linux-kernel - RE: rtlwifi/rtl8192cu AP mode broken with PS STA

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Date:   Mon, 19 Apr 2021 07:04:16 +0000
From:   Pkshih <pkshih@...ltek.com>
To:     Larry Finger <Larry.Finger@...inger.net>,
        "Maciej S. Szmigiero" <mail@...iej.szmigiero.name>
CC:     "linux-wireless@...r.kernel.org" <linux-wireless@...r.kernel.org>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "johannes@...solutions.net" <johannes@...solutions.net>,
        "kvalo@...eaurora.org" <kvalo@...eaurora.org>
Subject: RE: rtlwifi/rtl8192cu AP mode broken with PS STA


> -----Original Message-----
> From: Larry Finger [mailto:larry.finger@...il.com] On Behalf Of Larry Finger
> Sent: Monday, April 19, 2021 9:23 AM
> To: Pkshih; Maciej S. Szmigiero
> Cc: linux-wireless@...r.kernel.org; netdev@...r.kernel.org; linux-kernel@...r.kernel.org;
> johannes@...solutions.net; kvalo@...eaurora.org
> Subject: Re: rtlwifi/rtl8192cu AP mode broken with PS STA
> 
> On 4/18/21 7:32 PM, Pkshih wrote:
> >
> >> -----Original Message-----
> >> From: Maciej S. Szmigiero [mailto:mail@...iej.szmigiero.name]
> >> Sent: Sunday, April 18, 2021 2:08 AM
> >> To: Pkshih
> >> Cc: linux-wireless@...r.kernel.org; netdev@...r.kernel.org; linux-kernel@...r.kernel.org;
> >> johannes@...solutions.net; kvalo@...eaurora.org; Larry Finger
> >> Subject: Re: rtlwifi/rtl8192cu AP mode broken with PS STA
> >>
> >> On 08.04.2021 21:04, Maciej S. Szmigiero wrote:
> >>> On 08.04.2021 06:42, Pkshih wrote:
> >>>>> -----Original Message-----
> >>>>> From: Maciej S. Szmigiero [mailto:mail@...iej.szmigiero.name]
> >>>>> Sent: Thursday, April 08, 2021 4:53 AM
> >>>>> To: Larry Finger; Pkshih
> >>>>> Cc: linux-wireless@...r.kernel.org; netdev@...r.kernel.org; linux-kernel@...r.kernel.org;
> >>>>> johannes@...solutions.net; kvalo@...eaurora.org
> >>>>> Subject: Re: rtlwifi/rtl8192cu AP mode broken with PS STA
> >>>>>
> >>> (...)
> >>>>>> Maceij,
> >>>>>>
> >>>>>> Does this patch fix the problem?
> >>>>>
> >>>>> The beacon seems to be updating now and STAs no longer get stuck in PS
> >>>>> mode.
> >>>>> Although sometimes (every 2-3 minutes with continuous 1s interval pings)
> >>>>> there is around 5s delay in updating the transmitted beacon - don't know
> >>>>> why, maybe the NIC hardware still has the old version in queue?
> >>>>
> >>>> Since USB device doesn't update every beacon, dtim_count isn't updated neither.
> >>>> It leads STA doesn't awake properly. Please try to fix dtim_period=1 in
> >>>> hostapd.conf, which tells STA awakes every beacon interval.
> >>>
> >>> The situation is the same with dtim_period=1.
> >>>
> >> (...)
> >>
> >> Ping-Ke,
> >> are you going to submit your set_tim() patch so at least the AP mode is
> >> usable with PS STAs or are you waiting for a solution to the delayed
> >> beacon update issue?
> >>
> >
> > I'm still trying to get a 8192cu, and then I can reproduce the symptom you
> > met. However, I'm busy now; maybe I have free time two weeks later.
> >
> > Do you think I submit the set_tim() patch with your Reported-by and Tested-by first?
> 
> PK,
> 
> I would say yes. Get the fix in as soon as possible.
> 

I have sent a patch that only 8192cu, which is the only one USB device supported by rtlwifi,
schedules a work to update beacon content to wifi card.

https://lore.kernel.org/linux-wireless/20210419065956.6085-1-pkshih@realtek.com/T/#u

--
Ping-Ke