With IXGBEVF driver
0000:41:00.0 / 0000:41:10.0 - eth3 - Intel Corporation 82599 Ethernet Controller Virtual Function (rev 01) - Driver: ixgbevf
0000:41:00.0 / 0000:41:10.2 - eth8 - Intel Corporation 82599 Ethernet Controller Virtual Function (rev 01) - Driver: ixgbevf
0000:41:00.0 / 0000:41:10.4 - eth10 - Intel Corporation 82599 Ethernet Controller Virtual Function (rev 01) - Driver: ixgbevf
0000:41:00.0 / 0000:41:10.6 - eth11 - Intel Corporation 82599 Ethernet Controller Virtual Function (rev 01) - Driver: ixgbevf
0000:41:00.0 / 0000:41:11.0 - eth12 - Intel Corporation 82599 Ethernet Controller Virtual Function (rev 01) - Driver: ixgbevf
0000:41:00.0 / 0000:41:11.2 - eth13 - Intel Corporation 82599 Ethernet Controller Virtual Function (rev 01) - Driver: ixgbevf
0000:41:00.0 / 0000:41:11.4 - eth14 - Intel Corporation 82599 Ethernet Controller Virtual Function (rev 01) - Driver: ixgbevf
0000:41:00.0 / 0000:41:11.6 - eth15 - Intel Corporation 82599 Ethernet Controller Virtual Function (rev 01) - Driver: ixgbevf
0000:42:00.0 - - Intel Corporation Ethernet 10G 2P X520 Adapter (rev 01) - Driver: vfio-pci
0000:42:00.1 - eth9 - Intel Corporation Ethernet 10G 2P X520 Adapter (rev 01) - Driver: ixgbe
root@ubi:/sys/class/net/eth6/device# cd virtfn0/net/eth3/
root@ubi:/sys/class/net/eth6/device/virtfn0/net/eth3# pwd
/sys/class/net/eth6/device/virtfn0/net/eth3
.../virtfn0/net/eth3 is existing
VFIO-PCI driver:
0000:01:00.0 - eth0 - Intel Corporation I350 Gigabit Network Connection (rev 01) - Driver: igb
0000:01:00.1 - eth1 - Intel Corporation I350 Gigabit Network Connection (rev 01) - Driver: igb
0000:01:00.2 - eth2 - Intel Corporation I350 Gigabit Network Connection (rev 01) - Driver: igb
0000:01:00.3 - eth4 - Intel Corporation I350 Gigabit Network Connection (rev 01) - Driver: igb
0000:04:00.0 - - Intel Corporation Ethernet 10G 2P X520 Adapter (rev 01) - Driver: vfio-pci
0000:04:00.1 - eth5 - Intel Corporation Ethernet 10G 2P X520 Adapter (rev 01) - Driver: ixgbe
0000:41:00.0 - eth6 - Intel Corporation Ethernet 10G 2P X520 Adapter (rev 01) - Driver: ixgbe
0000:41:00.1 - eth7 - Intel Corporation Ethernet 10G 2P X520 Adapter (rev 01) - Driver: ixgbe
0000:41:00.0 / 0000:41:10.0 - - Intel Corporation 82599 Ethernet Controller Virtual Function (rev 01) - Driver: vfio-pci
0000:41:00.0 / 0000:41:10.2 - eth8 - Intel Corporation 82599 Ethernet Controller Virtual Function (rev 01) - Driver: ixgbevf
0000:41:00.0 / 0000:41:10.4 - eth10 - Intel Corporation 82599 Ethernet Controller Virtual Function (rev 01) - Driver: ixgbevf
0000:41:00.0 / 0000:41:10.6 - eth11 - Intel Corporation 82599 Ethernet Controller Virtual Function (rev 01) - Driver: ixgbevf
0000:41:00.0 / 0000:41:11.0 - eth12 - Intel Corporation 82599 Ethernet Controller Virtual Function (rev 01) - Driver: ixgbevf
0000:41:00.0 / 0000:41:11.2 - eth13 - Intel Corporation 82599 Ethernet Controller Virtual Function (rev 01) - Driver: ixgbevf
0000:41:00.0 / 0000:41:11.4 - eth14 - Intel Corporation 82599 Ethernet Controller Virtual Function (rev 01) - Driver: ixgbevf
0000:41:00.0 / 0000:41:11.6 - eth15 - Intel Corporation 82599 Ethernet Controller Virtual Function (rev 01) - Driver: ixgbevf
0000:42:00.0 - - Intel Corporation Ethernet 10G 2P X520 Adapter (rev 01) - Driver: vfio-pci
0000:42:00.1 - eth9 - Intel Corporation Ethernet 10G 2P X520 Adapter (rev 01) - Driver: ixgbe
root@ubi:~# ls -lrt /sys/class/net/eth6/device/virtfn0/net/
ls: cannot access /sys/class/net/eth6/device/virtfn0/net/: No such file or directory