mac80211: sample survey implementation for mac80211 & hwsim

This adds the survey function to both mac80211 itself and to mac80211_hwsim.
For the latter driver, we simply invent some noise level.A real driver which
cannot determine the real channel noise MUST NOT report any noise, especially
not a magically conjured one :-)

Signed-off-by: Holger Schurig <holgerschurig@gmail.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

2 files changed, 21 insertions, 0 deletions

diff --git a/net/mac80211/cfg.c b/net/mac80211/cfg.c
index 4edd73cbf052..f97dda735cbb 100644
--- a/net/mac80211/cfg.c
+++ b/net/mac80211/cfg.c
@@ -410,6 +410,17 @@ static int ieee80211_dump_station(struct wiphy *wiphy, struct net_device *dev,
         return ret;
 }
 
+static int ieee80211_dump_survey(struct wiphy *wiphy, struct net_device *dev,
+                                 int idx, struct survey_info *survey)
+{
+        struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
+
+        if (!local->ops->get_survey)
+                return -EOPNOTSUPP;
+
+        return drv_get_survey(local, idx, survey);
+}
+
 static int ieee80211_get_station(struct wiphy *wiphy, struct net_device *dev,
                                  u8 *mac, struct station_info *sinfo)
 {
@@ -1507,6 +1518,7 @@ struct cfg80211_ops mac80211_config_ops = {
         .change_station = ieee80211_change_station,
         .get_station = ieee80211_get_station,
         .dump_station = ieee80211_dump_station,
+        .dump_survey = ieee80211_dump_survey,
 #ifdef CONFIG_MAC80211_MESH
         .add_mpath = ieee80211_add_mpath,
         .del_mpath = ieee80211_del_mpath,
diff --git a/net/mac80211/driver-ops.h b/net/mac80211/driver-ops.h
index c3d844093a2f..d1f8a7c2225a 100644
--- a/net/mac80211/driver-ops.h
+++ b/net/mac80211/driver-ops.h
@@ -346,6 +346,15 @@ static inline int drv_ampdu_action(struct ieee80211_local *local,
         return ret;
 }
 
+static inline int drv_get_survey(struct ieee80211_local *local, int idx,
+                                struct survey_info *survey)
+{
+        int ret = -EOPNOTSUPP;
+        if (local->ops->conf_tx)
+                ret = local->ops->get_survey(&local->hw, idx, survey);
+        /* trace_drv_get_survey(local, idx, survey, ret); */
+        return ret;
+}
 
 static inline void drv_rfkill_poll(struct ieee80211_local *local)
 {