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From:   Marcel Holtmann <marcel@holtmann.org>
To:     linux-bluetooth@vger.kernel.org
Subject: [PATCH v2 12/14] Bluetooth: Update background scan and report device based on advertisement monitors
Date:   Wed, 17 Jun 2020 16:39:18 +0200
Message-Id: <4c8aeca04ed20e2776cadd9bdb57a7a3632d622c.1592404644.git.marcel@holtmann.org>
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From: Miao-chen Chou <mcchou@chromium.org>

This calls hci_update_background_scan() when there is any update on the
advertisement monitors. If there is at least one advertisement monitor,
the filtering policy of scan parameters should be 0x00. This also reports
device found mgmt events if there is at least one monitor.

The following cases were tested with btmgmt advmon-* commands.
(1) add a ADV monitor and observe that the passive scanning is
triggered.
(2) remove the last ADV monitor and observe that the passive scanning is
terminated.
(3) with a LE peripheral paired, repeat (1) and observe the passive
scanning continues.
(4) with a LE peripheral paired, repeat (2) and observe the passive
scanning continues.
(5) with a ADV monitor, suspend/resume the host and observe the passive
scanning continues.

Signed-off-by: Miao-chen Chou <mcchou@chromium.org>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
---
 include/net/bluetooth/hci_core.h |  1 +
 net/bluetooth/hci_core.c         | 13 +++++++++++++
 net/bluetooth/hci_event.c        |  5 +++--
 net/bluetooth/hci_request.c      | 17 ++++++++++++++---
 net/bluetooth/mgmt.c             |  5 ++++-
 5 files changed, 35 insertions(+), 6 deletions(-)

diff --git a/include/net/bluetooth/hci_core.h b/include/net/bluetooth/hci_core.h
index c54f9295892e..524057598ffd 100644
--- a/include/net/bluetooth/hci_core.h
+++ b/include/net/bluetooth/hci_core.h
@@ -1284,6 +1284,7 @@ void hci_adv_monitors_clear(struct hci_dev *hdev);
 void hci_free_adv_monitor(struct adv_monitor *monitor);
 int hci_add_adv_monitor(struct hci_dev *hdev, struct adv_monitor *monitor);
 int hci_remove_adv_monitor(struct hci_dev *hdev, u16 handle);
+bool hci_is_adv_monitoring(struct hci_dev *hdev);
 
 void hci_event_packet(struct hci_dev *hdev, struct sk_buff *skb);
 
diff --git a/net/bluetooth/hci_core.c b/net/bluetooth/hci_core.c
index 59132b3e2cde..7959b851cc63 100644
--- a/net/bluetooth/hci_core.c
+++ b/net/bluetooth/hci_core.c
@@ -3005,6 +3005,8 @@ void hci_adv_monitors_clear(struct hci_dev *hdev)
 		hci_free_adv_monitor(monitor);
 
 	idr_destroy(&hdev->adv_monitors_idr);
+
+	hci_update_background_scan(hdev);
 }
 
 void hci_free_adv_monitor(struct adv_monitor *monitor)
@@ -3038,6 +3040,9 @@ int hci_add_adv_monitor(struct hci_dev *hdev, struct adv_monitor *monitor)
 
 	hdev->adv_monitors_cnt++;
 	monitor->handle = handle;
+
+	hci_update_background_scan(hdev);
+
 	return 0;
 }
 
@@ -3069,9 +3074,17 @@ int hci_remove_adv_monitor(struct hci_dev *hdev, u16 handle)
 		idr_for_each(&hdev->adv_monitors_idr, &free_adv_monitor, hdev);
 	}
 
+	hci_update_background_scan(hdev);
+
 	return 0;
 }
 
+/* This function requires the caller holds hdev->lock */
+bool hci_is_adv_monitoring(struct hci_dev *hdev)
+{
+	return !idr_is_empty(&hdev->adv_monitors_idr);
+}
+
 struct bdaddr_list *hci_bdaddr_list_lookup(struct list_head *bdaddr_list,
 					 bdaddr_t *bdaddr, u8 type)
 {
diff --git a/net/bluetooth/hci_event.c b/net/bluetooth/hci_event.c
index 8981954ff4c4..e08d4dd9a24e 100644
--- a/net/bluetooth/hci_event.c
+++ b/net/bluetooth/hci_event.c
@@ -5447,14 +5447,15 @@ static void process_adv_report(struct hci_dev *hdev, u8 type, bdaddr_t *bdaddr,
 
 	/* Passive scanning shouldn't trigger any device found events,
 	 * except for devices marked as CONN_REPORT for which we do send
-	 * device found events.
+	 * device found events, or advertisement monitoring requested.
 	 */
 	if (hdev->le_scan_type == LE_SCAN_PASSIVE) {
 		if (type == LE_ADV_DIRECT_IND)
 			return;
 
 		if (!hci_pend_le_action_lookup(&hdev->pend_le_reports,
-					       bdaddr, bdaddr_type))
+					       bdaddr, bdaddr_type) &&
+		    idr_is_empty(&hdev->adv_monitors_idr))
 			return;
 
 		if (type == LE_ADV_NONCONN_IND || type == LE_ADV_SCAN_IND)
diff --git a/net/bluetooth/hci_request.c b/net/bluetooth/hci_request.c
index eee9c007a5fb..29decd7e8051 100644
--- a/net/bluetooth/hci_request.c
+++ b/net/bluetooth/hci_request.c
@@ -413,11 +413,15 @@ static void __hci_update_background_scan(struct hci_request *req)
 	 */
 	hci_discovery_filter_clear(hdev);
 
+	BT_DBG("%s ADV monitoring is %s", hdev->name,
+	       hci_is_adv_monitoring(hdev) ? "on" : "off");
+
 	if (list_empty(&hdev->pend_le_conns) &&
-	    list_empty(&hdev->pend_le_reports)) {
+	    list_empty(&hdev->pend_le_reports) &&
+	    !hci_is_adv_monitoring(hdev)) {
 		/* If there is no pending LE connections or devices
-		 * to be scanned for, we should stop the background
-		 * scanning.
+		 * to be scanned for or no ADV monitors, we should stop the
+		 * background scanning.
 		 */
 
 		/* If controller is not scanning we are done. */
@@ -794,6 +798,13 @@ static u8 update_white_list(struct hci_request *req)
 			return 0x00;
 	}
 
+	/* Once the controller offloading of advertisement monitor is in place,
+	 * the if condition should include the support of MSFT extension
+	 * support.
+	 */
+	if (!idr_is_empty(&hdev->adv_monitors_idr))
+		return 0x00;
+
 	/* Select filter policy to use white list */
 	return 0x01;
 }
diff --git a/net/bluetooth/mgmt.c b/net/bluetooth/mgmt.c
index b194da4de2d7..ec66160a673c 100644
--- a/net/bluetooth/mgmt.c
+++ b/net/bluetooth/mgmt.c
@@ -8575,8 +8575,11 @@ void mgmt_device_found(struct hci_dev *hdev, bdaddr_t *bdaddr, u8 link_type,
 	if (!hci_discovery_active(hdev)) {
 		if (link_type == ACL_LINK)
 			return;
-		if (link_type == LE_LINK && list_empty(&hdev->pend_le_reports))
+		if (link_type == LE_LINK &&
+		    list_empty(&hdev->pend_le_reports) &&
+		    !hci_is_adv_monitoring(hdev)) {
 			return;
+		}
 	}
 
 	if (hdev->discovery.result_filtering) {
-- 
2.26.2