Question about priority transmission queues in code level.

I am doing a project about madwifi recently, something in packet QOS in mac
level. 

I want to schedule the packet with my own new algorithm, so I go through the
code about packet transmission in madwifi. Here comes a question that I have
found madwifi had set up 4 priority queues to buf data from upper layer, but
I donot find the selecting mechanism when the packet being send out. 

In ath_tx_start packet txq has been select, then it calls ath_tx_txqaddbuf
to insert a buffer on a txq. As QOS has set up packet with higher priority
should be sent firstly, but I did not see any codes doing these mechanism.

As I am newbie to driver programming, need some helps of you guys.

Any suggestions to my problem? Any help would be greatly appreciated.
Thanks!

Leo



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