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

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Date:	Wed, 28 Nov 2012 16:31:14 +0800
From:	Joe Jin <joe.jin@...cle.com>
To:	Ben Hutchings <bhutchings@...arflare.com>
CC:	"Fujinaka, Todd" <todd.fujinaka@...el.com>,
	Mary Mcgrath <mary.mcgrath@...cle.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>,
	linux-pci <linux-pci@...r.kernel.org>
Subject: Re: [E1000-devel] 82571EB: Detected Hardware Unit Hang

On 11/28/12 02:10, Ben Hutchings wrote:
> On Tue, 2012-11-27 at 17:32 +0000, Fujinaka, Todd wrote:
>> Forgive me if I'm being too repetitious as I think some of this has
>> been mentioned in the past.
>>
>> We (and by we I mean the Ethernet part and driver) can only change the
>> advertised availability of a larger MaxPayloadSize. The size is
>> negotiated by both sides of the link when the link is established. The
>> driver should not change the size of the link as it would be poking at
>> registers outside of its scope and is controlled by the upstream
>> bridge (not us).
> [...]
> 
> MaxPayloadSize (MPS) is not negotiated between devices but is programmed
> by the system firmware (at least for devices present at boot - the
> kernel may be responsible in case of hotplug).  You can use the kernel
> parameter 'pci=pcie_bus_perf' (or one of several others) to set a policy
> that overrides this, but no policy will allow setting MPS above the
> device's MaxPayloadSizeSupported (MPSS).
> 

Ben,

Unfortunately I'm using 3.0.x kernel and this is not included in the kernel.
So I'm trying to use ethtool modify it from eeprom to see if help or no.


Todd, I'll review all MaxPayload for all devices, but need to say if it mismatch,
customer could not modify it from BIOS for there was not entry at there, to
test it, we have to find how to verify if this is the root cause, so still 
need to find the offset in eeprom.

Thanks in advance,
Joe

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