Re: My iwn device can no longer scan for access points with stable/13

On Wed, 16 Feb 2022, John Schneider wrote:

Hi,

> Today I upgraded from releng/13.0 to stable/13 but found my iwn device
> could no longer scan for access points.  I rolled back to releng/13.0 and
> everything was fine again.  No config changes were made during the upgrade
> or rollback process.
>
> /var/log/messages contained messages such as the one below with each scan
> attempt:
> Feb 16 16:12:33 mobile1 wpa_supplicant[385]: wlan0: CTRL-EVENT-SCAN-FAILED
> ret=-1 retry=1

-1 is nothing the kernel should return so I don't know what the actual
error is.


> I didn't see any other errors except ACPI stuff which looked normal to me
> for this machine.  For reference, here is the pciconf output for my device:
>
> iwn0@pci0:2:0:0:        class=0x028000 rev=0x35 hdr=0x00 vendor=0x8086
> device=0x
> 422b subvendor=0x8086 subdevice=0x1121
>   vendor     = 'Intel Corporation'
>   device     = 'Centrino Ultimate-N 6300'
>   class      = network
>
> Is it possible that work being done for iwlwifi could affect scanning with
> iwn and other drivers?

It shouldn't as there were very little functional changes to net80211
itself so far relating to this.

I would more likely think of wpa_supplicant updates but even that we'd
probably have heard a lot more noise.  You could run that with

 	wpa_supplicant_flags="-sdd"

in rc.conf (from the top of my head) and see.

Also did you update kernel and world or was that just a kernel update
(which would rule out the above wpa_supplicant update theory)?


I also only see 3 changes to iwn(4) in main and 2 of them in stable/13
since releng/13.0:

https://cgit.freebsd.org/src/commit/sys/dev/iwn?h=stable/13&id=d61f10a8780ef94f82e384248ce40d24fc27ad2b
https://cgit.freebsd.org/src/commit/sys/dev/iwn?h=stable/13&id=67b7e2de4fc5dc1165feee8ca281c44444425d0f

and the one Adrian did not MFC:
https://cgit.freebsd.org/src/commit/sys/dev/iwn?id=b6fd00791f2b9690b0a5d8670fc03f74eda96da2&h=stable%2F13


In case you are willing to go back to stable/13 and re-test things
let me know so we can crank some debugging/logging up to see where the
error comes from.



> On a separate subject, I had tested iwlwifi on a
> separate machine with stable/13 and an AX201 and it was quite stable
> (though slow as has been reported by others). Keep up the great work!

Thanks for testing.  I'll try to make it more stable and then faster :)

Best Regards,
Bjoern

-- 
Bjoern A. Zeeb                                                     r15:7