Virtio_user as Exception Path insted of rte_kni on virtio driver is possible

Virtio_user as Exception Path insted of rte_kni on virtio driver is possible

[Yasin CANER]

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Hello all,

I would like to run a DPDK application on virtio driver that is in a Ubuntu-20 VM.


  1.  Can DPDK-22.11 create a virtio_user on virtio driver? Or is there a another way to create KNI? I could not create VF .
  2.  Is there a way to run virtio_user as Exception path via igb_uio instead of VFIO?
  3.  Or do i have to run via rte_kni?



I try to follow VFIO guide to create VF but it doesnt work. There is no srvio support in virtio driver as expected.

Best regards.

This parts not possible to run

echo 1 | sudo tee /sys/module/vfio_pci/parameters/enable_sriov

echo 2 > /sys/bus/pci/devices/0000:86:00.0/sriov_numvfs



DPDK version 22.11
Ubuntu 20.04.5
5.4.0-146-generic
https://doc.dpdk.org/guides-22.11/howto/virtio_user_as_exception_path.html#virtio-user-as-exception-path
55. Tun|Tap Poll Mode Driver - Data Plane Development Kit 22.11.1 documentation (dpdk.org)<https://doc.dpdk.org/guides-22.11/nics/tap.html>
https://doc.dpdk.org/guides-22.11/linux_gsg/linux_drivers.html#linux-gsg-linux-drivers
https://docs.kernel.org/driver-api/vfio.html

ethtool -i ens6
driver: virtio_net
version: 1.0.0
firmware-version:
expansion-rom-version:
bus-info: 0000:00:06.0
supports-statistics: yes
supports-test: no
supports-eeprom-access: no
supports-register-dump: no
supports-priv-flags: no


___
Yasin CANER
Lider Mühendis
Ulak Haberleşme A.Ş. Ankara


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Re: Virtio_user as Exception Path insted of rte_kni on virtio driver is possible

[Stephen Hemminger]

On Fri, 7 Apr 2023 13:49:47 +0000
Yasin CANER <yasin.caner@ulakhaberlesme.com.tr> wrote:

> Hello all,
> 
> I would like to run a DPDK application on virtio driver that is in a Ubuntu-20 VM.
> 
> 
>   1.  Can DPDK-22.11 create a virtio_user on virtio driver? Or is there a another way to create KNI? I could not create VF .
>   2.  Is there a way to run virtio_user as Exception path via igb_uio instead of VFIO?
>   3.  Or do i have to run via rte_kni?

Virtio has two sides, the host and guest side. Virtio_user has DPDK place the role of host
and the kernel device is the guest side.  If running in a VM, the usual case is that
the virtio device is managed by the kernel (host side) and the DPDK application is using
the guest side.

> 
> I try to follow VFIO guide to create VF but it doesnt work. There is no srvio support in virtio driver as expected.
> 
> Best regards.
> 
> This parts not possible to run
> 
> echo 1 | sudo tee /sys/module/vfio_pci/parameters/enable_sriov
> 
> echo 2 > /sys/bus/pci/devices/0000:86:00.0/sriov_numvfs

SRIOV VF is a host (not guest VM) side feature.
So the above lines don't make any sense.


> DPDK version 22.11
> Ubuntu 20.04.5
> 5.4.0-146-generic
> https://doc.dpdk.org/guides-22.11/howto/virtio_user_as_exception_path.html#virtio-user-as-exception-path
> 55. Tun|Tap Poll Mode Driver - Data Plane Development Kit 22.11.1 documentation (dpdk.org)<https://doc.dpdk.org/guides-22.11/nics/tap.html>
> https://doc.dpdk.org/guides-22.11/linux_gsg/linux_drivers.html#linux-gsg-linux-drivers
> https://docs.kernel.org/driver-api/vfio.html
> 
> ethtool -i ens6
> driver: virtio_net
> version: 1.0.0
> firmware-version:
> expansion-rom-version:
> bus-info: 0000:00:06.0
> supports-statistics: yes
> supports-test: no
> supports-eeprom-access: no
> supports-register-dump: no
> supports-priv-flags: no
> 

What is kernel log (dmesg) output?