netdev - Re: 82571EB: Detected Hardware Unit Hang

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Date:	Mon, 16 Jul 2012 21:48:56 -0700
From:	Jon Mason <jdmason@...zu.us>
To:	Henrique de Moraes Holschuh <hmh@....eng.br>
Cc:	Ben Hutchings <bhutchings@...arflare.com>,
	"Dave, Tushar N" <tushar.n.dave@...el.com>,
	Joe Jin <joe.jin@...cle.com>,
	"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>
Subject: Re: 82571EB: Detected Hardware Unit Hang

On Mon, Jul 16, 2012 at 9:08 AM, Henrique de Moraes Holschuh
<hmh@....eng.br> wrote:
> On Mon, 16 Jul 2012, Ben Hutchings wrote:
>> On Sun, 2012-07-15 at 10:35 -0300, Henrique de Moraes Holschuh wrote:
>> > On Sun, 15 Jul 2012, Dave, Tushar N wrote:
>> > > Somehow setting max payload to 256 from BIOS does not set this value for all devices. I believe this is a BIOS bug.
>> >
>> > And preferably, Linux should complain about it.  Since we know it is going
>> > to cause problems, and since we know it does happen, we should be raising a
>> > ruckus about it in the kernel log (and probably fixing it to min(path) while
>> > at it)...
>> >
>> > Is this something that should be raised as a feature request with the
>> > PCI/PCIe subsystem?
>>
>> The feature is there, but we ended up with:
>>
>> commit 5f39e6705faade2e89d119958a8c51b9b6e2c53c
>> Author: Jon Mason <mason@...i.com>
>> Date:   Mon Oct 3 09:50:20 2011 -0500
>>
>>     PCI: Disable MPS configuration by default
>>
>> But you are welcome to share use of the fixup_mpss_256() quirk.
>
> Meh.  I'd be happy with a warning if MPSS decreases when walking up to
> the tree root... i.e. a warning if any child has a MPSS larger than the
> parent.

You can add "pci=pcie_bus_safe" to the kernel params and it should
resolve your issue.

> --
>   "One disk to rule them all, One disk to find them. One disk to bring
>   them all and in the darkness grind them. In the Land of Redmond
>   where the shadows lie." -- The Silicon Valley Tarot
>   Henrique Holschuh
> --
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