[RFC PATCH 16/24] vhost-vdpa: uAPI to get virtqueue group id

[Jason Wang]

Follows the support for virtqueue group in vDPA. This patches
introduces uAPI to get the virtqueue group ID for a specific virtqueue
in vhost-vdpa.

Signed-off-by: Jason Wang <jasowang@xxxxxxxxxx>
---
 drivers/vhost/vdpa.c       | 8 ++++++++
 include/uapi/linux/vhost.h | 4 ++++
 2 files changed, 12 insertions(+)

diff --git a/drivers/vhost/vdpa.c b/drivers/vhost/vdpa.c
index 4d97a59824a1..a234d3783e16 100644
--- a/drivers/vhost/vdpa.c
+++ b/drivers/vhost/vdpa.c
@@ -433,6 +433,14 @@ static long vhost_vdpa_vring_ioctl(struct vhost_vdpa *v, unsigned int cmd,
 			return -EFAULT;
 		ops->set_vq_ready(vdpa, idx, s.num);
 		return 0;
+	case VHOST_VDPA_GET_VRING_GROUP:
+		s.index = idx;
+		s.num = ops->get_vq_group(vdpa, idx);
+		if (s.num >= vdpa->ngroups)
+			return -EIO;
+		else if (copy_to_user(argp, &s, sizeof s))
+			return -EFAULT;
+		return 0;
 	case VHOST_GET_VRING_BASE:
 		r = ops->get_vq_state(v->vdpa, idx, &vq_state);
 		if (r)
diff --git a/include/uapi/linux/vhost.h b/include/uapi/linux/vhost.h
index 99bdf50efc50..d1c4b5561fee 100644
--- a/include/uapi/linux/vhost.h
+++ b/include/uapi/linux/vhost.h
@@ -147,4 +147,8 @@
 
 /* Get the number of address spaces. */
 #define VHOST_VDPA_GET_AS_NUM		_IOR(VHOST_VIRTIO, 0x79, unsigned int)
+
+/* Get the group for a virtqueue: read index, write group in num */
+#define VHOST_VDPA_GET_VRING_GROUP	_IOWR(VHOST_VIRTIO, 0x79,	\
+					      struct vhost_vring_state)
 #endif
-- 
2.20.1