From mboxrd@z Thu Jan  1 00:00:00 1970
From: Ben Greear <greearb@candelatech.com>
Date: Wed, 08 May 2013 09:02:44 -0700
Subject: [ath9k-devel] AR9380 frequent disconnect and stucks in AP mode.
In-Reply-To: <201305081322.r48DMkDt011184@ns3.lanforge.com>
References: <201305081322.r48DMkDt011184@ns3.lanforge.com>
Message-ID: <518A7724.8000602@candelatech.com>
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To: ath9k-devel@lists.ath9k.org

On 05/08/2013 06:20 AM, Bhavesh Kamani wrote:
>
> Hi Team,
>
> I captured the packets in the locked state.
> It looks like the AP is sending packets to client and client also sends ACK
> in the locked state.
>
> In the locked state client also sends null data frames. In the null data
> frame I observed PM bit set to 0 and sometimes it is set to 1.
>
> Is there any way to make sure that packet is decrypted successfully on
> client? OR Is there any mechanism which confirm the successful decryption on
> client side?

If you run tcpdump on the client, do you see any packets received from the AP?

If you have debugfs enabled in your kernel, 'ethtool -S wlan0' might show some
useful stats (on a recent kernel)...

You could also cat out the 'xmit' debugfs file, perhaps at:
cat /debug/ieee80211/phy0/ath9k/xmit on both AP and client
and see if the xmit queues have any backlog that will not clear?

Thanks,
Ben


>
> Thanks,
> Bhavesh.
>
> -----Original Message-----
> From: Bhavesh Kamani [mailto:bhavesh.kamani at elitecore.com]
> Sent: Wednesday, May 08, 2013 6:15 PM
> To: 'Felix Fietkau'
> Cc: 'Ben Greear'; 'ath9k-devel at venema.h4ckr.net';
> 'nishit.shah at elitecore.com'
> Subject: RE: [ath9k-devel] AR9380 frequent disconnect and stucks in AP mode.
>
>
> Hi Flex,
>
> I tested this using hostapd-2.0 and compat-drivers-3.8.3-2-snp, but still
> facing the same issue.
>
> Thanks,
> Bhavesh.
>
> -----Original Message-----
> From: Felix Fietkau [mailto:nbd at openwrt.org]
> Sent: Tuesday, May 07, 2013 5:47 PM
> To: Bhavesh Kamani
> Cc: 'Ben Greear'; nishit.shah at elitecore.com; ath9k-devel at venema.h4ckr.net;
> 'Jimit Mahadevia'
> Subject: Re: [ath9k-devel] AR9380 frequent disconnect and stucks in AP mode.
>
> On 2013-05-07 2:03 PM, Bhavesh Kamani wrote:
>>
>> Hi Ben,
>>
>> I tried compat-drivers-3.9-rc4-2-su, then also same problem I faced.
>> I also tried compat-wireless-2.6.39-1 and compat-wireless-3.6.8-1, but
>> facing the same issue.
>>
>> In a day more than one clients are facing the same issue.
>>
>> In the locked state, ping from client to AP not working and tcpdump on AP
>> shows the echo response sent on wlan interface. Only few clients are
> facing
>> this issue frequently, but those clients don't have identical WiFi
> hardware.
>>
>> Is it possible for hardware/firmware to drop the tx packets for particular
>> client? For me look like only data packets are getting dropped.
>> My environment is noisy, will it affect this situation?
> You should also upgrade hostapd to something recent. It's relevant for
> AP mode stability as well.
>
> - Felix
>


-- 
Ben Greear <greearb@candelatech.com>
Candela Technologies Inc  http://www.candelatech.com