nl80211: support beacon report scanning

Beacon report radio measurement requires reporting observed BSSs
on the channels specified in the beacon request. If the measurement
mode is set to passive or active, it requires actually performing a
scan (passive or active, accordingly), and reporting the time that
the scan was started and the time each beacon/probe was received
(both in terms of TSF of the BSS of the requesting AP). If the
request mode is table, this information is optional.
In addition, the radio measurement request specifies the channel
dwell time for the measurement.

In order to use scan for beacon report when the mode is active or
passive, add a parameter to scan request that specifies the
channel dwell time, and add scan start time and beacon received time
to scan results information.

Supporting beacon report is required for Multi Band Operation (MBO).

Signed-off-by: Assaf Krauss <[e-mail]>
Signed-off-by: David Spinadel <[e-mail]>
Signed-off-by: Avraham Stern <[e-mail]>
Signed-off-by: Luca Coelho <[e-mail]>
Signed-off-by: Johannes Berg <[e-mail]>

drivers/net/wireless/ath/ath6kl/cfg80211.c

···
 	struct ath6kl *ar = vif->ar;
 
 	if (vif->scan_req) {
-		cfg80211_scan_done(vif->scan_req, true);
+		struct cfg80211_scan_info info = {
+			.aborted = true,
+		};
+
+		cfg80211_scan_done(vif->scan_req, &info);
 		vif->scan_req = NULL;
 	}
 
···
 void ath6kl_cfg80211_scan_complete_event(struct ath6kl_vif *vif, bool aborted)
 {
 	struct ath6kl *ar = vif->ar;
+	struct cfg80211_scan_info info = {
+		.aborted = aborted,
+	};
 	int i;
 
 	ath6kl_dbg(ATH6KL_DBG_WLAN_CFG, "%s: status%s\n", __func__,
···
 	}
 
 out:
-	cfg80211_scan_done(vif->scan_req, aborted);
+	cfg80211_scan_done(vif->scan_req, &info);
 	vif->scan_req = NULL;
 }
 
···
 	}
 
 	if (vif->scan_req) {
-		cfg80211_scan_done(vif->scan_req, true);
+		struct cfg80211_scan_info info = {
+			.aborted = true,
+		};
+
+		cfg80211_scan_done(vif->scan_req, &info);
 		vif->scan_req = NULL;
 	}
 

drivers/net/wireless/ath/wil6210/cfg80211.c

···
 	mutex_lock(&wil->mutex);
 	started = wil_p2p_stop_discovery(wil);
 	if (started && wil->scan_request) {
-		cfg80211_scan_done(wil->scan_request, 1);
+		struct cfg80211_scan_info info = {
+			.aborted = true,
+		};
+
+		cfg80211_scan_done(wil->scan_request, &info);
 		wil->scan_request = NULL;
 		wil->radio_wdev = wil->wdev;
 	}

drivers/net/wireless/ath/wil6210/main.c

···
 	mutex_unlock(&wil->wmi_mutex);
 
 	if (wil->scan_request) {
+		struct cfg80211_scan_info info = {
+			.aborted = true,
+		};
+
 		wil_dbg_misc(wil, "Abort scan_request 0x%p\n",
 			     wil->scan_request);
 		del_timer_sync(&wil->scan_timer);
-		cfg80211_scan_done(wil->scan_request, true);
+		cfg80211_scan_done(wil->scan_request, &info);
 		wil->scan_request = NULL;
 	}
 
···
 	(void)wil_p2p_stop_discovery(wil);
 
 	if (wil->scan_request) {
+		struct cfg80211_scan_info info = {
+			.aborted = true,
+		};
+
 		wil_dbg_misc(wil, "Abort scan_request 0x%p\n",
 			     wil->scan_request);
 		del_timer_sync(&wil->scan_timer);
-		cfg80211_scan_done(wil->scan_request, true);
+		cfg80211_scan_done(wil->scan_request, &info);
 		wil->scan_request = NULL;
 	}
 

drivers/net/wireless/ath/wil6210/p2p.c

···
 	mutex_unlock(&wil->mutex);
 
