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Originally and on RHEL-7.1, we detected s390 CTC devices like:

        if (arptype == 256) {
            /* Some s390 CTC-type devices report 256 for the encapsulation type
             * for some reason, but we need to call them Ethernet. FIXME: use
             * something other than interface name to detect CTC here.
             */
            if (g_str_has_prefix (ifname, "ctc"))
                return_type (NM_LINK_TYPE_ETHERNET, "ethernet");
        }



Bug 1212118 and upstream commit [1] implemented better device detection for s390 CTC devices.


This was later broken entirely due to commit [2].



[1] http://cgit.freedesktop.org/NetworkManager/NetworkManager/commit/?id=02c6a9334335d3ef32c6cc8fafc6cea235c80ffc

[2] http://cgit.freedesktop.org/NetworkManager/NetworkManager/commit/?id=ddaea22332907c05222cbec1e1b4365689fbda9f

This is fixed upstream:

master: http://cgit.freedesktop.org/NetworkManager/NetworkManager/commit/?id=8a6afe92c18dfefa91d057518be00b0127720fa5

nm-1-0: http://cgit.freedesktop.org/NetworkManager/NetworkManager/commit/?id=2a8c93e940c3fdc5bb710f9fd1ec037e51524ed9





RHEL-7.1 would detect CTC devices based on the interface name.

RHEL-7.2 would not detect them properly at all.
This is a regression.


Propose backporting the trivial fix.

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://rhn.redhat.com/errata/RHSA-2015-2315.html