/mlx5: Avoid unnecessary query virtqueue


On 2021/1/28 下午9:41, Eli Cohen wrote:
> suspend_vq should only suspend the VQ on not save the current available
> index. This is done when a change of map occurs when the driver calls
> save_channel_info().
>
> Signed-off-by: Eli Cohen <elic@...dia.com>


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


> ---
>   drivers/vdpa/mlx5/net/mlx5_vnet.c | 8 --------
>   1 file changed, 8 deletions(-)
>
> diff --git a/drivers/vdpa/mlx5/net/mlx5_vnet.c b/drivers/vdpa/mlx5/net/mlx5_vnet.c
> index 88dde3455bfd..549ded074ff3 100644
> --- a/drivers/vdpa/mlx5/net/mlx5_vnet.c
> +++ b/drivers/vdpa/mlx5/net/mlx5_vnet.c
> @@ -1148,8 +1148,6 @@ static int setup_vq(struct mlx5_vdpa_net *ndev, struct mlx5_vdpa_virtqueue *mvq)
>   
>   static void suspend_vq(struct mlx5_vdpa_net *ndev, struct mlx5_vdpa_virtqueue *mvq)
>   {
> -	struct mlx5_virtq_attr attr;
> -
>   	if (!mvq->initialized)
>   		return;
>   
> @@ -1158,12 +1156,6 @@ static void suspend_vq(struct mlx5_vdpa_net *ndev, struct mlx5_vdpa_virtqueue *m
>   
>   	if (modify_virtqueue(ndev, mvq, MLX5_VIRTIO_NET_Q_OBJECT_STATE_SUSPEND))
>   		mlx5_vdpa_warn(&ndev->mvdev, "modify to suspend failed\n");
> -
> -	if (query_virtqueue(ndev, mvq, &attr)) {
> -		mlx5_vdpa_warn(&ndev->mvdev, "failed to query virtqueue\n");
> -		return;
> -	}
> -	mvq->avail_idx = attr.available_index;
>   }
>   
>   static void suspend_vqs(struct mlx5_vdpa_net *ndev)