mac80211: add driver RSSI threshold events

mac80211 maintains a running average of the RSSI when a STA
is associated to an AP. Report threshold events to any driver
that has registered callbacks for getting RSSI measurements.

Implement callbacks in mac80211 so that driver can set thresholds.
Add callbacks in mac80211 which is invoked when an RSSI threshold
event occurs.

mac80211: add tracing to rssi_reports api and remove extraneous fn argument
mac80211: scale up rssi thresholds from driver by 16 before storing

Signed-off-by: Meenakshi Venkataraman <meenakshi.venkataraman@intel.com>
Signed-off-by: Wey-Yi Guy <wey-yi.w.guy@intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 46 insertions, 0 deletions

diff --git a/net/mac80211/driver-trace.h b/net/mac80211/driver-trace.h
index 31a9dfa81f65..4470f6e8b845 100644
--- a/net/mac80211/driver-trace.h
+++ b/net/mac80211/driver-trace.h
@@ -1052,6 +1052,28 @@ TRACE_EVENT(drv_set_rekey_data,
                   LOCAL_PR_ARG, VIF_PR_ARG)
 );
 
+TRACE_EVENT(drv_rssi_callback,
+        TP_PROTO(struct ieee80211_local *local,
+                 enum ieee80211_rssi_event rssi_event),
+
+        TP_ARGS(local, rssi_event),
+
+        TP_STRUCT__entry(
+                LOCAL_ENTRY
+                __field(u32, rssi_event)
+        ),
+
+        TP_fast_assign(
+                LOCAL_ASSIGN;
+                __entry->rssi_event = rssi_event;
+        ),
+
+        TP_printk(
+                LOCAL_PR_FMT " rssi_event:%d",
+                LOCAL_PR_ARG, __entry->rssi_event
+        )
+);
+
 /*
  * Tracing for API calls that drivers call.
  */
@@ -1342,6 +1364,30 @@ TRACE_EVENT(api_gtk_rekey_notify,
         TP_printk(VIF_PR_FMT, VIF_PR_ARG)
 );
 
+TRACE_EVENT(api_enable_rssi_reports,
+        TP_PROTO(struct ieee80211_sub_if_data *sdata,
+                 int rssi_min_thold, int rssi_max_thold),
+
+        TP_ARGS(sdata, rssi_min_thold, rssi_max_thold),
+
+        TP_STRUCT__entry(
+                VIF_ENTRY
+                __field(int, rssi_min_thold)
+                __field(int, rssi_max_thold)
+        ),
+
+        TP_fast_assign(
+                VIF_ASSIGN;
+                __entry->rssi_min_thold = rssi_min_thold;
+                __entry->rssi_max_thold = rssi_max_thold;
+        ),
+
+        TP_printk(
+                VIF_PR_FMT " rssi_min_thold =%d, rssi_max_thold = %d",
+                VIF_PR_ARG, __entry->rssi_min_thold, __entry->rssi_max_thold
+        )
+);
+
 /*
  * Tracing for internal functions
  * (which may also be called in response to driver calls)