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ENUM 
IEEE80211_AMPDU(9) Advanced driver interface ENUM IEEE80211_AMPDU(9) NAME
enum_ieee80211_ampdu_mlme_action - A-MPDU actions SYNOPSIS
enum ieee80211_ampdu_mlme_action { IEEE80211_AMPDU_RX_START, IEEE80211_AMPDU_RX_STOP, IEEE80211_AMPDU_TX_START, IEEE80211_AMPDU_TX_STOP_CONT, IEEE80211_AMPDU_TX_STOP_FLUSH, IEEE80211_AMPDU_TX_STOP_FLUSH_CONT, IEEE80211_AMPDU_TX_OPERATIONAL }; CONSTANTS
IEEE80211_AMPDU_RX_START start RX aggregation IEEE80211_AMPDU_RX_STOP stop RX aggregation IEEE80211_AMPDU_TX_START start TX aggregation IEEE80211_AMPDU_TX_STOP_CONT stop TX aggregation but continue transmitting queued packets, now unaggregated. After all packets are transmitted the driver has to call ieee80211_stop_tx_ba_cb_irqsafe. IEEE80211_AMPDU_TX_STOP_FLUSH stop TX aggregation and flush all packets, called when the station is removed. There's no need or reason to call ieee80211_stop_tx_ba_cb_irqsafe in this case as mac80211 assumes the session is gone and removes the station. IEEE80211_AMPDU_TX_STOP_FLUSH_CONT called when TX aggregation is stopped but the driver hasn't called ieee80211_stop_tx_ba_cb_irqsafe yet and now the connection is dropped and the station will be removed. Drivers should clean up and drop remaining packets when this is called. IEEE80211_AMPDU_TX_OPERATIONAL TX aggregation has become operational DESCRIPTION
These flags are used with the ampdu_action callback in struct ieee80211_ops to indicate which action is needed. Note that drivers MUST be able to deal with a TX aggregation session being stopped even before they OK'ed starting it by calling ieee80211_start_tx_ba_cb_irqsafe, because the peer might receive the addBA frame and send a delBA right away! AUTHOR
Johannes Berg <johannes@sipsolutions.net> Author. COPYRIGHT
Kernel Hackers Manual 3.10 June 2014 ENUM IEEE80211_AMPDU(9)

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