[PATCH v3 3/3] Implemented HCI frame reassembly for Rx from stream

[suraj <suraj@xxxxxxxxxxx>]

Implemented frame reassembly implementation for reassembling fragments received from stream.

Signed-off-by: Suraj Sumangala <suraj@xxxxxxxxxxx>
---
 include/net/bluetooth/hci_core.h |    2 +
 net/bluetooth/hci_core.c         |   43 ++++++++++++++++++++++++++++++++++++++
 2 files changed, 45 insertions(+), 0 deletions(-)

diff --git a/include/net/bluetooth/hci_core.h b/include/net/bluetooth/hci_core.h
index e42f6ed..cd89d66 100644
--- a/include/net/bluetooth/hci_core.h
+++ b/include/net/bluetooth/hci_core.h
@@ -119,6 +119,7 @@ struct hci_dev {
 
 	struct sk_buff		*sent_cmd;
 	struct sk_buff		*reassembly[3];
+	struct sk_buff		*stream_reassembly;
 
 	struct mutex		req_lock;
 	wait_queue_head_t	req_wait_q;
@@ -428,6 +429,7 @@ 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 48ef56e..13bb2b9 100644
--- a/net/bluetooth/hci_core.c
+++ b/net/bluetooth/hci_core.c
@@ -916,6 +916,8 @@ int hci_register_dev(struct hci_dev *hdev)
 	for (i = 0; i < 3; i++)
 		hdev->reassembly[i] = NULL;
 
+	hdev->stream_reassembly = NULL;
+
 	init_waitqueue_head(&hdev->req_wait_q);
 	mutex_init(&hdev->req_lock);
 
@@ -973,6 +975,8 @@ int hci_unregister_dev(struct hci_dev *hdev)
 	for (i = 0; i < 3; i++)
 		kfree_skb(hdev->reassembly[i]);
 
+	kfree_skb(hdev->stream_reassembly);
+
 	hci_notify(hdev, HCI_DEV_UNREG);
 
 	if (hdev->rfkill) {
@@ -1145,6 +1149,45 @@ static int hci_reassembly(struct hci_dev *hdev, int type, void *data,
 
 	return 0;
 }
+
+#define __stream_reassembly(hdev)  ((hdev)->stream_reassembly)
+
+int hci_recv_stream_fragment(struct hci_dev *hdev, void *data, int count)
+{
+	int type;
+	int remaining = 0;
+	int err = 0;
+
+	do {
+		struct sk_buff *skb = __stream_reassembly(hdev);
+		if (!skb) {
+			struct { char type; } *pkt;
+
+			/* Start of the frame */
+			pkt = data;
+			type = pkt->type;
+
+			data++;
+			count--;
+		} else
+			type = bt_cb(skb)->pkt_type;
+
+		err = hci_reassembly(hdev, type, data, count, &skb, &remaining);
+
+		if (err < 0)
+			return err;
+
+		__stream_reassembly(hdev) = skb;
+
+		data += (count - remaining);
+		count = remaining;
+
+	} while (count);
+
+	return err;
+}
+EXPORT_SYMBOL(hci_recv_stream_fragment);
+
 /* Receive packet type fragment */
 #define __reassembly(hdev, type)  ((hdev)->reassembly[(type) - 2])
 
-- 
1.7.0



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