linux-kernel - Re: [PATCH] vdpa: merge functionally duplicated dev

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Date:   Wed, 12 Oct 2022 11:07:48 +0800
From:   Jason Wang <jasowang@...hat.com>
To:     Si-Wei Liu <si-wei.liu@...cle.com>
Cc:     mst@...hat.com, virtualization@...ts.linux-foundation.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] vdpa: merge functionally duplicated dev_features attributes

On Tue, Oct 11, 2022 at 2:32 AM Si-Wei Liu <si-wei.liu@...cle.com> wrote:
>
> We can merge VDPA_ATTR_VDPA_DEV_SUPPORTED_FEATURES with
> VDPA_ATTR_DEV_FEATURES which is functionally equivalent.
> While at it, tweak the comment in header file to make
> user provioned device features distinguished from those
> supported by the parent mgmtdev device: the former of
> which can be inherited as a whole from the latter, or
> can be a subset of the latter if explicitly specified.
>
> Signed-off-by: Si-Wei Liu <si-wei.liu@...cle.com>

Acked-by: Jason Wang <jasowang@...hat.com>

> ---
>  drivers/vdpa/vdpa.c       | 2 +-
>  include/uapi/linux/vdpa.h | 4 +---
>  2 files changed, 2 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/vdpa/vdpa.c b/drivers/vdpa/vdpa.c
> index febdc99..41ed563 100644
> --- a/drivers/vdpa/vdpa.c
> +++ b/drivers/vdpa/vdpa.c
> @@ -855,7 +855,7 @@ static int vdpa_dev_net_config_fill(struct vdpa_device *vdev, struct sk_buff *ms
>
>         features_device = vdev->config->get_device_features(vdev);
>
> -       if (nla_put_u64_64bit(msg, VDPA_ATTR_VDPA_DEV_SUPPORTED_FEATURES, features_device,
> +       if (nla_put_u64_64bit(msg, VDPA_ATTR_DEV_FEATURES, features_device,
>                               VDPA_ATTR_PAD))
>                 return -EMSGSIZE;
>
> diff --git a/include/uapi/linux/vdpa.h b/include/uapi/linux/vdpa.h
> index 9bd7923..54b649a 100644
> --- a/include/uapi/linux/vdpa.h
> +++ b/include/uapi/linux/vdpa.h
> @@ -53,11 +53,9 @@ enum vdpa_attr {
>         VDPA_ATTR_DEV_VENDOR_ATTR_NAME,         /* string */
>         VDPA_ATTR_DEV_VENDOR_ATTR_VALUE,        /* u64 */
>
> +       /* virtio features that are provisioned to the vDPA device */
>         VDPA_ATTR_DEV_FEATURES,                 /* u64 */
>
> -       /* virtio features that are supported by the vDPA device */
> -       VDPA_ATTR_VDPA_DEV_SUPPORTED_FEATURES,  /* u64 */
> -
>         /* new attributes must be added above here */
>         VDPA_ATTR_MAX,
>  };
> --
> 1.8.3.1
>