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    Subject[PATCH v7 7/9] vdpa: add new attribute VDPA_ATTR_DEV_MIN_VQ_SIZE
    Date
    This attribute advertises the min value of virtqueue size. The value is
    1 by default.

    Signed-off-by: Wu Zongyong <wuzongyong@linux.alibaba.com>
    ---
    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
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