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>

diff --git a/include/linux/ieee80211.h b/include/linux/ieee80211.h
index a1630ba..7f4df7c 100644 (file)
--- a/include/linux/ieee80211.h
+++ b/include/linux/ieee80211.h
@@ -506,6 +506,19 @@ struct ieee80211_channel_sw_ie {
        u8 count;
 } __attribute__ ((packed));
 
+/**
+ * struct ieee80211_tim
+ *
+ * This structure refers to "Traffic Indication Map information element"
+ */
+struct ieee80211_tim_ie {
+       u8 dtim_count;
+       u8 dtim_period;
+       u8 bitmap_ctrl;
+       /* variable size: 1 - 251 bytes */
+       u8 virtual_map[0];
+} __attribute__ ((packed));
+
 struct ieee80211_mgmt {
        __le16 frame_control;
        __le16 duration;

diff --git a/include/net/mac80211.h b/include/net/mac80211.h
index b527210..9d99f2e 100644 (file)
--- a/include/net/mac80211.h
+++ b/include/net/mac80211.h
@@ -177,9 +177,10 @@ enum ieee80211_bss_change {
  * @aid: association ID number, valid only when @assoc is true
  * @use_cts_prot: use CTS protection
  * @use_short_preamble: use 802.11b short preamble
+ * @dtim_period: num of beacons before the next DTIM, for PSM
  * @timestamp: beacon timestamp
  * @beacon_int: beacon interval
- * @assoc_capability: capabbilities taken from assoc resp
+ * @assoc_capability: capabilities taken from assoc resp
  * @assoc_ht: association in HT mode
  * @ht_conf: ht capabilities
  * @ht_bss_conf: ht extended capabilities
@@ -191,6 +192,7 @@ struct ieee80211_bss_conf {
        /* erp related data */
        bool use_cts_prot;
        bool use_short_preamble;
+       u8 dtim_period;
        u16 beacon_int;
        u16 assoc_capability;
        u64 timestamp;

diff --git a/net/mac80211/ieee80211_i.h b/net/mac80211/ieee80211_i.h
index a2e200f..ec59345 100644 (file)
--- 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 acb0413..591e633 100644 (file)
--- 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;