mac80211: Add support for beacon report radio measurement

Add the following to support beacon report radio measurement
with the measurement mode field set to passive or active:
1. Propagate the required scan duration to the device
2. Report the scan start time (in terms of TSF)
3. Report each BSS's detection time (also in terms of TSF)

TSF times refer to the BSS that the interface that requested the
scan is connected to.

Signed-off-by: Assaf Krauss <assaf.krauss@intel.com>
Signed-off-by: Avraham Stern <avraham.stern@intel.com>
[changed ath9k/10k, at76c59x-usb, iwlegacy, wl1251 and wlcore to match
the new API]
Signed-off-by: Luca Coelho <luciano.coelho@intel.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

2 files changed, 35 insertions, 8 deletions

diff --git a/net/mac80211/ieee80211_i.h b/net/mac80211/ieee80211_i.h
index 54edfb6fc1d1..f56d342c31b8 100644
--- a/net/mac80211/ieee80211_i.h
+++ b/net/mac80211/ieee80211_i.h
@@ -1250,6 +1250,7 @@ struct ieee80211_local {
         int scan_channel_idx;
         int scan_ies_len;
         int hw_scan_ies_bufsize;
+        struct cfg80211_scan_info scan_info;
 
         struct work_struct sched_scan_stopped_work;
         struct ieee80211_sub_if_data __rcu *sched_scan_sdata;
diff --git a/net/mac80211/scan.c b/net/mac80211/scan.c
index 4ec1c52a1549..8d4a9cd8a39a 100644
--- a/net/mac80211/scan.c
+++ b/net/mac80211/scan.c
@@ -7,6 +7,7 @@
  * Copyright 2006-2007  Jiri Benc <jbenc@suse.cz>
  * Copyright 2007, Michael Wu <flamingice@sourmilk.net>
  * Copyright 2013-2015  Intel Mobile Communications GmbH
+ * Copyright 2016  Intel Deutschland GmbH
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License version 2 as
@@ -70,6 +71,7 @@ ieee80211_bss_info_update(struct ieee80211_local *local,
                 .boottime_ns = rx_status->boottime_ns,
         };
         bool signal_valid;
+        struct ieee80211_sub_if_data *scan_sdata;
 
         if (ieee80211_hw_check(&local->hw, SIGNAL_DBM))
                 bss_meta.signal = rx_status->signal * 100;
@@ -83,6 +85,20 @@ ieee80211_bss_info_update(struct ieee80211_local *local,
                 bss_meta.scan_width = NL80211_BSS_CHAN_WIDTH_10;
 
         bss_meta.chan = channel;
+
+        rcu_read_lock();
+        scan_sdata = rcu_dereference(local->scan_sdata);
+        if (scan_sdata && scan_sdata->vif.type == NL80211_IFTYPE_STATION &&
+            scan_sdata->vif.bss_conf.assoc &&
+            ieee80211_have_rx_timestamp(rx_status)) {
+                bss_meta.parent_tsf =
+                        ieee80211_calculate_rx_timestamp(local, rx_status,
+                                                         len + FCS_LEN, 24);
+                ether_addr_copy(bss_meta.parent_bssid,
+                                scan_sdata->vif.bss_conf.bssid);
+        }
+        rcu_read_unlock();
+
         cbss = cfg80211_inform_bss_frame_data(local->hw.wiphy, &bss_meta,
                                               mgmt, len, GFP_ATOMIC);
         if (!cbss)
@@ -345,6 +361,11 @@ static void __ieee80211_scan_completed(struct ieee80211_hw *hw, bool aborted)
 
                 if (rc == 0)
                         return;
+
+                /* HW scan failed and is going to be reported as done, so clear
+                 * old scan info.
+                 */
+                memset(&local->scan_info, 0, sizeof(local->scan_info));
         }
 
         kfree(local->hw_scan_req);
@@ -354,11 +375,8 @@ static void __ieee80211_scan_completed(struct ieee80211_hw *hw, bool aborted)
                                              lockdep_is_held(&local->mtx));
 
         if (scan_req != local->int_scan_req) {
-                struct cfg80211_scan_info info = {
-                        .aborted = aborted,
-                };
-
-                cfg80211_scan_done(scan_req, &info);
+                local->scan_info.aborted = aborted;
+                cfg80211_scan_done(scan_req, &local->scan_info);
         }
         RCU_INIT_POINTER(local->scan_req, NULL);
 
@@ -396,15 +414,19 @@ static void __ieee80211_scan_completed(struct ieee80211_hw *hw, bool aborted)
                 ieee80211_start_next_roc(local);
 }
 
-void ieee80211_scan_completed(struct ieee80211_hw *hw, bool aborted)
+void ieee80211_scan_completed(struct ieee80211_hw *hw,
+                              struct cfg80211_scan_info *info)
 {
         struct ieee80211_local *local = hw_to_local(hw);
 
-        trace_api_scan_completed(local, aborted);
+        trace_api_scan_completed(local, info);
 
         set_bit(SCAN_COMPLETED, &local->scanning);
-        if (aborted)
+        if (info->aborted)
                 set_bit(SCAN_ABORTED, &local->scanning);
+
+        memcpy(&local->scan_info, info, sizeof(*info));
+
         ieee80211_queue_delayed_work(&local->hw, &local->scan_work, 0);
 }
 EXPORT_SYMBOL(ieee80211_scan_completed);
@@ -571,6 +593,9 @@ static int __ieee80211_start_scan(struct ieee80211_sub_if_data *sdata,
                 local->hw_scan_req->req.ie = ies;
                 local->hw_scan_req->req.flags = req->flags;
                 eth_broadcast_addr(local->hw_scan_req->req.bssid);
+                local->hw_scan_req->req.duration = req->duration;
+                local->hw_scan_req->req.duration_mandatory =
+                        req->duration_mandatory;
 
                 local->hw_scan_band = 0;
 
@@ -1078,6 +1103,7 @@ void ieee80211_scan_cancel(struct ieee80211_local *local)
          */
         cancel_delayed_work(&local->scan_work);
         /* and clean up */
+        memset(&local->scan_info, 0, sizeof(local->scan_info));
         __ieee80211_scan_completed(&local->hw, true);
 out:
         mutex_unlock(&local->mtx);