On 6/26/2012 6:26 PM, marco wrote:
Hello,
I noticed a problem with packet injection on the carl9170. When I inject a
packet, I see 3 packets go out. I see them with a secondary sniffer on a
different PC. One interesting thing is, if the packet has a broadcast DA mac,
only one packet is injected (as I would expect). I poked around in the
carl9170 driver a little, and it *appears* that it is only sending the single
packet across the usb stick, so I'm guessing the issue is with the
firmware/hardware (?). The only other thing I can think of is perhaps a
radiotap header misconfiguration. Is this a known problem or am I the only one
seeing such a thing? I've seen it across a few driver/firmware revisions.
I'm running:
[ 8.310000] usb 1-1: driver API: 1.9.4 2011-08-15 [1-1]
[ 8.310000] usb 1-1: firmware API: 1.9.4 2011-06-30
I'm currently running compat-wireless-2011-11-22 on a 2.6.37 kernel.
Thanks for any insight you can provide,
Marco Fonseca
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Hi Marco,
I have dealt with a similar issue with the ath9k chipset. On those chips
there is a retries parameter in the TX descriptor. By default the ath9k
driver would set this to three as well. I forget where all I had to make
changes (probably some in mac80211 as well as ath9k) so that I could
pass the retries field in the radiotap header and have it honored by
ath9k. Hopefully this help point you in the right direction.
V/r,
Daniel
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