linux-kernel - Re: [PATCH net-next v6 5/9] net: phy: add genphy_c45_ethtool_get/set

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Date:   Wed, 8 Feb 2023 14:08:30 +0100
From:   Oleksij Rempel <o.rempel@...gutronix.de>
To:     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>,
        Vladimir Oltean <olteanv@...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>
Cc:     Arun.Ramadoss@...rochip.com, linux-kernel@...r.kernel.org,
        kernel@...gutronix.de, netdev@...r.kernel.org
Subject: Re: [PATCH net-next v6 5/9] net: phy: add
 genphy_c45_ethtool_get/set_eee() support

On Wed, Feb 08, 2023 at 11:32:07AM +0100, Oleksij Rempel wrote:
> Add replacement for phy_ethtool_get/set_eee() functions.
> 
> Current phy_ethtool_get/set_eee() implementation is great and it is
> possible to make it even better:
> - this functionality is for devices implementing parts of IEEE 802.3
>   specification beyond Clause 22. The better place for this code is
>   phy-c45.c
> - currently it is able to do read/write operations on PHYs with
>   different abilities to not existing registers. It is better to
>   use stored supported_eee abilities to avoid false read/write
>   operations.
> - the eee_active detection will provide wrong results on not supported
>   link modes. It is better to validate speed/duplex properties against
>   supported EEE link modes.
> - 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.
> 
> Signed-off-by: Oleksij Rempel <o.rempel@...gutronix.de>
  
> +/**
> + * genphy_c45_eee_is_active - get EEE supported and status
> + * @phydev: target phy_device struct
> + * @data: ethtool_eee data

I forgot to update this comment.

> + *
> + * Description: it reports the possible state of EEE functionality.
> + */
> +int genphy_c45_eee_is_active(struct phy_device *phydev, unsigned long *adv,
> +			     unsigned long *lp, bool *is_enabled)
> +{
> +	__ETHTOOL_DECLARE_LINK_MODE_MASK(tmp_adv) = {};
> +	__ETHTOOL_DECLARE_LINK_MODE_MASK(tmp_lp) = {};
> +	__ETHTOOL_DECLARE_LINK_MODE_MASK(common);
> +	bool eee_enabled, eee_active;
> +	int ret;
> +
> +	ret = genphy_c45_read_eee_adv(phydev, tmp_adv);
> +	if (ret)
> +		return ret;
> +
> +	ret = genphy_c45_read_eee_lpa(phydev, tmp_lp);
> +	if (ret)
> +		return ret;
> +
> +	eee_enabled = !linkmode_empty(tmp_adv);
> +	linkmode_and(common, tmp_adv, tmp_lp);
> +	if (eee_enabled && !linkmode_empty(common))i

and linkmode_empty() can be replaced with linkmode_intersects()

I'll wait if more comments will come and make a new version tomorrow.

Regards,
Oleksij
-- 
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