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vdpa: add new callback get_vq_num_min in vdpa_config_ops
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> Link: https://lore.kernel.org/r/f4af5b0abd660d9a29ab6b2f67bd6df10284a230.1635493219.git.wuzongyong@linux.alibaba.com Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
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@ -171,6 +171,9 @@ struct vdpa_map_file {
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* @get_vq_num_max: Get the max size of virtqueue
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* @vdev: vdpa device
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* Returns u16: max size of virtqueue
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* @get_vq_num_min: Get the min size of virtqueue (optional)
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* @vdev: vdpa device
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* Returns u16: min size of virtqueue
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* @get_device_id: Get virtio device id
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* @vdev: vdpa device
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* Returns u32: virtio device id
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@ -266,6 +269,7 @@ struct vdpa_config_ops {
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void (*set_config_cb)(struct vdpa_device *vdev,
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struct vdpa_callback *cb);
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u16 (*get_vq_num_max)(struct vdpa_device *vdev);
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u16 (*get_vq_num_min)(struct vdpa_device *vdev);
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u32 (*get_device_id)(struct vdpa_device *vdev);
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u32 (*get_vendor_id)(struct vdpa_device *vdev);
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u8 (*get_status)(struct vdpa_device *vdev);
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