Re: BATMAN-adv Debug options

[Sven Eckelmann <sven@narfation.org>]

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On Wednesday, 24 June 2020 23:13:50 CEST Mark Birss wrote:
> What other debug  information are available to troubleshoot connection issues?

The first question you have to answer: Is the lower layer working or did the 
lower layer break? Can be tested easily with multicast/broadcast and unicast 
pings on the lower device. Don't assume that the driver/firmware didn't break 
the connection because you see entries in the originator table. And also don't 
assume that the link is working just because you've only tested unicast 
packets on the lower device. WiFi drivers/firmware started to only partially 
(and "accidentally") kill links for only unicast OR for broadcast.

> I have enabled for OpenWRT
> echo "CONFIG_BATMAN_ADV_DEBUG=y" >> .config
> echo "CONFIG_BATMAN_ADV_DEBUGFS=y" >> .config
> echo "CONFIG_BATMAN_ADV_BLA=y" >> .config
> echo "CONFIG_BATMAN_ADV_DAT=y" >> .config
> echo "CONFIG_BATMAN_ADV_MCAST=y" >> .config
> echo "CONFIG_BATMAN_ADV_NC=n" >> .config
> echo "CONFIG_BATMAN_ADV_BATMAN_V=y" >> .config
> echo "CONFIG_BATMAN_ADV_SYSFS=y" >> .config
> echo "CONFIG_BATMAN_ADV_TRACING=y" >> .config
> 
> 
> echo 255 > /sys/class/net/bat0/mesh/log_level
> cat /sys/kernel/debug/batman_adv/bat0/log

Seems about right from the batman-adv perspective. Of course, also check the 
originator/neighbor and local/global translation tables. Use this information 
to check whether the packets are routed correctly through the lower 
interfaces. Just use tools like (batctl) tcpdump to capture this traffic. You 
can also use a recent wireshark to dissect pcaps from the lower interfaces.

You could also start to trace packets using trace-cmd and similar tools to 
figure out where your packets end up inside the kernel.

> since i want to understand also why on wifi mesh seems to crash for me ath10k

I've heard multiple persons complain in recent months about stability problems
of ath10k. So maybe it is the same problem here. But unfortunately, I don't 
have more information than various threads [1] on this mailing list.

Kind regards,
	Sven

[1] https://lists.open-mesh.org/mailman3/hyperkitty/list/b.a.t.m.a.n@lists.open-mesh.org/thread/PZK7RS5CACYDJIW4SH7R6UF7BIQI5OYR/#LZX2PNOX3FLG6L4D3WLRZYEULKD5IEF5

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