netdev - Re: [Qemu-devel] PCI passthrough of 40G ethernet interface (Openstack/KVM)

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Date:	Tue, 24 Mar 2015 10:13:44 -0400
From:	jacob jacob <opstkusr@...il.com>
To:	Stefan Assmann <sassmann@...hat.com>
Cc:	Shannon Nelson <shannon.nelson@...el.com>,
	Bandan Das <bsd@...hat.com>,
	Alex Williamson <alex.williamson@...hat.com>,
	QEMU Developers <qemu-devel@...gnu.org>,
	kvm-devel <kvm@...r.kernel.org>, netdev@...r.kernel.org
Subject: Re: [Qemu-devel] PCI passthrough of 40G ethernet interface (Openstack/KVM)

After update to latest firmware and using version 1.2.37 of i40e
driver, things are looking better with PCI passthrough.

]# ethtool -i eth3
driver: i40e
version: 1.2.37
firmware-version: f4.33.31377 a1.2 n4.42 e1930
bus-info: 0000:00:07.0
supports-statistics: yes
supports-test: yes
supports-eeprom-access: yes
supports-register-dump: yes
supports-priv-flags: yes

There are still issues running dpdk 1.8.0 from the VM using the pci
passthrough devices and looks like it puts the devices in a bad state.
i40e driver will not bind after this happens and a host reboot is
required to recover.
I'll post further updates as i make progress.
Thanks for all the help.

On Mon, Mar 23, 2015 at 3:19 AM, Stefan Assmann <sassmann@...hat.com> wrote:
> On 20.03.2015 21:55, jacob jacob wrote:
>> On Thu, Mar 19, 2015 at 10:18 AM, Stefan Assmann <sassmann@...hat.com> wrote:
>>> On 19.03.2015 15:04, jacob jacob wrote:
>>>> Hi Stefan,
>>>> have you been able to get PCI passthrough working without any issues
>>>> after the upgrade?
>>>
>>> My XL710 fails to transfer regular TCP traffic (netperf). If that works
>>> for you then you're already one step ahead of me. Afraid I can't help
>>> you there.
>>
>> I have data transfer working when trying the test runs on the host
>> itself. Are you seeing problems when directly trying the TCP traffic
>> from the host itself?
>
> Correct.
>
>> The issues that i am seeing are specific to the case when the devices
>> are passed via PCI passthrough into the VM.
>>
>> Any ideas whether this would be a kvm/qemu or i40e driver issue?
>> (Updating to the latest firmware and using latest i40e driver didn't
>> seem to help.)
>
> Hard to say, that's probably something for Intel to look into.
>
>   Stefan
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