Re: [PATCH v2 3/3] vdpa: support exposing the count of vqs to userspace

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On Tue, Mar 15, 2022 at 11:25:53AM +0800, Longpeng(Mike) wrote:
From: Longpeng <longpeng2@xxxxxxxxxx>

- GET_VQS_COUNT: the count of virtqueues that exposed

Signed-off-by: Longpeng <longpeng2@xxxxxxxxxx>
---
drivers/vhost/vdpa.c       | 13 +++++++++++++
include/uapi/linux/vhost.h |  3 +++
2 files changed, 16 insertions(+)

diff --git a/drivers/vhost/vdpa.c b/drivers/vhost/vdpa.c
index 0c82eb5..69b3f05 100644
--- a/drivers/vhost/vdpa.c
+++ b/drivers/vhost/vdpa.c
@@ -370,6 +370,16 @@ static long vhost_vdpa_get_config_size(struct vhost_vdpa *v, u32 __user *argp)
	return 0;
}

+static long vhost_vdpa_get_vqs_count(struct vhost_vdpa *v, u32 __user *argp)
+{
+	struct vdpa_device *vdpa = v->vdpa;
+
+	if (copy_to_user(argp, &vdpa->nvqs, sizeof(vdpa->nvqs)))
+		return -EFAULT;
+
+	return 0;
+}
+
static long vhost_vdpa_vring_ioctl(struct vhost_vdpa *v, unsigned int cmd,
				   void __user *argp)
{
@@ -510,6 +520,9 @@ static long vhost_vdpa_unlocked_ioctl(struct file *filep,
	case VHOST_VDPA_GET_CONFIG_SIZE:
		r = vhost_vdpa_get_config_size(v, argp);
		break;
+	case VHOST_VDPA_GET_VQS_COUNT:
+		r = vhost_vdpa_get_vqs_count(v, argp);
+		break;
	default:
		r = vhost_dev_ioctl(&v->vdev, cmd, argp);
		if (r == -ENOIOCTLCMD)
diff --git a/include/uapi/linux/vhost.h b/include/uapi/linux/vhost.h
index bc74e95..5d99e7c 100644
--- a/include/uapi/linux/vhost.h
+++ b/include/uapi/linux/vhost.h
@@ -154,4 +154,7 @@
/* 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)

I'd prefer VHOST_VDPA_GET_NUM_QUEUES, since we use "num_queues" also in the spec [1].

But I'm fine also with this:

Reviewed-by: Stefano Garzarella <sgarzare@xxxxxxxxxx>

[1] https://docs.oasis-open.org/virtio/virtio/v1.1/csprd01/virtio-v1.1-csprd01.html#x1-1120003

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