------- Comment From vineeth.vija...@ibm.com 2021-03-31 02:13 EDT-------
Tested on focal.
---------------

dpkg -l | grep s390-tools
ii  s390-tools                           2.12.0-0ubuntu3.3                 
s390x        fundamental utilities for Linux on z Systems
ii  s390-tools-signed                    2.12.0-0ubuntu3.3                 
s390x        Signed zipl stage3.bin
root@m35lp41:~#
root@m35lp41:~#
root@m35lp41:~#  cat /proc/version
Linux version 5.4.0-70-generic (buildd@bos02-s390x-010) (gcc version 9.3.0 
(Ubuntu 9.3.0-17ubuntu1~20.04)) #78-Ubuntu SMP Fri Mar 19 13:25:37 UTC 2021
root@m35lp41:~# cat /sys/devices/qeth/0.0.bd00/buffer_count
64
root@m35lp41:~# chzdev qeth bd00 -p layer2=1 buffer_count=128
Configuring devices in the persistent configuration only
QETH device 0.0.bd00:0.0.bd01:0.0.bd02 configured
Note: The initial RAM-disk must be updated for these changes to take effect:
- QETH device 0.0.bd00:0.0.bd01:0.0.bd02
update-initramfs: Generating /boot/initrd.img-5.4.0-70-generic
Using config file '/etc/zipl.conf'
Building bootmap in '/boot'
Adding IPL section 'ubuntu' (default)
Preparing boot device: dasda (af8a).
Done.
root@m35lp41:~# cat /sys/devices/qeth/0.0.bd00/buffer_count
64
root@m35lp41:~# reboot
----
Welcome to Ubuntu 20.04.2 LTS (GNU/Linux 5.4.0-70-generic s390x)

* Documentation:  https://help.ubuntu.com
* Management:     https://landscape.canonical.com
* Support:        https://ubuntu.com/advantage

System information as of Wed 31 Mar 2021 06:12:05 AM UTC

System load:  0.38              Processes:                212
Usage of /:   6.7% of 20.18GB   Users logged in:          0
Memory usage: 2%                IPv4 address for encbd00: 172.18.60.41
Swap usage:   0%

0 updates can be installed immediately.
0 of these updates are security updates.

**************************************************************
*                                                            *
*                The system was installed using              *
*                           TESSIA                           *
* Task Execution Supporter and System Installation Assistant *
*                                                            *
* Open source repo: https://gitlab.com/tessia-project        *
* (GitHub mirror: https://github.com/tessia-project)         *
*                                                            *
* Documentation is located here:                             *
* https://gitlab.com/tessia-project/tessia/-/tree/master/doc *
*                                                            *
* To create custom templates for auto installation see:      *
* > tess autotemplate add --help                             *
*                                                            *
**************************************************************

Last login: Wed Mar 31 06:07:43 2021 from 172.18.0.1
root@m35lp41:~#
root@m35lp41:~#
root@m35lp41:~# cat /sys/devices/qeth/0.0.bd00/buffer_count
128
---

And looks good.
Thank you for the fix.

------- Comment From vineeth.vija...@ibm.com 2021-03-31 02:44 EDT-------
Tested on Groovy
----------------

root@m35lp41:~# dpkg -l | grep s390-tools
ii  s390-tools                           2.14.0-1ubuntu1.2                 
s390x        fundamental utilities for Linux on z Systems
ii  s390-tools-signed                    2.14.0-1ubuntu1.2                 
s390x        Signed zipl stage3.bin
root@m35lp41:~#
root@m35lp41:~#  cat /proc/version
Linux version 5.8.0-48-generic (buildd@bos02-s390x-020) (gcc (Ubuntu 
10.2.0-13ubuntu1) 10.2.0, GNU ld (GNU Binutils for Ubuntu) 2.35.1) #54-Ubuntu 
SMP Fri Mar 19 14:18:31 UTC 2021
root@m35lp41:~#  cat /sys/devices/qeth/0.0.bd00/buffer_count
64
root@m35lp41:~# chzdev qeth bd00 -p layer2=1 buffer_count=128
Configuring devices in the persistent configuration only
QETH device 0.0.bd00:0.0.bd01:0.0.bd02 configured
Note: The initial RAM-disk must be updated for these changes to take effect:
- QETH device 0.0.bd00:0.0.bd01:0.0.bd02
update-initramfs: Generating /boot/initrd.img-5.8.0-48-generic
Using config file '/etc/zipl.conf'
Building bootmap in '/boot'
Adding IPL section 'ubuntu' (default)
Preparing boot device: dasda (af8a).
Done.
root@m35lp41:~# cat /sys/devices/qeth/0.0.bd00/buffer_count
64
root@m35lp41:~# reboot
packet_write_wait: Connection to UNKNOWN port 65535: Broken pipe
[vineeth.vijayan@oc6887364776 ~]$ ssh m35lp41.lnxne.boe
channel 0: open failed: connect failed: Connection refused
stdio forwarding failed
ssh_exchange_identification: Connection closed by remote host
[vineeth.vijayan@oc6887364776 ~]$ ssh m35lp41.lnxne.boe
channel 0: open failed: connect failed: Connection refused
stdio forwarding failed
ssh_exchange_identification: Connection closed by remote host
[vineeth.vijayan@oc6887364776 ~]$ ssh m35lp41.lnxne.boe
r...@m35lp41.lnxne.boe's password:
Welcome to Ubuntu 20.10 (GNU/Linux 5.8.0-48-generic s390x)

* Documentation:  https://help.ubuntu.com
* Management:     https://landscape.canonical.com
* Support:        https://ubuntu.com/advantage

System information as of Wed Mar 31 06:43:14 AM UTC 2021

System load:  0.31              Processes:                207
Usage of /:   6.9% of 20.18GB   Users logged in:          0
Memory usage: 2%                IPv4 address for encbd00: 172.18.60.41
Swap usage:   0%

0 updates can be installed immediately.
0 of these updates are security updates.

**************************************************************
*                                                            *
*                The system was installed using              *
*                           TESSIA                           *
* Task Execution Supporter and System Installation Assistant *
*                                                            *
* Open source repo: https://gitlab.com/tessia-project        *
* (GitHub mirror: https://github.com/tessia-project)         *
*                                                            *
* Documentation is located here:                             *
* https://gitlab.com/tessia-project/tessia/-/tree/master/doc *
*                                                            *
* To create custom templates for auto installation see:      *
* > tess autotemplate add --help                             *
*                                                            *
**************************************************************

Last login: Wed Mar 31 06:38:45 2021 from 172.18.0.1
root@m35lp41:~#
root@m35lp41:~# cat /sys/devices/qeth/0.0.bd00/buffer_count
128
----

And the result looks good to me.
Thank you.

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https://bugs.launchpad.net/bugs/1892367

Title:
  [UBUNTU 20.04] udev rule change did not get applied

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