linux-kernel - Re: [PATCH net-next v7 15/16] net: ethtool: ts: Let the active time stamping layer be selectable

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Message-ID: <ZV0_8oOaHarW4rMQ@hoboy.vegasvil.org>
Date:   Tue, 21 Nov 2023 15:40:34 -0800
From:   Richard Cochran <richardcochran@...il.com>
To:     Köry Maincent <kory.maincent@...tlin.com>
Cc:     Vladimir Oltean <vladimir.oltean@....com>,
        Jakub Kicinski <kuba@...nel.org>,
        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>,
        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>,
        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 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)

Thanks,
Richard