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, 12 insertions, 1 deletions

diff --git a/net/mac80211/ieee80211_i.h b/net/mac80211/ieee80211_i.h
index 3e4ac3f30857..3468e378509a 100644
--- a/net/mac80211/ieee80211_i.h
+++ b/net/mac80211/ieee80211_i.h
@@ -58,6 +58,15 @@ struct ieee80211_local;
 
 #define TU_TO_EXP_TIME(x)       (jiffies + usecs_to_jiffies((x) * 1024))
 
+#define IEEE80211_DEFAULT_UAPSD_QUEUES \
+        (IEEE80211_WMM_IE_STA_QOSINFO_AC_BK |   \
+         IEEE80211_WMM_IE_STA_QOSINFO_AC_BE |   \
+         IEEE80211_WMM_IE_STA_QOSINFO_AC_VI |   \
+         IEEE80211_WMM_IE_STA_QOSINFO_AC_VO)
+
+#define IEEE80211_DEFAULT_MAX_SP_LEN            \
+        IEEE80211_WMM_IE_STA_QOSINFO_SP_ALL
+
 struct ieee80211_fragment_entry {
         unsigned long first_frag_time;
         unsigned int seq;
@@ -78,6 +87,7 @@ struct ieee80211_bss {
         u8 dtim_period;
 
         bool wmm_used;
+        bool uapsd_supported;
 
         unsigned long last_probe_resp;
 
@@ -285,7 +295,7 @@ struct ieee80211_work {
                         u8 ssid[IEEE80211_MAX_SSID_LEN];
                         u8 ssid_len;
                         u8 supp_rates_len;
-                        bool wmm_used, use_11n;
+                        bool wmm_used, use_11n, uapsd_used;
                 } assoc;
                 struct {
                         u32 duration;
@@ -306,6 +316,7 @@ enum ieee80211_sta_flags {
         IEEE80211_STA_DISABLE_11N       = BIT(4),
         IEEE80211_STA_CSA_RECEIVED      = BIT(5),
         IEEE80211_STA_MFP_ENABLED       = BIT(6),
+        IEEE80211_STA_UAPSD_ENABLED     = BIT(7),
 };
 
 struct ieee80211_if_managed {