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

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Message-ID: <30a1b076-dc4f-045a-3838-293be9e01c65@forstwoof.ru>
Date:	Tue, 26 Jul 2016 17:27:10 +0300
From:	Foster Snowhill <forst@...stwoof.ru>
To:	Thomas Gleixner <tglx@...utronix.de>
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 26.07.16 17:06, Thomas Gleixner wrote:
> On Tue, 26 Jul 2016, Foster Snowhill wrote:
>> On 26.07.16 16:49, Thomas Gleixner wrote:
>>> On Mon, 25 Jul 2016, Foster Snowhill wrote:
>>>> On 25.07.16 13:56, Thomas Gleixner wrote:
>>>>> 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 reenabling work or does that result in a stall again?

Works.

root@...ntutest ~ # ifup ens224
Waiting for DAD... Done
root@...ntutest ~ # ping -s 1000 -n ya.ru
PING YA.ru (213.180.204.3) 1000(1028) bytes of data.
1008 bytes from 213.180.204.3: icmp_seq=1 ttl=57 time=2.97 ms
1008 bytes from 213.180.204.3: icmp_seq=2 ttl=57 time=2.85 ms
1008 bytes from 213.180.204.3: icmp_seq=3 ttl=57 time=2.87 ms
1008 bytes from 213.180.204.3: icmp_seq=4 ttl=57 time=2.92 ms
^C
--- YA.ru ping statistics ---
4 packets transmitted, 4 received, 0% packet loss, time 3004ms
rtt min/avg/max/mdev = 2.851/2.904/2.976/0.072 ms
root@...ntutest ~ # grep ens224 /proc/interrupts
  60:          3   PCI-MSI 9961472-edge      ens224
  61:       1686   PCI-MSI 9961473-edge      ens224-rx-0
  62:        890   PCI-MSI 9961474-edge      ens224-tx-0