 	if (started) {
+		struct cfg80211_scan_info info = {
+			.aborted = false,
+		};
+
 		mutex_lock(&wil->p2p_wdev_mutex);
-		cfg80211_scan_done(wil->scan_request, 0);
+		cfg80211_scan_done(wil->scan_request, &info);
 		wil->scan_request = NULL;
 		wil->radio_wdev = wil->wdev;
 		mutex_unlock(&wil->p2p_wdev_mutex);

drivers/net/wireless/ath/wil6210/wmi.c

···
 {
 	if (wil->scan_request) {
 		struct wmi_scan_complete_event *data = d;
-		bool aborted = (data->status != WMI_SCAN_SUCCESS);
+		struct cfg80211_scan_info info = {
+			.aborted = (data->status != WMI_SCAN_SUCCESS),
+		};
 
 		wil_dbg_wmi(wil, "SCAN_COMPLETE(0x%08x)\n", data->status);
 		wil_dbg_misc(wil, "Complete scan_request 0x%p aborted %d\n",
-			     wil->scan_request, aborted);
+			     wil->scan_request, info.aborted);
 
 		del_timer_sync(&wil->scan_timer);
 		mutex_lock(&wil->p2p_wdev_mutex);
-		cfg80211_scan_done(wil->scan_request, aborted);
+		cfg80211_scan_done(wil->scan_request, &info);
 		wil->radio_wdev = wil->wdev;
 		mutex_unlock(&wil->p2p_wdev_mutex);
 		wil->scan_request = NULL;

drivers/net/wireless/broadcom/brcm80211/brcmfmac/cfg80211.c

···
 		if (!aborted)
 			cfg80211_sched_scan_results(cfg_to_wiphy(cfg));
 	} else if (scan_request) {
+		struct cfg80211_scan_info info = {
+			.aborted = aborted,
+		};
+
 		brcmf_dbg(SCAN, "ESCAN Completed scan: %s\n",
 			  aborted ? "Aborted" : "Done");
-		cfg80211_scan_done(scan_request, aborted);
+		cfg80211_scan_done(scan_request, &info);
 	}
 	if (!test_and_clear_bit(BRCMF_SCAN_STATUS_BUSY, &cfg->scan_status))
 		brcmf_dbg(SCAN, "Scan complete, probably P2P scan\n");

drivers/net/wireless/intersil/orinoco/scan.c

···
 
  scan_abort:
 	if (priv->scan_request) {
-		cfg80211_scan_done(priv->scan_request, abort);
+		struct cfg80211_scan_info info = {
+			.aborted = abort,
+		};
+
+		cfg80211_scan_done(priv->scan_request, &info);
 		priv->scan_request = NULL;
 	}
 }
···
 void orinoco_scan_done(struct orinoco_private *priv, bool abort)
 {
 	if (priv->scan_request) {
-		cfg80211_scan_done(priv->scan_request, abort);
+		struct cfg80211_scan_info info = {
+			.aborted = abort,
+		};
+
+		cfg80211_scan_done(priv->scan_request, &info);
 		priv->scan_request = NULL;
 	}
 }

drivers/net/wireless/marvell/libertas/cfg.c

···
 {
 	WARN_ON(!priv->scan_req);
 
-	if (priv->internal_scan)
+	if (priv->internal_scan) {
 		kfree(priv->scan_req);
-	else
-		cfg80211_scan_done(priv->scan_req, false);
+	} else {
+		struct cfg80211_scan_info info = {
+			.aborted = false,
+		};
+
+		cfg80211_scan_done(priv->scan_req, &info);
+	}
 
 	priv->scan_req = NULL;
 }

drivers/net/wireless/marvell/mwifiex/cmdevt.c

···
 			if (!priv)
 				continue;
 			if (priv->scan_request) {
+				struct cfg80211_scan_info info = {
+					.aborted = true,
+				};
+
 				mwifiex_dbg(adapter, WARN, "info: aborting scan\n");
-				cfg80211_scan_done(priv->scan_request, 1);
+				cfg80211_scan_done(priv->scan_request, &info);
 				priv->scan_request = NULL;
 			}
 		}
···
 			if (!priv)
 				continue;
 			if (priv->scan_request) {
+				struct cfg80211_scan_info info = {
+					.aborted = true,
+				};
+
 				mwifiex_dbg(adapter, WARN, "info: aborting scan\n");
-				cfg80211_scan_done(priv->scan_request, 1);
+				cfg80211_scan_done(priv->scan_request, &info);
 				priv->scan_request = NULL;
 			}
 		}

