netdev - Re: [PATCH v2 3/4] net: Let the active time stamping layer be selectable.

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Message-ID: <011d63c3-e3ff-4b67-8ab7-d39f541c7b31@lunn.ch>
Date:   Sat, 4 Mar 2023 16:43:47 +0100
From:   Andrew Lunn <andrew@...n.ch>
To:     Köry Maincent <kory.maincent@...tlin.com>
Cc:     linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
        linux-omap@...r.kernel.org, Michael Walle <michael@...le.cc>,
        Richard Cochran <richardcochran@...il.com>,
        thomas.petazzoni@...tlin.com, Jay Vosburgh <j.vosburgh@...il.com>,
        Veaceslav Falico <vfalico@...il.com>,
        Andy Gospodarek <andy@...yhouse.net>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        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>,
        Heiner Kallweit <hkallweit1@...il.com>,
        Russell King <linux@...linux.org.uk>,
        Minghao Chi <chi.minghao@....com.cn>,
        Jie Wang <wangjie125@...wei.com>,
        Guangbin Huang <huangguangbin2@...wei.com>,
        Wolfram Sang <wsa+renesas@...g-engineering.com>,
        Wang Yufen <wangyufen@...wei.com>,
        Alexandru Tachici <alexandru.tachici@...log.com>,
        Oleksij Rempel <linux@...pel-privat.de>
Subject: Re: [PATCH v2 3/4] net: Let the active time stamping layer be
 selectable.

On Fri, Mar 03, 2023 at 05:42:40PM +0100, Köry Maincent wrote:
> From: Richard Cochran <richardcochran@...il.com>
> 
> Make the sysfs knob writable, and add checks in the ioctl and time
> stamping paths to respect the currently selected time stamping layer.

Although it probably works, i think the ioctl code is ugly.

I think it would be better to pull the IOCTL code into the PTP object
interface. Add an ioctl member to struct ptp_clock_info. The PTP core
can then directly call into the PTP object.

You now have a rather odd semantic that calling the .ndo_eth_ioctl
means operate on the MAC PTP. If you look at net_device_ops, i don't
think any of the other members have this semantic. They all look at
the netdev as a whole, and ask the netdev to do something, without
caring what level it operates at. So a PTP ioctl should operate on
'the' PTP of the netdev, whichever that might be, MAC or PHY.

Clearly, it is a bigger change, you need to touch every MAC driver
with PTP support, but at the end, you have a cleaner architecture.

     Andrew