LinuxKPI: 802.11: iwlwifi: add extra debugging

[bz]

Summary

Add extra debugging to get the vap/vif and sta/ni states
in case we see the "Invalid TXQ id" message from iwlwifi.
Adding a backtrace will not do us much good as we will only
see the deferred TX context but not the origin of the packet.
If we really wanted we could dump the full packet contents
in hex to see what is going out (but quoting from memory
I believe it was all mgmt:auth frames?)

PR: 274382

[emaste]

How chatty is LINUXKPI_DEBUG_80211 in general? I currently do not have it enabled in my WIP tree but will turn it on for this change.

[bz]

In D43879#1001132, @emaste wrote:

How chatty is LINUXKPI_DEBUG_80211 in general? I currently do not have it enabled in my WIP tree but will turn it on for this change.

Should not be much at all unless its (a) enabled by sysctl or (b) we have unconditional printfs currently

[emaste]

sys/compat/linuxkpi/common/src/linux_80211.c

247

build fails with "no previous prototype"

263

[bz]

sys/compat/linuxkpi/common/src/linux_80211.c

247

makes sense; also the function called above needs STA tracing on to print; @cc managed and got some results on the PR for at least the vap/vif. I'll update this once the other full-system compiles have finished.

[bz]

Decouple from LINUXKPI DEBUGGING and lkpi_llsta_dump.
Seems to compile for me now too.

[bz]

In favour of hopefully a fix in the right direction: https://reviews.freebsd.org/D43944