Bluetooth: Add MGMT Load Connection Subrate command

Add MGMT_OP_LOAD_CONN_SUBRATE (0x005C) command to load per-device
connection subrate parameters when the SCI feature is supported.

Add MGMT_EV_CONN_SUBRATE (0x0033) event to notify userspace when
connection rate changes occur via the LE Connection Rate Change HCI
event.

Add subrate fields (subrate_min, subrate_max, max_latency, cont_num)
to struct hci_conn_params to store the loaded subrate parameters, and
the corresponding le_rate_* fields to struct hci_conn to track the
parameters currently in use.

When a single entry is loaded for an already-connected central, or on
connection completion, the LE Connection Rate Request procedure is
initiated to apply the parameters.

Signed-off-by: Luiz Augusto von Dentz <luiz.von.dentz@intel.com>

3 files changed, 39 insertions, 0 deletions

diff --git a/include/net/bluetooth/hci_core.h b/include/net/bluetooth/hci_core.h
index b1f531b3b6ab..01b938c4b24a 100644
--- a/include/net/bluetooth/hci_core.h
+++ b/include/net/bluetooth/hci_core.h
@@ -818,6 +818,14 @@ struct hci_conn_params {
 	u16 conn_latency;
 	u16 supervision_timeout;
 
+	u16 rate_min_interval;
+	u16 rate_max_interval;
+	u16 subrate_min;
+	u16 subrate_max;
+	u16 max_latency;
+	u16 cont_num;
+	u16 rate_supv_timeout;
+
 	enum {
 		HCI_AUTO_CONN_DISABLED,
 		HCI_AUTO_CONN_REPORT,
@@ -2505,6 +2513,8 @@ void mgmt_advertising_removed(struct sock *sk, struct hci_dev *hdev,
 int mgmt_phy_configuration_changed(struct hci_dev *hdev, struct sock *skip);
 void mgmt_adv_monitor_device_lost(struct hci_dev *hdev, u16 handle,
 				  bdaddr_t *bdaddr, u8 addr_type);
+void mgmt_conn_subrate_notify(struct hci_dev *hdev, struct hci_conn *conn,
+			      u8 status);
 
 int hci_abort_conn(struct hci_conn *conn, u8 reason);
 void hci_le_conn_update(struct hci_conn *conn, u16 min, u16 max, u16 latency,
diff --git a/include/net/bluetooth/hci_sync.h b/include/net/bluetooth/hci_sync.h
index 0756d6fe77d4..a6579a868678 100644
--- a/include/net/bluetooth/hci_sync.h
+++ b/include/net/bluetooth/hci_sync.h
@@ -183,6 +183,7 @@ int hci_connect_le_sync(struct hci_dev *hdev, struct hci_conn *conn);
 int hci_cancel_connect_sync(struct hci_dev *hdev, struct hci_conn *conn);
 int hci_le_conn_update_sync(struct hci_dev *hdev, struct hci_conn *conn,
 			    struct hci_conn_params *params);
+int hci_le_conn_rate_request(struct hci_dev *hdev, struct hci_conn *conn);
 
 int hci_connect_pa_sync(struct hci_dev *hdev, struct hci_conn *conn);
 int hci_connect_big_sync(struct hci_dev *hdev, struct hci_conn *conn);
diff --git a/include/net/bluetooth/mgmt.h b/include/net/bluetooth/mgmt.h
index b285441db55b..1e22eab1081c 100644
--- a/include/net/bluetooth/mgmt.h
+++ b/include/net/bluetooth/mgmt.h
@@ -894,6 +894,23 @@ struct mgmt_cp_hci_cmd_sync {
 } __packed;
 #define MGMT_HCI_CMD_SYNC_SIZE		6
 
+#define MGMT_OP_LOAD_CONN_SUBRATE	0x005C
+struct mgmt_conn_subrate {
+	struct mgmt_addr_info addr;
+	__le16 min_interval;
+	__le16 max_interval;
+	__le16 subrate_min;
+	__le16 subrate_max;
+	__le16 max_latency;
+	__le16 cont_num;
+	__le16 supv_timeout;
+} __packed;
+struct mgmt_cp_load_conn_subrate {
+	__le16 param_count;
+	struct mgmt_conn_subrate params[] __counted_by_le(param_count);
+} __packed;
+#define MGMT_LOAD_CONN_SUBRATE_SIZE	2
+
 #define MGMT_EV_CMD_COMPLETE		0x0001
 struct mgmt_ev_cmd_complete {
 	__le16	opcode;
@@ -1193,3 +1210,14 @@ struct mgmt_ev_mesh_device_found {
 struct mgmt_ev_mesh_pkt_cmplt {
 	__u8	handle;
 } __packed;
+
+#define MGMT_EV_CONN_SUBRATE			0x0033
+struct mgmt_ev_conn_subrate {
+	struct mgmt_addr_info addr;
+	__u8	status;
+	__le16	interval;
+	__le16	subrate;
+	__le16	latency;
+	__le16	cont_num;
+	__le16	supv_timeout;
+} __packed;