Decrease buffer size Post: 302609267

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ieee80211_sta_set_buffered

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@sipsolutions.net>
	   Author.

COPYRIGHT

Kernel Hackers Manual 3.10					     June 2014						   IEEE80211_STA_SET_BU(9)

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