Bluetooth: Store default and maximum LE data length settings

When the controller supports the LE Data Length Extension feature, the
default and maximum data length are read and now stored.

For backwards compatibility all values are initialized to the data
length values from Bluetooth 4.1 and earlier specifications.

Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
Signed-off-by: Johan Hedberg <johan.hedberg@intel.com>

2 files changed, 67 insertions, 0 deletions

diff --git a/net/bluetooth/hci_core.c b/net/bluetooth/hci_core.c
index 01e35ef6d201..47f0311d1006 100644
--- a/net/bluetooth/hci_core.c
+++ b/net/bluetooth/hci_core.c
@@ -2896,6 +2896,12 @@ struct hci_dev *hci_alloc_dev(void)
         hdev->le_conn_max_interval = 0x0038;
         hdev->le_conn_latency = 0x0000;
         hdev->le_supv_timeout = 0x002a;
+        hdev->le_def_tx_len = 0x001b;
+        hdev->le_def_tx_time = 0x0148;
+        hdev->le_max_tx_len = 0x001b;
+        hdev->le_max_tx_time = 0x0148;
+        hdev->le_max_rx_len = 0x001b;
+        hdev->le_max_rx_time = 0x0148;
 
         hdev->rpa_timeout = HCI_DEFAULT_RPA_TIMEOUT;
         hdev->discov_interleaved_timeout = DISCOV_INTERLEAVED_TIMEOUT;
diff --git a/net/bluetooth/hci_event.c b/net/bluetooth/hci_event.c
index a412eb1e1f61..a3055e90a5bb 100644
--- a/net/bluetooth/hci_event.c
+++ b/net/bluetooth/hci_event.c
@@ -1280,6 +1280,55 @@ static void hci_cc_le_read_supported_states(struct hci_dev *hdev,
         memcpy(hdev->le_states, rp->le_states, 8);
 }
 
+static void hci_cc_le_read_def_data_len(struct hci_dev *hdev,
+                                        struct sk_buff *skb)
+{
+        struct hci_rp_le_read_def_data_len *rp = (void *) skb->data;
+
+        BT_DBG("%s status 0x%2.2x", hdev->name, rp->status);
+
+        if (rp->status)
+                return;
+
+        hdev->le_def_tx_len = le16_to_cpu(rp->tx_len);
+        hdev->le_def_tx_time = le16_to_cpu(rp->tx_time);
+}
+
+static void hci_cc_le_write_def_data_len(struct hci_dev *hdev,
+                                         struct sk_buff *skb)
+{
+        struct hci_cp_le_write_def_data_len *sent;
+        __u8 status = *((__u8 *) skb->data);
+
+        BT_DBG("%s status 0x%2.2x", hdev->name, status);
+
+        if (status)
+                return;
+
+        sent = hci_sent_cmd_data(hdev, HCI_OP_LE_WRITE_DEF_DATA_LEN);
+        if (!sent)
+                return;
+
+        hdev->le_def_tx_len = le16_to_cpu(sent->tx_len);
+        hdev->le_def_tx_time = le16_to_cpu(sent->tx_time);
+}
+
+static void hci_cc_le_read_max_data_len(struct hci_dev *hdev,
+                                        struct sk_buff *skb)
+{
+        struct hci_rp_le_read_max_data_len *rp = (void *) skb->data;
+
+        BT_DBG("%s status 0x%2.2x", hdev->name, rp->status);
+
+        if (rp->status)
+                return;
+
+        hdev->le_max_tx_len = le16_to_cpu(rp->tx_len);
+        hdev->le_max_tx_time = le16_to_cpu(rp->tx_time);
+        hdev->le_max_rx_len = le16_to_cpu(rp->rx_len);
+        hdev->le_max_rx_time = le16_to_cpu(rp->rx_time);
+}
+
 static void hci_cc_write_le_host_supported(struct hci_dev *hdev,
                                            struct sk_buff *skb)
 {
@@ -2847,6 +2896,18 @@ static void hci_cmd_complete_evt(struct hci_dev *hdev, struct sk_buff *skb)
                 hci_cc_le_read_supported_states(hdev, skb);
                 break;
 
+        case HCI_OP_LE_READ_DEF_DATA_LEN:
+                hci_cc_le_read_def_data_len(hdev, skb);
+                break;
+
+        case HCI_OP_LE_WRITE_DEF_DATA_LEN:
+                hci_cc_le_write_def_data_len(hdev, skb);
+                break;
+
+        case HCI_OP_LE_READ_MAX_DATA_LEN:
+                hci_cc_le_read_max_data_len(hdev, skb);
+                break;
+
         case HCI_OP_WRITE_LE_HOST_SUPPORTED:
                 hci_cc_write_le_host_supported(hdev, skb);
                 break;