linux-kernel - Re: [E1000-devel] 3.11-rc4 ixgbevf: endless "Last Request of type 00 to PF Nacked" messages

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Message-ID: <CAErSpo7m=YB=1cHSBTwufTHAiAd+k9Re2s-ro509BELOgK8j7Q@mail.gmail.com>
Date:	Fri, 23 Aug 2013 10:52:45 -0600
From:	Bjorn Helgaas <bhelgaas@...gle.com>
To:	"Skidmore, Donald C" <donald.c.skidmore@...el.com>
Cc:	"e1000-devel@...ts.sourceforge.net" 
	<e1000-devel@...ts.sourceforge.net>,
	"linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Don Dutile <ddutile@...hat.com>
Subject: Re: [E1000-devel] 3.11-rc4 ixgbevf: endless "Last Request of type 00
 to PF Nacked" messages

On Tue, Aug 20, 2013 at 5:37 PM, Bjorn Helgaas <bhelgaas@...gle.com> wrote:
> On Tue, Aug 20, 2013 at 5:08 PM, Bjorn Helgaas <bhelgaas@...gle.com> wrote:
>> On Tue, Aug 13, 2013 at 8:23 PM, Bjorn Helgaas <bhelgaas@...gle.com> wrote:
>
>>> I played with this a little more and found this:
>>>
>>> 1) Magma card in z420, connected to chassis containing X540: fails
>>> (original report)
>>> 2) X540 in z420, Magma card in z420, connected to empty chassis: fails
>>> 3) X540 in z420, Magma card in z420 but no cable to chassis: works
>
> For what it's worth, I tried config 3 again with v3.11-rc6, and it
> failed the same way.  I haven't bothered with config 2.  It's not 100%
> reproducible, but at least it doesn't seem related to the expansion
> chassis.
>
> I attached the logs from config 3 to
> https://bugzilla.kernel.org/show_bug.cgi?id=60776

Is there anything I can do to help debug this?  Add instrumentation,
etc.?  It seems like I'm doing the simplest possible thing -- just
writing to the sysfs sriov_num_vfs file to enable VFs.

I almost think it must be related to my config somehow if nobody else
is seeing this, but at the same time, my config also seems the
simplest possible, so I don't know what I could be doing that's
unusual.

Bjorn
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