netdev - Re: [PATCH net-next v7 5/9] net: phy: add genphy_c45_ethtool_get/set

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Date:   Fri, 10 Feb 2023 07:43:51 -0800
From:   Alexander H Duyck <alexander.duyck@...il.com>
To:     Oleksij Rempel <o.rempel@...gutronix.de>,
        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:     kernel@...gutronix.de, linux-kernel@...r.kernel.org,
        netdev@...r.kernel.org, Arun.Ramadoss@...rochip.com
Subject: Re: [PATCH net-next v7 5/9] net: phy: add
 genphy_c45_ethtool_get/set_eee() support

On Thu, 2023-02-09 at 10:51 +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>
> ---
>  drivers/net/phy/phy-c45.c | 238 ++++++++++++++++++++++++++++++++++++++
>  include/linux/mdio.h      |  58 ++++++++++
>  include/linux/phy.h       |   7 ++
>  include/uapi/linux/mdio.h |   8 ++
>  4 files changed, 311 insertions(+)
> 
> 

<...>

> diff --git a/include/linux/mdio.h b/include/linux/mdio.h
> index e75583f5d967..e3568e44efd0 100644
> --- a/include/linux/mdio.h
> +++ b/include/linux/mdio.h
> @@ -428,6 +428,64 @@ static inline void mii_eee_cap1_mod_linkmode_t(unsigned long *adv, u32 val)
>  			 adv, val & MDIO_EEE_10GKR);
>  }
>  
> +/**
> + * mii_eee_cap1_mod_linkmode_t
> + * @adv: the linkmode advertisement settings
> + *
> + * A function that translates linkmode to value for IEEE 802.3-2018 45.2.7.13
> + * "EEE advertisement 1" register (7.60)
> + */
> +static inline u32 linkmode_to_mii_eee_cap1_t(unsigned long *adv)

So the function comments don't match the name for the function. Perhaps
a copy/paste error? Otherwise the rest of the function description
looks fine.

> +{
> +	u32 result = 0;
> +
> +	if (linkmode_test_bit(ETHTOOL_LINK_MODE_100baseT_Full_BIT, adv))
> +		result |= MDIO_EEE_100TX;
> +	if (linkmode_test_bit(ETHTOOL_LINK_MODE_1000baseT_Full_BIT, adv))
> +		result |= MDIO_EEE_1000T;
> +	if (linkmode_test_bit(ETHTOOL_LINK_MODE_10000baseT_Full_BIT, adv))
> +		result |= MDIO_EEE_10GT;
> +	if (linkmode_test_bit(ETHTOOL_LINK_MODE_1000baseKX_Full_BIT, adv))
> +		result |= MDIO_EEE_1000KX;
> +	if (linkmode_test_bit(ETHTOOL_LINK_MODE_10000baseKX4_Full_BIT, adv))
> +		result |= MDIO_EEE_10GKX4;
> +	if (linkmode_test_bit(ETHTOOL_LINK_MODE_10000baseKR_Full_BIT, adv))
> +		result |= MDIO_EEE_10GKR;
> +
> +	return result;
> +}
> +