RE: 82571EB: Detected Hardware Unit Hang

-----Original Message-----
From: Joe Jin [mailto:joe.jin@oracle.com]
Sent: Wednesday, November 14, 2012 4:33 PM
To: Dave, Tushar N
Cc: e1000-devel@lists.sf.net; netdev@vger.kernel.org; linux-
kernel@vger.kernel.org; Mary Mcgrath
Subject: Re: 82571EB: Detected Hardware Unit Hang

On 11/14/12 11:45, Dave, Tushar N wrote:

quoted

quoted

-----Original Message-----
From: Joe Jin [mailto:joe.jin@oracle.com]
Sent: Tuesday, November 13, 2012 6:48 PM
To: Dave, Tushar N
Cc: e1000-devel@lists.sf.net; netdev@vger.kernel.org; linux-
kernel@vger.kernel.org; Mary Mcgrath
Subject: Re: 82571EB: Detected Hardware Unit Hang

On 11/09/12 04:35, Dave, Tushar N wrote:

quoted

All devices in path from root complex to 82571, should have *same*
max

payload size otherwise it can cause hang.

quoted

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