IEEE80211_STA_SET_BU(9)             Advanced driver interface             IEEE80211_STA_SET_BU(9)



NAME
       ieee80211_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 AT sipsolutions.net>
           Author.

COPYRIGHT
Kernel Hackers Manual 4.8.                 January 2017                   IEEE80211_STA_SET_BU(9)