linux-kernel - Re: PROBLEM: Intel I210AT NIC resets while using PCI passthrough on ESXi (regression)

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Date:	Tue, 26 Jul 2016 15:49:02 +0200 (CEST)
From:	Thomas Gleixner <tglx@...utronix.de>
To:	Foster Snowhill <forst@...stwoof.ru>
cc:	LKML <linux-kernel@...r.kernel.org>,
	Matthias Prager <linux@...thiasprager.de>,
	Jason Taylor <jason.taylor@...plivity.com>,
	Marc Zyngier <marc.zyngier@....com>
Subject: Re: PROBLEM: Intel I210AT NIC resets while using PCI passthrough on
 ESXi (regression)

On Mon, 25 Jul 2016, Foster Snowhill wrote:
> On 25.07.16 13:56, Thomas Gleixner wrote:
> > On Sat, 23 Jul 2016, Foster Snowhill wrote:
> >> [1.] One line summary of the problem:
> >>
> >> Intel I210AT NIC resets while using PCI passthrough on ESXi (regression)
> >  
> > That has been reported before and so far this has been believed to be a vmware
> > issue. Native hardware and KVM do not expose that. See:
> > 
> >     http://marc.info/?l=linux-kernel&m=145280623530135&w=2
> >     http://marc.info/?l=linux-kernel&m=145879968005421&w=2
> 
> This is indeed the same symptoms I encountered in my case. More than that, I have an LSI 2008 adapter which is also being passed through in the same manner as the NIC, absolutely the same problem there too. Before doing the bisect I considered it a separate issue and planned to work on it later.
> 
> > Could you please give the patch below a try? It might be related, but I'm not
> > sure whether it will cure that particular vmware oddity.
> 
> Patch fixed the issue for me. Did 4-5 reboots just to be sure, all working properly, no adapter resets. Just for the sake of experiment built a clean 4.7 kernel without the patch, issue still present there as expected.
> 

Can you please test something else with that patch?

After starting the NIC, can you please shutdown the interface, so the
interrupt gets shutdown as well. (It should vanish from /proc/interrupts).

Does that work correctly?

Thanks,

	tglx