netdev - Re: [RFC PATCH v3 net-next 2/6] net: phylink: introduce a generic method for querying PHY in-band autoneg capability

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Date:   Wed, 22 Sep 2021 22:22:19 +0100
From:   "Russell King (Oracle)" <linux@...linux.org.uk>
To:     Vladimir Oltean <vladimir.oltean@....com>
Cc:     netdev@...r.kernel.org, Antoine Tenart <atenart@...nel.org>,
        Michael Walle <michael@...le.cc>,
        Heiner Kallweit <hkallweit1@...il.com>,
        Andrew Lunn <andrew@...n.ch>,
        Florian Fainelli <f.fainelli@...il.com>,
        Ioana Ciornei <ioana.ciornei@....com>,
        Maxim Kochetkov <fido_max@...ox.ru>,
        Bjarni Jonasson <bjarni.jonasson@...rochip.com>,
        Steen Hegelund <steen.hegelund@...rochip.com>,
        UNGLinuxDriver@...rochip.com,
        bcm-kernel-feedback-list@...adcom.com,
        Nicolas Ferre <nicolas.ferre@...rochip.com>,
        Claudiu Beznea <claudiu.beznea@...rochip.com>
Subject: Re: [RFC PATCH v3 net-next 2/6] net: phylink: introduce a generic
 method for querying PHY in-band autoneg capability

On Wed, Sep 22, 2021 at 09:14:42PM +0300, Vladimir Oltean wrote:
> +static unsigned int phylink_fixup_inband_aneg(struct phylink *pl,
> +					      struct phy_device *phy,
> +					      unsigned int mode)
> +{
> +	int ret;
> +
> +	ret = phy_validate_inband_aneg(phy, pl->link_interface);
> +	if (ret == PHY_INBAND_ANEG_UNKNOWN) {
> +		phylink_dbg(pl,
> +			    "PHY driver does not report in-band autoneg capability, assuming %s\n",
> +			    phylink_autoneg_inband(mode) ? "true" : "false");
> +
> +		return mode;
> +	}
> +
> +	if (phylink_autoneg_inband(mode) && !(ret & PHY_INBAND_ANEG_ON)) {
> +		phylink_err(pl,
> +			    "Requested in-band autoneg but driver does not support this, disabling it.\n");

If we add support to the BCM84881 driver to work with
phy_validate_inband_aneg(), then this will always return
PHY_INBAND_ANEG_OFF and never PHY_INBAND_ANEG_ON. Consequently,
this will always produce this "error". It is not an error in the
SFP case, but it is if firmware is misconfigured.

So, this needs better handling - we should not be issuing an error-
level kernel message for something that is "normal".

-- 
RMK's Patch system: https://www.armlinux.org.uk/developer/patches/
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