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

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Date:   Wed, 22 Nov 2023 10:01:42 -0800
From:   Jakub Kicinski <kuba@...nel.org>
To:     Vladimir Oltean <vladimir.oltean@....com>
Cc:     Köry Maincent <kory.maincent@...tlin.com>,
        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>,
        Richard Cochran <richardcochran@...il.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 Wed, 22 Nov 2023 18:55:17 +0200 Vladimir Oltean wrote:
> > Well, ethtool has been the catch all for a lot of random things
> > for the longest time. The question is whether we want to extend
> > ETHTOOL_GET_TS_INFO or add a third API somewhere else. And if we
> > do - do we also duplicate the functionality of ETHTOOL_GET_TS_INFO
> > (i.e. getting capabilities)?
> > 
> > My vote is that keeping it in ethtool is less bad than 3rd API.  
> 
> With SIOCSHWTSTAMP also implemented by CAN (and presumably also by
> wireless in the future), I do wonder whether ethtool is the right place
> for the netlink conversion.

ethtool currently provides the only way we have to configure ring
length, ring count, RSS, UDP tunnels etc.

It's a matter of taste, IMO ethtool is a bit of a lost cause already
and keeping things together (ethtool already has TS_INFO) is cleaner
than spreading them around.

> I wouldn't suggest duplicating ETHTOOL_GET_TS_INFO towards the netdev
> netlink family.

FTR so far the netdev family is all about SW configuration. We should
probably keep it that way, so it doesn't become ginormous. It's easy
enough to create a new family, if needed.