ath10k channel in tx process

[정승현]

Hi all,
 
I am trying to figure out how ath10k (operating in AP mode) handles the channel on which an AP sends packets to one of its associated stations. I have found a few  functions including ath10k_sta_state set channel information for each station, but I couldn't find out which function(s) utilize the information while tx processing. Is there any function for channel selection while processing tx?
 
BTW, Does ath10k support broadcast and multicast? or always convert them into unicast? If it supports broadcast and multicast, does it always use 20MHz?