Re: [PATCH wireless-next v8 0/3] wifi: initial UHR support

[Johannes Berg <johannes@sipsolutions.net>]

On Mon, 2026-02-02 at 16:20 +0530, Karthikeyan Kathirvel wrote:
> 
> Would like to see your approach of NPCA for AP side, since we are 
> working on Enhanced critical update for all UHR operation features(which 
> includes NPCA as well).

So, FWIW, I went over this a few times in my head ... how do we support
it when one station has NPCA and another doesn't (need a per-STA flag?),
how do we update the NPCA operation when stations with different
parameters join/leave the BSS, etc.

Ultimately I decided that I'm going to leave these problems to you ;-)

For now literally all I've implemented for testing is an ability to
represent NPCA in the chandef (adding npca_chan and npca_punctured
bitmap to it), and two new nl80211 attributes to configure such a
chandef.

That won't even be an upstream hostapd patch, just some hack to set the
NPCA chandef in nl80211 and advertise it in the UHR operation element,
but it's already good enough to test a single client.

(Oh and nl80211 won't accept that unless the driver advertises NPCA
support in UHR for the AP interface, which our driver won't do outside
some testing mode.)

johannes