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Bluetooth: Implement SendAck() Action on ERTM.

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Shall be used to ack received frames, It must decide type of
acknowledgment between a RR frame, a RNR frame or transmission of
pending I-frames.
It also modifies l2cap_ertm_send() to report the number of frames sent.

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>
This commit is contained in:
Gustavo F. Padovan 2010-05-01 16:15:37 -03:00 committed by Marcel Holtmann
parent 36f2fd585f
commit 9e917af13d
1 changed files with 29 additions and 12 deletions
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41
net/bluetooth/l2cap.c
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@ -352,6 +352,11 @@ static inline int l2cap_send_sframe(struct l2cap_pinfo *pi, u16 control)
count = min_t(unsigned int, conn->mtu, hlen);
control |= L2CAP_CTRL_FRAME_TYPE;
if (pi->conn_state & L2CAP_CONN_SEND_FBIT) {
control |= L2CAP_CTRL_FINAL;
pi->conn_state &= ~L2CAP_CONN_SEND_FBIT;
}
skb = bt_skb_alloc(count, GFP_ATOMIC);
if (!skb)
return -ENOMEM;
@ -1364,7 +1369,7 @@ static int l2cap_ertm_send(struct sock *sk)
struct sk_buff *skb, *tx_skb;
struct l2cap_pinfo *pi = l2cap_pi(sk);
u16 control, fcs;
int err;
int err, nsent = 0;
if (pi->conn_state & L2CAP_CONN_WAIT_F)
return 0;
@ -1414,8 +1419,27 @@ static int l2cap_ertm_send(struct sock *sk)
sk->sk_send_head = NULL;
else
sk->sk_send_head = skb_queue_next(TX_QUEUE(sk), skb);
nsent++;
}
return nsent;
}
static int l2cap_send_ack(struct l2cap_pinfo *pi)
{
struct sock *sk = (struct sock *)pi;
u16 control = 0;
control |= pi->buffer_seq << L2CAP_CTRL_REQSEQ_SHIFT;
if (pi->conn_state & L2CAP_CONN_LOCAL_BUSY) {
control |= L2CAP_SUPER_RCV_NOT_READY;
return l2cap_send_sframe(pi, control);
} else if (l2cap_ertm_send(sk) == 0) {
control |= L2CAP_SUPER_RCV_READY;
return l2cap_send_sframe(pi, control);
}
return 0;
}
@ -1678,7 +1702,7 @@ static int l2cap_sock_sendmsg(struct kiocb *iocb, struct socket *sock, struct ms
else
err = l2cap_ertm_send(sk);
if (!err)
if (err >= 0)
err = len;
break;
@ -3178,10 +3202,6 @@ static inline void l2cap_send_i_or_rr_or_rnr(struct sock *sk)
if (!(pi->conn_state & L2CAP_CONN_LOCAL_BUSY) &&
pi->frames_sent == 0) {
control |= L2CAP_SUPER_RCV_READY;
if (pi->conn_state & L2CAP_CONN_SEND_FBIT) {
control |= L2CAP_CTRL_FINAL;
pi->conn_state &= ~L2CAP_CONN_SEND_FBIT;
}
l2cap_send_sframe(pi, control);
}
}
@ -3362,7 +3382,6 @@ static inline int l2cap_data_channel_iframe(struct sock *sk, u16 rx_control, str
struct l2cap_pinfo *pi = l2cap_pi(sk);
u8 tx_seq = __get_txseq(rx_control);
u8 req_seq = __get_reqseq(rx_control);
u16 tx_control = 0;
u8 sar = rx_control >> L2CAP_CTRL_SAR_SHIFT;
int err = 0;
@ -3449,11 +3468,9 @@ static inline int l2cap_data_channel_iframe(struct sock *sk, u16 rx_control, str
return err;
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) {
tx_control |= L2CAP_SUPER_RCV_READY;
tx_control |= pi->buffer_seq << L2CAP_CTRL_REQSEQ_SHIFT;
l2cap_send_sframe(pi, tx_control);
}
if (pi->num_to_ack == L2CAP_DEFAULT_NUM_TO_ACK - 1)
l2cap_send_ack(pi);
return 0;
}