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

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Message-Id: <20230412105034.178936-1-michael@walle.cc>
Date:   Wed, 12 Apr 2023 12:50:34 +0200
From:   Michael Walle <michael@...le.cc>
To:     kuba@...nel.org
Cc:     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, vladimir.oltean@....com,
        Michael Walle <michael@...le.cc>
Subject: Re: [PATCH net-next RFC v4 2/5] net: Expose available time stamping layers to user space.

>> +/* 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.

-michael