RE: [PATCH rtw-next v8 2/3] wifi: rtw88: support channel switch in AP mode

[Ping-Ke Shih <pkshih@realtek.com>]

Mehmet Fide <mehmet.fide@gmail.com> wrote:
> Hi Ping-Ke,
> 
> > During the WoW suspend, I think AP stays on original channel and sends
> > beacon without countdown. How does associated STA do? Will it switch to
> > target channel and disconnect result from no beacon?
> 
> Yes. I tried it with mac80211_hwsim on wireless/main: the station
> switches on its timer even when the AP goes on beaconing on the old
> channel without the CSA element, and disconnects after the beacon
> loss. From the code, only drivers with abort_channel_switch (iwlwifi,
> mt7921, mt7925) abort the switch on such a beacon and stay.
> 
> The AP stays up during WoWLAN only with AP + station on the 8822C:
> WoWLAN takes a station vif only, so with an AP alone rtw_ops_suspend()
> returns 1 and cfg80211 stops the AP before suspending. I checked this
> on an RTL8822CU during a countdown.
> 
> Refusing WoWLAN during a switch would not help the stations, cfg80211
> would stop the AP as well, so I would keep v9. The resume path does
> not run on USB, the device is unbound during suspend; an 8822CE is on
> order, it takes two to three weeks, and I can test it when it arrives.

Understood. Then, AP mode continues to switch to target channel after
the resume.

Ping-Ke