@ddstreet I agree that systemd is behaving as designed. But I'm not sure
what the proper fix for this is, and therefore where changes would be
required.
My initial thought is that perhaps subiquity installs should do what
MAAS installs do and configure netplan to always use the install-time
names. I've added a subiquity for that consideration. Note that if that
is the chosen solution, we should be careful to ignore NICs with
randomly generated MACs (see bug 1936972).
** Also affects: subiquity
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
Status in subiquity:
New
Status in linux package in Ubuntu:
Confirmed
Status in systemd package in Ubuntu:
New
Bug description:
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.
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