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Subject[RFC PATCH 16/24] vhost-vdpa: uAPI to get virtqueue group id
Date
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@redhat.com>
---
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
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