cfg80211: implement get_wireless_stats

By dropping the noise reporting, we can implement
wireless stats in cfg80211. We also make the
handler return NULL if we have no information,
which is possible thanks to the recent wext change.

Signed-off-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 59 insertions, 0 deletions

diff --git a/net/wireless/wext-compat.c b/net/wireless/wext-compat.c
index 3a5f999703f1..226cf8609079 100644
--- a/net/wireless/wext-compat.c
+++ b/net/wireless/wext-compat.c
@@ -1156,3 +1156,62 @@ int cfg80211_wext_giwrate(struct net_device *dev,
         return 0;
 }
 EXPORT_SYMBOL_GPL(cfg80211_wext_giwrate);
+
+/* Get wireless statistics.  Called by /proc/net/wireless and by SIOCGIWSTATS */
+struct iw_statistics *cfg80211_wireless_stats(struct net_device *dev)
+{
+        struct wireless_dev *wdev = dev->ieee80211_ptr;
+        struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
+        /* we are under RTNL - globally locked - so can use static structs */
+        static struct iw_statistics wstats;
+        static struct station_info sinfo;
+        u8 *addr;
+
+        if (dev->ieee80211_ptr->iftype != NL80211_IFTYPE_STATION)
+                return NULL;
+
+        if (!rdev->ops->get_station)
+                return NULL;
+
+        addr = wdev->wext.connect.bssid;
+        if (!addr)
+                return NULL;
+
+        if (rdev->ops->get_station(&rdev->wiphy, dev, addr, &sinfo))
+                return NULL;
+
+        memset(&wstats, 0, sizeof(wstats));
+
+        switch (rdev->wiphy.signal_type) {
+        case CFG80211_SIGNAL_TYPE_MBM:
+                if (sinfo.filled & STATION_INFO_SIGNAL) {
+                        int sig = sinfo.signal;
+                        wstats.qual.updated |= IW_QUAL_LEVEL_UPDATED;
+                        wstats.qual.updated |= IW_QUAL_QUAL_UPDATED;
+                        wstats.qual.updated |= IW_QUAL_DBM;
+                        wstats.qual.level = sig;
+                        if (sig < -110)
+                                sig = -110;
+                        else if (sig > -40)
+                                sig = -40;
+                        wstats.qual.qual = sig + 110;
+                        break;
+                }
+        case CFG80211_SIGNAL_TYPE_UNSPEC:
+                if (sinfo.filled & STATION_INFO_SIGNAL) {
+                        wstats.qual.updated |= IW_QUAL_LEVEL_UPDATED;
+                        wstats.qual.updated |= IW_QUAL_QUAL_UPDATED;
+                        wstats.qual.level = sinfo.signal;
+                        wstats.qual.qual = sinfo.signal;
+                        break;
+                }
+        default:
+                wstats.qual.updated |= IW_QUAL_LEVEL_INVALID;
+                wstats.qual.updated |= IW_QUAL_QUAL_INVALID;
+        }
+
+        wstats.qual.updated |= IW_QUAL_NOISE_INVALID;
+
+        return &wstats;
+}
+EXPORT_SYMBOL_GPL(cfg80211_wireless_stats);