drivers/net/wireless/marvell/mwifiex/main.c

···
 	struct mwifiex_private *priv = mwifiex_netdev_get_priv(dev);
 
 	if (priv->scan_request) {
+		struct cfg80211_scan_info info = {
+			.aborted = true,
+		};
+
 		mwifiex_dbg(priv->adapter, INFO,
 			    "aborting scan on ndo_stop\n");
-		cfg80211_scan_done(priv->scan_request, 1);
+		cfg80211_scan_done(priv->scan_request, &info);
 		priv->scan_request = NULL;
 		priv->scan_aborting = true;
 	}

drivers/net/wireless/marvell/mwifiex/scan.c

···
 			mwifiex_complete_scan(priv);
 
 		if (priv->scan_request) {
+			struct cfg80211_scan_info info = {
+				.aborted = false,
+			};
+
 			mwifiex_dbg(adapter, INFO,
 				    "info: notifying scan done\n");
-			cfg80211_scan_done(priv->scan_request, 0);
+			cfg80211_scan_done(priv->scan_request, &info);
 			priv->scan_request = NULL;
 		} else {
 			priv->scan_aborting = false;
···
 
 		if (!adapter->active_scan_triggered) {
 			if (priv->scan_request) {
+				struct cfg80211_scan_info info = {
+					.aborted = true,
+				};
+
 				mwifiex_dbg(adapter, INFO,
 					    "info: aborting scan\n");
-				cfg80211_scan_done(priv->scan_request, 1);
+				cfg80211_scan_done(priv->scan_request, &info);
 				priv->scan_request = NULL;
 			} else {
 				priv->scan_aborting = false;

drivers/net/wireless/rndis_wlan.c

···
 	struct rndis_wlan_private *priv =
 		container_of(work, struct rndis_wlan_private, scan_work.work);
 	struct usbnet *usbdev = priv->usbdev;
+	struct cfg80211_scan_info info = {};
 	int ret;
 
 	netdev_dbg(usbdev->net, "get_scan_results\n");
···
 
 	ret = rndis_check_bssid_list(usbdev, NULL, NULL);
 
-	cfg80211_scan_done(priv->scan_request, ret < 0);
+	info.aborted = ret < 0;
+	cfg80211_scan_done(priv->scan_request, &info);
 
 	priv->scan_request = NULL;
 }
···
 	flush_workqueue(priv->workqueue);
 
 	if (priv->scan_request) {
-		cfg80211_scan_done(priv->scan_request, true);
+		struct cfg80211_scan_info info = {
+			.aborted = true,
+		};
+
+		cfg80211_scan_done(priv->scan_request, &info);
 		priv->scan_request = NULL;
 	}
 

drivers/staging/rtl8723au/os_dep/ioctl_cfg80211.c

···
 		DBG_8723A("%s with scan req\n", __func__);
 
 		if (pwdev_priv->scan_request->wiphy !=
-		    pwdev_priv->rtw_wdev->wiphy)
+		    pwdev_priv->rtw_wdev->wiphy) {
 			DBG_8723A("error wiphy compare\n");
-		else
-			cfg80211_scan_done(pwdev_priv->scan_request, aborted);
+		} else {
+			struct cfg80211_scan_info info = {
+				.aborted = aborted,
+			};
+
+			cfg80211_scan_done(pwdev_priv->scan_request, &info);
+		}
 
 		pwdev_priv->scan_request = NULL;
 	} else {

drivers/staging/wilc1000/wilc_wfi_cfgoperations.c

···
 			mutex_lock(&priv->scan_req_lock);
 
