This documents what's required to implement that TX powersave
filter properly wrt. handling hardware queues.
Signed-off-by: Johannes Berg <johannes@xxxxxxxxxxxxxxxx>
---
include/net/mac80211.h | 9 ++++++++-
1 file changed, 8 insertions(+), 1 deletion(-)
--- wireless-testing.orig/include/net/mac80211.h 2009-08-07 16:24:58.000000000 +0200
+++ wireless-testing/include/net/mac80211.h 2009-08-07 16:26:46.000000000 +0200
@@ -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.
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