From: Arend van Spriel <arend.vanspriel@broadcom.com>
To: Gucea Doru <gucea.doru@gmail.com>, Arend van Spriel <arend@broadcom.com>
Cc: Andra Paraschiv <andra.paraschiv7@gmail.com>,
linux-wireless@vger.kernel.org
Subject: Re: bcmdhd: Strange Power Save messages
Date: Sat, 1 Oct 2016 11:22:11 +0200 [thread overview]
Message-ID: <ed4a7366-3f67-79da-0868-876a69b1da54@broadcom.com> (raw)
In-Reply-To: <CANfLQrZxEUX0UMwrVNZHps9ztqxmOaeovy34fey2NkErCDDarQ@mail.gmail.com>
On 29-09-16 13:32, Gucea Doru wrote:
> On Tue, Sep 27, 2016 at 12:03 PM, Gucea Doru <gucea.doru@gmail.com> wrote:
>> What is the decision triggering the exit from the PS mode immediately
>> after the ping request? I am asking this because 802.11 PS legacy
>> specifies that the client should wait for a beacon with TIM set in
>> order to wake up: in my case, there is no beacon between the ping
>> request message and the Null frame that announces the exit from the PS
>> mode.
>
>
> Any help would be highly appreciated :)
Actually though I already sent you are reply, but alas here it is.
bcmdhd is our aosp driver. I am maintaining the upstream brcm80211
drivers. Regardless your question is more for firmware running on the
device. So like the same behavior would be observed when using brcmfmac
with same firmware.
> IEEE Std 802.11-2012, section 10.2.1.8 specifies that "when the STA
> detects that the bit corresponding to its AID is 1 i the TIM, the STA
> shall issue a PS Poll". In my capture there are cases when the STA
> exits the PS mode without waiting for a beacon.
It is a bit tricky, but the standard does not explicitly say the STA
should be in power-save at any other time. So it is difficult to say
what event occurred on the STA side to exit PS mode. Also STA means
P2P-Client as you say. That means that you have multiple interfaces:
regular STA and P2P-Client. So is the STA connected to some other AP or
just not connected. wpa_supplicant will do intermittent scan or initiate
scheduled scan by which firmware will scan at a certain interval. That
is just some things I can come up with and I am sure there are more.
Regards,
Arend
next prev parent reply other threads:[~2016-10-01 9:22 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-09-27 9:03 bcmdhd: Strange Power Save messages Gucea Doru
2016-09-29 11:32 ` Gucea Doru
2016-10-01 9:22 ` Arend van Spriel [this message]
2016-10-01 12:02 ` Krishna Chaitanya
2016-10-04 11:39 ` Gucea Doru
2016-10-04 12:37 ` Krishna Chaitanya
2016-10-04 18:27 ` Gucea Doru
2016-10-04 18:54 ` Krishna Chaitanya
2016-10-05 9:12 ` Arend Van Spriel
2016-10-06 8:07 ` Gucea Doru
2016-10-06 8:25 ` Arend Van Spriel
2016-10-07 14:33 ` Gucea Doru
2016-10-11 19:12 ` Arend van Spriel
2016-10-12 14:26 ` Gucea Doru
2016-10-12 18:48 ` Arend van Spriel
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