mac80211: Track Beacon signal strength and implement cqm events

Calculate a running average of the signal strength reported for Beacon
frames and indicate cqm events if the average value moves below or
above the configured threshold value (and filter out repetitive events
with by using the configured hysteresis).

Signed-off-by: Jouni Malinen <j@w1.fi>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 12 insertions, 0 deletions

diff --git a/net/mac80211/debugfs_netdev.c b/net/mac80211/debugfs_netdev.c
index 9affe2cd185f..ee61a9f6fabc 100644
--- a/net/mac80211/debugfs_netdev.c
+++ b/net/mac80211/debugfs_netdev.c
@@ -95,6 +95,14 @@ static ssize_t ieee80211_if_fmt_##name(					\
         return scnprintf(buf, buflen, "%pM\n", sdata->field);           \
 }
 
+#define IEEE80211_IF_FMT_DEC_DIV_16(name, field)                        \
+static ssize_t ieee80211_if_fmt_##name(                                 \
+        const struct ieee80211_sub_if_data *sdata,                      \
+        char *buf, int buflen)                                          \
+{                                                                       \
+        return scnprintf(buf, buflen, "%d\n", sdata->field / 16);       \
+}
+
 #define __IEEE80211_IF_FILE(name, _write)                               \
 static ssize_t ieee80211_if_read_##name(struct file *file,              \
                                         char __user *userbuf,           \
@@ -135,6 +143,8 @@ IEEE80211_IF_FILE(rc_rateidx_mask_5ghz, rc_rateidx_mask[IEEE80211_BAND_5GHZ],
 /* STA attributes */
 IEEE80211_IF_FILE(bssid, u.mgd.bssid, MAC);
 IEEE80211_IF_FILE(aid, u.mgd.aid, DEC);
+IEEE80211_IF_FILE(last_beacon, u.mgd.last_beacon_signal, DEC);
+IEEE80211_IF_FILE(ave_beacon, u.mgd.ave_beacon_signal, DEC_DIV_16);
 
 static int ieee80211_set_smps(struct ieee80211_sub_if_data *sdata,
                               enum ieee80211_smps_mode smps_mode)
@@ -271,6 +281,8 @@ static void add_sta_files(struct ieee80211_sub_if_data *sdata)
 
         DEBUGFS_ADD(bssid);
         DEBUGFS_ADD(aid);
+        DEBUGFS_ADD(last_beacon);
+        DEBUGFS_ADD(ave_beacon);
         DEBUGFS_ADD_MODE(smps, 0600);
 }