How to access the CCA related operation

How to access the CCA related operation

[Seowoo Jang]

Hello, 

We are trying to evaluate our idea on 802.11ac protocol with Atheros qca9880
/ ath10k driver. 

We would like to be able to access/know the result of the CCA (clear channel
assessment) operation 
or the level of interference on the carrier when we need.

We have dug into the driver files and concluded that the CCA related values
are likely 
in the firmware or on the registers of the hardware.

And please correct us if we are thinking wrong.

We would appreciate the help if someone can give us some starting points, 
such as the address of the register that stores the carrier sensing values
(CCA values) 
or the result of it (whether the carrier is busy or idle), to investigate.

The chipset we are using is compex WLE900VX-7AA.

We are currently using Ubuntu 14.04.03 with kernel version 4.1.5, 
but we can use any versions of OS and kernel if they support 802.11ac
bandwidth.

Thank you for help in advance.

-------------------------------
Seowoo Jang, Ph.D.
Ubiquitous Network Laboratory
EECS, Seoul National University

CEL   +82-10-3723-3401
E-mail swjang@netlab.snu.ac.kr
-------------------------------


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Re: How to access the CCA related operation

[Ben Greear]

It is in firmware, and you cannot reliably poke it through the driver
read/write register API because each time the radio resets (channel change, etc), it is
liable to re-write the CCA registers back to default values.

There is a large list of registers with 'CCA' in the name, but I don't
know what they really mean, and I had hard time getting that info out
of QCA.  If you have any better luck, please post whatever you can
share.

Thanks,
Ben


On 08/23/2015 11:21 PM, Seowoo Jang wrote:
> Hello,
>
> We are trying to evaluate our idea on 802.11ac protocol with Atheros qca9880
> / ath10k driver.
>
> We would like to be able to access/know the result of the CCA (clear channel
> assessment) operation
> or the level of interference on the carrier when we need.
>
> We have dug into the driver files and concluded that the CCA related values
> are likely
> in the firmware or on the registers of the hardware.
>
> And please correct us if we are thinking wrong.
>
> We would appreciate the help if someone can give us some starting points,
> such as the address of the register that stores the carrier sensing values
> (CCA values)
> or the result of it (whether the carrier is busy or idle), to investigate.
>
> The chipset we are using is compex WLE900VX-7AA.
>
> We are currently using Ubuntu 14.04.03 with kernel version 4.1.5,
> but we can use any versions of OS and kernel if they support 802.11ac
> bandwidth.
>
> Thank you for help in advance.
>
> -------------------------------
> Seowoo Jang, Ph.D.
> Ubiquitous Network Laboratory
> EECS, Seoul National University
>
> CEL   +82-10-3723-3401
> E-mail swjang@netlab.snu.ac.kr
> -------------------------------
>
>
> _______________________________________________
> ath10k mailing list
> ath10k@lists.infradead.org
> http://lists.infradead.org/mailman/listinfo/ath10k
>

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

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Re: How to access the CCA related operation

[Adrian Chadd]

There's TX_FRAME, RX_FRAME, RX_BUSY, etc state machine indications
that you can break out via GPIO pins..



-adrian


On 24 August 2015 at 09:32, Ben Greear <greearb@candelatech.com> wrote:
> It is in firmware, and you cannot reliably poke it through the driver
> read/write register API because each time the radio resets (channel change,
> etc), it is
> liable to re-write the CCA registers back to default values.
>
> There is a large list of registers with 'CCA' in the name, but I don't
> know what they really mean, and I had hard time getting that info out
> of QCA.  If you have any better luck, please post whatever you can
> share.
>
> Thanks,
> Ben
>
>
>
> On 08/23/2015 11:21 PM, Seowoo Jang wrote:
>>
>> Hello,
>>
>> We are trying to evaluate our idea on 802.11ac protocol with Atheros
>> qca9880
>> / ath10k driver.
>>
>> We would like to be able to access/know the result of the CCA (clear
>> channel
>> assessment) operation
>> or the level of interference on the carrier when we need.
>>
>> We have dug into the driver files and concluded that the CCA related
>> values
>> are likely
>> in the firmware or on the registers of the hardware.
>>
>> And please correct us if we are thinking wrong.
>>
>> We would appreciate the help if someone can give us some starting points,
>> such as the address of the register that stores the carrier sensing values
>> (CCA values)
>> or the result of it (whether the carrier is busy or idle), to investigate.
>>
>> The chipset we are using is compex WLE900VX-7AA.
>>
>> We are currently using Ubuntu 14.04.03 with kernel version 4.1.5,
>> but we can use any versions of OS and kernel if they support 802.11ac
>> bandwidth.
>>
>> Thank you for help in advance.
>>
>> -------------------------------
>> Seowoo Jang, Ph.D.
>> Ubiquitous Network Laboratory
>> EECS, Seoul National University
>>
>> CEL   +82-10-3723-3401
>> E-mail swjang@netlab.snu.ac.kr
>> -------------------------------
>>
>>
>> _______________________________________________
>> ath10k mailing list
>> ath10k@lists.infradead.org
>> http://lists.infradead.org/mailman/listinfo/ath10k
>>
>
> --
> Ben Greear <greearb@candelatech.com>
> Candela Technologies Inc  http://www.candelatech.com
>
>
> _______________________________________________
> ath10k mailing list
> ath10k@lists.infradead.org
> http://lists.infradead.org/mailman/listinfo/ath10k

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RE: How to access the CCA related operation

[Peter Oh]

There is WMI_10_x_SET_CCA_PARAMS_CMDID which to enable adaptive CCA in
firmware supported since 10.2.4 and all the actual operations are done in
firmware with registers as Ben addressed.
But I'm not clear how much register doc or firmware doc are opened to public
legally.

