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Date: Tue, 21 Nov 2023 15:40:34 -0800
From: Richard Cochran <>
To: Köry Maincent <>
Cc: Vladimir Oltean <>,
	Jakub Kicinski <>,
	Florian Fainelli <>,
	Broadcom internal kernel review list <>,
	Andrew Lunn <>,
	Heiner Kallweit <>,
	Russell King <>,
	"David S. Miller" <>,
	Eric Dumazet <>, Paolo Abeni <>,
	Radu Pirea <>,
	Jay Vosburgh <>,
	Andy Gospodarek <>,
	Nicolas Ferre <>,
	Claudiu Beznea <>,
	Willem de Bruijn <>,
	Jonathan Corbet <>,
	Horatiu Vultur <>,, Simon Horman <>,
	Thomas Petazzoni <>,,,,
	Maxime Chevallier <>
Subject: Re: [PATCH net-next v7 15/16] net: ethtool: ts: Let the active time
 stamping layer be selectable

On Tue, Nov 21, 2023 at 06:31:14PM +0100, Köry Maincent wrote:
> If I summarize, a solution could be this:
> - Expand struct hwtstamp_config with a phc_index member for the SIOCG/SHWTSTAMP
>   commands.
>   To keep backward compatibility if phc_index is not set in the hwtstamp_config
>   data from userspace use the default hwtstamp (the default being selected as
>   done in my patch series).
>   Is this possible, would it breaks things?

You can't "expand" hwtstamp_config because it is an established ABI.

(You could introduce SIOC[GS]HWTSTAMP_2 with an expanded layout)


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