Re: [PATCH v2 2/4] net: Expose available time stamping layers to user space.

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Subject: Re: [PATCH v2 2/4] net: Expose available time stamping layers to user space.
From: Jakub Kicinski <kuba@xxxxxxxxxx>
Date: Fri, 3 Mar 2023 15:52:17 -0800
Cc: linux-kernel@xxxxxxxxxxxxxxx, netdev@xxxxxxxxxxxxxxx, linux-omap@xxxxxxxxxxxxxxx, Michael Walle <michael@xxxxxxxx>, Richard Cochran <richardcochran@xxxxxxxxx>, thomas.petazzoni@xxxxxxxxxxx, Jay Vosburgh <j.vosburgh@xxxxxxxxx>, Veaceslav Falico <vfalico@xxxxxxxxx>, Andy Gospodarek <andy@xxxxxxxxxxxxx>, "David S. Miller" <davem@xxxxxxxxxxxxx>, Eric Dumazet <edumazet@xxxxxxxxxx>, Paolo Abeni <pabeni@xxxxxxxxxx>, Joakim Zhang <qiangqing.zhang@xxxxxxx>, Vladimir Oltean <vladimir.oltean@xxxxxxx>, Claudiu Manoil <claudiu.manoil@xxxxxxx>, Alexandre Belloni <alexandre.belloni@xxxxxxxxxxx>, UNGLinuxDriver@xxxxxxxxxxxxx, Grygorii Strashko <grygorii.strashko@xxxxxx>, Andrew Lunn <andrew@xxxxxxx>, Heiner Kallweit <hkallweit1@xxxxxxxxx>, Russell King <linux@xxxxxxxxxxxxxxx>, Minghao Chi <chi.minghao@xxxxxxxxxx>, Guangbin Huang <huangguangbin2@xxxxxxxxxx>, Jie Wang <wangjie125@xxxxxxxxxx>, Wolfram Sang <wsa+renesas@xxxxxxxxxxxxxxxxxxxx>, Sven Eckelmann <sven@xxxxxxxxxxxxx>, Wang Yufen <wangyufen@xxxxxxxxxx>, Oleksij Rempel <linux@xxxxxxxxxxxxxxxx>, Alexandru Tachici <alexandru.tachici@xxxxxxxxxx>
In-reply-to: <20230303164248.499286-3-kory.maincent@bootlin.com>
References: <20230303164248.499286-1-kory.maincent@bootlin.com> <20230303164248.499286-3-kory.maincent@bootlin.com>

On Fri,  3 Mar 2023 17:42:39 +0100 Köry Maincent wrote:
> 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 sysfs.

Ethtool, please, no sysfs.

References:
- [PATCH v2 0/4] Up until now, there was no way to let the user select the layer at which time stamping occurs. The stack assumed that PHY time stamping is always preferred, but some MAC/PHY combinations were buggy.
  - From: Köry Maincent
- [PATCH v2 2/4] net: Expose available time stamping layers to user space.
  - From: Köry Maincent

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