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Re: [RFC v2] mac80211: make use of supported rates for probe requests

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On Tue, 2011-09-20 at 11:53 +0530, Rajkumar Manoharan wrote:
> The supported rates on scan trigger helps to send the probe
> request frames on non-11b rates for p2p. For the drivers that
> have rate control on hw like ath9k_htc, this approch does not
> work. So for those drivers wpa_supplicant should set tx rate
> mask to disable 11b rates.

I don't think using the advertised supported rates for actual rate
control is the right approach. I'd much rather have a separate
attribute. Also parsing mgmt-TX frames is plain ugly, and won't work at
all since those frames don't necessarily advertise rates themselves.

Finally, I think setting the global rate control stuff will be bound to
have a whole bunch of ugly races with actual TX -- and remember that
"wlan0" might be connected to an 11b AP at the same time!!

I really think this needs a different approach:
 * use a new attribute for the TX rate for scan/mgmt-tx
 * use per-frame rate control
 * figure out separately how ath9k-htc should work

johannes


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