netdev - Re: [PATCH v4 net-next 2/8] net: phylink: introduce generic method to query PHY in-band autoneg capability

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Message-ID: <20221118155614.uswrmo65ap4i3hih@skbuf>
Date:   Fri, 18 Nov 2022 17:56:14 +0200
From:   Vladimir Oltean <vladimir.oltean@....com>
To:     Sean Anderson <sean.anderson@...o.com>
Cc:     netdev@...r.kernel.org, "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Heiner Kallweit <hkallweit1@...il.com>,
        Andrew Lunn <andrew@...n.ch>,
        Russell King <linux@...linux.org.uk>,
        Florian Fainelli <f.fainelli@...il.com>,
        UNGLinuxDriver@...rochip.com,
        bcm-kernel-feedback-list@...adcom.com,
        Madalin Bucur <madalin.bucur@....nxp.com>,
        Camelia Groza <camelia.groza@....com>,
        Claudiu Manoil <claudiu.manoil@....com>,
        Ioana Ciornei <ioana.ciornei@....com>,
        Maxim Kochetkov <fido_max@...ox.ru>,
        Antoine Tenart <atenart@...nel.org>,
        Michael Walle <michael@...le.cc>,
        Raag Jadav <raagjadav@...il.com>,
        Siddharth Vadapalli <s-vadapalli@...com>,
        Ong Boon Leong <boon.leong.ong@...el.com>,
        Colin Foster <colin.foster@...advantage.com>,
        Marek Behun <marek.behun@....cz>
Subject: Re: [PATCH v4 net-next 2/8] net: phylink: introduce generic method
 to query PHY in-band autoneg capability

On Fri, Nov 18, 2022 at 10:49:30AM -0500, Sean Anderson wrote:
> If we have the opportunity, we should try to make invalid return codes
> inexpressible. If we remove the extra bit, then all the combinations we
> would like to have:
> 
> - I don't know what I support
> - In-band must be enabled
> - In-band must be disabled
> - I can support either
> 
> are exactly the combinations supported by the underlying data.

So the change request is to make the enum look like this?

enum phy_an_inband {
	PHY_AN_INBAND_UNKNOWN		= 0,
	PHY_AN_INBAND_OFF		= BIT(0),
	PHY_AN_INBAND_ON		= BIT(1),
};