netdev - Re: [PATCH v1 4/8] net: dsa: hellcreek: Add support for hardware timestamping

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Date:   Mon, 13 Jul 2020 17:12:17 +0300
From:   Vladimir Oltean <olteanv@...il.com>
To:     Richard Cochran <richardcochran@...il.com>
Cc:     Kurt Kanzenbach <kurt@...utronix.de>, Andrew Lunn <andrew@...n.ch>,
        Vivien Didelot <vivien.didelot@...il.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>, netdev@...r.kernel.org,
        Rob Herring <robh+dt@...nel.org>, devicetree@...r.kernel.org,
        Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
        Kamil Alkhouri <kamil.alkhouri@...offenburg.de>,
        ilias.apalodimas@...aro.org
Subject: Re: [PATCH v1 4/8] net: dsa: hellcreek: Add support for hardware
 timestamping

On Mon, Jul 13, 2020 at 07:01:12AM -0700, Richard Cochran wrote:
> On Mon, Jul 13, 2020 at 12:57:34PM +0200, Kurt Kanzenbach wrote:
> > > I would like to get some clarification on whether "SKBTX_IN_PROGRESS"
> > > should be set in shtx->tx_flags or not. On one hand, it's asking for
> > > trouble, on the other hand, it's kind of required for proper compliance
> > > to API pre-SO_TIMESTAMPING...
> > 
> > Hm. We actually oriented our code on the mv88e6xxx time stamping code base.
> 
> Where in mv88e6xxx does the driver set SKBTX_IN_PROGRESS?
> 

That's the point, it doesn't, and neither does hellcreek.

> I don't think it makes sense for DSA drivers to set this bit, as it
> serves no purpose in the DSA context.
> 

For whom does this bit serve a purpose, though, and how do you tell?

> Thanks,
> Richard

Thanks,
-Vladimir