linux-kernel - [PATCH v6 6/7] Bluetooth: advmon offload MSFT interleave scanning integration

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Message-Id: <20210122163457.v6.6.If655289cea81baf9226583a39f703ddc53817a51@changeid>
Date:   Fri, 22 Jan 2021 16:36:16 +0800
From:   Archie Pusaka <apusaka@...gle.com>
To:     linux-bluetooth <linux-bluetooth@...r.kernel.org>,
        Marcel Holtmann <marcel@...tmann.org>
Cc:     CrosBT Upstreaming <chromeos-bluetooth-upstreaming@...omium.org>,
        Archie Pusaka <apusaka@...omium.org>,
        Miao-chen Chou <mcchou@...omium.org>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Johan Hedberg <johan.hedberg@...il.com>,
        Luiz Augusto von Dentz <luiz.dentz@...il.com>,
        linux-kernel@...r.kernel.org, netdev@...r.kernel.org
Subject: [PATCH v6 6/7] Bluetooth: advmon offload MSFT interleave scanning integration

From: Archie Pusaka <apusaka@...omium.org>

When MSFT extension is supported, we don't have to interleave the scan
as we could just do allowlist scan.

Signed-off-by: Archie Pusaka <apusaka@...omium.org>
Reviewed-by: Miao-chen Chou <mcchou@...omium.org>

---

Changes in v6:
* New patch "advmon offload MSFT interleave scanning integration"

 net/bluetooth/hci_request.c | 20 +++++++++++---------
 1 file changed, 11 insertions(+), 9 deletions(-)

diff --git a/net/bluetooth/hci_request.c b/net/bluetooth/hci_request.c
index 5aa7bd5030a2..d29a44d77b4e 100644
--- a/net/bluetooth/hci_request.c
+++ b/net/bluetooth/hci_request.c
@@ -404,13 +404,18 @@ static void cancel_interleave_scan(struct hci_dev *hdev)
  */
 static bool __hci_update_interleaved_scan(struct hci_dev *hdev)
 {
-	/* If there is at least one ADV monitors and one pending LE connection
-	 * or one device to be scanned for, we should alternate between
-	 * allowlist scan and one without any filters to save power.
+	/* Do interleaved scan only if all of the following are true:
+	 * - There is at least one ADV monitor
+	 * - At least one pending LE connection or one device to be scanned for
+	 * - Monitor offloading is not supported
+	 * If so, we should alternate between allowlist scan and one without
+	 * any filters to save power.
 	 */
 	bool use_interleaving = hci_is_adv_monitoring(hdev) &&
 				!(list_empty(&hdev->pend_le_conns) &&
-				  list_empty(&hdev->pend_le_reports));
+				  list_empty(&hdev->pend_le_reports)) &&
+				hci_get_adv_monitor_offload_ext(hdev) ==
+				    HCI_ADV_MONITOR_EXT_NONE;
 	bool is_interleaving = is_interleave_scanning(hdev);
 
 	if (use_interleaving && !is_interleaving) {
@@ -899,14 +904,11 @@ static u8 update_white_list(struct hci_request *req)
 
 	/* Use the allowlist unless the following conditions are all true:
 	 * - We are not currently suspending
-	 * - There are 1 or more ADV monitors registered
+	 * - There are 1 or more ADV monitors registered and it's not offloaded
 	 * - Interleaved scanning is not currently using the allowlist
-	 *
-	 * Once the controller offloading of advertisement monitor is in place,
-	 * the above condition should include the support of MSFT extension
-	 * support.
 	 */
 	if (!idr_is_empty(&hdev->adv_monitors_idr) && !hdev->suspended &&
+	    hci_get_adv_monitor_offload_ext(hdev) == HCI_ADV_MONITOR_EXT_NONE &&
 	    hdev->interleave_scan_state != INTERLEAVE_SCAN_ALLOWLIST)
 		return 0x00;
 
-- 
2.30.0.280.ga3ce27912f-goog