netdev - Re: [PATCH net-next RFC v4 2/5] net: Expose available time stamping layers to user space.

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Date:   Wed, 12 Apr 2023 14:08:40 +0300
From:   Vladimir Oltean <vladimir.oltean@....com>
To:     Michael Walle <michael@...le.cc>
Cc:     kuba@...nel.org, gerhard@...leder-embedded.com, glipus@...il.com,
        kory.maincent@...tlin.com, krzysztof.kozlowski+dt@...aro.org,
        linux@...linux.org.uk, maxime.chevallier@...tlin.com,
        netdev@...r.kernel.org, richardcochran@...il.com,
        robh+dt@...nel.org, thomas.petazzoni@...tlin.com,
        vadim.fedorenko@...ux.dev
Subject: Re: [PATCH net-next RFC v4 2/5] net: Expose available time stamping
 layers to user space.

On Wed, Apr 12, 2023 at 12:50:34PM +0200, Michael Walle wrote:
> >> +/* Hardware layer of the SO_TIMESTAMPING provider */
> >> +enum timestamping_layer {
> >> +	SOF_MAC_TIMESTAMPING =3D (1<<0),
> >> +	SOF_PHY_TIMESTAMPING =3D (1<<1),
> >
> > What does SOF_ stand for?
> 
> I'd guess start of frame. The timestamp will be taken at the
> beginning of the frame.

I would suggest (with all due respect) that it was an inapt adaptation
of the Socket Option Flags that can be seen in
Documentation/networking/timestamping.rst.

These are not socket option flags (because these settings are not per
socket), so the namespace/prefix is not really correctly used here.