netdev - Re: EG20T and Micrel KSZ9021 Gigabit Ethernet

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Message-ID: <CAE3RKNmEWk+=OOWzpA+wEmSGRdbKeCpn6PS+dNTTridAPEXbuw@mail.gmail.com>
Date:	Thu, 25 Oct 2012 22:49:12 +0200
From:	Veaceslav Falico <darkmag@...il.com>
To:	James Kosin <jkosin@...comgrp.com>
Cc:	Francois Romieu <romieu@...zoreil.com>, netdev@...r.kernel.org
Subject: Re: EG20T and Micrel KSZ9021 Gigabit Ethernet

On Thu, Oct 25, 2012 at 10:30 PM, James Kosin <jkosin@...comgrp.com> wrote:
>
> On 10/16/2012 1:13 PM, James Kosin wrote:
>> Hmmm... interesting turn of events.
>>
>> The problem seems to be in 10 speed support.  I hooked the Ethernet
>> PHY to a100TX port and don't get these errors.
>>
>> James
>>
>> On 10/5/2012 5:09 PM, Francois Romieu wrote:
>>> (please don't top post)
>>>
>>> James Kosin <jkosin@...comgrp.com> :
>>>> The driver is always reporting:
>>>>     [...] pch_gbe: Transfer Carrier Sense Error
>>> You should send more information. Say dmesg, link stats (ip link),
>>> ethtool information, stats and offload settings.
>>>
>>> We have a small Micrel ksz9021 phy driver that the pch_gbe driver does
>>> not use and the latter pokes into some phy specific register (0x10) that
>>> the Micrel document does not include in its list of vendor registers...
>>>
>>> Does your motherboard vendor offer some linux driver ?
>>>
>>> /note to myself: pch_gbe should use standard mii.h registers instead
>>> of defining its own redundant set of registers.
>>>
>>> --
>>> Ueimor
>>>
>>
> Ueimor & All,
>
> The "Transfer Carrier Sense Error" seems to have been hardware related.
> I replaced with a 10/100Mbps device and the interface is working
> correctly now.  My hardware engineer is going to look at the 10Mbps HUB
> later to find out what is going on with that piece of equipment; so, we
> know what to do when we have future issues.

Did you run pch_gbe on 1gbps? It might be also speed related, in my tests
the driver gave CRC errors only on high loads.

>
> James
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