cfg80211: Add connection quality monitoring support to nl80211

Add support for basic configuration of a connection quality monitoring to the
nl80211 interface, and basic support for notifying about triggered monitoring
events.

Via this interface a user-space connection manager may configure and receive
pre-warning events of deteriorating WLAN connection quality, and start
preparing for roaming in advance, before the connection is already lost.

An example usage of such a trigger is starting scanning for nearby AP's in
an attempt to find one with better connection quality, and associate to it
before the connection characteristics of the existing connection become too bad
or the association is even lost, leading in a prolonged delay in connectivity.

The interface currently supports only RSSI, but it could be later extended
to include other parameters, such as signal-to-noise ratio, if need for that
arises.

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>

2 files changed, 65 insertions, 0 deletions

diff --git a/include/linux/nl80211.h b/include/linux/nl80211.h
index 28ba20fda3e2..89947597b9ce 100644
--- a/include/linux/nl80211.h
+++ b/include/linux/nl80211.h
@@ -323,6 +323,12 @@
  *      the TX command and %NL80211_ATTR_FRAME includes the contents of the
  *      frame. %NL80211_ATTR_ACK flag is included if the recipient acknowledged
  *      the frame.
+ * @NL80211_CMD_SET_CQM: Connection quality monitor configuration. This command
+ *      is used to configure connection quality monitoring notification trigger
+ *      levels.
+ * @NL80211_CMD_NOTIFY_CQM: Connection quality monitor notification. This
+ *      command is used as an event to indicate the that a trigger level was
+ *      reached.
  *
  * @NL80211_CMD_MAX: highest used command number
  * @__NL80211_CMD_AFTER_LAST: internal use
@@ -419,6 +425,9 @@ enum nl80211_commands {
         NL80211_CMD_SET_POWER_SAVE,
         NL80211_CMD_GET_POWER_SAVE,
 
+        NL80211_CMD_SET_CQM,
+        NL80211_CMD_NOTIFY_CQM,
+
         /* add new commands above here */
 
         /* used to define NL80211_CMD_MAX below */
@@ -691,6 +700,9 @@ enum nl80211_commands {
  * @NL80211_ATTR_ACK: Flag attribute indicating that the frame was
  *      acknowledged by the recipient.
  *
+ * @NL80211_ATTR_CQM: connection quality monitor configuration in a
+ *      nested attribute with %NL80211_ATTR_CQM_* sub-attributes.
+ *
  * @NL80211_ATTR_MAX: highest attribute number currently defined
  * @__NL80211_ATTR_AFTER_LAST: internal use
  */
@@ -842,6 +854,8 @@ enum nl80211_attrs {
 
         NL80211_ATTR_PS_STATE,
 
+        NL80211_ATTR_CQM,
+
         /* add attributes here, update the policy in nl80211.c */
 
         __NL80211_ATTR_AFTER_LAST,
@@ -1583,4 +1597,36 @@ enum nl80211_ps_state {
         NL80211_PS_ENABLED,
 };
 
+/**
+ * enum nl80211_attr_cqm - connection quality monitor attributes
+ * @__NL80211_ATTR_CQM_INVALID: invalid
+ * @NL80211_ATTR_CQM_RSSI_THOLD: RSSI threshold in dBm (zero to disable)
+ * @NL80211_ATTR_CQM_RSSI_HYST: RSSI hysteresis in dBm
+ * @NL80211_ATTR_CQM_RSSI_THRESHOLD_EVENT: RSSI threshold event
+ * @__NL80211_ATTR_CQM_AFTER_LAST: internal
+ * @NL80211_ATTR_CQM_MAX: highest key attribute
+ */
+enum nl80211_attr_cqm {
+        __NL80211_ATTR_CQM_INVALID,
+        NL80211_ATTR_CQM_RSSI_THOLD,
+        NL80211_ATTR_CQM_RSSI_HYST,
+        NL80211_ATTR_CQM_RSSI_THRESHOLD_EVENT,
+
+        /* keep last */
+        __NL80211_ATTR_CQM_AFTER_LAST,
+        NL80211_ATTR_CQM_MAX = __NL80211_ATTR_CQM_AFTER_LAST - 1
+};
+
+/**
+ * enum nl80211_cqm_rssi_threshold_event - RSSI threshold event
+ * @NL80211_CQM_RSSI_THRESHOLD_EVENT_LOW - The RSSI level is lower than the
+ *      configured threshold
+ * @NL80211_CQM_RSSI_THRESHOLD_EVENT_HIGH - The RSSI is higher than the
+ *      configured threshold
+ */
+enum nl80211_cqm_rssi_threshold_event {
+        NL80211_CQM_RSSI_THRESHOLD_EVENT_LOW,
+        NL80211_CQM_RSSI_THRESHOLD_EVENT_HIGH,
+};
+
 #endif /* __LINUX_NL80211_H */
diff --git a/include/net/cfg80211.h b/include/net/cfg80211.h
index 3d134a1fb96b..868cfd3b9724 100644
--- a/include/net/cfg80211.h
+++ b/include/net/cfg80211.h
@@ -1007,6 +1007,7 @@ struct cfg80211_pmksa {
  *      RSN IE. It allows for faster roaming between WPA2 BSSIDs.
  * @del_pmksa: Delete a cached PMKID.
  * @flush_pmksa: Flush all cached PMKIDs.
+ * @set_cqm_rssi_config: Configure connection quality monitor RSSI threshold.
  *
  */
 struct cfg80211_ops {
@@ -1152,6 +1153,10 @@ struct cfg80211_ops {
 
         int     (*set_power_mgmt)(struct wiphy *wiphy, struct net_device *dev,
                                   bool enabled, int timeout);
+
+        int     (*set_cqm_rssi_config)(struct wiphy *wiphy,
+                                       struct net_device *dev,
+                                       s32 rssi_thold, u32 rssi_hyst);
 };
 
 /*
@@ -2337,4 +2342,18 @@ bool cfg80211_rx_action(struct net_device *dev, int freq, const u8 *buf,
 void cfg80211_action_tx_status(struct net_device *dev, u64 cookie,
                                const u8 *buf, size_t len, bool ack, gfp_t gfp);
 
+
+/**
+ * cfg80211_cqm_rssi_notify - connection quality monitoring rssi event
+ * @dev: network device
+ * @rssi_event: the triggered RSSI event
+ * @gfp: context flags
+ *
+ * This function is called when a configured connection quality monitoring
+ * rssi threshold reached event occurs.
+ */
+void cfg80211_cqm_rssi_notify(struct net_device *dev,
+                              enum nl80211_cqm_rssi_threshold_event rssi_event,
+                              gfp_t gfp);
+
 #endif /* __NET_CFG80211_H */