 			if (priv->pstrScanReq) {
-				cfg80211_scan_done(priv->pstrScanReq, false);
+				struct cfg80211_scan_info info = {
+					.aborted = false,
+				};
+
+				cfg80211_scan_done(priv->pstrScanReq, &info);
 				priv->u32RcvdChCount = 0;
 				priv->bCfgScanning = false;
 				priv->pstrScanReq = NULL;
···
 			mutex_lock(&priv->scan_req_lock);
 
 			if (priv->pstrScanReq) {
+				struct cfg80211_scan_info info = {
+					.aborted = false,
+				};
+
 				update_scan_time();
 				refresh_scan(priv, 1, false);
 
-				cfg80211_scan_done(priv->pstrScanReq, false);
+				cfg80211_scan_done(priv->pstrScanReq, &info);
 				priv->bCfgScanning = false;
 				priv->pstrScanReq = NULL;
 			}

drivers/staging/wlan-ng/cfg80211.c

···
 	struct p80211msg_dot11req_scan msg1;
 	struct p80211msg_dot11req_scan_results msg2;
 	struct cfg80211_bss *bss;
+	struct cfg80211_scan_info info = {};
+
 	int result;
 	int err = 0;
 	int numbss = 0;
···
 		err = prism2_result2err(msg2.resultcode.data);
 
 exit:
-	cfg80211_scan_done(request, err ? 1 : 0);
+	info.aborted = !!(err);
+	cfg80211_scan_done(request, &info);
 	priv->scan_request = NULL;
 	return err;
 }

include/net/cfg80211.h

···
 };
 
 /**
+ * struct cfg80211_scan_info - information about completed scan
+ * @scan_start_tsf: scan start time in terms of the TSF of the BSS that the
+ *	wireless device that requested the scan is connected to. If this
+ *	information is not available, this field is left zero.
+ * @tsf_bssid: the BSSID according to which %scan_start_tsf is set.
+ * @aborted: set to true if the scan was aborted for any reason,
+ *	userspace will be notified of that
+ */
+struct cfg80211_scan_info {
+	u64 scan_start_tsf;
+	u8 tsf_bssid[ETH_ALEN] __aligned(2);
+	bool aborted;
+};
+
+/**
  * struct cfg80211_scan_request - scan request description
  *
  * @ssids: SSIDs to scan for (active scan only)
···
  * @scan_width: channel width for scanning
  * @ie: optional information element(s) to add into Probe Request or %NULL
  * @ie_len: length of ie in octets
+ * @duration: how long to listen on each channel, in TUs. If
+ *	%duration_mandatory is not set, this is the maximum dwell time and
+ *	the actual dwell time may be shorter.
+ * @duration_mandatory: if set, the scan duration must be as specified by the
+ *	%duration field.
  * @flags: bit field of flags controlling operation
  * @rates: bitmap of rates to advertise for each band
  * @wiphy: the wiphy this was for
  * @scan_start: time (in jiffies) when the scan started
  * @wdev: the wireless device to scan for
- * @aborted: (internal) scan request was notified as aborted
+ * @info: (internal) information about completed scan
  * @notified: (internal) scan request was notified as done or aborted
  * @no_cck: used to send probe requests at non CCK rate in 2GHz band
  * @mac_addr: MAC address used with randomisation
···
 	enum nl80211_bss_scan_width scan_width;
 	const u8 *ie;
 	size_t ie_len;
+	u16 duration;
+	bool duration_mandatory;
 	u32 flags;
 
 	u32 rates[NUM_NL80211_BANDS];
···
 	/* internal */
 	struct wiphy *wiphy;
 	unsigned long scan_start;
-	bool aborted, notified;
+	struct cfg80211_scan_info info;
+	bool notified;
 	bool no_cck;
 
