mac80211: pass dtim_period to low level driver

This patch adds the dtim_period in ieee80211_bss_conf, this allows the low
level driver to know the dtim_period, and to plan power save accordingly.

Signed-off-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com>
Signed-off-by: Tomas Winkler <tomas.winkler@intel.com>
Signed-off-by: Zhu Yi <yi.zhu@intel.com>
Acked-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

2 files changed, 12 insertions, 0 deletions

diff --git a/net/mac80211/ieee80211_i.h b/net/mac80211/ieee80211_i.h
index a2e200f9811e..ec59345af65b 100644
--- a/net/mac80211/ieee80211_i.h
+++ b/net/mac80211/ieee80211_i.h
@@ -82,6 +82,7 @@ struct ieee80211_sta_bss {
 
         u8 bssid[ETH_ALEN];
         u8 ssid[IEEE80211_MAX_SSID_LEN];
+        u8 dtim_period;
         u16 capability; /* host byte order */
         enum ieee80211_band band;
         int freq;
diff --git a/net/mac80211/mlme.c b/net/mac80211/mlme.c
index acb04133a95d..591e6331c427 100644
--- a/net/mac80211/mlme.c
+++ b/net/mac80211/mlme.c
@@ -551,6 +551,7 @@ static void ieee80211_set_associated(struct net_device *dev,
                         /* set timing information */
                         sdata->bss_conf.beacon_int = bss->beacon_int;
                         sdata->bss_conf.timestamp = bss->timestamp;
+                        sdata->bss_conf.dtim_period = bss->dtim_period;
 
                         changed |= ieee80211_handle_bss_capability(sdata, bss);
 
@@ -2688,6 +2689,16 @@ static void ieee80211_rx_bss_info(struct net_device *dev,
         bss->beacon_int = le16_to_cpu(mgmt->u.beacon.beacon_int);
         bss->capability = le16_to_cpu(mgmt->u.beacon.capab_info);
 
+        if (elems->tim) {
+                struct ieee80211_tim_ie *tim_ie =
+                        (struct ieee80211_tim_ie *)elems->tim;
+                bss->dtim_period = tim_ie->dtim_period;
+        }
+
+        /* set default value for buggy APs */
+        if (!elems->tim || bss->dtim_period == 0)
+                bss->dtim_period = 1;
+
         bss->supp_rates_len = 0;
         if (elems->supp_rates) {
                 clen = IEEE80211_MAX_SUPP_RATES - bss->supp_rates_len;