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Subject: Re: [PATCH v4 4/7] vdpa: add new callback get_vq_num_min in
 vdpa_config_ops
To:     Wu Zongyong <wuzongyong@linux.alibaba.com>,
        virtualization@lists.linux-foundation.org,
        linux-kernel@vger.kernel.org, mst@redhat.com
Cc:     wei.yang1@linux.alibaba.com
References: <cover.1632313398.git.wuzongyong@linux.alibaba.com>
 <cover.1632882380.git.wuzongyong@linux.alibaba.com>
 <451ce3c272ebd5d532db1ed19c2ab53c4609f7ad.1632882380.git.wuzongyong@linux.alibaba.com>
From:   Jason Wang <jasowang@redhat.com>
Message-ID: <a07c02e3-e5eb-ae94-33d9-26c29de484c9@redhat.com>
Date:   Mon, 11 Oct 2021 11:04:14 +0800
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?? 2021/9/29 ????2:11, Wu Zongyong д??:
> This callback is optional. For vdpa devices that not support to change
> virtqueue size, get_vq_num_min and get_vq_num_max will return the same
> value, so that users can choose a correct value for that device.
>
> Suggested-by: Jason Wang <jasowang@redhat.com>
> Signed-off-by: Wu Zongyong <wuzongyong@linux.alibaba.com>


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


> ---
>   include/linux/vdpa.h | 4 ++++
>   1 file changed, 4 insertions(+)
>
> diff --git a/include/linux/vdpa.h b/include/linux/vdpa.h
> index a896ee021e5f..30864848950b 100644
> --- a/include/linux/vdpa.h
> +++ b/include/linux/vdpa.h
> @@ -171,6 +171,9 @@ struct vdpa_map_file {
>    * @get_vq_num_max:		Get the max size of virtqueue
>    *				@vdev: vdpa device
>    *				Returns u16: max size of virtqueue
> + * @get_vq_num_min:		Get the min size of virtqueue (optional)
> + *				@vdev: vdpa device
> + *				Returns u16: min size of virtqueue
>    * @get_device_id:		Get virtio device id
>    *				@vdev: vdpa device
>    *				Returns u32: virtio device id
> @@ -266,6 +269,7 @@ struct vdpa_config_ops {
>   	void (*set_config_cb)(struct vdpa_device *vdev,
>   			      struct vdpa_callback *cb);
>   	u16 (*get_vq_num_max)(struct vdpa_device *vdev);
> +	u16 (*get_vq_num_min)(struct vdpa_device *vdev);
>   	u32 (*get_device_id)(struct vdpa_device *vdev);
>   	u32 (*get_vendor_id)(struct vdpa_device *vdev);
>   	u8 (*get_status)(struct vdpa_device *vdev);