linux-kernel - Re: 82571EB: Detected Hardware Unit Hang

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Date:	Mon, 16 Jul 2012 16:47:25 +0100
From:	Ben Hutchings <bhutchings@...arflare.com>
To:	Henrique de Moraes Holschuh <hmh@....eng.br>
CC:	"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 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.

Ben.

-- 
Ben Hutchings, Staff Engineer, Solarflare
Not speaking for my employer; that's the marketing department's job.
They asked us to note that Solarflare product names are trademarked.

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