IEEE80211_STA_SET_BU(9) Advanced driver interface IEEE80211_STA_SET_BU(9)NAMEieee80211_sta_set_buffered - inform mac80211 about driver-buffered
frames
SYNOPSIS
void ieee80211_sta_set_buffered(struct ieee80211_sta * sta, u8 tid,
bool buffered);
ARGUMENTS
sta
struct ieee80211_sta pointer for the sleeping station
tid
the TID that has buffered frames
buffered
indicates whether or not frames are buffered for this TID
DESCRIPTION
If a driver buffers frames for a powersave station instead of passing
them back to mac80211 for retransmission, the station may still need to
be told that there are buffered frames via the TIM bit.
This function informs mac80211 whether or not there are frames that are
buffered in the driver for a given TID; mac80211 can then use this data
to set the TIM bit (NOTE: This may call back into the driver's set_tim
call! Beware of the locking!)
If all frames are released to the station (due to PS-poll or uAPSD)
then the driver needs to inform mac80211 that there no longer are
frames buffered. However, when the station wakes up mac80211 assumes
that all buffered frames will be transmitted and clears this data,
drivers need to make sure they inform mac80211 about all buffered
frames on the sleep transition (sta_notify with STA_NOTIFY_SLEEP).
Note that technically mac80211 only needs to know this per AC, not per
TID, but since driver buffering will inevitably happen per TID (since
it is related to aggregation) it is easier to make mac80211 map the TID
to the AC as required instead of keeping track in all drivers that use
this API.
AUTHOR
Johannes Berg <johannes@sipsolutions.net>
Author.
COPYRIGHTKernel Hackers Manual 3.11 November 2013 IEEE80211_STA_SET_BU(9)