 	/* keep last */
···
  *	buffered on the device) and be accurate to about 10ms.
  *	If the frame isn't buffered, just passing the return value of
  *	ktime_get_boot_ns() is likely appropriate.
+ * @parent_tsf: the time at the start of reception of the first octet of the
+ *	timestamp field of the frame. The time is the TSF of the BSS specified
+ *	by %parent_bssid.
+ * @parent_bssid: the BSS according to which %parent_tsf is set. This is set to
+ *	the BSS that requested the scan in which the beacon/probe was received.
  */
 struct cfg80211_inform_bss {
 	struct ieee80211_channel *chan;
 	enum nl80211_bss_scan_width scan_width;
 	s32 signal;
 	u64 boottime_ns;
+	u64 parent_tsf;
+	u8 parent_bssid[ETH_ALEN] __aligned(2);
 };
 
 /**
···
  * cfg80211_scan_done - notify that scan finished
  *
  * @request: the corresponding scan request
- * @aborted: set to true if the scan was aborted for any reason,
- *	userspace will be notified of that
+ * @info: information about the completed scan
  */
-void cfg80211_scan_done(struct cfg80211_scan_request *request, bool aborted);
+void cfg80211_scan_done(struct cfg80211_scan_request *request,
+			struct cfg80211_scan_info *info);
 
 /**
  * cfg80211_sched_scan_results - notify that new scan results are available

include/uapi/linux/nl80211.h

···
  *	to turn that feature off set an invalid mac address
  *	(e.g. FF:FF:FF:FF:FF:FF)
  *
+ * @NL80211_ATTR_SCAN_START_TIME_TSF: The time at which the scan was actually
+ *	started (u64). The time is the TSF of the BSS the interface that
+ *	requested the scan is connected to (if available, otherwise this
+ *	attribute must not be included).
+ * @NL80211_ATTR_SCAN_START_TIME_TSF_BSSID: The BSS according to which
+ *	%NL80211_ATTR_SCAN_START_TIME_TSF is set.
+ * @NL80211_ATTR_MEASUREMENT_DURATION: measurement duration in TUs (u16). If
+ *	%NL80211_ATTR_MEASUREMENT_DURATION_MANDATORY is not set, this is the
+ *	maximum measurement duration allowed. This attribute is used with
+ *	measurement requests. It can also be used with %NL80211_CMD_TRIGGER_SCAN
+ *	if the scan is used for beacon report radio measurement.
+ * @NL80211_ATTR_MEASUREMENT_DURATION_MANDATORY: flag attribute that indicates
+ *	that the duration specified with %NL80211_ATTR_MEASUREMENT_DURATION is
+ *	mandatory. If this flag is not set, the duration is the maximum duration
+ *	and the actual measurement duration may be shorter.
+ *
  * @NUM_NL80211_ATTR: total number of nl80211_attrs available
  * @NL80211_ATTR_MAX: highest attribute number currently defined
  * @__NL80211_ATTR_AFTER_LAST: internal use
···
 
 	NL80211_ATTR_MU_MIMO_GROUP_DATA,
 	NL80211_ATTR_MU_MIMO_FOLLOW_MAC_ADDR,
+
+	NL80211_ATTR_SCAN_START_TIME_TSF,
+	NL80211_ATTR_SCAN_START_TIME_TSF_BSSID,
+	NL80211_ATTR_MEASUREMENT_DURATION,
+	NL80211_ATTR_MEASUREMENT_DURATION_MANDATORY,
 
 	/* add attributes here, update the policy in nl80211.c */
 
···
  *	was last updated by a received frame. The value is expected to be
  *	accurate to about 10ms. (u64, nanoseconds)
  * @NL80211_BSS_PAD: attribute used for padding for 64-bit alignment
+ * @NL80211_BSS_PARENT_TSF: the time at the start of reception of the first
+ *	octet of the timestamp field of the last beacon/probe received for
+ *	this BSS. The time is the TSF of the BSS specified by
+ *	@NL80211_BSS_PARENT_BSSID. (u64).
+ * @NL80211_BSS_PARENT_BSSID: the BSS according to which @NL80211_BSS_PARENT_TSF
+ *	is set.
  * @__NL80211_BSS_AFTER_LAST: internal
  * @NL80211_BSS_MAX: highest BSS attribute
  */
···
 	NL80211_BSS_PRESP_DATA,
 	NL80211_BSS_LAST_SEEN_BOOTTIME,
 	NL80211_BSS_PAD,
+	NL80211_BSS_PARENT_TSF,
+	NL80211_BSS_PARENT_BSSID,
 
