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Commit ab5b5342 authored by Johannes Berg's avatar Johannes Berg Committed by John W. Linville
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mac80211: document TX powersave filter requirements 



This documents what's required to implement that TX powersave
filter properly wrt. handling hardware queues.

Signed-off-by: default avatarJohannes Berg <johannes@sipsolutions.net>
Signed-off-by: default avatarJohn W. Linville <linville@tuxdriver.com>
parent c555b9b3

include/net/mac80211.h

+8 −1
Original line number Diff line number Diff line
@@ -239,7 +239,14 @@ struct ieee80211_bss_conf { 
 * @IEEE80211_TX_CTL_AMPDU: this frame should be sent as part of an A-MPDU

 * @IEEE80211_TX_CTL_INJECTED: Frame was injected, internal to mac80211.

 * @IEEE80211_TX_STAT_TX_FILTERED: The frame was not transmitted

 *	because the destination STA was in powersave mode.

 *	because the destination STA was in powersave mode. Note that to

 *	avoid race conditions, the filter must be set by the hardware or

 *	firmware upon receiving a frame that indicates that the station

 *	went to sleep (must be done on device to filter frames already on

 *	the queue) and may only be unset after mac80211 gives the OK for

 *	that by setting the IEEE80211_TX_CTL_CLEAR_PS_FILT (see above),

 *	since only then is it guaranteed that no more frames are in the

 *	hardware queue.

 * @IEEE80211_TX_STAT_ACK: Frame was acknowledged

 * @IEEE80211_TX_STAT_AMPDU: The frame was aggregated, so status

 * 	is for the whole aggregation.