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Bug 1980387 - [RFE] NetworkManager ignores rd.znet_ifname kernel command line option on s390x
Summary: [RFE] NetworkManager ignores rd.znet_ifname kernel command line option on s390x
Keywords:
Status: CLOSED ERRATA
Alias: None
Product: Red Hat Enterprise Linux 9
Classification: Red Hat
Component: NetworkManager
Version: 9.0
Hardware: Unspecified
OS: Unspecified
high
unspecified
Target Milestone: beta
: ---
Assignee: Lubomir Rintel
QA Contact: Filip Pokryvka
Marc Muehlfeld
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2021-07-08 14:25 UTC by Filip Pokryvka
Modified: 2022-05-17 16:07 UTC (History)
9 users (show)

Fixed In Version: NetworkManager-1.36.0-0.7.el9
Doc Type: Enhancement
Doc Text:
.NetworkManager supports interface names set in the `rd.znet_ifname` kernel option on IBM Z With this enhancement, on the IBM Z platform, NetworkManager now interprets the `rd.znet` and `rd.znet_ifname` kernel command-line options when installing or booting Red Hat Enterprise Linux from the network. As a result, it is possible to specify a name of a network interface identified by the subchannels instead of the default one.
Clone Of:
Environment:
Last Closed: 2022-05-17 15:48:15 UTC
Type: Bug
Target Upstream Version:
Embargoed:

Attachments (Terms of Use)


Links
System ID Private Priority Status Summary Last Updated
Red Hat Product Errata RHBA-2022:3915 0 None None None 2022-05-17 15:48:28 UTC

Description Filip Pokryvka 2021-07-08 14:25:10 UTC 
Description of problem:
rd.znet_ifname command line option is currently ignored by NetworkManger initrd generator. According to `man dracut.cmdline`, it renames interface with matching subchannels. NetworkManager should not use predictable name in that case and map rd.znet option accordingly.

Version-Release number of selected component (if applicable):
1.32.0-1.el9

How reproducible:
always

Steps to Reproduce:
/usr/libexec/nm-initrd-generator -s -- rd.znet=qeth,0.0.0600,0.0.0601,0.0.0602,layer2=1,portname=foo rd.znet_ifname=eth0:0.0.0600,0.0.0601,0.0.0602 ip=eth0:auto

Actual results:
Connection for eth0 is generated, but does not have s390-options and s390-subchannels set.

Expected results:
Connection for eth0 should have s390-options and s390-subchannels set (as if ip=enc600:auto was used instead of eth0).

Additional info:
replacing rd.znet_ifname=eth0:0.0.0600,0.0.0601,0.0.0602 by net.ifnames=0 works (however only if eth0 is desired name, otherwise it does not work).
Comment 1 Gris Ge 2021-07-14 06:07:07 UTC 
Hi Beniamino,

Can NetworkManager rename a interface in this use case?
Comment 2 Beniamino Galvani 2021-07-14 07:16:11 UTC 
(In reply to Gris Ge from comment #1)
> Can NetworkManager rename a interface in this use case?

Note that here "rename" doesn't mean that NetworkManager changes the link name, because that is already done by the 'znet' dracut module using a udev rule.

What NM should do is to generate a connection using the name from `rd.znet_ifname` instead of building the name according to subchannels and other properties from 'rd.znet'.

This is a missing feature and can be implemented.
Comment 7 Thomas Haller 2022-01-26 21:57:46 UTC 
https://gitlab.freedesktop.org/NetworkManager/NetworkManager/-/commit/68f500f5cee9c784fda4399e0839fc9b705457a4
Comment 8 Thomas Haller 2022-01-26 22:04:31 UTC 
the code comes with a unit test, which looks sensible, runs and passes.
I didn't test an actual boot, due to the effort of piecing initrd together.
But the initrd generator appears to work as intended.

Marking pre-verified.
Comment 11 Filip Pokryvka 2022-02-17 10:00:31 UTC 
This is covered by unit tests of nm-initrd-generator utility. I have checked manually and works fine now, connection is matched by rd.znet_ifname option.
Comment 18 errata-xmlrpc 2022-05-17 15:48:15 UTC 
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 (new packages: NetworkManager), 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-2022:3915
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