Bluetooth: Change acknowledgement to use the value of txWindow

Now that we can set the txWindow we need to change the acknowledgement
procedure to ack after each (pi->txWindow/6 + 1). The plus 1 is to avoid
the zero value.
It also renames pi->num_to_ack to a better name: pi->num_acked.

Signed-off-by: Gustavo F. Padovan <padovan@profusion.mobi>
Reviewed-by: João Paulo Rechi Vita <jprvita@profusion.mobi>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>

1 files changed, 4 insertions, 3 deletions

diff --git a/net/bluetooth/l2cap.c b/net/bluetooth/l2cap.c
index 530079649b43..0b0b237bb786 100644
--- a/net/bluetooth/l2cap.c
+++ b/net/bluetooth/l2cap.c
@@ -2254,7 +2254,7 @@ static inline void l2cap_ertm_init(struct sock *sk)
         l2cap_pi(sk)->expected_ack_seq = 0;
         l2cap_pi(sk)->unacked_frames = 0;
         l2cap_pi(sk)->buffer_seq = 0;
-        l2cap_pi(sk)->num_to_ack = 0;
+        l2cap_pi(sk)->num_acked = 0;
         l2cap_pi(sk)->frames_sent = 0;
 
         setup_timer(&l2cap_pi(sk)->retrans_timer,
@@ -3466,6 +3466,7 @@ static inline int l2cap_data_channel_iframe(struct sock *sk, u16 rx_control, str
         u8 tx_seq = __get_txseq(rx_control);
         u8 req_seq = __get_reqseq(rx_control);
         u8 sar = rx_control >> L2CAP_CTRL_SAR_SHIFT;
+        int num_to_ack = (pi->tx_win/6) + 1;
         int err = 0;
 
         BT_DBG("sk %p rx_control 0x%4.4x len %d", sk, rx_control, skb->len);
@@ -3553,8 +3554,8 @@ expected:
 
         __mod_ack_timer();
 
-        pi->num_to_ack = (pi->num_to_ack + 1) % L2CAP_DEFAULT_NUM_TO_ACK;
-        if (pi->num_to_ack == L2CAP_DEFAULT_NUM_TO_ACK - 1)
+        pi->num_acked = (pi->num_acked + 1) % num_to_ack;
+        if (pi->num_acked == num_to_ack - 1)
                 l2cap_send_ack(pi);
 
         return 0;