Re: [fedora-arm] Banana Pi-R1 - kernel 5.6.0 and later broken - b43 DSA

[Peter Robinson]

> I'm having troubles with the Banana Pi-R1 router with newer kernels. No
> config changes, config works well since a lot of lernel updates ...
> Banana Pi-R1 is configured via systemd-networkd and uses the DSA
> (Distributed Switch Architecture) with b53 switch. No visible difference
> in interfaces, vlan config, bridge config, etc. Looks like actual
> configuration in the switch in the hardware is broken.
>
> # OK: Last good known version (booting that version is also ok)
> Linux bpi 5.5.18-200.fc31.armv7hl #1 SMP Fri Apr 17 17:25:00 UTC 2020
> armv7l armv7l armv7l GNU/Linux
>
> # NOK: no network
> Linux bpi 5.6.8-200.fc31.armv7hl #1 SMP Wed Apr 29 19:05:06 UTC 2020
> armv7l armv7l armv7l GNU/Linux
>
> # NOK: no network
> Linux bpi 5.6.0-300.fc32.armv7hl #1 SMP Mon Mar 30 16:37:50 UTC 2020
> armv7l armv7l armv7l GNU/Linux
>
> # NOK: no network
> Linux bpi 5.6.19-200.fc31.armv7hl #1 SMP Wed Jun 17 17:10:22 UTC 2020
> armv7l armv7l armv7l GNU/Linux
>
> # NOK: no network
> Linux bpi 5.7.4-200.fc32.armv7hl #1 SMP Fri Jun 19 00:52:22 UTC 2020
> armv7l armv7l armv7l GNU/Linux
>
>
> Saw that there were a lot of changes in the near past in the b53 driver:
>
> https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/log/drivers/net/dsa/b53?h=v5.8-rc1+

So from your notes above it looks like something regressed between the
5.5.x series and the 5.6.0 release? If so I'm not sure what the
context of the changed in 5.8 are here. If there's more changes to the
driver in 5.8 dev cycle have you tried one of the Fedora rawhide 5.8
rc1 or rc2 kernel builds to see if that resolves it?

Failing that looking for the change in the 5.6 cycle would likely be
the better bet so we can work out what broke it and report it to the
upstream driver maintainer. Have you searched to see if others are
seeing a similar issue or have reported a similar issue upstream?