mac80211: add U-APSD client support

Add Unscheduled Automatic Power-Save Delivery (U-APSD) client support. The
idea is that the data frames from the client trigger AP to send the buffered
frames with ACs which have U-APSD enabled. This decreases latency and makes it
possible to save even more power.

Driver needs to use IEEE80211_HW_UAPSD to enable the feature. The current
implementation assumes that firmware takes care of the wakeup and
hardware needing IEEE80211_HW_PS_NULLFUNC_STACK is not yet supported.

Tested with wl1251 on a Nokia N900 and Cisco Aironet 1231G AP and running
various test traffic with ping.

Signed-off-by: Kalle Valo <kalle.valo@nokia.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 7 insertions, 0 deletions

diff --git a/include/net/mac80211.h b/include/net/mac80211.h
index e1e73c6abeff..f313a3cbabda 100644
--- a/include/net/mac80211.h
+++ b/include/net/mac80211.h
@@ -113,6 +113,7 @@ struct ieee80211_tx_queue_params {
         u16 cw_min;
         u16 cw_max;
         u8 aifs;
+        bool uapsd;
 };
 
 /**
@@ -929,6 +930,11 @@ enum ieee80211_tkip_key_type {
  *      Hardware supports dynamic spatial multiplexing powersave,
  *      ie. can turn off all but one chain and then wake the rest
  *      up as required after, for example, rts/cts handshake.
+ *
+ * @IEEE80211_HW_SUPPORTS_UAPSD:
+ *      Hardware supports Unscheduled Automatic Power Save Delivery
+ *      (U-APSD) in managed mode. The mode is configured with
+ *      conf_tx() operation.
  */
 enum ieee80211_hw_flags {
         IEEE80211_HW_HAS_RATE_CONTROL                   = 1<<0,
@@ -948,6 +954,7 @@ enum ieee80211_hw_flags {
         IEEE80211_HW_BEACON_FILTER                      = 1<<14,
         IEEE80211_HW_SUPPORTS_STATIC_SMPS               = 1<<15,
         IEEE80211_HW_SUPPORTS_DYNAMIC_SMPS              = 1<<16,
+        IEEE80211_HW_SUPPORTS_UAPSD                     = 1<<17,
 };
 
 /**