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

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Date:   Tue, 15 Feb 2022 16:46:42 +0200
From:   Eli Cohen <elic@...dia.com>
To:     Si-Wei Liu <si-wei.liu@...cle.com>
CC:     <stephen@...workplumber.org>, <netdev@...r.kernel.org>,
        <jasowang@...hat.com>, <lulu@...hat.com>
Subject: Re: [PATCH v1 4/4] vdpa: Support reading device features

On Fri, Feb 11, 2022 at 04:43:08PM -0800, Si-Wei Liu wrote:
> 
> 
> 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.
> 
Will add

> 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);
> >   }
>