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

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Date:	Tue, 24 Mar 2015 11:04:48 -0400
From:	jacob jacob <opstkusr@...il.com>
To:	Shannon Nelson <shannon.nelson@...el.com>
Cc:	Stefan Assmann <sassmann@...hat.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)

On Tue, Mar 24, 2015 at 10:53 AM, Shannon Nelson
<shannon.nelson@...el.com> wrote:
> On Tue, Mar 24, 2015 at 7:13 AM, jacob jacob <opstkusr@...il.com> wrote:
>> 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
>
> I'm glad the updates helped as we expected.
>
>>
>> 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.
>
> Did you make sure to unbind the i40e device from pci-stub after you
> were done with using it in the VM?

The issue is running dpdk from within the vm itself. Is it possible
that the igb_uio driver needs additional updates/functionality to be
at parity with 1.2.37 version of i40e driver?

>
>> I'll post further updates as i make progress.
>> Thanks for all the help.
>>
>
> Good luck,
> sln
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