[ath9k-devel] Enabling tx-power-per-vif in ath9k?

[ath9k-devel] Enabling tx-power-per-vif in ath9k?

[Ben Greear]

It seems there is some mac80211 framework for handling per VIF tx-power
settings now, but from what I can tell, this is not supported in ath9k.

Any idea how feasible it is to do per-vif tx-power in ath9k?  I think
it would come down to putting the desired tx-power into each packet
(as the VIF sends it towards the driver) and then changing the power
as packets were transmitted in the NIC...

The goal is to have multiple virtual APs, each with different tx-powers
in order to roughly affect rx-signal quality for the stations that
are scanning for APs...

Thanks,
Ben

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

[ath9k-devel] Enabling tx-power-per-vif in ath9k?

[Felix Fietkau]

On 2013-03-04 11:28 PM, Ben Greear wrote:
> It seems there is some mac80211 framework for handling per VIF tx-power
> settings now, but from what I can tell, this is not supported in ath9k.
Correct.

> Any idea how feasible it is to do per-vif tx-power in ath9k?  I think
> it would come down to putting the desired tx-power into each packet
> (as the VIF sends it towards the driver) and then changing the power
> as packets were transmitted in the NIC...
No need for 'changing the power as packets were transmitted', that would
be horribly messy and unreliable anyway. The hardware is capable of
proper per-packet TPC, configurable via the tx descriptor.

> The goal is to have multiple virtual APs, each with different tx-powers
> in order to roughly affect rx-signal quality for the stations that
> are scanning for APs...
Interesting.

- Felix

[ath9k-devel] Enabling tx-power-per-vif in ath9k?

[Thomas Hühn]

Hi Ben,
> 
>> Any idea how feasible it is to do per-vif tx-power in ath9k?  I think
>> it would come down to putting the desired tx-power into each packet
>> (as the VIF sends it towards the driver) and then changing the power
>> as packets were transmitted in the NIC...
> No need for 'changing the power as packets were transmitted', that would
> be horribly messy and unreliable anyway. The hardware is capable of
> proper per-packet TPC, configurable via the tx descriptor.
I am currently shaping my transmit power control per link codebase for upstream. My current Minstrel changes are a
prerequisite? so hopefully in the next weeks I can take the necessary clean up time.
It enables power level settings per packet (in ath5k chips) and per mrr chain (in several ath9k chips).
> 
>> The goal is to have multiple virtual APs, each with different tx-powers
>> in order to roughly affect rx-signal quality for the stations that
>> are scanning for APs?
I think you can easily extend the TPC code to realize your idea of different tx power levels per VIF.

Greetings Thomas
> 
> _______________________________________________
> ath9k-devel mailing list
> ath9k-devel at lists.ath9k.org
> https://lists.ath9k.org/mailman/listinfo/ath9k-devel

[ath9k-devel] Enabling tx-power-per-vif in ath9k?

[Ben Greear]

On 03/04/2013 02:42 PM, Thomas H?hn wrote:
> Hi Ben,
>>
>>> Any idea how feasible it is to do per-vif tx-power in ath9k?  I think
>>> it would come down to putting the desired tx-power into each packet
>>> (as the VIF sends it towards the driver) and then changing the power
>>> as packets were transmitted in the NIC...
>> No need for 'changing the power as packets were transmitted', that would
>> be horribly messy and unreliable anyway. The hardware is capable of
>> proper per-packet TPC, configurable via the tx descriptor.
> I am currently shaping my transmit power control per link codebase for upstream. My current Minstrel changes are a
> prerequisite? so hopefully in the next weeks I can take the necessary clean up time.
> It enables power level settings per packet (in ath5k chips) and per mrr chain (in several ath9k chips).
>>
>>> The goal is to have multiple virtual APs, each with different tx-powers
>>> in order to roughly affect rx-signal quality for the stations that
>>> are scanning for APs?
> I think you can easily extend the TPC code to realize your idea of different tx power levels per VIF.

Awesome!

I'll look forward to your patches...

Ben

>
> Greetings Thomas
>>
>> _______________________________________________
>> ath9k-devel mailing list
>> ath9k-devel at lists.ath9k.org
>> https://lists.ath9k.org/mailman/listinfo/ath9k-devel


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