Thanks,
Peter

-----Original Message-----
From: ath10k [mailto:ath10k-bounces@lists.infradead.org] On Behalf Of Ben
Greear
Sent: Monday, August 24, 2015 9:33 AM
To: Seowoo Jang; ath10k@lists.infradead.org
Subject: Re: How to access the CCA related operation

It is in firmware, and you cannot reliably poke it through the driver
read/write register API because each time the radio resets (channel change,
etc), it is liable to re-write the CCA registers back to default values.

There is a large list of registers with 'CCA' in the name, but I don't know
what they really mean, and I had hard time getting that info out of QCA.  If
you have any better luck, please post whatever you can share.

Thanks,
Ben


On 08/23/2015 11:21 PM, Seowoo Jang wrote:
> Hello,
>
> We are trying to evaluate our idea on 802.11ac protocol with Atheros 
> qca9880 / ath10k driver.
>
> We would like to be able to access/know the result of the CCA (clear 
> channel
> assessment) operation
> or the level of interference on the carrier when we need.
>
> We have dug into the driver files and concluded that the CCA related 
> values are likely in the firmware or on the registers of the hardware.
>
> And please correct us if we are thinking wrong.
>
> We would appreciate the help if someone can give us some starting 
> points, such as the address of the register that stores the carrier 
> sensing values (CCA values) or the result of it (whether the carrier 
> is busy or idle), to investigate.
>
> The chipset we are using is compex WLE900VX-7AA.
>
> We are currently using Ubuntu 14.04.03 with kernel version 4.1.5, but 
> we can use any versions of OS and kernel if they support 802.11ac 
> bandwidth.
>
> Thank you for help in advance.
>
> -------------------------------
> Seowoo Jang, Ph.D.
> Ubiquitous Network Laboratory
> EECS, Seoul National University
>
> CEL   +82-10-3723-3401
> E-mail swjang@netlab.snu.ac.kr
> -------------------------------
>
>
> _______________________________________________
> ath10k mailing list
> ath10k@lists.infradead.org
> http://lists.infradead.org/mailman/listinfo/ath10k
>

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

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http://lists.infradead.org/mailman/listinfo/ath10k


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Re: How to access the CCA related operation

[Ben Greear]

On 08/24/2015 10:31 AM, Peter Oh wrote:
> There is WMI_10_x_SET_CCA_PARAMS_CMDID which to enable adaptive CCA in
> firmware supported since 10.2.4 and all the actual operations are done in
> firmware with registers as Ben addressed.
> But I'm not clear how much register doc or firmware doc are opened to public
> legally.

We have found no upstream firmware that actually seems to support that SET_CCA_PARAMS,
and I have no idea what that feature actually does since I have no firmware source
that supports that feature.

Thanks,
Ben

>
> Thanks,
> Peter
>
> -----Original Message-----
> From: ath10k [mailto:ath10k-bounces@lists.infradead.org] On Behalf Of Ben
> Greear
> Sent: Monday, August 24, 2015 9:33 AM
> To: Seowoo Jang; ath10k@lists.infradead.org
> Subject: Re: How to access the CCA related operation
>
> It is in firmware, and you cannot reliably poke it through the driver
> read/write register API because each time the radio resets (channel change,
> etc), it is liable to re-write the CCA registers back to default values.
>
> There is a large list of registers with 'CCA' in the name, but I don't know
> what they really mean, and I had hard time getting that info out of QCA.  If
> you have any better luck, please post whatever you can share.
>
> Thanks,
> Ben
>
>
> On 08/23/2015 11:21 PM, Seowoo Jang wrote:
>> Hello,
>>
>> We are trying to evaluate our idea on 802.11ac protocol with Atheros
>> qca9880 / ath10k driver.
>>
>> We would like to be able to access/know the result of the CCA (clear
>> channel
>> assessment) operation
>> or the level of interference on the carrier when we need.
>>
>> We have dug into the driver files and concluded that the CCA related
>> values are likely in the firmware or on the registers of the hardware.
>>
>> And please correct us if we are thinking wrong.
>>
>> We would appreciate the help if someone can give us some starting
>> points, such as the address of the register that stores the carrier
>> sensing values (CCA values) or the result of it (whether the carrier
>> is busy or idle), to investigate.
>>
>> The chipset we are using is compex WLE900VX-7AA.
>>
>> We are currently using Ubuntu 14.04.03 with kernel version 4.1.5, but
>> we can use any versions of OS and kernel if they support 802.11ac
>> bandwidth.
>>
>> Thank you for help in advance.
>>
>> -------------------------------
>> Seowoo Jang, Ph.D.
>> Ubiquitous Network Laboratory
>> EECS, Seoul National University
>>
>> CEL   +82-10-3723-3401
>> E-mail swjang@netlab.snu.ac.kr
>> -------------------------------
>>
>>
>> _______________________________________________
>> ath10k mailing list
>> ath10k@lists.infradead.org
>> http://lists.infradead.org/mailman/listinfo/ath10k
>>
>
> --
> Ben Greear <greearb@candelatech.com>
> Candela Technologies Inc  http://www.candelatech.com
>
> _______________________________________________
> ath10k mailing list
> ath10k@lists.infradead.org
> http://lists.infradead.org/mailman/listinfo/ath10k
>

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

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