linux-kernel - Re: [PATCH net-next v7 08/16] net: ethtool: Add a command to expose current time stamping layer

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Date:   Mon, 20 Nov 2023 10:17:57 +0100
From:   Köry Maincent <kory.maincent@...tlin.com>
To:     Jakub Kicinski <kuba@...nel.org>
Cc:     Florian Fainelli <florian.fainelli@...adcom.com>,
        Broadcom internal kernel review list 
        <bcm-kernel-feedback-list@...adcom.com>,
        Andrew Lunn <andrew@...n.ch>,
        Heiner Kallweit <hkallweit1@...il.com>,
        Russell King <linux@...linux.org.uk>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Paolo Abeni <pabeni@...hat.com>,
        Richard Cochran <richardcochran@...il.com>,
        Radu Pirea <radu-nicolae.pirea@....nxp.com>,
        Jay Vosburgh <j.vosburgh@...il.com>,
        Andy Gospodarek <andy@...yhouse.net>,
        Nicolas Ferre <nicolas.ferre@...rochip.com>,
        Claudiu Beznea <claudiu.beznea@...on.dev>,
        Willem de Bruijn <willemdebruijn.kernel@...il.com>,
        Jonathan Corbet <corbet@....net>,
        Horatiu Vultur <horatiu.vultur@...rochip.com>,
        UNGLinuxDriver@...rochip.com, Simon Horman <horms@...nel.org>,
        Vladimir Oltean <vladimir.oltean@....com>,
        Thomas Petazzoni <thomas.petazzoni@...tlin.com>,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-doc@...r.kernel.org,
        Maxime Chevallier <maxime.chevallier@...tlin.com>
Subject: Re: [PATCH net-next v7 08/16] net: ethtool: Add a command to expose
 current time stamping layer

On Sat, 18 Nov 2023 18:24:24 -0800
Jakub Kicinski <kuba@...nel.org> wrote:

> On Tue, 14 Nov 2023 12:28:36 +0100 Kory Maincent wrote:
> > +		ops->get_ts_info(dev, &ts_info);
> > +		if (ts_info.so_timestamping &
> > +		    SOF_TIMESTAMPING_HARDWARE_MASK)
> > +			data->ts_layer = MAC_TIMESTAMPING;
> > +
> > +		if (ts_info.so_timestamping &
> > +		    SOF_TIMESTAMPING_SOFTWARE_MASK)
> > +			data->ts_layer = SOFTWARE_TIMESTAMPING;  
> 
> How does this work? so_timestamping is capabilities, not what's
> enabled now. So if driver supports SW stamping we always return
> SOFTWARE?

Yes, the software timestamping comes from the MAC capabilities.
I decided to separate software and MAC timestamping. If we select PHY
timestamping we can't use software timestamping and for an user, selecting the
MAC as timestamping seems not logical to use software timestamping.

Indeed there is a mistake here I should have used "else if" condition.
Mmh in fact, maybe not, because it would breaks the access to software
timestamping until patch 13.
I will remove the SOFTWARE/MAC timestamping distinction from this patch.

Regards,
-- 
Köry Maincent, Bootlin
Embedded Linux and kernel engineering
https://bootlin.com