[ath9k-devel] How to adjust/know rate for acknowledgments?

[Janboe Ye <janboe.ye@gmail.com>]

Sujith

which specs you are referencing? Is it 802.11-2007?

Thanks

Janboe


On 13-8-5 ??2:34, Sujith Manoharan wrote:
> Lars Kristian R Johansen wrote:
>> The ack should be sent with the highest possible rate restricted by these two
>> conditions, whichever is lower:
>> - the rates in the stations basic rate set
>> - rate of the data frame that is being acked
> I believe the spec. is more complicated than that. :-)
>
>> If I am correct, does that mean that if I receive a data frame at MCS rate
>> index 5 and I have 0-7 in my supported MCS rate index set, then I will send
>> the ack with MCS rate index 5?
> An ACK can be sent either as a HT or a non-HT frame. If all the conditions that
> allow HT control frames to be sent are met, then MCS rate determination is done
> according to the rules in 9.7.6.5.3
>
> For non-HT control frames, the table 9.7.9 is used.
>
> In the draft-11n days, I think there was a programmable ACK rate table in
> the HW, which was removed once the spec. was finalized.
>
>> If this is incorrect, is there a way to verify what the specific rate I am
>> sending an ack with?
> An external sniffer can be used to capture control frames, by setting the
> required monitor interface flags:
>
> iw help set monitor
> Commands:
>          dev <devname> set monitor <flag>*
>                  Set monitor flags. Valid flags are:
>                  none:     no special flags
>                  fcsfail:  show frames with FCS errors
>                  control:  show control frames
>                  otherbss: show frames from other BSSes
>                  cook:     use cooked mode
>                  active:   use active mode (ACK incoming unicast packets)
>
>
> Sujith
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