Bluetooth: Implemented HCI frame reassembly for RX from stream

Implemented frame reassembly implementation for reassembling fragments
received from stream.

Signed-off-by: Suraj Sumangala <suraj@atheros.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>

2 files changed, 36 insertions, 0 deletions

diff --git a/include/net/bluetooth/hci_core.h b/include/net/bluetooth/hci_core.h
index 28e5eeefdec8..350b3e6964bd 100644
--- a/include/net/bluetooth/hci_core.h
+++ b/include/net/bluetooth/hci_core.h
@@ -437,6 +437,7 @@ void hci_event_packet(struct hci_dev *hdev, struct sk_buff *skb);
 
 int hci_recv_frame(struct sk_buff *skb);
 int hci_recv_fragment(struct hci_dev *hdev, int type, void *data, int count);
+int hci_recv_stream_fragment(struct hci_dev *hdev, void *data, int count);
 
 int hci_register_sysfs(struct hci_dev *hdev);
 void hci_unregister_sysfs(struct hci_dev *hdev);
diff --git a/net/bluetooth/hci_core.c b/net/bluetooth/hci_core.c
index 451e266840ad..995c9f9b84d0 100644
--- a/net/bluetooth/hci_core.c
+++ b/net/bluetooth/hci_core.c
@@ -1163,6 +1163,41 @@ int hci_recv_fragment(struct hci_dev *hdev, int type, void *data, int count)
 }
 EXPORT_SYMBOL(hci_recv_fragment);
 
+#define STREAM_REASSEMBLY 0
+
+int hci_recv_stream_fragment(struct hci_dev *hdev, void *data, int count)
+{
+        int type;
+        int rem = 0;
+
+        do {
+                struct sk_buff *skb = hdev->reassembly[STREAM_REASSEMBLY];
+
+                if (!skb) {
+                        struct { char type; } *pkt;
+
+                        /* Start of the frame */
+                        pkt = data;
+                        type = pkt->type;
+
+                        data++;
+                        count--;
+                } else
+                        type = bt_cb(skb)->pkt_type;
+
+                rem = hci_reassembly(hdev, type, data,
+                                        count, STREAM_REASSEMBLY, GFP_ATOMIC);
+                if (rem < 0)
+                        return rem;
+
+                data += (count - rem);
+                count = rem;
+        } while (count);
+
+        return rem;
+}
+EXPORT_SYMBOL(hci_recv_stream_fragment);
+
 /* ---- Interface to upper protocols ---- */
 
 /* Register/Unregister protocols.