netdev - Re: [PATCH net-next v2 07/10] r8169: migrate speed

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Message-ID: <33b9c24f-99af-2029-8cd6-3811611af330@gmail.com>
Date:   Tue, 10 Jul 2018 23:26:13 +0200
From:   Heiner Kallweit <hkallweit1@...il.com>
To:     Andrew Lunn <andrew@...n.ch>
Cc:     David Miller <davem@...emloft.net>,
        Florian Fainelli <f.fainelli@...il.com>,
        Realtek linux nic maintainers <nic_swsd@...ltek.com>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: Re: [PATCH net-next v2 07/10] r8169: migrate speed_down function to
 phylib

On 10.07.2018 22:44, Andrew Lunn wrote:
>>  static void rtl_speed_down(struct rtl8169_private *tp)
>>  {
>> -	u32 adv;
>> -	int lpa;
>> +	struct phy_device *phydev = tp->dev->phydev;
>> +	u32 adv = phydev->lp_advertising & phydev->supported;
>>  
>> -	rtl_writephy(tp, 0x1f, 0x0000);
>> -	lpa = rtl_readphy(tp, MII_LPA);
>> +	if (adv & BASET10)
>> +		phydev->advertising &= ~(BASET100 | BASET1000);
>> +	else if (adv & BASET100)
>> +		phydev->advertising &= ~BASET1000;
> 
> Please use phy_set_max_speed(). We need MAC drivers to stop directly
> accessing phydev members. Otherwise we are going to have problems
> supporting 2.5G PHYs.
> 
The issue I see with phy_set_max_speed() is that it also adjusts
phydev->supported and I don't think that's what we want.
What the chip supports doesn't change, just what we want to
advertise.

> 	   Andrew
>