Bluetooth: Refactor l2cap_streaming_send

This new implementation uses struct l2cap_ctrl to compose the
streaming mode headers.

Signed-off-by: Mat Martineau <mathewm@codeaurora.org>
Signed-off-by: Gustavo Padovan <gustavo.padovan@collabora.co.uk>

net/bluetooth/l2cap_core.c

@@ -1650,29 +1650,45 @@ static void l2cap_drop_acked_frames(struct l2cap_chan *chan)
 		__clear_retrans_timer(chan);
 }
 
-static void l2cap_streaming_send(struct l2cap_chan *chan)
+static int l2cap_streaming_send(struct l2cap_chan *chan,
+				struct sk_buff_head *skbs)
 {
 	struct sk_buff *skb;
-	u32 control;
-	u16 fcs;
+	struct l2cap_ctrl *control;
 
-	while ((skb = skb_dequeue(&chan->tx_q))) {
-		control = __get_control(chan, skb->data + L2CAP_HDR_SIZE);
-		control |= __set_txseq(chan, chan->next_tx_seq);
-		control |= __set_ctrl_sar(chan, bt_cb(skb)->control.sar);
-		__put_control(chan, control, skb->data + L2CAP_HDR_SIZE);
+	BT_DBG("chan %p, skbs %p", chan, skbs);
+
+	if (chan->state != BT_CONNECTED)
+		return -ENOTCONN;
+
+	skb_queue_splice_tail_init(skbs, &chan->tx_q);
+
+	while (!skb_queue_empty(&chan->tx_q)) {
+
+		skb = skb_dequeue(&chan->tx_q);
+
+		bt_cb(skb)->control.retries = 1;
+		control = &bt_cb(skb)->control;
+
+		control->reqseq = 0;
+		control->txseq = chan->next_tx_seq;
+
+		__pack_control(chan, control, skb);
 
 		if (chan->fcs == L2CAP_FCS_CRC16) {
-			fcs = crc16(0, (u8 *)skb->data,
-						skb->len - L2CAP_FCS_SIZE);
-			put_unaligned_le16(fcs,
-					skb->data + skb->len - L2CAP_FCS_SIZE);
+			u16 fcs = crc16(0, (u8 *) skb->data, skb->len);
+			put_unaligned_le16(fcs, skb_put(skb, L2CAP_FCS_SIZE));
 		}
 
 		l2cap_do_send(chan, skb);
 
+		BT_DBG("Sent txseq %d", (int)control->txseq);
+
 		chan->next_tx_seq = __next_seq(chan, chan->next_tx_seq);
+		chan->frames_sent++;
 	}
+
+	return 0;
 }
 
 static void l2cap_retransmit_one_frame(struct l2cap_chan *chan, u16 tx_seq)
@@ -2136,13 +2152,11 @@ int l2cap_chan_send(struct l2cap_chan *chan, struct msghdr *msg, size_t len,
 		if (err)
 			break;
 
-		if (chan->mode == L2CAP_MODE_ERTM) {
+		if (chan->mode == L2CAP_MODE_ERTM)
 			err = l2cap_tx(chan, 0, &seg_queue,
 				       L2CAP_EV_DATA_REQUEST);
-		} else {
-			skb_queue_splice_tail_init(&seg_queue, &chan->tx_q);
-			l2cap_streaming_send(chan);
-		}
+		else
+			err = l2cap_streaming_send(chan, &seg_queue);
 
 		if (!err)
 			err = len;