mac80211: Enhancements to dynamic power save.
Vivek Natarajan [Wed, 24 Dec 2008 02:39:02 +0000 (18:39 -0800)]
This patch enables mac80211 to send a null frame and also to
check for tim in the beacon if dynamic power save is enabled.

Signed-off-by: Vivek Natarajan <vnatarajan@atheros.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

net/mac80211/ieee80211_i.h
net/mac80211/mlme.c
net/mac80211/scan.c
net/mac80211/wext.c

index 5f8ad88..117718b 100644 (file)
@@ -987,6 +987,9 @@ u64 ieee80211_mandatory_rates(struct ieee80211_local *local,
 void ieee80211_dynamic_ps_enable_work(struct work_struct *work);
 void ieee80211_dynamic_ps_disable_work(struct work_struct *work);
 void ieee80211_dynamic_ps_timer(unsigned long data);
+void ieee80211_send_nullfunc(struct ieee80211_local *local,
+                            struct ieee80211_sub_if_data *sdata,
+                            int powersave);
 
 void ieee80211_wake_queues_by_reason(struct ieee80211_hw *hw,
                                     enum queue_stop_reason reason);
index b3c99d3..599a421 100644 (file)
@@ -575,6 +575,30 @@ static void ieee80211_sta_wmm_params(struct ieee80211_local *local,
        }
 }
 
+static bool check_tim(struct ieee802_11_elems *elems, u16 aid, bool *is_mc)
+{
+       u8 mask;
+       u8 index, indexn1, indexn2;
+       struct ieee80211_tim_ie *tim = (struct ieee80211_tim_ie *) elems->tim;
+
+       aid &= 0x3fff;
+       index = aid / 8;
+       mask  = 1 << (aid & 7);
+
+       if (tim->bitmap_ctrl & 0x01)
+               *is_mc = true;
+
+       indexn1 = tim->bitmap_ctrl & 0xfe;
+       indexn2 = elems->tim_len + indexn1 - 4;
+
+       if (index < indexn1 || index > indexn2)
+               return false;
+
+       index -= indexn1;
+
+       return !!(tim->virtual_map[index] & mask);
+}
+
 static u32 ieee80211_handle_bss_capability(struct ieee80211_sub_if_data *sdata,
                                           u16 capab, bool erp_valid, u8 erp)
 {
@@ -757,6 +781,7 @@ static void ieee80211_set_associated(struct ieee80211_sub_if_data *sdata,
                        mod_timer(&local->dynamic_ps_timer, jiffies +
                                  msecs_to_jiffies(local->dynamic_ps_timeout));
                else {
+                       ieee80211_send_nullfunc(local, sdata, 1);
                        conf->flags |= IEEE80211_CONF_PS;
                        ieee80211_hw_config(local,
                                            IEEE80211_CONF_CHANGE_PS);
@@ -1720,7 +1745,7 @@ static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata,
        struct ieee802_11_elems elems;
        struct ieee80211_local *local = sdata->local;
        u32 changed = 0;
-       bool erp_valid;
+       bool erp_valid, directed_tim, is_mc = false;
        u8 erp_value = 0;
 
        /* Process beacon from the current BSS */
@@ -1743,6 +1768,18 @@ static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata,
        ieee80211_sta_wmm_params(local, ifsta, elems.wmm_param,
                                 elems.wmm_param_len);
 
+       if (!(local->hw.flags & IEEE80211_HW_NO_STACK_DYNAMIC_PS)) {
+               directed_tim = check_tim(&elems, ifsta->aid, &is_mc);
+
+               if (directed_tim || is_mc) {
+                       if (local->hw.conf.flags && IEEE80211_CONF_PS) {
+                               local->hw.conf.flags &= ~IEEE80211_CONF_PS;
+                               ieee80211_hw_config(local,
+                                               IEEE80211_CONF_CHANGE_PS);
+                               ieee80211_send_nullfunc(local, sdata, 0);
+                       }
+               }
+       }
 
        if (elems.erp_info && elems.erp_info_len >= 1) {
                erp_valid = true;
@@ -2631,10 +2668,12 @@ void ieee80211_dynamic_ps_enable_work(struct work_struct *work)
        struct ieee80211_local *local =
                container_of(work, struct ieee80211_local,
                             dynamic_ps_enable_work);
+       struct ieee80211_sub_if_data *sdata = local->scan_sdata;
 
        if (local->hw.conf.flags & IEEE80211_CONF_PS)
                return;
 
+       ieee80211_send_nullfunc(local, sdata, 1);
        local->hw.conf.flags |= IEEE80211_CONF_PS;
 
        ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
index f5c7c33..a2caeed 100644 (file)
@@ -395,7 +395,7 @@ ieee80211_scan_rx(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb,
        return RX_QUEUED;
 }
 
-static void ieee80211_send_nullfunc(struct ieee80211_local *local,
+void ieee80211_send_nullfunc(struct ieee80211_local *local,
                                    struct ieee80211_sub_if_data *sdata,
                                    int powersave)
 {
index 8568f1e..48fc6b9 100644 (file)
@@ -871,12 +871,17 @@ set:
                        mod_timer(&local->dynamic_ps_timer, jiffies +
                                  msecs_to_jiffies(local->dynamic_ps_timeout));
                else {
-                       if (local->powersave)
+                       if (local->powersave) {
+                               ieee80211_send_nullfunc(local, sdata, 1);
                                conf->flags |= IEEE80211_CONF_PS;
-                       else
+                               ret = ieee80211_hw_config(local,
+                                               IEEE80211_CONF_CHANGE_PS);
+                       } else {
                                conf->flags &= ~IEEE80211_CONF_PS;
-                       ret = ieee80211_hw_config(local,
-                                       IEEE80211_CONF_CHANGE_PS);
+                               ret = ieee80211_hw_config(local,
+                                               IEEE80211_CONF_CHANGE_PS);
+                               ieee80211_send_nullfunc(local, sdata, 0);
+                       }
                }
        }