 	/* keep last */
 	__NL80211_BSS_AFTER_LAST,
···
  *	%NL80211_ATTR_MU_MIMO_GROUP_DATA attribute,
  *	or can be configured to follow a station by configuring the
  *	%NL80211_ATTR_MU_MIMO_FOLLOW_MAC_ADDR attribute.
+ * @NL80211_EXT_FEATURE_SCAN_START_TIME: This driver includes the actual
+ *	time the scan started in scan results event. The time is the TSF of
+ *	the BSS that the interface that requested the scan is connected to
+ *	(if available).
+ * @NL80211_EXT_FEATURE_BSS_PARENT_TSF: Per BSS, this driver reports the
+ *	time the last beacon/probe was received. The time is the TSF of the
+ *	BSS that the interface that requested the scan is connected to
+ *	(if available).
+ * @NL80211_EXT_FEATURE_SET_SCAN_DWELL: This driver supports configuration of
+ *	channel dwell time.
  *
  * @NUM_NL80211_EXT_FEATURES: number of extended features.
  * @MAX_NL80211_EXT_FEATURES: highest extended feature index.
···
 	NL80211_EXT_FEATURE_VHT_IBSS,
 	NL80211_EXT_FEATURE_RRM,
 	NL80211_EXT_FEATURE_MU_MIMO_AIR_SNIFFER,
+	NL80211_EXT_FEATURE_SCAN_START_TIME,
+	NL80211_EXT_FEATURE_BSS_PARENT_TSF,
+	NL80211_EXT_FEATURE_SET_SCAN_DWELL,
 
 	/* add new features before the definition below */
 	NUM_NL80211_EXT_FEATURES,

net/mac80211/scan.c

···
 	scan_req = rcu_dereference_protected(local->scan_req,
 					     lockdep_is_held(&local->mtx));
 
-	if (scan_req != local->int_scan_req)
-		cfg80211_scan_done(scan_req, aborted);
+	if (scan_req != local->int_scan_req) {
+		struct cfg80211_scan_info info = {
+			.aborted = aborted,
+		};
+
+		cfg80211_scan_done(scan_req, &info);
+	}
 	RCU_INIT_POINTER(local->scan_req, NULL);
 
 	scan_sdata = rcu_dereference_protected(local->scan_sdata,

net/wireless/core.c

···
 
 	if (rdev->scan_req && rdev->scan_req->wdev == wdev) {
 		if (WARN_ON(!rdev->scan_req->notified))
-			rdev->scan_req->aborted = true;
+			rdev->scan_req->info.aborted = true;
 		___cfg80211_scan_done(rdev, false);
 	}
 }
···
 		cfg80211_update_iface_num(rdev, wdev->iftype, -1);
 		if (rdev->scan_req && rdev->scan_req->wdev == wdev) {
 			if (WARN_ON(!rdev->scan_req->notified))
-				rdev->scan_req->aborted = true;
+				rdev->scan_req->info.aborted = true;
 			___cfg80211_scan_done(rdev, false);
 		}
 

net/wireless/core.h

···
 	unsigned long refcount;
 	atomic_t hold;
 
+	/* time at the start of the reception of the first octet of the
+	 * timestamp field of the last beacon/probe received for this BSS.
+	 * The time is the TSF of the BSS specified by %parent_bssid.
+	 */
+	u64 parent_tsf;
+
+	/* the BSS according to which %parent_tsf is set. This is set to
+	 * the BSS that the interface that requested the scan was connected to
+	 * when the beacon/probe was received.
+	 */
+	u8 parent_bssid[ETH_ALEN] __aligned(2);
+
 	/* must be last because of priv member */
 	struct cfg80211_bss pub;
 };

