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[Eric Desrochers <eric.desrochers@xxxxxxxxxxxxx>]

** Also affects: iproute2 (Ubuntu Xenial)
   Importance: Undecided
       Status: New

** Changed in: iproute2 (Ubuntu)
       Status: New => Fix Released

** Changed in: iproute2 (Ubuntu Xenial)
       Status: New => In Progress

** Changed in: iproute2 (Ubuntu Xenial)
   Importance: Undecided => Medium

** Changed in: iproute2 (Ubuntu Xenial)
     Assignee: (unassigned) => Mauricio Faria de Oliveira (mfo)

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https://bugs.launchpad.net/bugs/1800877

Title:
  iproute2/xenial: Add support for the VF Trust setting (fix IPv6
  multicast under SR-IOV on Mellanox adapters)

Status in iproute2 package in Ubuntu:
  Fix Released
Status in iproute2 source package in Xenial:
  In Progress

Bug description:
  [Impact]

   * An VM's VF cannot receive IPv6 multicast traffic
     from other VMs' VFs in the same Mellanox adapter
     _if_ its VF trust setting is not enabled, and on
     Xenial currently iproute2 _cannot_ enable it.

   * This breaks IPv6 NDP (Neighbor Discovery Protocol)
     in that scenario.

   * This upload adds three iproute2 upstream commits
     to enable/disable the VF setting, which resolves
     that problem/limitation.

  [Test Case]

   * Check 'ip link help' for the 'trust' option:

     Before:

       # ip link help 2>&1 | grep trust
       <nothing>

     After:

       # ip link help 2>&1 | grep trust
       [ trust { on | off} ] ]

   * Check 'ip link show dev PF' for 'trust on|off' field in VFs.

     Before: (trust field _is not_ present)

       # ip link show dev ens1f0
       ...
       vf 0 MAC 00:00:00:00:00:00, spoof checking on, link-state auto
       vf 1 MAC 00:00:00:00:00:00, spoof checking on, link-state auto

     After: (trust field _is_ present)

       # ip link show dev ens1f0
       ...
       vf 0 MAC 00:00:00:00:00:00, spoof checking on, link-state auto, trust off
       vf 1 MAC 00:00:00:00:00:00, spoof checking on, link-state auto, trust off

   * Set the VF trust on/off and check it:

       Set VF 0 trust on:

       # ip link set ens1f0 vf 0 trust on
       # ip link show dev ens1f0 | grep trust
       vf 0 MAC 00:00:00:00:00:00, spoof checking on, link-state auto, trust on
       vf 1 MAC 00:00:00:00:00:00, spoof checking on, link-state auto, trust off

       Set VF 0 trust off:

       # ip link set ens1f0 vf 0 trust off
       # ip link show dev ens1f0 | grep trust
       vf 0 MAC 00:00:00:00:00:00, spoof checking on, link-state auto, trust off
       vf 1 MAC 00:00:00:00:00:00, spoof checking on, link-state auto, trust off

  [Regression Potential]

   * Regression potential is low because the commits just add the
     netlink attribute for the userspace-kernel interface and the
     ways to set/clear it, and show the current value to the user.

   * Regressions could happen _if_ the user turns the setting on
     (it's disabled by default) and there's a problem/bug likely
     in _other_ component that depends on that setting (which is
     something to fix on such component).

  [Other Info]
   
   * The users that reported this problem have verified
     the test package with these changes, and confirmed
     that it now works correctly for IPv6 NDP/multicast.

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