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 18:55:17 +0200
From:   Vladimir Oltean <vladimir.oltean@....com>
To:     Jakub Kicinski <kuba@...nel.org>
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, Nov 22, 2023 at 08:50:00AM -0800, Jakub Kicinski wrote:
> On Wed, 22 Nov 2023 16:08:50 +0200 Vladimir Oltean wrote:
> > My understanding of Jakub's email was that he wants to see the functionality
> > offered by SIOCGHWTSTAMP and SIOCSHWTSTAMP converted to netlink. I don't
> > think that ethtool is the correct netlink family for that, given that
> > these aren't ethtool ioctls to begin with. Maybe the new netdev netlink
> > family. The conversion in its basic form would offer exactly the same
> > functionality.
> 
> 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.

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

> > The concept of an "active phc_index" would not explicitly exist in the
> > UAPI. Thus I'm not sure what's with this TSINFO_SET being floated around.
> > The only thing would exist is a configurable rx_filter and tx_type per
> > hwtstamp provider (aka "{phc_index, qualifier}"). User space will have
> > to learn to select the hwtstamp provider it wants to configure through
> > netlink, and use for its class of traffic.
> 
> "Active provider" is the one that has TX_ON, rx != FILTER_NONE, right?

In the "implicit" definition of an "active hwtstamp provider", yes.