linux-kernel - Re: [E1000-devel] 82571EB: Detected Hardware Unit Hang

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Date:	Tue, 27 Nov 2012 08:59:35 +0800
From:	Joe Jin <joe.jin@...cle.com>
To:	"Fujinaka, Todd" <todd.fujinaka@...el.com>
CC:	"Dave, Tushar N" <tushar.n.dave@...el.com>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"e1000-devel@...ts.sf.net" <e1000-devel@...ts.sf.net>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Mary Mcgrath <mary.mcgrath@...cle.com>
Subject: Re: [E1000-devel] 82571EB: Detected Hardware Unit Hang

On 11/27/12 00:23, Fujinaka, Todd wrote:
> If you look at the previous section, DevCap, you'll see that it's
> correctly advertising 256 bytes but the system is negotiating 128 for
> the link to the Ethernet controller. Things on the "other" side of the
> link are controlled outside of the e1000 driver.
> 
> Tushar's first suggestion was to check the PCIe payload settings in the
> entire chain. Have you done that? Mismatches will cause hangs.

Hi Todd,

So far I had to know how to modify the maxpayload size, since BIOS have not
entry to change this, so I had to use ethtool, now I need to get the offset
of MaxPayload size in eeprom, I ever tried to find from Intel online document
but failed, any idea?

Thanks in advance,
Joe
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