netdev - Re: [PATCH v1 4/4] vdpa: Support reading device features

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Date:   Fri, 11 Feb 2022 16:43:08 -0800
From:   Si-Wei Liu <si-wei.liu@...cle.com>
To:     Eli Cohen <elic@...dia.com>, stephen@...workplumber.org,
        netdev@...r.kernel.org
Cc:     jasowang@...hat.com, lulu@...hat.com
Subject: Re: [PATCH v1 4/4] vdpa: Support reading device features



On 2/10/2022 5:31 AM, Eli Cohen wrote:
> When showing the available management devices, check if
> VDPA_ATTR_DEV_SUPPORTED_FEATURES feature is available and print the
> supported features for a management device.
>
> Example:
> $ vdpa mgmtdev show
> auxiliary/mlx5_core.sf.1:
>    supported_classes net
>    max_supported_vqs 257
>    dev_features CSUM GUEST_CSUM MTU HOST_TSO4 HOST_TSO6 STATUS CTRL_VQ MQ \
>                 CTRL_MAC_ADDR VERSION_1 ACCESS_PLATFORM
It'd be nice to add an example output for json pretty format.

Reviewed-by: Si-Wei Liu <si-wei.liu@...cle.com>

>
> Signed-off-by: Eli Cohen <elic@...dia.com>
> ---
>   vdpa/include/uapi/linux/vdpa.h |  1 +
>   vdpa/vdpa.c                    | 11 +++++++++++
>   2 files changed, 12 insertions(+)
>
> diff --git a/vdpa/include/uapi/linux/vdpa.h b/vdpa/include/uapi/linux/vdpa.h
> index a3ebf4d4d9b8..96ccbf305d14 100644
> --- a/vdpa/include/uapi/linux/vdpa.h
> +++ b/vdpa/include/uapi/linux/vdpa.h
> @@ -42,6 +42,7 @@ enum vdpa_attr {
>   
>   	VDPA_ATTR_DEV_NEGOTIATED_FEATURES,	/* u64 */
>   	VDPA_ATTR_DEV_MGMTDEV_MAX_VQS,          /* u32 */
> +	VDPA_ATTR_DEV_SUPPORTED_FEATURES,	/* u64 */
>   
>   	/* new attributes must be added above here */
>   	VDPA_ATTR_MAX,
> diff --git a/vdpa/vdpa.c b/vdpa/vdpa.c
> index 99ee828630cc..44b2a3e9e78a 100644
> --- a/vdpa/vdpa.c
> +++ b/vdpa/vdpa.c
> @@ -83,6 +83,7 @@ static const enum mnl_attr_data_type vdpa_policy[VDPA_ATTR_MAX + 1] = {
>   	[VDPA_ATTR_DEV_MAX_VQ_SIZE] = MNL_TYPE_U16,
>   	[VDPA_ATTR_DEV_NEGOTIATED_FEATURES] = MNL_TYPE_U64,
>   	[VDPA_ATTR_DEV_MGMTDEV_MAX_VQS] = MNL_TYPE_U32,
> +	[VDPA_ATTR_DEV_SUPPORTED_FEATURES] = MNL_TYPE_U64,
>   };
>   
>   static int attr_cb(const struct nlattr *attr, void *data)
> @@ -535,6 +536,16 @@ static void pr_out_mgmtdev_show(struct vdpa *vdpa, const struct nlmsghdr *nlh,
>   		print_uint(PRINT_ANY, "max_supported_vqs", "  max_supported_vqs %d", num_vqs);
>   	}
>   
> +	if (tb[VDPA_ATTR_DEV_SUPPORTED_FEATURES]) {
> +		uint64_t features;
> +
> +		features  = mnl_attr_get_u64(tb[VDPA_ATTR_DEV_SUPPORTED_FEATURES]);
> +		if (classes & BIT(VIRTIO_ID_NET))
> +			print_net_features(vdpa, features, true);
> +		else
> +			print_generic_features(vdpa, features, true);
> +	}
> +
>   	pr_out_handle_end(vdpa);
>   }
>