netdev - Re: net-next: new CL45 regression

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Date:   Tue, 5 Mar 2019 07:58:34 +0100
From:   Heiner Kallweit <hkallweit1@...il.com>
To:     "S-k, Shyam-sundar" <Shyam-sundar.S-k@....com>
Cc:     "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "Lendacky, Thomas" <Thomas.Lendacky@....com>,
        Florian Fainelli <f.fainelli@...il.com>,
        David Miller <davem@...emloft.net>
Subject: Re: net-next: new CL45 regression

On 05.03.2019 04:07, S-k, Shyam-sundar wrote:
> Hi Heiner,
> 
> On 3/5/2019 2:18 AM, Heiner Kallweit wrote:
>> On 04.03.2019 15:48, S-k, Shyam-sundar wrote:
>>> Hi Heiner,
>>>
>>> We noticed that, the recent changes for CL45 in net-next tree causing regression on AMD platforms. The following is the commit:
>>>
>>> 3ce2a02 net: phy: marvell10g: check for newly set aneg
>>>
>>> Now, I see that, this code is moved to phy-c45.c with newer commit
>>>
>>> 1af9f16 net: phy: add genphy_c45_check_and_restart_aneg
>>>
>>> With this change, the link never comes up. Can you please a re-look once before it enters mainline?
>>>
>>> Thanks,
>>>
>>> Shyam
>>>
>> Hi Shyam,
>>
>> thanks for the report. However the description quite vague, therefore I'd appreciate the following details:
>>
>> - The mentioned patch affects Marvell 10G PHY's only. Could you please provide:
>>   - exact PHY model you're using
> Yes, we have on-board Marvell 88X3310 chip, which works as external PHY for AMD Ethernet controller.
>>   - interface mode you're using
> RJ45.
>>   - link speed you expect and advertised speeds from both sides
> Both advertised and link speeds are 1G SGMII
>>
>> - Some details regarding "AMD platform" would be helpful. What kind of board is it?
>>
>> - There's a known issue in genphy_c45_an_config_aneg(), however I'm not sure whether it could be related
>>   to your issue. Could you please test the following patch whether it fixes the issue for you?
>>   https://patchwork.ozlabs.org/patch/1051291/
> 
> Thank you very much! This patch fixes the problem.
> 
Great, thanks for the feedback. Patch has been applied to net-next few hours ago.

> -Shyam
> 
> 
Heiner