On Fri, Oct 22, 2021 at 10:44 AM Wu Zongyong
<wuzongyong@xxxxxxxxxxxxxxxxx> wrote:
>
> 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@xxxxxxxxxx>
> Signed-off-by: Wu Zongyong <wuzongyong@xxxxxxxxxxxxxxxxx>
Acked-by: Jason Wang <jasowang@xxxxxxxxxx>
> ---
> 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);
> --
> 2.31.1
>
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