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[Launchpad Bug Tracker <1800877@xxxxxxxxxxxxxxxxxx>]

This bug was fixed in the package iproute2 - 4.3.0-1ubuntu3.16.04.4

---------------
iproute2 (4.3.0-1ubuntu3.16.04.4) xenial; urgency=medium

  * Add support for VF Trust (LP: #1800877)
    - d/p/1008-vf_trust_dddf1b44126e.patch: netlink attribute
    - d/p/1009-vf_trust_b6d77d9ee312.patch: set it for kernel
    - d/p/1010-vf_trust_fe9322781e63.patch: print it for user

 -- Mauricio Faria de Oliveira <mfo@xxxxxxxxxxxxx>  Tue, 18 Sep 2018
12:21:44 -0300

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

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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:
  Fix Released

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.

   * Upstream commits:
   https://git.kernel.org/pub/scm/network/iproute2/iproute2.git/commit/?id=dddf1b44126e
  https://git.kernel.org/pub/scm/network/iproute2/iproute2.git/commit/?id=fe9322781e63
  https://git.kernel.org/pub/scm/network/iproute2/iproute2.git/commit/?id=b6d77d9ee312

   * Only affect Xenial release :

   # rmadison iproute2
   iproute2 | 4.3.0-1ubuntu3.16.04.3 | xenial-updates
   iproute2 | 4.15.0-2ubuntu1        | bionic         
   iproute2 | 4.18.0-1ubuntu2        | cosmic        
   iproute2 | 4.18.0-1ubuntu2        | disco  

   # iproute2 upstream vcs

   $ git describe --contains dddf1b44126e
   v4.4.0~67

   $ git describe --contains b6d77d9ee312
   v4.5.0~47

   $ git describe --contains fe9322781e63
   v4.6.0~32

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