[PATCH v7 7/9] vdpa: add new attribute VDPA_ATTR_DEV_MIN_VQ_SIZE

From: Wu Zongyong
Date: Fri Oct 29 2021 - 05:16:52 EST


This attribute advertises the min value of virtqueue size. The value is
1 by default.

Signed-off-by: Wu Zongyong <wuzongyong@xxxxxxxxxxxxxxxxx>
---
drivers/vdpa/vdpa.c | 5 +++++
include/uapi/linux/vdpa.h | 1 +
2 files changed, 6 insertions(+)

diff --git a/drivers/vdpa/vdpa.c b/drivers/vdpa/vdpa.c
index d783a943647d..fcf02a364878 100644
--- a/drivers/vdpa/vdpa.c
+++ b/drivers/vdpa/vdpa.c
@@ -500,6 +500,7 @@ vdpa_dev_fill(struct vdpa_device *vdev, struct sk_buff *msg, u32 portid, u32 seq
int flags, struct netlink_ext_ack *extack)
{
u16 max_vq_size;
+ u16 min_vq_size = 1;
u32 device_id;
u32 vendor_id;
void *hdr;
@@ -516,6 +517,8 @@ vdpa_dev_fill(struct vdpa_device *vdev, struct sk_buff *msg, u32 portid, u32 seq
device_id = vdev->config->get_device_id(vdev);
vendor_id = vdev->config->get_vendor_id(vdev);
max_vq_size = vdev->config->get_vq_num_max(vdev);
+ if (vdev->config->get_vq_num_min)
+ min_vq_size = vdev->config->get_vq_num_min(vdev);

err = -EMSGSIZE;
if (nla_put_string(msg, VDPA_ATTR_DEV_NAME, dev_name(&vdev->dev)))
@@ -528,6 +531,8 @@ vdpa_dev_fill(struct vdpa_device *vdev, struct sk_buff *msg, u32 portid, u32 seq
goto msg_err;
if (nla_put_u16(msg, VDPA_ATTR_DEV_MAX_VQ_SIZE, max_vq_size))
goto msg_err;
+ if (nla_put_u16(msg, VDPA_ATTR_DEV_MIN_VQ_SIZE, min_vq_size))
+ goto msg_err;

genlmsg_end(msg, hdr);
return 0;
diff --git a/include/uapi/linux/vdpa.h b/include/uapi/linux/vdpa.h
index 66a41e4ec163..e3b87879514c 100644
--- a/include/uapi/linux/vdpa.h
+++ b/include/uapi/linux/vdpa.h
@@ -32,6 +32,7 @@ enum vdpa_attr {
VDPA_ATTR_DEV_VENDOR_ID, /* u32 */
VDPA_ATTR_DEV_MAX_VQS, /* u32 */
VDPA_ATTR_DEV_MAX_VQ_SIZE, /* u16 */
+ VDPA_ATTR_DEV_MIN_VQ_SIZE, /* u16 */

/* new attributes must be added above here */
VDPA_ATTR_MAX,
--
2.31.1