net/wireless/nl80211.c

···
 		}
 	}
 
+	if (info->attrs[NL80211_ATTR_MEASUREMENT_DURATION]) {
+		if (!wiphy_ext_feature_isset(wiphy,
+					NL80211_EXT_FEATURE_SET_SCAN_DWELL)) {
+			err = -EOPNOTSUPP;
+			goto out_free;
+		}
+
+		request->duration =
+			nla_get_u16(info->attrs[NL80211_ATTR_MEASUREMENT_DURATION]);
+		request->duration_mandatory =
+			nla_get_flag(info->attrs[NL80211_ATTR_MEASUREMENT_DURATION_MANDATORY]);
+	}
+
 	if (info->attrs[NL80211_ATTR_SCAN_FLAGS]) {
 		request->flags = nla_get_u32(
 			info->attrs[NL80211_ATTR_SCAN_FLAGS]);
···
 	    nla_put_u32(msg, NL80211_BSS_CHAN_WIDTH, res->scan_width) ||
 	    nla_put_u32(msg, NL80211_BSS_SEEN_MS_AGO,
 			jiffies_to_msecs(jiffies - intbss->ts)))
+		goto nla_put_failure;
+
+	if (intbss->parent_tsf &&
+	    (nla_put_u64_64bit(msg, NL80211_BSS_PARENT_TSF,
+			       intbss->parent_tsf, NL80211_BSS_PAD) ||
+	     nla_put(msg, NL80211_BSS_PARENT_BSSID, ETH_ALEN,
+		     intbss->parent_bssid)))
 		goto nla_put_failure;
 
 	if (intbss->ts_boottime &&
···
 
 	if (req->flags &&
 	    nla_put_u32(msg, NL80211_ATTR_SCAN_FLAGS, req->flags))
+		goto nla_put_failure;
+
+	if (req->info.scan_start_tsf &&
+	    (nla_put_u64_64bit(msg, NL80211_ATTR_SCAN_START_TIME_TSF,
+			       req->info.scan_start_tsf, NL80211_BSS_PAD) ||
+	     nla_put(msg, NL80211_ATTR_SCAN_START_TIME_TSF_BSSID, ETH_ALEN,
+		     req->info.tsf_bssid)))
 		goto nla_put_failure;
 
 	return 0;

net/wireless/scan.c

···
  *
  * Copyright 2008 Johannes Berg <[e-mail]>
  * Copyright 2013-2014  Intel Mobile Communications GmbH
+ * Copyright 2016	Intel Deutschland GmbH
  */
 #include <linux/kernel.h>
 #include <linux/slab.h>
···
 	if (wdev->netdev)
 		cfg80211_sme_scan_done(wdev->netdev);
 
-	if (!request->aborted &&
+	if (!request->info.aborted &&
 	    request->flags & NL80211_SCAN_FLAG_FLUSH) {
 		/* flush entries from previous scans */
 		spin_lock_bh(&rdev->bss_lock);
···
 		spin_unlock_bh(&rdev->bss_lock);
 	}
 
-	msg = nl80211_build_scan_msg(rdev, wdev, request->aborted);
+	msg = nl80211_build_scan_msg(rdev, wdev, request->info.aborted);
 
 #ifdef CONFIG_CFG80211_WEXT
-	if (wdev->netdev && !request->aborted) {
+	if (wdev->netdev && !request->info.aborted) {
 		memset(&wrqu, 0, sizeof(wrqu));
 
 		wireless_send_event(wdev->netdev, SIOCGIWSCAN, &wrqu, NULL);
···
 	rtnl_unlock();
 }
 
-void cfg80211_scan_done(struct cfg80211_scan_request *request, bool aborted)
+void cfg80211_scan_done(struct cfg80211_scan_request *request,
+			struct cfg80211_scan_info *info)
 {
-	trace_cfg80211_scan_done(request, aborted);
+	trace_cfg80211_scan_done(request, info);
 	WARN_ON(request != wiphy_to_rdev(request->wiphy)->scan_req);
 
