netdev - Re: [PATH RFC net-next 3/8] net: phy: Add helper to convert MII ADV register to a linkmode

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Date:   Fri, 14 Sep 2018 15:23:14 -0700
From:   Florian Fainelli <f.fainelli@...il.com>
To:     Andrew Lunn <andrew@...n.ch>, netdev <netdev@...r.kernel.org>
Subject: Re: [PATH RFC net-next 3/8] net: phy: Add helper to convert MII ADV
 register to a linkmode

On 09/14/2018 02:38 PM, Andrew Lunn wrote:
> The phy_mii_ioctl can be used to write a value into the MII_ADVERTISE
> register in the PHY. Since this changes the state of the PHY, we need
> to make the same change to phydev->advertising. Add a helper which can
> convert the register value to a linkmode.

It would have been nice if we could eliminate the duplication between
mii_adv_to_ethtool_adv_t() and mii_adv_to_linkmode_adv_t() but I don't
really see how without changing the former function's signature.

Reviewed-by: Florian Fainelli <f.fainelli@...il.com>

> 
> Signed-off-by: Andrew Lunn <andrew@...n.ch>
> ---
>  include/linux/mii.h | 31 +++++++++++++++++++++++++++++++
>  1 file changed, 31 insertions(+)
> 
> diff --git a/include/linux/mii.h b/include/linux/mii.h
> index 567047ef0309..8c7da9473ad9 100644
> --- a/include/linux/mii.h
> +++ b/include/linux/mii.h
> @@ -303,6 +303,37 @@ static inline u32 mii_lpa_to_ethtool_lpa_x(u32 lpa)
>  	return result | mii_adv_to_ethtool_adv_x(lpa);
>  }
>  
> +/**
> + * mii_adv_to_linkmode_adv_t
> + * @advertising:pointer to destination link mode.
> + * @adv: value of the MII_ADVERTISE register
> + *
> + * A small helper function that translates MII_ADVERTISE bits
> + * to linkmode advertisement settings.
> + */
> +static inline void mii_adv_to_linkmode_adv_t(unsigned long *advertising,
> +					     u32 adv)
> +{
> +	linkmode_zero(advertising);
> +
> +	if (adv & ADVERTISE_10HALF)
> +		linkmode_set_bit(ETHTOOL_LINK_MODE_10baseT_Half_BIT,
> +				 advertising);
> +	if (adv & ADVERTISE_10FULL)
> +		linkmode_set_bit(ETHTOOL_LINK_MODE_10baseT_Full_BIT,
> +				 advertising);
> +	if (adv & ADVERTISE_100HALF)
> +		linkmode_set_bit(ETHTOOL_LINK_MODE_100baseT_Half_BIT,
> +				 advertising);
> +	if (adv & ADVERTISE_100FULL)
> +		linkmode_set_bit(ETHTOOL_LINK_MODE_100baseT_Full_BIT,
> +				 advertising);
> +	if (adv & ADVERTISE_PAUSE_CAP)
> +		linkmode_set_bit(ETHTOOL_LINK_MODE_Pause_BIT, advertising);
> +	if (adv & ADVERTISE_PAUSE_ASYM)
> +		linkmode_set_bit(ETHTOOL_LINK_MODE_Asym_Pause_BIT, advertising);
> +}
> +
>  /**
>   * mii_advertise_flowctrl - get flow control advertisement flags
>   * @cap: Flow control capabilities (FLOW_CTRL_RX, FLOW_CTRL_TX or both)
> 


-- 
Florian