linux-kernel - RE: [PATCH 1/3] net: ethernet: add support for PCS and 2.5G speed

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Message-ID: <CO2PR07MB246952FB454FDD08FA41F624C1780@CO2PR07MB2469.namprd07.prod.outlook.com>
Date:   Sat, 23 Feb 2019 06:24:10 +0000
From:   Parshuram Raju Thombare <pthombar@...ence.com>
To:     Andrew Lunn <andrew@...n.ch>
CC:     "nicolas.ferre@...rochip.com" <nicolas.ferre@...rochip.com>,
        "davem@...emloft.net" <davem@...emloft.net>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "f.fainelli@...il.com" <f.fainelli@...il.com>,
        "hkallweit1@...il.com" <hkallweit1@...il.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Rafal Ciepiela <rafalc@...ence.com>,
        Piotr Sroka <piotrs@...ence.com>, Jan Kotas <jank@...ence.com>
Subject: RE: [PATCH 1/3] net: ethernet: add support for PCS and 2.5G speed

>>  	/* mask with MAC supported features */
>> -	if (macb_is_gem(bp) && bp->caps &
>MACB_CAPS_GIGABIT_MODE_AVAILABLE)
>> -		phy_set_max_speed(phydev, SPEED_1000);
>> -	else
>> -		phy_set_max_speed(phydev, SPEED_100);
>> +	if (macb_is_gem(bp)) {
>> +		linkmode_copy(phydev->supported, PHY_GBIT_FEATURES);
>> +		if (bp->caps & MACB_CAPS_TWO_PT_FIVE_GIG_SPEED)
>> +
>	linkmode_set_bit(ETHTOOL_LINK_MODE_2500baseT_Full_BIT,
>> +					 phydev->supported);
>> +	} else {
>> +		linkmode_copy(phydev->supported, PHY_BASIC_FEATURES);
>> +	}
>> +
>> +	linkmode_copy(phydev->advertising, phydev->supported);
>
>This is not correct. Just because the MAC can do 2.5G does not mean the PHY
>can. So you should not be adding links modes. Also, somebody might be using a
>PHY that can do 2.5G with a MAC which can only do 1G.
>
>The correct thing to do is call phy_set_max_speed() with the maximum speed the
>MAC can do.
Hi Andrew,

Ok, I think this should have been logical AND. I will modify to use phy_set_max_speed() 
instead of directly copying linkmodes.

Regards,
Parshuram Thombare