K 10
svn:author
V 6
adrian
K 8
svn:date
V 27
2011-02-09T15:43:38.257946Z
K 7
svn:log
V 1293
Add in the (very!) optional glue to flip the 11n bits for if_ath.

There's still a lot of random issues to sort out with the radio side of
things and AMPDU RX handling (and completely missing AMPDU TX handling!)
but if people wish to give this a go and assist in debugging the
issues, they can define ATH_DO_11N to enable it.

I'm just re-iterating - this is here to allow people to assist in
further 11n development; it is not any indication that the 11n support
is complete and functional.

Important notes:

* This doesn't support 1-stream cards yet - (eg AR9285) - the various bits
  that negotiate TX/RX MCS don't know not to try >1 stream TX or negotiate
  1-stream RX; so don't enable 11n unless you've first taught the rate
  control module and the net80211 stack to negotiate 1-stream stuff;

* The only rate control module minimally 11n aware is ath_rate_sample;

* ath_rate_sample doesn't know about HT/40; so airtime will be incorrectly
  calculated;

* The AR9160 and AR9280 radio code is unreliable at the higher MCS rates for
  some reason; this will definitely impact 11n performance;

* AMPDU-TX isn't yet implemented;

* AMPDU-RX may be a bit buggy still and will definitely suffer from the
  radio unreliability mentioned above (ie, don't expect 150/300mbit
  RX just yet.)

END