[Bug 1806153] [NEW] ifupdown cannot create VLAN subinterface on an Infiniband-capable port running in Ethernet mode

[Mike Joseph]

Public bug reported:

A bug exists in ifupdown which incorrectly identifies Infiniband-capable
interfaces running in Ethernet mode as Infiniband interfaces.  This
causes the creation of VLANs to fail with an error such as:

/bin/sh: 1: cannot create /sys/class/net/eth0/create_child: Permission
denied

The defect appears to be fixed upstream in Debian:

https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=857976

However, it doesn't look like Ubuntu 18.04 includes the fix, as the
version of ifupdown is 0.8.17ubuntu1.1, while upstream fixed it 0.8.27.
By shipping 18.04 without this fix, all users of such NICs (such as
Mellanox ConnectX-3 series) are unable to create VLANs with ifupdown.
Therefore, I request that this fix be implemented as a bugfix in 18.04.

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

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https://bugs.launchpad.net/bugs/1806153

Title:
  ifupdown cannot create VLAN subinterface on an Infiniband-capable port
  running in Ethernet mode

Status in ifupdown package in Ubuntu:
  New

Bug description:
  A bug exists in ifupdown which incorrectly identifies Infiniband-
  capable interfaces running in Ethernet mode as Infiniband interfaces.
  This causes the creation of VLANs to fail with an error such as:

  /bin/sh: 1: cannot create /sys/class/net/eth0/create_child: Permission
  denied

  The defect appears to be fixed upstream in Debian:

  https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=857976

  However, it doesn't look like Ubuntu 18.04 includes the fix, as the
  version of ifupdown is 0.8.17ubuntu1.1, while upstream fixed it
  0.8.27.  By shipping 18.04 without this fix, all users of such NICs
  (such as Mellanox ConnectX-3 series) are unable to create VLANs with
  ifupdown.  Therefore, I request that this fix be implemented as a
  bugfix in 18.04.

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