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Date: Wed, 08 Jul 2009 20:06:26 +1000
From: David Ross <dave@antacs.com>
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To: linux-wireless@vger.kernel.org
Subject: Re: mac80211 and broadcast frames
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Valentin Manea wrote:
>   I've found the code in ath9k and you are right, it always chooses 
> the lowest rate.
>   So, basically to transmit multicast frames at a better bitrate I 
> have to hack the rate control algorithm, right?
>
> Thanks,
> Valentin
If you want to still be an 802.11 device then you may only use one of 
the basic rates, no extended rates, viz:
"All frames with multicast and broadcast in the Address 1 field that 
have a UP of zero shall be transmitted at one of the rates included in 
the BSSBasicRateSet parameter, regardless of their type or subtype." 
(from the 2007 edition of the standard).

- David Ross.