diff mbox series

[RFC,14/24] vhost-vdpa: introduce uAPI to get the number of virtqueue groups

Message ID 20200924032125.18619-15-jasowang@redhat.com
State RFC
Delegated to: David Miller
Headers show
Series Control VQ support in vDPA | expand

Commit Message

Jason Wang Sept. 24, 2020, 3:21 a.m. UTC 
Follows the vDPA support for multiple address spaces, this patch
introduce uAPI for the userspace to know the number of virtqueue
groups supported by the vDPA device.

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

Patch

diff --git a/drivers/vhost/vdpa.c b/drivers/vhost/vdpa.c
index 1ba7e95619b5..4b8882f55bc9 100644
--- a/drivers/vhost/vdpa.c
+++ b/drivers/vhost/vdpa.c
@@ -528,6 +528,10 @@  static long vhost_vdpa_unlocked_ioctl(struct file *filep,
 	case VHOST_VDPA_GET_VRING_NUM:
 		r = vhost_vdpa_get_vring_num(v, argp);
 		break;
+	case VHOST_VDPA_GET_GROUP_NUM:
+		r = copy_to_user(argp, &v->vdpa->ngroups,
+				 sizeof(v->vdpa->ngroups));
+		break;
 	case VHOST_SET_LOG_BASE:
 	case VHOST_SET_LOG_FD:
 		r = -ENOIOCTLCMD;
diff --git a/include/uapi/linux/vhost.h b/include/uapi/linux/vhost.h
index c26452782882..19f1acdfe3ea 100644
--- a/include/uapi/linux/vhost.h
+++ b/include/uapi/linux/vhost.h
@@ -141,4 +141,8 @@ 
 
 /* Set event fd for config interrupt*/
 #define VHOST_VDPA_SET_CONFIG_CALL	_IOW(VHOST_VIRTIO, 0x77, int)
+
+/* Get the number of virtqueue groups. */
+#define VHOST_VDPA_GET_GROUP_NUM	_IOR(VHOST_VIRTIO, 0x78, unsigned int)
+
 #endif