linux-kernel - Re: [PATCH net-next v1 3/4] net: phy: do not force EEE support

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Date:   Mon, 20 Feb 2023 17:13:39 +0100
From:   Oleksij Rempel <o.rempel@...gutronix.de>
To:     Andrew Lunn <andrew@...n.ch>
Cc:     "Russell King (Oracle)" <linux@...linux.org.uk>,
        Heiner Kallweit <hkallweit1@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>, kernel@...gutronix.de,
        linux-kernel@...r.kernel.org, netdev@...r.kernel.org
Subject: Re: [PATCH net-next v1 3/4] net: phy: do not force EEE support

On Mon, Feb 20, 2023 at 04:48:26PM +0100, Andrew Lunn wrote:
> > Hm.. ethtool do not provide enough information about expected behavior.
> > Here is my expectation:
> > - "ethtool --set-eee lan1 eee on" should enable EEE if it is disabled.
> > - "ethtool --set-eee lan1 advertise 0x10" should change set of
> >   advertised modes.
> > - a sequence of "..advertise 0x10", "..eee on", "eee off" should restore
> >   preconfigured advertise modes. advertising_eee instead of
> >   supported_eee.
> 
> I agree ethtool is not very well documented. However, i would follow
> what -s does. You can pass link modes you want to advertise, and you
> can turn auto-neg on and off. Does turning auto-neg off and on again
> reset the links modes which are advertised? I don't actually know, but
> i think the behaviour should be consistent for link modes and EEE
> modes.

Hm.. "ethtool -s lan1 autoneg on" will restore supported values. Even
without switching it off.
In this case "eee on", supported_eee should be used.
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