Bluetooth: Add bt_buf_get_rx() helper API

The separate ACL & event pools will soon be removed, and it's already
now convenient to have a generic API when the exact type of the
incoming packet is not yet known.

Change-Id: I84cb65d17ea69ebeaeb21532fbf76689e4fb59a0
Signed-off-by: Johan Hedberg <johan.hedberg@intel.com>

include/bluetooth/buf.h

@@ -52,6 +52,17 @@ enum bt_buf_type {
 			sizeof(struct bt_hci_acl_hdr) + \
 			CONFIG_BLUETOOTH_RX_BUF_LEN)
 
+/** Allocate a buffer for incoming data
+ *
+ *  This will not set the buffer type so bt_buf_set_type() needs to be called
+ *  before bt_recv().
+ *
+ *  @param timeout Timeout in milliseconds, or one of the special values
+ *                 K_NO_WAIT and K_FOREVER.
+ *  @return A new buffer.
+ */
+struct net_buf *bt_buf_get_rx(int32_t timeout);
+
 /** Allocate a buffer for an HCI event
  *
  *  This will set the BT_BUF_EVT buffer type so bt_buf_set_type()

subsys/bluetooth/host/hci_core.c

@@ -4018,6 +4018,18 @@ struct net_buf *bt_buf_get_acl(int32_t timeout)
 #endif /* CONFIG_BLUETOOTH_CONN */
 }
 
+struct net_buf *bt_buf_get_rx(int32_t timeout)
+{
+	struct net_buf *buf;
+
+	buf = net_buf_alloc(&hci_rx_pool, timeout);
+	if (buf) {
+		net_buf_reserve(buf, CONFIG_BLUETOOTH_HCI_RECV_RESERVE);
+	}
+
+	return buf;
+}
+
 #if defined(CONFIG_BLUETOOTH_BREDR)
 static int br_start_inquiry(const struct bt_br_discovery_param *param)
 {

subsys/bluetooth/host/hci_raw.c

@@ -59,6 +59,11 @@ void bt_hci_driver_unregister(struct bt_hci_driver *drv)
 	bt_dev.drv = NULL;
 }
 
+struct net_buf *bt_buf_get_rx(int timeout)
+{
+	return net_buf_alloc(&hci_rx_pool, timeout);
+}
+
 struct net_buf *bt_buf_get_evt(uint8_t opcode, int timeout)
 {
 	struct net_buf *buf;