Comment 5 for bug 1892132

Reviewed: https://review.opendev.org/745895
Committed: https://git.openstack.org/cgit/openstack/os-vif/commit/?id=b37de19c58c877f5174d76d0a4ba5ab519f464e8
Submitter: Zuul
Branch: master

commit b37de19c58c877f5174d76d0a4ba5ab519f464e8
Author: Mamduh Alassi <email address hidden>
Date: Wed Aug 12 16:24:47 2020 +0300

    Fix - os-vif fails to get the correct UpLink Representor

    Till kernel 5.7 PF and VF representors are exposed as virtual device.
    They are not linked to its parent PCI device like how uplink
    representor is linked.

    Starting from kernel 5.8 due to new change [1] the PF and VF representors are
    linked to their parent PCI device, and so "get_ifname_by_pci_address" fails
    to get the correct UpLink Representor.

    This patch modifys the behviour of "get_ifname_by_pci_address" to
    check the physical port name of the netdev in
    vf_pci_addr_path/physfn/net to match the formart for the uplink "p\d+".

    [1] https://git.kernel.org/pub/scm/linux/kernel/git/netdev/net.git/commit/?id=123f0f53dd64b67e34142485fe866a8a581f12f1

    Closes-Bug: #1892132
    Change-Id: I49f6ae3f0e6bfbf555c8284bfd70371ce90da0c7