mac80211: Enhancements to dynamic power save.
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>
diff --git a/net/mac80211/mlme.c b/net/mac80211/mlme.c
index b3c99d3..599a421 100644
--- a/net/mac80211/mlme.c
+++ b/net/mac80211/mlme.c
@@ -575,6 +575,30 @@
}
}
+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 @@
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 @@
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 @@
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 @@
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);
