Public bug reported:

Hi,

I have a Chelsio T62100-LP-CR and I'm trying to create a libvirt VM that
gets a VF from the NIC.

The following XML is used :

    <interface type='hostdev' managed='yes'>
      <mac address='52:54:00:ce:f8:e7'/>
      <source>
        <address type='pci' domain='0x0000' bus='0x21' slot='0x01' 
function='0x4'/>
      </source>
      <address type='pci' domain='0x0000' bus='0x02' slot='0x00' 
function='0x0'/>
    </interface>

When starting the VM, libvirt fails with the following :
ubuntu@lubbock:~$ sudo virsh start vmaxino
error: Failed to start domain vmaxino
error: internal error: couldn't find IFLA_VF_INFO for VF 1 in netlink response

This is similar to bug 1496942.

I can create the VM with the VF if I pass it as a <hostdev> like this :
    <hostdev mode='subsystem' type='pci' managed='yes'>
      <source>
        <address domain='0x0000' bus='0x21' slot='0x01' function='0x4'/>
      </source>
      <address type='pci' domain='0x0000' bus='0x02' slot='0x00' 
function='0x0'/>
    </hostdev>

More info :
ubuntu@lubbock:~$ sudo virsh nodedev-dumpxml pci_0000_21_01_4
<device>
  <name>pci_0000_21_01_4</name>
  <path>/sys/devices/pci0000:20/0000:20:03.1/0000:21:01.4</path>
  <parent>pci_0000_20_03_1</parent>
  <driver>
    <name>vfio-pci</name>
  </driver>
  <capability type='pci'>
    <domain>0</domain>
    <bus>33</bus>
    <slot>1</slot>
    <function>4</function>
    <product id='0x6807'>T62100-LP-CR Unified Wire Ethernet Controller 
[VF]</product>
    <vendor id='0x1425'>Chelsio Communications Inc</vendor>
    <capability type='phys_function'>
      <address domain='0x0000' bus='0x21' slot='0x00' function='0x0'/>
    </capability>
    <iommuGroup number='138'>
      <address domain='0x0000' bus='0x21' slot='0x01' function='0x4'/>
    </iommuGroup>
    <numa node='2'/>
    <pci-express>
      <link validity='cap' port='0' speed='8' width='16'/>
      <link validity='sta' width='0'/>
    </pci-express>
  </capability>
</device>

pcap of netlink exchange is attached.

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: linux-image-4.15.0-46-generic 4.15.0-46.49
ProcVersionSignature: User Name 4.15.0-46.49-generic 4.15.18
Uname: Linux 4.15.0-46-generic x86_64
AlsaDevices:
 total 0
 crw-rw---- 1 root audio 116,  1 Mar 21 15:42 seq
 crw-rw---- 1 root audio 116, 33 Mar 21 15:42 timer
AplayDevices: Error: [Errno 2] No such file or directory: 'aplay': 'aplay'
ApportVersion: 2.20.9-0ubuntu7.6
Architecture: amd64
ArecordDevices: Error: [Errno 2] No such file or directory: 'arecord': 'arecord'
AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/seq', 
'/dev/snd/timer'] failed with exit code 1:
Date: Thu Mar 21 16:16:41 2019
IwConfig: Error: [Errno 2] No such file or directory: 'iwconfig': 'iwconfig'
MachineType: Supermicro AS -2023US-TR4
PciMultimedia:
 
ProcEnviron:
 TERM=screen-256color
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=C.UTF-8
 SHELL=/bin/bash
ProcFB: 0 astdrmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.15.0-46-generic 
root=UUID=7a2aa06e-2ea8-451c-9b77-e0c5cdc445ce ro console=ttyS1,115200 nosplash 
iommu=pt amd_iommu=on processor.max_cstate=0 l1tf=full cpuidle.off=1
RelatedPackageVersions:
 linux-restricted-modules-4.15.0-46-generic N/A
 linux-backports-modules-4.15.0-46-generic  N/A
 linux-firmware                             1.173.3
RfKill: Error: [Errno 2] No such file or directory: 'rfkill': 'rfkill'
SourcePackage: linux
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 10/04/2018
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: 1.1c
dmi.board.asset.tag: To be filled by O.E.M.
dmi.board.name: H11DSU-iN
dmi.board.vendor: Supermicro
dmi.board.version: 1.02A
dmi.chassis.asset.tag: To be filled by O.E.M.
dmi.chassis.type: 1
dmi.chassis.vendor: Supermicro
dmi.chassis.version: 0123456789
dmi.modalias: 
dmi:bvnAmericanMegatrendsInc.:bvr1.1c:bd10/04/2018:svnSupermicro:pnAS-2023US-TR4:pvr0123456789:rvnSupermicro:rnH11DSU-iN:rvr1.02A:cvnSupermicro:ct1:cvr0123456789:
dmi.product.family: To be filled by O.E.M.
dmi.product.name: AS -2023US-TR4
dmi.product.version: 0123456789
dmi.sys.vendor: Supermicro

** Affects: linux (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug bionic

** Attachment added: "pcap of netlink exchange"
   https://bugs.launchpad.net/bugs/1821205/+attachment/5248235/+files/pcap.bz2

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https://bugs.launchpad.net/bugs/1821205

Title:
  "couldn't find IFLA_VF_INFO for VF 1 in netlink response" when trying
  to start libvirt VM with Chelsio VF

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