From:   Luiz Augusto von Dentz <luiz.dentz@gmail.com>
To:     linux-bluetooth@vger.kernel.org
Subject: [PATCH v4 2/4] Bluetooth: hci_sync: Add check simultaneous roles support
Date:   Tue, 21 Dec 2021 14:33:55 -0800
Message-Id: <20211221223357.742863-2-luiz.dentz@gmail.com>
In-Reply-To: <20211221223357.742863-1-luiz.dentz@gmail.com>
References: <20211221223357.742863-1-luiz.dentz@gmail.com>
MIME-Version: 1.0
Content-Transfer-Encoding: 8bit
Precedence: bulk

From: Luiz Augusto von Dentz <luiz.von.dentz@intel.com>

This attempts to check if the controller can act as both central and
peripheral simultaneously and in case it does skip suspending
advertising or in case of directed advertising don't fail if scanning.

Signed-off-by: Luiz Augusto von Dentz <luiz.von.dentz@intel.com>
---
 include/net/bluetooth/hci_core.h |  6 ++++++
 net/bluetooth/hci_sync.c         | 24 ++++++++++++------------
 net/bluetooth/mgmt.c             |  5 +----
 3 files changed, 19 insertions(+), 16 deletions(-)

diff --git a/include/net/bluetooth/hci_core.h b/include/net/bluetooth/hci_core.h
index 1e479ba25c31..cc95b6c3f839 100644
--- a/include/net/bluetooth/hci_core.h
+++ b/include/net/bluetooth/hci_core.h
@@ -782,6 +782,12 @@ extern struct mutex hci_cb_list_lock;
 		hci_dev_clear_flag(hdev, HCI_QUALITY_REPORT);	\
 	} while (0)
 
+#define hci_dev_le_state_simultaneous(hdev) \
+	(test_bit(HCI_QUIRK_VALID_LE_STATES, &hdev->quirks) && \
+	 (hdev->le_states[4] & 0x08) &&	/* Central */ \
+	 (hdev->le_states[4] & 0x40) &&	/* Peripheral */ \
+	 (hdev->le_states[3] & 0x10))	/* Simultaneous */
+
 /* ----- HCI interface to upper protocols ----- */
 int l2cap_connect_ind(struct hci_dev *hdev, bdaddr_t *bdaddr);
 int l2cap_disconn_ind(struct hci_conn *hcon);
diff --git a/net/bluetooth/hci_sync.c b/net/bluetooth/hci_sync.c
index 28d62273d67c..6abcf966d001 100644
--- a/net/bluetooth/hci_sync.c
+++ b/net/bluetooth/hci_sync.c
@@ -5170,30 +5170,29 @@ int hci_le_create_conn_sync(struct hci_dev *hdev, struct hci_conn *conn)
 	u8 own_addr_type;
 	int err;
 
-	/* Disable advertising if we're active. For central role
-	 * connections most controllers will refuse to connect if
-	 * advertising is enabled, and for peripheral role connections we
-	 * anyway have to disable it in order to start directed
-	 * advertising. Any registered advertisements will be
-	 * re-enabled after the connection attempt is finished.
-	 */
-	hci_pause_advertising_sync(hdev);
-
 	/* If requested to connect as peripheral use directed advertising */
 	if (conn->role == HCI_ROLE_SLAVE) {
-		/* If we're active scanning most controllers are unable
-		 * to initiate advertising. Simply reject the attempt.
+		/* If we're active scanning and the controller doesn't support
+		 * simultaneous roles simply reject the attempt.
 		 */
 		if (hci_dev_test_flag(hdev, HCI_LE_SCAN) &&
-		    hdev->le_scan_type == LE_SCAN_ACTIVE) {
+		    hdev->le_scan_type == LE_SCAN_ACTIVE &&
+		    !hci_dev_le_state_simultaneous(hdev)) {
 			hci_conn_del(conn);
 			return -EBUSY;
 		}
 
+		/* Pause advertising while doing directed advertising. */
+		hci_pause_advertising_sync(hdev);
+
 		err = hci_le_directed_advertising_sync(hdev, conn);
 		goto done;
 	}
 
+	/* Disable advertising if simultaneous roles is not supported. */
+	if (!hci_dev_le_state_simultaneous(hdev))
+		hci_pause_advertising_sync(hdev);
+
 	params = hci_conn_params_lookup(hdev, &conn->dst, conn->dst_type);
 	if (params) {
 		conn->le_conn_min_interval = params->conn_min_interval;
@@ -5251,6 +5250,7 @@ int hci_le_create_conn_sync(struct hci_dev *hdev, struct hci_conn *conn)
 				       HCI_CMD_TIMEOUT, NULL);
 
 done:
+	/* Re-enable advertising after the connection attempt is finished. */
 	hci_resume_advertising_sync(hdev);
 	return err;
 }
diff --git a/net/bluetooth/mgmt.c b/net/bluetooth/mgmt.c
index 962bb747d2cd..3326d9459dd3 100644
--- a/net/bluetooth/mgmt.c
+++ b/net/bluetooth/mgmt.c
@@ -3916,10 +3916,7 @@ static int read_exp_features_info(struct sock *sk, struct hci_dev *hdev,
 #endif
 
 	if (hdev) {
-		if (test_bit(HCI_QUIRK_VALID_LE_STATES, &hdev->quirks) &&
-		    (hdev->le_states[4] & 0x08) &&	/* Central */
-		    (hdev->le_states[4] & 0x40) &&	/* Peripheral */
-		    (hdev->le_states[3] & 0x10))	/* Simultaneous */
+		if (hci_dev_le_state_simultaneous(hdev))
 			flags = BIT(0);
 		else
 			flags = 0;
-- 
2.33.1