netdev - RE: 82571EB: Detected Hardware Unit Hang

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Date:	Thu, 15 Nov 2012 20:26:36 +0000
From:	"Dave, Tushar N" <tushar.n.dave@...el.com>
To:	Joe Jin <joe.jin@...cle.com>
CC:	"e1000-devel@...ts.sf.net" <e1000-devel@...ts.sf.net>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Mary Mcgrath <mary.mcgrath@...cle.com>
Subject: RE: 82571EB: Detected Hardware Unit Hang

>-----Original Message-----
>From: Joe Jin [mailto:joe.jin@...cle.com]
>Sent: Wednesday, November 14, 2012 4:33 PM
>To: Dave, Tushar N
>Cc: e1000-devel@...ts.sf.net; netdev@...r.kernel.org; linux-
>kernel@...r.kernel.org; Mary Mcgrath
>Subject: Re: 82571EB: Detected Hardware Unit Hang
>
>On 11/14/12 11:45, Dave, Tushar N wrote:
>>> -----Original Message-----
>>> From: Joe Jin [mailto:joe.jin@...cle.com]
>>> Sent: Tuesday, November 13, 2012 6:48 PM
>>> To: Dave, Tushar N
>>> Cc: e1000-devel@...ts.sf.net; netdev@...r.kernel.org; linux-
>>> kernel@...r.kernel.org; Mary Mcgrath
>>> Subject: Re: 82571EB: Detected Hardware Unit Hang
>>>
>>> On 11/09/12 04:35, Dave, Tushar N wrote:
>>>> All devices in path from root complex to 82571, should have *same*
>>>> max
>>> payload size otherwise it can cause hang.
>>>> Can you double check this?
>>>
>>> Hi Tushar,
>>>
>>> Checked with hardware vendor and they said no way to modify the max
>>> payload size from BIOS, can I modify it from driver side?
>>
>> If you want to change value for 82571 device you can do it from eeprom
>but for other upstream devices I am not sure. I will check with my team.
>
>Hi Tushar,
>
>Would you please help to fine the offset of max payload size in eeprom?
>I'd like to have a try to modify it by ethtool.

It is defined using bit 8 of word 0x1A.
Bit value 0 = 128B , bit value 1 = 256B

-Tushar
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