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Commit 66572cfc authored by Victor Goldenshtein's avatar Victor Goldenshtein Committed by Johannes Berg
Browse files

mac80211: add command to get current rssi 



Get current rssi (in dBm) from the driver/FW.

Instead of reporting the signal received in the last
rx packet, which might be inaccurate if rx traffic is
low and beacon filtering is enabled, get the signal
from the driver/FW.

Signed-off-by: default avatarVictor Goldenshtein <victorg@ti.com>
Signed-off-by: default avatarJohannes Berg <johannes.berg@intel.com>
parent 0f6b3f59

include/net/mac80211.h

+5 −0
Original line number Diff line number Diff line
@@ -2249,6 +2249,9 @@ enum ieee80211_rate_control_changed { 
 * @get_et_strings:  Ethtool API to get a set of strings to describe stats

 *	and perhaps other supported types of ethtool data-sets.

 *

 * @get_rssi: Get current signal strength in dBm, the function is optional

 *	and can sleep.

 *

 */

struct ieee80211_ops {

	void (*tx)(struct ieee80211_hw *hw, struct sk_buff *skb);
@@ -2388,6 +2391,8 @@ struct ieee80211_ops { 
	void	(*get_et_strings)(struct ieee80211_hw *hw,

				  struct ieee80211_vif *vif,

				  u32 sset, u8 *data);

	int	(*get_rssi)(struct ieee80211_hw *hw, struct ieee80211_vif *vif,

			    struct ieee80211_sta *sta, s8 *rssi_dbm);

};



/**

net/mac80211/cfg.c

+13 −8
Original line number Diff line number Diff line
@@ -353,6 +353,7 @@ void sta_set_rate_info_tx(struct sta_info *sta, 
static void sta_set_sinfo(struct sta_info *sta, struct station_info *sinfo)

{

	struct ieee80211_sub_if_data *sdata = sta->sdata;

	struct ieee80211_local *local = sdata->local;

	struct timespec uptime;



	sinfo->generation = sdata->local->sta_generation;
@@ -388,6 +389,8 @@ static void sta_set_sinfo(struct sta_info *sta, struct station_info *sinfo) 
	if ((sta->local->hw.flags & IEEE80211_HW_SIGNAL_DBM) ||

	    (sta->local->hw.flags & IEEE80211_HW_SIGNAL_UNSPEC)) {

		sinfo->filled |= STATION_INFO_SIGNAL | STATION_INFO_SIGNAL_AVG;

		if (!local->ops->get_rssi ||

		    drv_get_rssi(local, sdata, &sta->sta, &sinfo->signal))

			sinfo->signal = (s8)sta->last_signal;

		sinfo->signal_avg = (s8) -ewma_read(&sta->avg_signal);

	}
@@ -517,7 +520,7 @@ static void ieee80211_get_et_stats(struct wiphy *wiphy, 
	 * network device.

	 */



	rcu_read_lock();

	mutex_lock(&local->sta_mtx);



	if (sdata->vif.type == NL80211_IFTYPE_STATION) {

		sta = sta_info_get_bss(sdata, sdata->u.mgd.bssid);
@@ -546,7 +549,7 @@ static void ieee80211_get_et_stats(struct wiphy *wiphy, 
			data[i] = (u8)sinfo.signal_avg;

		i++;

	} else {

		list_for_each_entry_rcu(sta, &local->sta_list, list) {

		list_for_each_entry(sta, &local->sta_list, list) {

			/* Make sure this station belongs to the proper dev */

			if (sta->sdata->dev != dev)

				continue;
@@ -603,7 +606,7 @@ static void ieee80211_get_et_stats(struct wiphy *wiphy, 
	else

		data[i++] = -1LL;



	rcu_read_unlock();

	mutex_unlock(&local->sta_mtx);



	if (WARN_ON(i != STA_STATS_LEN))

		return;
@@ -629,10 +632,11 @@ static int ieee80211_dump_station(struct wiphy *wiphy, struct net_device *dev, 
				 int idx, u8 *mac, struct station_info *sinfo)

{

	struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);

	struct ieee80211_local *local = sdata->local;

	struct sta_info *sta;

	int ret = -ENOENT;



	rcu_read_lock();

	mutex_lock(&local->sta_mtx);



	sta = sta_info_get_by_idx(sdata, idx);

	if (sta) {
@@ -641,7 +645,7 @@ static int ieee80211_dump_station(struct wiphy *wiphy, struct net_device *dev, 
		sta_set_sinfo(sta, sinfo);

	}



	rcu_read_unlock();

	mutex_unlock(&local->sta_mtx);



	return ret;

}
@@ -658,10 +662,11 @@ static int ieee80211_get_station(struct wiphy *wiphy, struct net_device *dev, 
				 u8 *mac, struct station_info *sinfo)

{

	struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);

	struct ieee80211_local *local = sdata->local;

	struct sta_info *sta;

	int ret = -ENOENT;



	rcu_read_lock();

	mutex_lock(&local->sta_mtx);



	sta = sta_info_get_bss(sdata, mac);

	if (sta) {
@@ -669,7 +674,7 @@ static int ieee80211_get_station(struct wiphy *wiphy, struct net_device *dev, 
		sta_set_sinfo(sta, sinfo);

	}



	rcu_read_unlock();

	mutex_unlock(&local->sta_mtx);



	return ret;

}

net/mac80211/driver-ops.h

+15 −0
Original line number Diff line number Diff line
@@ -845,4 +845,19 @@ drv_allow_buffered_frames(struct ieee80211_local *local, 
						  more_data);

	trace_drv_return_void(local);

}



static inline int drv_get_rssi(struct ieee80211_local *local,

				struct ieee80211_sub_if_data *sdata,

				struct ieee80211_sta *sta,

				s8 *rssi_dbm)

{

	int ret;



	might_sleep();



	ret = local->ops->get_rssi(&local->hw, &sdata->vif, sta, rssi_dbm);

	trace_drv_get_rssi(local, sta, *rssi_dbm, ret);



	return ret;

}

#endif /* __MAC80211_DRIVER_OPS */

net/mac80211/driver-trace.h

+26 −0
Original line number Diff line number Diff line
@@ -1218,6 +1218,32 @@ DEFINE_EVENT(release_evt, drv_allow_buffered_frames, 
	TP_ARGS(local, sta, tids, num_frames, reason, more_data)

);



TRACE_EVENT(drv_get_rssi,

	TP_PROTO(struct ieee80211_local *local, struct ieee80211_sta *sta,

		 s8 rssi, int ret),



	TP_ARGS(local, sta, rssi, ret),



	TP_STRUCT__entry(

		LOCAL_ENTRY

		STA_ENTRY

		__field(s8, rssi)

		__field(int, ret)

	),



	TP_fast_assign(

		LOCAL_ASSIGN;

		STA_ASSIGN;

		__entry->rssi = rssi;

		__entry->ret = ret;

	),



	TP_printk(

		LOCAL_PR_FMT STA_PR_FMT " rssi:%d ret:%d",

		LOCAL_PR_ARG, STA_PR_ARG, __entry->rssi, __entry->ret

	)

);



/*

 * Tracing for API calls that drivers call.

 */