From: Daniel Smith <viscous.liquid@gmail.com>
To: linux-wireless@vger.kernel.org
Subject: Re: carl9170 - single packet injection causes 3 packets to be sent.
Date: Wed, 27 Jun 2012 08:21:46 -0400 [thread overview]
Message-ID: <jsetsp$6q2$1@dough.gmane.org> (raw)
In-Reply-To: <20120626222652.GA11880@192.168.1.10>
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
prev parent reply other threads:[~2012-06-27 12:22 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-06-26 22:26 carl9170 - single packet injection causes 3 packets to be sent marco
2012-06-27 12:21 ` Daniel Smith [this message]
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