netdev - Re: [PATCH net-next v4 05/23] net: phy: add genphy_c45_ethtool_get/set

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Date:   Sat, 4 Feb 2023 03:11:33 +0200
From:   Vladimir Oltean <olteanv@...il.com>
To:     Oleksij Rempel <o.rempel@...gutronix.de>
Cc:     Woojung Huh <woojung.huh@...rochip.com>,
        UNGLinuxDriver@...rochip.com, Andrew Lunn <andrew@...n.ch>,
        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 05/23] net: phy: add
 genphy_c45_ethtool_get/set_eee() support

On Wed, Feb 01, 2023 at 03:58:27PM +0100, Oleksij Rempel wrote:
> Add replacement for phy_ethtool_get/set_eee() functions.
> 
> - it is able to support only limited amount of link modes. We have more
>   EEE link modes...
> 
> By refactoring this code I address most of this point except of the last
> one. Adding additional EEE link modes will need more work.

> +/**
> + * genphy_c45_ethtool_get_eee - get EEE supported and status
> + * @phydev: target phy_device struct
> + * @data: ethtool_eee data
> + *
> + * Description: it reports the Supported/Advertisement/LP Advertisement
> + * capabilities.
> + */
> +int genphy_c45_ethtool_get_eee(struct phy_device *phydev,
> +			       struct ethtool_eee *data)
> +{
> +	__ETHTOOL_DECLARE_LINK_MODE_MASK(adv) = {};
> +	__ETHTOOL_DECLARE_LINK_MODE_MASK(lp) = {};
> +	bool overflow = false, is_enabled;
> +	int ret;
> +
> +	ret = genphy_c45_eee_is_active(phydev, adv, lp, &is_enabled);
> +	if (ret < 0)
> +		return ret;
> +
> +	data->eee_enabled = is_enabled;
> +	data->eee_active = ret;
> +
> +	if (!ethtool_convert_link_mode_to_legacy_u32(&data->supported,
> +						     phydev->supported_eee))
> +		overflow = true;
> +	if (!ethtool_convert_link_mode_to_legacy_u32(&data->advertised, adv))
> +		overflow = true;
> +	if (!ethtool_convert_link_mode_to_legacy_u32(&data->lp_advertised, lp))
> +		overflow = true;

ah, ok, so since struct ethtool_eee stores the link modes in the old u32
format, link modes equal to ETHTOOL_LINK_MODE_25000baseKR_Full_BIT or
higher would truncate. Makes sense.

> +
> +	if (overflow)
> +		phydev_warn(phydev, "Not all supported or advertised EEE link modes was passed to the user space\n");

were passed

> +
> +	return 0;
> +}
> +EXPORT_SYMBOL(genphy_c45_ethtool_get_eee);