From: Kirill A. Korinsky <kirill@korins.ky>
Subject: Re: sys/qwz: add support of 11ac with 5Ghz and 20Mhz window only
To: tech@openbsd.org
Date: Sun, 24 May 2026 19:33:49 +0200

On Sun, 24 May 2026 19:05:58 +0200,
Stefan Sperling <stsp@stsp.name> wrote:
> 
> On Sun, May 24, 2026 at 01:08:50AM +0200, Kirill A. Korinsky wrote:
> > tech@,
> > 
> > here minimal implementation of 802.11ac for qwz driver, it works only in
> > 5Ghz network with only 20Mhz window.
> > 
> > Probably I've missed some details, but it works on my honor against unifi.
> > 
> > Tests? Feedback? Ok?
> 
> As far as I understand, reception of 80 MHz wide frames is mandatory in 11ac
> mode. There is nothing in VHT capabilities which would disable the use of
> 40 MHz and 80 MHz.
> An 11ac AP could at any time decide to send frames using 40 MHz or 80 MHz
> width. Would the driver receive such frames with this diff?
> 
> It is unclear to me. Maybe the firmware will still receive such frames even
> in VHT20 mode, just not send them. Or maybe the AP will not see an ACK for
> such frames and retry at 20 MHz eventually, masking the problem.
> 
> In any case, wouldn't it make more sense to add support for 40 MHz
> channels in 11n mode before worrying about 11ac?
> 

Thanks for better direction. I planed to add 40Mhz window as the next step,
but, I think, your right and do it before is better cleaner.

So, I'd like to withdraw this diff.

-- 
wbr, Kirill