netdev - [PATCH v2 11/19] vhost-vdpa: introduce uAPI to get the number of virtqueue groups

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Date:   Wed, 30 Mar 2022 23:33:51 +0530
From:   Gautam Dawar <gautam.dawar@...inx.com>
To:     "Michael S. Tsirkin" <mst@...hat.com>,
        Jason Wang <jasowang@...hat.com>, <kvm@...r.kernel.org>,
        <virtualization@...ts.linux-foundation.org>,
        <netdev@...r.kernel.org>, <linux-kernel@...r.kernel.org>
CC:     <martinh@...inx.com>, <hanand@...inx.com>, <martinpo@...inx.com>,
        <pabloc@...inx.com>, <dinang@...inx.com>, <tanuj.kamde@....com>,
        <habetsm.xilinx@...il.com>, <ecree.xilinx@...il.com>,
        <eperezma@...hat.com>, Gautam Dawar <gdawar@...inx.com>,
        Wu Zongyong <wuzongyong@...ux.alibaba.com>,
        Christophe JAILLET <christophe.jaillet@...adoo.fr>,
        Eli Cohen <elic@...dia.com>,
        Zhu Lingshan <lingshan.zhu@...el.com>,
        Stefano Garzarella <sgarzare@...hat.com>,
        Xie Yongji <xieyongji@...edance.com>,
        Si-Wei Liu <si-wei.liu@...cle.com>,
        Parav Pandit <parav@...dia.com>,
        Longpeng <longpeng2@...wei.com>,
        Dan Carpenter <dan.carpenter@...cle.com>,
        Zhang Min <zhang.min9@....com.cn>
Subject: [PATCH v2 11/19] vhost-vdpa: introduce uAPI to get the number of virtqueue groups

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@...hat.com>
Signed-off-by: Gautam Dawar <gdawar@...inx.com>
---
 drivers/vhost/vdpa.c       | 4 ++++
 include/uapi/linux/vhost.h | 4 +++-
 2 files changed, 7 insertions(+), 1 deletion(-)

diff --git a/drivers/vhost/vdpa.c b/drivers/vhost/vdpa.c
index cd1bee536c46..92f78df0f685 100644
--- a/drivers/vhost/vdpa.c
+++ b/drivers/vhost/vdpa.c
@@ -559,6 +559,10 @@ 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 8f7b4a95d6f9..61317c61d768 100644
--- a/include/uapi/linux/vhost.h
+++ b/include/uapi/linux/vhost.h
@@ -145,11 +145,13 @@
 /* Get the valid iova range */
 #define VHOST_VDPA_GET_IOVA_RANGE	_IOR(VHOST_VIRTIO, 0x78, \
 					     struct vhost_vdpa_iova_range)
-
 /* Get the config size */
 #define VHOST_VDPA_GET_CONFIG_SIZE	_IOR(VHOST_VIRTIO, 0x79, __u32)
 
 /* Get the count of all virtqueues */
 #define VHOST_VDPA_GET_VQS_COUNT	_IOR(VHOST_VIRTIO, 0x80, __u32)
 
+/* Get the number of virtqueue groups. */
+#define VHOST_VDPA_GET_GROUP_NUM	_IOR(VHOST_VIRTIO, 0x81, __u32)
+
 #endif
-- 
2.30.1