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+++ This bug was initially created as a clone of Bug #2086869 +++

Description of problem:

This is more like the RFE than an bugfix. The following are the sub-tasks:

1. Add the infiniband setting description, the integration test.
2. Improve the infiniband setting validation.
3. Change the default value of `p_key` setting.

--- Additional comment from Rich Megginson on 2022-05-16 18:02:22 UTC ---

We will also need to add `--skip-tags tests::infiniband` to our downstream CI tests.

Ran tests_infiniband_nm.yml on an RHEL9.1 control host, target RHEL7.9, 8.6, 8.7, 9.0, 9.1 as managed host, detailed logging can be found in the attachment

The feature itself is good. But there's an issue about the test playbook. When running the test playbook against an RHEL7.9 node, the mode/pkey of Infiniband cannot be found in the output of "ip" command, so that the testplaybook will fail in this case, but the configuration is fine. We only need to check the mode and pkey of interface by using "cat /sys/class/net/ib0.000a/pkey" and "cat /sys/class/net/ib0.000a/mode". 

I've attached the modified test playbook for your reference. 

Mark this as VERIFIED as the feature is good. I'll open another bug to track the test playbook issue.

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 (rhel-system-roles bug fix and enhancement update), 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/RHEA-2022:8117