netdev - Re: [PATCH net-next v4 00/23] net: add EEE support for KSZ9477 and AR8035 with i.MX6

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Date:   Mon, 6 Feb 2023 21:21:39 +0100
From:   Andrew Lunn <andrew@...n.ch>
To:     Oleksij Rempel <o.rempel@...gutronix.de>
Cc:     Vladimir Oltean <olteanv@...il.com>,
        Richard Cochran <richardcochran@...il.com>,
        Woojung Huh <woojung.huh@...rochip.com>,
        UNGLinuxDriver@...rochip.com,
        Vivien Didelot <vivien.didelot@...il.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>, Wei Fang <wei.fang@....com>,
        Heiner Kallweit <hkallweit1@...il.com>, kernel@...gutronix.de,
        linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
        Arun.Ramadoss@...rochip.com, intel-wired-lan@...ts.osuosl.org
Subject: Re: [PATCH net-next v4 00/23] net: add EEE support for KSZ9477 and
 AR8035 with i.MX6

> SmartEEE will be probably a bit more challenging. If MAC do not
> advertise EEE support, SmartEEE can be enabled. But it would break PTP
> if SmartEEE is active. Except SmartEEE capable PHY implements own PTP
> support. In any case, user space will need extra information to
> identify potential issues.

If we have a MAC driver which does not implement the ethtool set_eee()
and get_eee() ops, and a dev->phydev with the SmartEEE flag set, we
could have net/ethtool/eee.c call direct into phylib.

As for PTP and EEE, maybe we want the core PTP code to try calling
get_eee() and at minimum issue a warning if it is enabled, if it
thinks MAC PTP is being used?

       Andrew