[ath9k-devel] ATH9K PCI Question

[Paul <Paul@freedomwifi.com.au>]

C. McPherson <ccmcphe <at> 
verizon.net> writes:

> 
> That did not work. I did change 
ieee80211_monitor_start_xmit() in 
> mac80211 tx.c where it sets the 
info->flags  from:
> 
>       info->flags = 
IEEE80211_TX_CTL_REQ_TX_STATUS |
> IEEE80211_TX_CTL_INJECTED;
> 
> to the following:
>       info->flags = 
IEEE80211_TX_CTL_REQ_TX_STATUS | 
IEEE80211_TX_CTL_NO_ACK
> IEEE80211_TX_CTL_INJECTED;
> 
> and that got rid of the retries. 
When injecting. This is because the 
> setting of the 
IEEE80211_TX_CTL_NO_ACK flag in 
> ieee80211_monitor_start_xmit(), 
allows the ath9k ath_tx_fill_desc() 
to 
> check the flags and set 
ATH9K_TXDESC_NOACK  properly.
> 
> -Clyde
> 
> > Okay, thank you for the 
information.
> >
> > -Clyde
> > On 03/15/2013 04:28 PM, Adrian 
Chadd wrote:
> >> You need to ensure that:
> >>
> >> * you don't request an ACK if 
you don't want one;
> >> * you set the hardware retry 
count to 1
> >>
> >>
> >>
> >> Adrian
> >>
> >>
> >> On 15 March 2013 10:54, C. 
McPherson <ccmcphe <at> verizon.net> 
wrote:
> >>> Hello:
> >>> I am using the Ubiquity SR71 
PCI in my lab using monitor mode and 
frame
> >>> injection. I noticed that when 
I inject control frames RTS/CTS, ACKs 
the
> >>> card is also sending out retry 
frames. I was wondering if there is a 
way
> >>> I can turn that off that in 
ath9k software? In other words I want 
to
> >>> inject 1 CTS frame, and on my 
wireshark machine I just want to see 
that
> >>> CTS frame I injected, no retry 
frames.
> >>>
> >>>
> >>> Thanks in advance
> >>> Clyde
> >>> 
_____________________________________
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> >>> ath9k-devel <at> 
lists.ath9k.org
> >>> 
https://lists.ath9k.org/mailman/listi
nfo/ath9k-devel
> > 
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> > 
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nfo/ath9k-devel
> >
> 

Hi, 

I realise this is quite an old 
thread, but I have this exact issue 
of retry packets when injecting. I'd 
just like to know if this requires 
the driver to be patched or if it is 
something that can be passed in while 
injecting the packet? 

I found an example packet injector 
script that mentioned building the 
radio tap header with 2 extra bytes 
(0x80,0x00) on the end to turn ack 
off. I tried this, but the retries 
still come through. 

If anyone could lend a bit if 
assistance or more detail on how to 
implement this without patching the 
driver it would be greatly 
appreciated. 

Regards
Paul