can't understand the process of RX

Hi all, 
  I have some difficulty to understand the RX process in ath9k and
mac80211, I wonder if you can explain me some or tell me which mail list
should I ask to. 


----------------By the mac80211 overview--------------------------------
• packet received by driver
• passed to mac80211’s rx function (ieee80211_rx) with
rx status info

for each interface that the packet might belong to
        • RX handlers are invoked
        • data: converted to 802.3, delivered to networking stack
        • management: delivered to MLME
------------------------------------------------------------------------

My question is which function actually identifies the types of frame and
transmit to RX, data handler and MLME.


Yunong Pang
Regards,