[ath9k-devel] Handling received ACK frame in ath9k_htc

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

Am 08.07.2015 um 16:16 schrieb Jeon:
> I am trying to timestamp when a ACK frame is received in ath9k_htc module.
> WLAN card is TL-WN722N from TP-LINK
> 
> I've modified a function `ath9k_rx_tasklet()` in
> `ath/ath9k/htc_drv_txrx.c` like
> [this](https://gist.github.com/gsongsong/991705f9c38ce6a9cda7#file-gistfile1-txt-L37)
> 
> When I build and install the modified  kernel source, however, that
> `printk` message does not appear in the `dmesg` log.
> 
> After some search, I've found [a
> thread](https://www.mail-archive.com/ath9k-devel%40lists.ath9k.org/msg12280.html).
> It says, ACK is processed by hardware itself and is not passed to
> ath9k_htc kernel module. Is it right? Then, isn't there a way to check
> whether an ACK frame is received in a ath9k_htc kernel module?

You need to digg in to firmware. ath9k_htc HW is mostly Atheros PCI
controller connected to a SoC and then to USB. Part of magic which is
happening in ath9k is located in ath9k_htc_fw.

-- 
Regards,
Oleksij

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