mac80211: Add support for connection quality monitoring

Add support for the set_cqm_config op. This op function configures the
requested connection quality monitor rssi threshold and rssi hysteresis
values to the hardware  if the hardware supports
IEEE80211_HW_SUPPORTS_CQM.

For unsupported hardware, currently -EOPNOTSUPP is returned, so the mac80211
is currently not doing connection quality monitoring on the host. This could be
added later, if needed.

Signed-off-by: Juuso Oikarinen <juuso.oikarinen@nokia.com>
Reviewed-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 27 insertions, 0 deletions

diff --git a/net/mac80211/cfg.c b/net/mac80211/cfg.c
index b7116ef84a3b..c8f520529eec 100644
--- a/net/mac80211/cfg.c
+++ b/net/mac80211/cfg.c
@@ -1402,6 +1402,32 @@ static int ieee80211_set_power_mgmt(struct wiphy *wiphy, struct net_device *dev,
         return 0;
 }
 
+static int ieee80211_set_cqm_rssi_config(struct wiphy *wiphy,
+                                         struct net_device *dev,
+                                         s32 rssi_thold, u32 rssi_hyst)
+{
+        struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
+        struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
+        struct ieee80211_vif *vif = &sdata->vif;
+        struct ieee80211_bss_conf *bss_conf = &vif->bss_conf;
+
+        if (!(local->hw.flags & IEEE80211_HW_SUPPORTS_CQM_RSSI))
+                return -EOPNOTSUPP;
+
+        if (rssi_thold == bss_conf->cqm_rssi_thold &&
+            rssi_hyst == bss_conf->cqm_rssi_hyst)
+                return 0;
+
+        bss_conf->cqm_rssi_thold = rssi_thold;
+        bss_conf->cqm_rssi_hyst = rssi_hyst;
+
+        /* tell the driver upon association, unless already associated */
+        if (sdata->u.mgd.associated)
+                ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_CQM);
+
+        return 0;
+}
+
 static int ieee80211_set_bitrate_mask(struct wiphy *wiphy,
                                       struct net_device *dev,
                                       const u8 *addr,
@@ -1506,4 +1532,5 @@ struct cfg80211_ops mac80211_config_ops = {
         .remain_on_channel = ieee80211_remain_on_channel,
         .cancel_remain_on_channel = ieee80211_cancel_remain_on_channel,
         .action = ieee80211_action,
+        .set_cqm_rssi_config = ieee80211_set_cqm_rssi_config,
 };