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, 18 insertions, 0 deletions

diff --git a/include/linux/ieee80211.h b/include/linux/ieee80211.h
index 602c0692c3fc..a8c6069a0d9f 100644
--- a/include/linux/ieee80211.h
+++ b/include/linux/ieee80211.h
@@ -120,6 +120,24 @@
 #define IEEE80211_QOS_CTL_TID_MASK      0x000F
 #define IEEE80211_QOS_CTL_TAG1D_MASK    0x0007
 
+/* U-APSD queue for WMM IEs sent by AP */
+#define IEEE80211_WMM_IE_AP_QOSINFO_UAPSD       (1<<7)
+
+/* U-APSD queues for WMM IEs sent by STA */
+#define IEEE80211_WMM_IE_STA_QOSINFO_AC_VO      (1<<0)
+#define IEEE80211_WMM_IE_STA_QOSINFO_AC_VI      (1<<1)
+#define IEEE80211_WMM_IE_STA_QOSINFO_AC_BK      (1<<2)
+#define IEEE80211_WMM_IE_STA_QOSINFO_AC_BE      (1<<3)
+#define IEEE80211_WMM_IE_STA_QOSINFO_AC_MASK    0x0f
+
+/* U-APSD max SP length for WMM IEs sent by STA */
+#define IEEE80211_WMM_IE_STA_QOSINFO_SP_ALL     0x00
+#define IEEE80211_WMM_IE_STA_QOSINFO_SP_2       0x01
+#define IEEE80211_WMM_IE_STA_QOSINFO_SP_4       0x02
+#define IEEE80211_WMM_IE_STA_QOSINFO_SP_6       0x03
+#define IEEE80211_WMM_IE_STA_QOSINFO_SP_MASK    0x03
+#define IEEE80211_WMM_IE_STA_QOSINFO_SP_SHIFT   5
+
 struct ieee80211_hdr {
         __le16 frame_control;
         __le16 duration_id;