mac80211: enable spatial multiplexing powersave

Enable spatial multiplexing in mac80211 by telling the
driver what to do and, where necessary, sending action
frames to the AP to update the requested SMPS mode.

Also includes a trivial implementation for hwsim that
just logs the requested mode.

For now, the userspace interface is in debugfs only,
and let you toggle the requested mode at any time.

Signed-off-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 24 insertions, 1 deletions

diff --git a/include/linux/ieee80211.h b/include/linux/ieee80211.h
index d9724a28c0c2..e8d43d0ff2c3 100644
--- a/include/linux/ieee80211.h
+++ b/include/linux/ieee80211.h
@@ -707,6 +707,10 @@ struct ieee80211_mgmt {
                                         u8 action;
                                         u8 trans_id[WLAN_SA_QUERY_TR_ID_LEN];
                                 } __attribute__ ((packed)) sa_query;
+                                struct {
+                                        u8 action;
+                                        u8 smps_control;
+                                } __attribute__ ((packed)) ht_smps;
                         } u;
                 } __attribute__ ((packed)) action;
         } u;
@@ -824,6 +828,7 @@ struct ieee80211_ht_cap {
 #define IEEE80211_HT_CAP_LDPC_CODING            0x0001
 #define IEEE80211_HT_CAP_SUP_WIDTH_20_40        0x0002
 #define IEEE80211_HT_CAP_SM_PS                  0x000C
+#define         IEEE80211_HT_CAP_SM_PS_SHIFT    2
 #define IEEE80211_HT_CAP_GRN_FLD                0x0010
 #define IEEE80211_HT_CAP_SGI_20                 0x0020
 #define IEEE80211_HT_CAP_SGI_40                 0x0040
@@ -839,6 +844,7 @@ struct ieee80211_ht_cap {
 /* 802.11n HT capability AMPDU settings (for ampdu_params_info) */
 #define IEEE80211_HT_AMPDU_PARM_FACTOR          0x03
 #define IEEE80211_HT_AMPDU_PARM_DENSITY         0x1C
+#define         IEEE80211_HT_AMPDU_PARM_DENSITY_SHIFT   2
 
 /*
  * Maximum length of AMPDU that the STA can receive.
@@ -922,12 +928,17 @@ struct ieee80211_ht_info {
 #define IEEE80211_MAX_AMPDU_BUF 0x40
 
 
-/* Spatial Multiplexing Power Save Modes */
+/* Spatial Multiplexing Power Save Modes (for capability) */
 #define WLAN_HT_CAP_SM_PS_STATIC        0
 #define WLAN_HT_CAP_SM_PS_DYNAMIC       1
 #define WLAN_HT_CAP_SM_PS_INVALID       2
 #define WLAN_HT_CAP_SM_PS_DISABLED      3
 
+/* for SM power control field lower two bits */
+#define WLAN_HT_SMPS_CONTROL_DISABLED   0
+#define WLAN_HT_SMPS_CONTROL_STATIC     1
+#define WLAN_HT_SMPS_CONTROL_DYNAMIC    3
+
 /* Authentication algorithms */
 #define WLAN_AUTH_OPEN 0
 #define WLAN_AUTH_SHARED_KEY 1
@@ -1150,6 +1161,18 @@ enum ieee80211_spectrum_mgmt_actioncode {
         WLAN_ACTION_SPCT_CHL_SWITCH = 4,
 };
 
+/* HT action codes */
+enum ieee80211_ht_actioncode {
+        WLAN_HT_ACTION_NOTIFY_CHANWIDTH = 0,
+        WLAN_HT_ACTION_SMPS = 1,
+        WLAN_HT_ACTION_PSMP = 2,
+        WLAN_HT_ACTION_PCO_PHASE = 3,
+        WLAN_HT_ACTION_CSI = 4,
+        WLAN_HT_ACTION_NONCOMPRESSED_BF = 5,
+        WLAN_HT_ACTION_COMPRESSED_BF = 6,
+        WLAN_HT_ACTION_ASEL_IDX_FEEDBACK = 7,
+};
+
 /* Security key length */
 enum ieee80211_key_len {
         WLAN_KEY_LEN_WEP40 = 5,