netdev - Re: [PATCH net-next 1/2] net: phy: improve phy_resolve_aneg

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Date:   Fri, 15 Feb 2019 14:57:14 +0100
From:   Andrew Lunn <andrew@...n.ch>
To:     Heiner Kallweit <hkallweit1@...il.com>
Cc:     Florian Fainelli <f.fainelli@...il.com>,
        David Miller <davem@...emloft.net>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: Re: [PATCH net-next 1/2] net: phy: improve phy_resolve_aneg_linkmode

On Thu, Feb 14, 2019 at 10:15:31PM +0100, Heiner Kallweit wrote:
> We have the settings array of modes which is sorted based on aneg
> priority. Instead of checking each mode manually let's simply iterate
> over the sorted settings.
> 
> Signed-off-by: Heiner Kallweit <hkallweit1@...il.com>
> ---
>  drivers/net/phy/phy-core.c | 43 +++++++-------------------------------
>  1 file changed, 7 insertions(+), 36 deletions(-)
> 
> diff --git a/drivers/net/phy/phy-core.c b/drivers/net/phy/phy-core.c
> index cdea028d1..5d43106fe 100644
> --- a/drivers/net/phy/phy-core.c
> +++ b/drivers/net/phy/phy-core.c
> @@ -349,45 +349,16 @@ size_t phy_speeds(unsigned int *speeds, size_t size,
>  void phy_resolve_aneg_linkmode(struct phy_device *phydev)
>  {
>  	__ETHTOOL_DECLARE_LINK_MODE_MASK(common);
> +	int i;
>  
>  	linkmode_and(common, phydev->lp_advertising, phydev->advertising);
>  
> -	if (linkmode_test_bit(ETHTOOL_LINK_MODE_10000baseT_Full_BIT, common)) {
> -		phydev->speed = SPEED_10000;
> -		phydev->duplex = DUPLEX_FULL;
> -	} else if (linkmode_test_bit(ETHTOOL_LINK_MODE_5000baseT_Full_BIT,
> -				     common)) {
> -		phydev->speed = SPEED_5000;
> -		phydev->duplex = DUPLEX_FULL;
> -	} else if (linkmode_test_bit(ETHTOOL_LINK_MODE_2500baseT_Full_BIT,
> -				     common)) {
> -		phydev->speed = SPEED_2500;
> -		phydev->duplex = DUPLEX_FULL;
> -	} else if (linkmode_test_bit(ETHTOOL_LINK_MODE_1000baseT_Full_BIT,
> -				     common)) {
> -		phydev->speed = SPEED_1000;
> -		phydev->duplex = DUPLEX_FULL;
> -	} else if (linkmode_test_bit(ETHTOOL_LINK_MODE_1000baseT_Half_BIT,
> -				     common)) {
> -		phydev->speed = SPEED_1000;
> -		phydev->duplex = DUPLEX_HALF;
> -	} else if (linkmode_test_bit(ETHTOOL_LINK_MODE_100baseT_Full_BIT,
> -				     common)) {
> -		phydev->speed = SPEED_100;
> -		phydev->duplex = DUPLEX_FULL;
> -	} else if (linkmode_test_bit(ETHTOOL_LINK_MODE_100baseT_Half_BIT,
> -				     common)) {
> -		phydev->speed = SPEED_100;
> -		phydev->duplex = DUPLEX_HALF;
> -	} else if (linkmode_test_bit(ETHTOOL_LINK_MODE_10baseT_Full_BIT,
> -				     common)) {
> -		phydev->speed = SPEED_10;
> -		phydev->duplex = DUPLEX_FULL;
> -	} else if (linkmode_test_bit(ETHTOOL_LINK_MODE_10baseT_Half_BIT,
> -				     common)) {
> -		phydev->speed = SPEED_10;
> -		phydev->duplex = DUPLEX_HALF;
> -	}
> +	for (i = 0; i < ARRAY_SIZE(settings); i++)
> +		if (test_bit(settings[i].bit, common)) {
> +			phydev->speed = settings[i].speed;
> +			phydev->duplex = settings[i].duplex;
> +			break;
> +		}

Hi Heiner

Nice simplification.

I just have one thought about this. The original code was limited to
baseT. The new code could in theory return a non BaseT speed. For that
to happen, it would require that phydev->lp_advertising and
phydev->advertising contain a non BaseT link mode? Is that possible?
I don't think it is.

  Andrew