[ath9k-devel] [ath9k_htc] TX retry packet

[Oleksij Rempel <linux@rempel-privat.de>]

Am 15.07.2013 18:19, schrieb Matteo Danieletto:
> Hi all,
> I am looking for the number of packets (frame) retransmitted during a
> finite interval.
> The USB adapter is TL-WN722N (driver ath9k_htc) and I am testing it in
> IBSS mode with kernel 3.2.0 .
>
> I found
> in /sys/kernel/debug/ieee80211/phy1/netdev:wlan3/stations/00:1d:7d:49:2e:4e/tx_retry_count
>
> but the output is always 0 .
>
> So, for my point of view is strange that never occurred a mac
> retransmission.
> Do you know if it is a common problem?
>
> I have tried even with an ath9k and this time it worked.
>
> Do you know which is the C struct I need to read to find the number of
> retransmission?

Hi Matteo,

you need to digg into firmware. Retransmission is done some where here 
target_firmware/wlan/if_owl.c:
ath_tx_retry_subframe()

or some thing like this. You are welcome to provide patches ;)
see:
https://github.com/qca/open-ath9k-htc-firmware

I also started to work on documentaion... there are some drafts, may be 
it will help you understand how firmware works:

https://github.com/qca/open-ath9k-htc-firmware/wiki/usb-regs

https://docs.google.com/document/d/1pg27qHGx-2hsx9tGCwj0l9EtJZU-viquaOKC02WRt6Y/pub
-- 
Regards,
Oleksij