Re: [PATCH v4 3/6] vdpa/mlx5: Decouple virtqueue callback from struct mlx5_vdpa_virtqueue

[Jason Wang <jasowang@redhat.com>]

在 2021/8/23 下午1:21, Eli Cohen 写道:
> Instead, define an array of struct vdpa_callback on struct mlx5_vdpa_net
> and use it to store callbacks for any virtqueue provided. This is
> required due to the fact that callback configurations arrive before feature
> negotiation. With control VQ and multiqueue introduced next we want to
> save the information until after feature negotiation where we know the
> CVQ index.
>
> Signed-off-by: Eli Cohen <elic@nvidia.com>


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


> ---
>   drivers/vdpa/mlx5/net/mlx5_vnet.c | 17 +++++++++--------
>   1 file changed, 9 insertions(+), 8 deletions(-)
>
> diff --git a/drivers/vdpa/mlx5/net/mlx5_vnet.c b/drivers/vdpa/mlx5/net/mlx5_vnet.c
> index 245c859ca5ae..3ae2e5ae2be1 100644
> --- a/drivers/vdpa/mlx5/net/mlx5_vnet.c
> +++ b/drivers/vdpa/mlx5/net/mlx5_vnet.c
> @@ -90,7 +90,6 @@ struct mlx5_vq_restore_info {
>   	u16 avail_index;
>   	u16 used_index;
>   	bool ready;
> -	struct vdpa_callback cb;
>   	bool restore;
>   };
>   
> @@ -100,7 +99,6 @@ struct mlx5_vdpa_virtqueue {
>   	u64 device_addr;
>   	u64 driver_addr;
>   	u32 num_ent;
> -	struct vdpa_callback event_cb;
>   
>   	/* Resources for implementing the notification channel from the device
>   	 * to the driver. fwqp is the firmware end of an RC connection; the
> @@ -140,6 +138,7 @@ struct mlx5_vdpa_net {
>   	struct mlx5_vdpa_net_resources res;
>   	struct virtio_net_config config;
>   	struct mlx5_vdpa_virtqueue vqs[MLX5_MAX_SUPPORTED_VQS];
> +	struct vdpa_callback event_cbs[MLX5_MAX_SUPPORTED_VQS + 1];
>   
>   	/* Serialize vq resources creation and destruction. This is required
>   	 * since memory map might change and we need to destroy and create
> @@ -481,6 +480,10 @@ static int mlx5_vdpa_poll_one(struct mlx5_vdpa_cq *vcq)
>   
>   static void mlx5_vdpa_handle_completions(struct mlx5_vdpa_virtqueue *mvq, int num)
>   {
> +	struct mlx5_vdpa_net *ndev = mvq->ndev;
> +	struct vdpa_callback *event_cb;
> +
> +	event_cb = &ndev->event_cbs[mvq->index];
>   	mlx5_cq_set_ci(&mvq->cq.mcq);
>   
>   	/* make sure CQ cosumer update is visible to the hardware before updating
> @@ -488,8 +491,8 @@ static void mlx5_vdpa_handle_completions(struct mlx5_vdpa_virtqueue *mvq, int nu
>   	 */
>   	dma_wmb();
>   	rx_post(&mvq->vqqp, num);
> -	if (mvq->event_cb.callback)
> -		mvq->event_cb.callback(mvq->event_cb.private);
> +	if (event_cb->callback)
> +		event_cb->callback(event_cb->private);
>   }
>   
>   static void mlx5_vdpa_cq_comp(struct mlx5_core_cq *mcq, struct mlx5_eqe *eqe)
> @@ -1384,9 +1387,8 @@ static void mlx5_vdpa_set_vq_cb(struct vdpa_device *vdev, u16 idx, struct vdpa_c
>   {
>   	struct mlx5_vdpa_dev *mvdev = to_mvdev(vdev);
>   	struct mlx5_vdpa_net *ndev = to_mlx5_vdpa_ndev(mvdev);
> -	struct mlx5_vdpa_virtqueue *vq = &ndev->vqs[idx];
>   
> -	vq->event_cb = *cb;
> +	ndev->event_cbs[idx] = *cb;
>   }
>   
>   static void mlx5_vdpa_set_vq_ready(struct vdpa_device *vdev, u16 idx, bool ready)
> @@ -1623,7 +1625,6 @@ static int save_channel_info(struct mlx5_vdpa_net *ndev, struct mlx5_vdpa_virtqu
>   	ri->desc_addr = mvq->desc_addr;
>   	ri->device_addr = mvq->device_addr;
>   	ri->driver_addr = mvq->driver_addr;
> -	ri->cb = mvq->event_cb;
>   	ri->restore = true;
>   	return 0;
>   }
> @@ -1668,7 +1669,6 @@ static void restore_channels_info(struct mlx5_vdpa_net *ndev)
>   		mvq->desc_addr = ri->desc_addr;
>   		mvq->device_addr = ri->device_addr;
>   		mvq->driver_addr = ri->driver_addr;
> -		mvq->event_cb = ri->cb;
>   	}
>   }
>   
> @@ -1791,6 +1791,7 @@ static void mlx5_vdpa_set_status(struct vdpa_device *vdev, u8 status)
>   		mlx5_vdpa_destroy_mr(&ndev->mvdev);
>   		ndev->mvdev.status = 0;
>   		ndev->mvdev.mlx_features = 0;
> +		memset(ndev->event_cbs, 0, sizeof(ndev->event_cbs));
>   		++mvdev->generation;
>   		if (MLX5_CAP_GEN(mvdev->mdev, umem_uid_0)) {
>   			if (mlx5_vdpa_create_mr(mvdev, NULL))

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