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Date:   Mon, 21 Sep 2020 12:23:08 +0800
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Subject: [PATCH v4 4/4] Bluetooth: Add toggle to switch off interleave scan
From:   Howard Chung <howardchung@google.com>
To:     linux-bluetooth@vger.kernel.org, marcel@holtmann.org,
        luiz.dentz@gmail.com
Cc:     alainm@chromium.org, mcchou@chromium.org, mmandlik@chromium.orgi,
        Howard Chung <howardchung@google.com>,
        "David S. Miller" <davem@davemloft.net>,
        Jakub Kicinski <kuba@kernel.org>,
        Johan Hedberg <johan.hedberg@gmail.com>,
        linux-kernel@vger.kernel.org, netdev@vger.kernel.org
Content-Type: text/plain; charset="UTF-8"
Precedence: bulk

This patch add a configurable parameter to switch off the interleave
scan feature.

Signed-off-by: Howard Chung <howardchung@google.com>
Reviewed-by: Alain Michaud <alainm@chromium.org>
---
Changes in v4:
- Set EnableAdvMonInterleaveScan default to Disable
- Fix 80 chars limit in mgmt_config.c

 include/net/bluetooth/hci_core.h | 1 +
 net/bluetooth/hci_core.c         | 1 +
 net/bluetooth/hci_request.c      | 3 ++-
 net/bluetooth/mgmt_config.c      | 5 +++++
 4 files changed, 9 insertions(+), 1 deletion(-)

diff --git a/include/net/bluetooth/hci_core.h b/include/net/bluetooth/hci_core.h
index 179350f869fdb..c3253f1cac0c2 100644
--- a/include/net/bluetooth/hci_core.h
+++ b/include/net/bluetooth/hci_core.h
@@ -363,6 +363,7 @@ struct hci_dev {
 	__u32		clock;
 	__u16		advmon_allowlist_duration;
 	__u16		advmon_no_filter_duration;
+	__u16		enable_advmon_interleave_scan;
 
 	__u16		devid_source;
 	__u16		devid_vendor;
diff --git a/net/bluetooth/hci_core.c b/net/bluetooth/hci_core.c
index 6c8850149265a..d5769ae682893 100644
--- a/net/bluetooth/hci_core.c
+++ b/net/bluetooth/hci_core.c
@@ -3595,6 +3595,7 @@ struct hci_dev *hci_alloc_dev(void)
 	/* The default values will be chosen in the future */
 	hdev->advmon_allowlist_duration = 300;
 	hdev->advmon_no_filter_duration = 500;
+	hdev->enable_advmon_interleave_scan = 0x0000;	/* Default to disable */
 
 	hdev->sniff_max_interval = 800;
 	hdev->sniff_min_interval = 80;
diff --git a/net/bluetooth/hci_request.c b/net/bluetooth/hci_request.c
index 1fcf6736811e4..bb38e1dead68f 100644
--- a/net/bluetooth/hci_request.c
+++ b/net/bluetooth/hci_request.c
@@ -500,7 +500,8 @@ static void __hci_update_background_scan(struct hci_request *req)
 		if (hci_dev_test_flag(hdev, HCI_LE_SCAN))
 			hci_req_add_le_scan_disable(req, false);
 
-		if (!update_adv_monitor_scan_state(hdev)) {
+		if (!hdev->enable_advmon_interleave_scan ||
+		    !update_adv_monitor_scan_state(hdev)) {
 			hci_req_add_le_passive_scan(req);
 			bt_dev_dbg(hdev, "%s starting background scanning",
 				   hdev->name);
diff --git a/net/bluetooth/mgmt_config.c b/net/bluetooth/mgmt_config.c
index 2d3ad288c78ac..34585ab4680b5 100644
--- a/net/bluetooth/mgmt_config.c
+++ b/net/bluetooth/mgmt_config.c
@@ -69,6 +69,7 @@ int read_def_system_config(struct sock *sk, struct hci_dev *hdev, void *data,
 						def_le_autoconnect_timeout),
 		HDEV_PARAM_U16(0x001d, advmon_allowlist_duration),
 		HDEV_PARAM_U16(0x001e, advmon_no_filter_duration),
+		HDEV_PARAM_U16(0x001f, enable_advmon_interleave_scan),
 	};
 	struct mgmt_rp_read_def_system_config *rp = (void *)params;
 
@@ -142,6 +143,7 @@ int set_def_system_config(struct sock *sk, struct hci_dev *hdev, void *data,
 		case 0x001b:
 		case 0x001d:
 		case 0x001e:
+		case 0x001f:
 			if (len != sizeof(u16)) {
 				bt_dev_warn(hdev, "invalid length %d, exp %zu for type %d",
 					    len, sizeof(u16), type);
@@ -261,6 +263,9 @@ int set_def_system_config(struct sock *sk, struct hci_dev *hdev, void *data,
 		case 0x0001e:
 			hdev->advmon_no_filter_duration = TLV_GET_LE16(buffer);
 			break;
+		case 0x0001f:
+			hdev->enable_advmon_interleave_scan = TLV_GET_LE16(buffer);
+			break;
 		default:
 			bt_dev_warn(hdev, "unsupported parameter %u", type);
 			break;
-- 
2.28.0.681.g6f77f65b4e-goog