linux-kernel - Re: [PATCH v3 2/5] net: Expose available time stamping layers to user space.

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Date:   Thu, 9 Mar 2023 00:54:25 +0200
From:   Vladimir Oltean <olteanv@...il.com>
To:     Köry Maincent <kory.maincent@...tlin.com>
Cc:     Andrew Lunn <andrew@...n.ch>,
        Florian Fainelli <f.fainelli@...il.com>,
        Heiner Kallweit <hkallweit1@...il.com>, netdev@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-doc@...r.kernel.org, linux-omap@...r.kernel.org,
        Michael Walle <michael@...le.cc>,
        Maxime Chevallier <maxime.chevallier@...tlin.com>,
        Richard Cochran <richardcochran@...il.com>,
        thomas.petazzoni@...tlin.com, Russell King <linux@...linux.org.uk>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Jonathan Corbet <corbet@....net>,
        Jay Vosburgh <j.vosburgh@...il.com>,
        Veaceslav Falico <vfalico@...il.com>,
        Andy Gospodarek <andy@...yhouse.net>,
        Joakim Zhang <qiangqing.zhang@....com>,
        Vladimir Oltean <vladimir.oltean@....com>,
        Claudiu Manoil <claudiu.manoil@....com>,
        Alexandre Belloni <alexandre.belloni@...tlin.com>,
        UNGLinuxDriver@...rochip.com,
        Grygorii Strashko <grygorii.strashko@...com>,
        Minghao Chi <chi.minghao@....com.cn>,
        Guangbin Huang <huangguangbin2@...wei.com>,
        Jie Wang <wangjie125@...wei.com>,
        Oleksij Rempel <linux@...pel-privat.de>,
        Alexandru Tachici <alexandru.tachici@...log.com>,
        "Gustavo A. R. Silva" <gustavoars@...nel.org>,
        Sean Anderson <sean.anderson@...o.com>,
        Wolfram Sang <wsa+renesas@...g-engineering.com>,
        Alexander Lobakin <alexandr.lobakin@...el.com>,
        Maxim Korotkov <korotkov.maxim.s@...il.com>,
        Marco Bonelli <marco@...eim.net>
Subject: Re: [PATCH v3 2/5] net: Expose available time stamping layers to
 user space.

Hi Köry,

On Wed, Mar 08, 2023 at 02:59:26PM +0100, Köry Maincent wrote:
> From: Kory Maincent <kory.maincent@...tlin.com>
> 
> Time stamping on network packets may happen either in the MAC or in
> the PHY, but not both.  In preparation for making the choice
> selectable, expose both the current and available layers via ethtool.
> 
> In accordance with the kernel implementation as it stands, the current
> layer will always read as "phy" when a PHY time stamping device is
> present.  Future patches will allow changing the current layer
> administratively.
> 
> Signed-off-by: Richard Cochran <richardcochran@...il.com>
> Signed-off-by: Kory Maincent <kory.maincent@...tlin.com>
> ---

I'm pretty sure that all new ethtool commands must be implemented
through the genetlink socket interface. The ioctl interface stopped
being extended and is in maintenance mode only.