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Description of problem:
I can up infiniband device mlx5_ib0 but not any of it's ports (e.g. mlx5_ib0.8002). This worked in 7.3 correctly, this works correctly even with the latest NM and kernel from 7.3 (514)

Version-Release number of selected component (if applicable):
kernel-3.10.0-693.2.1.el7.x86_64
NetworkManager-1.8.0-10.el7_4.x86_64

How reproducible:
always

Steps to Reproduce:
1.try to up ininiband port

Actual results:
device seems to be connected but NM time outs and says device is still down.

Expected results:
everything should work as before, connection upped, device connected, etc

Additional info:

There are multiple causes of the failures:

 - with RHEL 7.4 kernel NM sometimes fails to delete infiniband
   partitions. It is not clear yet if this is a kernel bug. In NM logs
   there are messages like: "Failed to remove InfiniBand P_Key
   interface 'inf_ib0.8002': unspecified". This alone does not cause
   a test failure.

 - there is a bug in NM that disables all property notifications for a
   device when the situation above happens; as a consequence clients
   have a wrong view of the device state and don't detect the
   successful activation. This is fixed upstream in commit [1].

Currently I'm investigating the first point; anyway I think that the
NM commit should be backported to 7.4 z-stream.

[1] https://cgit.freedesktop.org/NetworkManager/NetworkManager/commit/?id=24a7f88bc56b66745c1e6b9444df8a80125de059

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHBA-2018:0778