[PATCH 14/21] vhost-vdpa: uAPI to get virtqueue group id

From: Jason Wang
Date: Wed Dec 16 2020 - 01:52:06 EST


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 | 8 ++++++++
2 files changed, 16 insertions(+)

diff --git a/drivers/vhost/vdpa.c b/drivers/vhost/vdpa.c
index bff8aa214f78..e7023abda12c 100644
--- a/drivers/vhost/vdpa.c
+++ b/drivers/vhost/vdpa.c
@@ -442,6 +442,14 @@ 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 8762911a3cb8..99de06476fdc 100644
--- a/include/uapi/linux/vhost.h
+++ b/include/uapi/linux/vhost.h
@@ -150,4 +150,12 @@

/* Get the number of address spaces. */
#define VHOST_VDPA_GET_AS_NUM _IOR(VHOST_VIRTIO, 0x7A, unsigned int)
+
+/* Get the group for a virtqueue: read index, write group in num,
+ * The virtqueue index is stored in the index field of
+ * vhost_vring_state. The group for this specific virtqueue is
+ * returned via num field of vhost_vring_state.
+ */
+#define VHOST_VDPA_GET_VRING_GROUP _IOWR(VHOST_VIRTIO, 0x7B, \
+ struct vhost_vring_state)
#endif
--
2.25.1