-	request->aborted = aborted;
+	request->info = *info;
 	request->notified = true;
 	queue_work(cfg80211_wq, &wiphy_to_rdev(request->wiphy)->scan_done_wk);
 }
···
 		found->pub.capability = tmp->pub.capability;
 		found->ts = tmp->ts;
 		found->ts_boottime = tmp->ts_boottime;
+		found->parent_tsf = tmp->parent_tsf;
+		ether_addr_copy(found->parent_bssid, tmp->parent_bssid);
 	} else {
 		struct cfg80211_internal_bss *new;
 		struct cfg80211_internal_bss *hidden;
···
 	tmp.pub.beacon_interval = le16_to_cpu(mgmt->u.probe_resp.beacon_int);
 	tmp.pub.capability = le16_to_cpu(mgmt->u.probe_resp.capab_info);
 	tmp.ts_boottime = data->boottime_ns;
+	tmp.parent_tsf = data->parent_tsf;
+	ether_addr_copy(tmp.parent_bssid, data->parent_bssid);
 
 	signal_valid = abs(data->chan->center_freq - channel->center_freq) <=
 		wiphy->max_adj_channel_rssi_comp;

net/wireless/trace.h

···
 	);
 
 TRACE_EVENT(cfg80211_scan_done,
-	TP_PROTO(struct cfg80211_scan_request *request, bool aborted),
-	TP_ARGS(request, aborted),
+	TP_PROTO(struct cfg80211_scan_request *request,
+		 struct cfg80211_scan_info *info),
+	TP_ARGS(request, info),
 	TP_STRUCT__entry(
 		__field(u32, n_channels)
 		__dynamic_array(u8, ie, request ? request->ie_len : 0)
···
 		MAC_ENTRY(wiphy_mac)
 		__field(bool, no_cck)
 		__field(bool, aborted)
+		__field(u64, scan_start_tsf)
+		MAC_ENTRY(tsf_bssid)
 	),
 	TP_fast_assign(
 		if (request) {
···
 					   request->wiphy->perm_addr);
 			__entry->no_cck = request->no_cck;
 		}
-		__entry->aborted = aborted;
+		if (info) {
+			__entry->aborted = info->aborted;
+			__entry->scan_start_tsf = info->scan_start_tsf;
+			MAC_ASSIGN(tsf_bssid, info->tsf_bssid);
+		}
 	),
-	TP_printk("aborted: %s", BOOL_TO_STR(__entry->aborted))
+	TP_printk("aborted: %s, scan start (TSF): %llu, tsf_bssid: " MAC_PR_FMT,
+		  BOOL_TO_STR(__entry->aborted),
+		  (unsigned long long)__entry->scan_start_tsf,
+		  MAC_PR_ARG(tsf_bssid))
 );
 
 DEFINE_EVENT(wiphy_only_evt, cfg80211_sched_scan_results,
···
 		__dynamic_array(u8, mgmt, len)
 		__field(s32, signal)
 		__field(u64, ts_boottime)
+		__field(u64, parent_tsf)
+		MAC_ENTRY(parent_bssid)
 	),
 	TP_fast_assign(
 		WIPHY_ASSIGN;
···
 			memcpy(__get_dynamic_array(mgmt), mgmt, len);
 		__entry->signal = data->signal;
 		__entry->ts_boottime = data->boottime_ns;
+		__entry->parent_tsf = data->parent_tsf;
+		MAC_ASSIGN(parent_bssid, data->parent_bssid);
 	),
-	TP_printk(WIPHY_PR_FMT ", " CHAN_PR_FMT "(scan_width: %d) signal: %d, tsb:%llu",
-		  WIPHY_PR_ARG, CHAN_PR_ARG, __entry->scan_width,
-		  __entry->signal, (unsigned long long)__entry->ts_boottime)
+	TP_printk(WIPHY_PR_FMT ", " CHAN_PR_FMT
+		  "(scan_width: %d) signal: %d, tsb:%llu, detect_tsf:%llu, tsf_bssid: "
+		  MAC_PR_FMT, WIPHY_PR_ARG, CHAN_PR_ARG, __entry->scan_width,
+		  __entry->signal, (unsigned long long)__entry->ts_boottime,
+		  (unsigned long long)__entry->parent_tsf,
+		  MAC_PR_ARG(parent_bssid))
 );
 
 DECLARE_EVENT_CLASS(cfg80211_bss_evt,