Bluetooth: EWS: support extended seq numbers

Adds support for extended sequence numbers found in
extended control fields.

Signed-off-by: Andrei Emeltchenko <andrei.emeltchenko@intel.com>
Signed-off-by: Gustavo F. Padovan <padovan@profusion.mobi>

1 files changed, 17 insertions, 0 deletions

diff --git a/include/net/bluetooth/l2cap.h b/include/net/bluetooth/l2cap.h
index 41f0906649ee..fddc82afeafc 100644
--- a/include/net/bluetooth/l2cap.h
+++ b/include/net/bluetooth/l2cap.h
@@ -381,6 +381,7 @@ struct l2cap_chan {
         __u8            fcs;
 
         __u16           tx_win;
+        __u16           tx_win_max;
         __u8            max_tx;
         __u16           retrans_timeout;
         __u16           monitor_timeout;
@@ -543,6 +544,22 @@ enum {
                 L2CAP_DEFAULT_ACK_TO);
 #define __clear_ack_timer(c) l2cap_clear_timer(c, &c->ack_timer)
 
+static inline int __seq_offset(struct l2cap_chan *chan, __u16 seq1, __u16 seq2)
+{
+        int offset;
+
+        offset = (seq1 - seq2) % (chan->tx_win_max + 1);
+        if (offset < 0)
+                offset += (chan->tx_win_max + 1);
+
+        return offset;
+}
+
+static inline __u16 __next_seq(struct l2cap_chan *chan, __u16 seq)
+{
+        return (seq + 1) % (chan->tx_win_max + 1);
+}
+
 static inline int l2cap_tx_window_full(struct l2cap_chan *ch)
 {
         int sub;