You are right,
I have used; ath9k_hw_computetxtime()
ath_pkt_duration()
for data packets.
I have questions for RTS, ACK :
(1) I don't know if they use short/long preamble ?
There is no 40mhz ,gi for control packets, as far I can think
ath9k_hw_computetxtime() uses ieee80211_rate->bitrate {a value in kbps) as
the input, and there is no index used, unlike in this case, there is an
index used in ath_buf_set_rate()
<code>
info->rtscts_rate = rate->hw_value;
</code>
(2) Do I subtract 1 ACK frame from the timestamp of ath_tx_status
If yes, I can't find the hw rate index for bitrate of ACK !
Thomas (another person who responded on the list) said its 6 Mbps, but what
can I use as the index ?
Awaiting response !
-Abhinav
On Thu, Nov 29, 2012 at 7:38 PM, Adrian Chadd <adrian.ch...@gmail.com>wrote:
> There's a function to calculate the TX time of a frame given the rate
> and the config (short/long gi, 20/40mhz, short/long preamble.)
>
> You should use that? :-)
>
>
>
> Adrian
>
>
> On 29 November 2012 15:36, abhinav narain <abhinavnarai...@gmail.com>
> wrote:
> > hi,
> > I am trying to infer the time of frame when it was at head of queue.
> > ath9k returns the time of successful retransmission in
> > ath_tx_status->ts_tstamp.
> >
> > I have calculated the time for frame duration using ath_buf_set_rate().
> > I am doing this in ath_tx_rc_status()
> >
> > I am somehow exporting the rts rate from the ath_buf_set_rate(), but
> > ieee80211_rate->hw_value is a hardware rate code I suppose and is
> written to
> > register.
> > How do I calculate the airtime from this no ?
> > currently, I did
> > rts airtime = 20*(tx_status->shortretry) / rate->hw_value ! which is not
> > right ..
> > Can someone suggest what shall I do .. the hw_value is set to 11,27 most
> of
> > the time.
> >
> > I am calulating the time at head by doing ath_tx_status->ts_stamp -
> > (time_for_data_frame_retx + rts_artime )
> >
> > Do I need to add (14/6)i.e ACK back at 6 Mbps above also ?
> > Do I need to add some SIFS constant ?
> >
> > is rts_airtime calculation correct ? or there are SIFS to be added ?
> >
> > compat-wireless folder doesn't have code for such calculations. Can
> someone
> > please suggest ?
> >
> > -Abhinav Narain
> >
> >
>
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