On Fri, Jul 22, 2022 at 07:53:06PM +0800, Zhu Lingshan wrote:
> This commit adds a new vDPA netlink attribution
> VDPA_ATTR_VDPA_DEV_SUPPORTED_FEATURES. Userspace can query
> features of vDPA devices through this new attr.
>
> Signed-off-by: Zhu Lingshan <[email protected]>
I think at least some discussion and documentation
of this attribute versus VDPA_ATTR_DEV_SUPPORTED_FEATURES
is called for.
Otherwise how do people know which one to use?
We can't send everyone to go read the lkml thread.
> ---
> drivers/vdpa/vdpa.c | 13 +++++++++----
> include/uapi/linux/vdpa.h | 1 +
> 2 files changed, 10 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/vdpa/vdpa.c b/drivers/vdpa/vdpa.c
> index ebf2f363fbe7..9b0e39b2f022 100644
> --- a/drivers/vdpa/vdpa.c
> +++ b/drivers/vdpa/vdpa.c
> @@ -815,7 +815,7 @@ static int vdpa_dev_net_mq_config_fill(struct vdpa_device
> *vdev,
> static int vdpa_dev_net_config_fill(struct vdpa_device *vdev, struct sk_buff
> *msg)
> {
> struct virtio_net_config config = {};
> - u64 features;
> + u64 features_device, features_driver;
> u16 val_u16;
>
> vdpa_get_config_unlocked(vdev, 0, &config, sizeof(config));
> @@ -832,12 +832,17 @@ static int vdpa_dev_net_config_fill(struct vdpa_device
> *vdev, struct sk_buff *ms
> if (nla_put_u16(msg, VDPA_ATTR_DEV_NET_CFG_MTU, val_u16))
> return -EMSGSIZE;
>
> - features = vdev->config->get_driver_features(vdev);
> - if (nla_put_u64_64bit(msg, VDPA_ATTR_DEV_NEGOTIATED_FEATURES, features,
> + features_driver = vdev->config->get_driver_features(vdev);
> + if (nla_put_u64_64bit(msg, VDPA_ATTR_DEV_NEGOTIATED_FEATURES,
> features_driver,
> + VDPA_ATTR_PAD))
> + return -EMSGSIZE;
> +
> + features_device = vdev->config->get_device_features(vdev);
> + if (nla_put_u64_64bit(msg, VDPA_ATTR_VDPA_DEV_SUPPORTED_FEATURES,
> features_device,
> VDPA_ATTR_PAD))
> return -EMSGSIZE;
>
> - return vdpa_dev_net_mq_config_fill(vdev, msg, features, &config);
> + return vdpa_dev_net_mq_config_fill(vdev, msg, features_driver, &config);
> }
>
> static int
> diff --git a/include/uapi/linux/vdpa.h b/include/uapi/linux/vdpa.h
> index 25c55cab3d7c..39f1c3d7c112 100644
> --- a/include/uapi/linux/vdpa.h
> +++ b/include/uapi/linux/vdpa.h
> @@ -47,6 +47,7 @@ enum vdpa_attr {
> VDPA_ATTR_DEV_NEGOTIATED_FEATURES, /* u64 */
> VDPA_ATTR_DEV_MGMTDEV_MAX_VQS, /* u32 */
> VDPA_ATTR_DEV_SUPPORTED_FEATURES, /* u64 */
> + VDPA_ATTR_VDPA_DEV_SUPPORTED_FEATURES, /* u64 */
>
> VDPA_ATTR_DEV_QUEUE_INDEX, /* u32 */
> VDPA_ATTR_DEV_VENDOR_ATTR_NAME, /* string */
> --
> 2.31.1
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