Public bug reported:
I noticed on a couple of systems that my network interface names change
when upgrading from the focal LTS (5.4) kernel to the focal HWE (both
5.8 & 5.11) kernels. Both systems have Mellanox Connect-X 5 NICs.
dannf@bizzy:~$ uname -a
Linux bizzy 5.4.0-81-generic #91-Ubuntu SMP Thu Jul 15 19:10:30 UTC 2021
aarch64 aarch64 aarch64 GNU/Linux
dannf@bizzy:~$ ls /sys/class/net
enp1s0f0 enp1s0f1 enx3e8734bc294f lo
dannf@bizzy:~$ uname -a
Linux bizzy 5.8.0-63-generic #71~20.04.1-Ubuntu SMP Thu Jul 15 17:46:44 UTC
2021 aarch64 aarch64 aarch64 GNU/Linux
dannf@bizzy:~$ ls /sys/class/net
enp1s0f0np0 enp1s0f1np1 enx3e8734bc294f lo
dannf@bizzy:~$ uname -a
Linux bizzy 5.11.0-27-generic #29~20.04.1-Ubuntu SMP Wed Aug 11 15:58:08 UTC
2021 aarch64 aarch64 aarch64 GNU/Linux
dannf@bizzy:~$ ls /sys/class/net
enp1s0f0np0 enp1s0f1np1 enx3e8734bc294f lo
I bisected this down to a kernel change:
# first bad commit: [c6acd629eec754a9679f922d51f90e44c769b80c] net/mlx5e: Add
support for devlink-port in non-representors mode
The impact is that your network can fail to come up after transitioning
from the LTS kernel to the HWE kernel. Now, this isn't a huge problem
for MAAS installs because MAAS configures netplan to always use the same
names as were used at commissioning. It does impact subiquity based
installs however, which do not.
** Affects: linux (Ubuntu)
Importance: Undecided
Status: Confirmed
** Affects: systemd (Ubuntu)
Importance: Undecided
Status: New
** Changed in: linux (Ubuntu)
Status: New => Confirmed
** Also affects: systemd (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1940860
Title:
Mellanox NIC interface names change between 5.4 and 5.8
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