enum ieee80211_tx_queue — transmit queue number
enum ieee80211_tx_queue { IEEE80211_TX_QUEUE_DATA0, IEEE80211_TX_QUEUE_DATA1, IEEE80211_TX_QUEUE_DATA2, IEEE80211_TX_QUEUE_DATA3, IEEE80211_TX_QUEUE_DATA4, IEEE80211_TX_QUEUE_SVP, NUM_TX_DATA_QUEUES, IEEE80211_TX_QUEUE_AFTER_BEACON, IEEE80211_TX_QUEUE_BEACON, NUM_TX_DATA_QUEUES_AMPDU };
data queue 0
data queue 1
data queue 2
data queue 3
data queue 4
??
number of data queues
transmit queue for frames to be sent after a beacon
transmit queue for beacon frames
adding more queues for A-MPDU