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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>
This commit is contained in:
Wu Zongyong 2021-10-29 17:14:45 +08:00 committed by Michael S. Tsirkin
parent 5bbfea1eac
commit 3b970a5842
1 changed files with 4 additions and 0 deletions
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4
include/linux/vdpa.h
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@ -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);