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Bluetooth: Implement 'Send IorRRorRNR' event

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After receive a RR with P bit set ERTM shall use this funcion to choose
what type of frame to reply with F bit = 1.

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 16:15:36 -03:00 committed by Marcel Holtmann
parent e8235c6bdd
commit d5392c8f1e
2 changed files with 50 additions and 13 deletions
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20
include/net/bluetooth/l2cap.h
View File

@ -320,7 +320,7 @@ struct l2cap_pinfo {
__u8 conf_req[64];
__u8 conf_len;
__u8 conf_state;
__u8 conn_state;
__u16 conn_state;
__u8 next_tx_seq;
__u8 expected_ack_seq;
@ -328,6 +328,7 @@ struct l2cap_pinfo {
__u8 buffer_seq;
__u8 buffer_seq_srej;
__u8 srej_save_reqseq;
__u8 frames_sent;
__u8 unacked_frames;
__u8 retry_count;
__u8 num_to_ack;
@ -367,14 +368,15 @@ struct l2cap_pinfo {
#define L2CAP_CONF_MAX_CONF_REQ 2
#define L2CAP_CONF_MAX_CONF_RSP 2
#define L2CAP_CONN_SAR_SDU 0x01
#define L2CAP_CONN_SREJ_SENT 0x02
#define L2CAP_CONN_WAIT_F 0x04
#define L2CAP_CONN_SREJ_ACT 0x08
#define L2CAP_CONN_SEND_PBIT 0x10
#define L2CAP_CONN_REMOTE_BUSY 0x20
#define L2CAP_CONN_LOCAL_BUSY 0x40
#define L2CAP_CONN_REJ_ACT 0x80
#define L2CAP_CONN_SAR_SDU 0x0001
#define L2CAP_CONN_SREJ_SENT 0x0002
#define L2CAP_CONN_WAIT_F 0x0004
#define L2CAP_CONN_SREJ_ACT 0x0008
#define L2CAP_CONN_SEND_PBIT 0x0010
#define L2CAP_CONN_REMOTE_BUSY 0x0020
#define L2CAP_CONN_LOCAL_BUSY 0x0040
#define L2CAP_CONN_REJ_ACT 0x0080
#define L2CAP_CONN_SEND_FBIT 0x0100
#define __mod_retrans_timer() mod_timer(&l2cap_pi(sk)->retrans_timer, \
jiffies + msecs_to_jiffies(L2CAP_DEFAULT_RETRANS_TO));

43
net/bluetooth/l2cap.c
View File

@ -1383,6 +1383,10 @@ static int l2cap_ertm_send(struct sock *sk)
bt_cb(skb)->retries++;
control = get_unaligned_le16(tx_skb->data + L2CAP_HDR_SIZE);
if (pi->conn_state & L2CAP_CONN_SEND_FBIT) {
control |= L2CAP_CTRL_FINAL;
pi->conn_state &= ~L2CAP_CONN_SEND_FBIT;
}
control |= (pi->buffer_seq << L2CAP_CTRL_REQSEQ_SHIFT)
| (pi->next_tx_seq << L2CAP_CTRL_TXSEQ_SHIFT);
put_unaligned_le16(control, tx_skb->data + L2CAP_HDR_SIZE);
@ -1404,6 +1408,7 @@ static int l2cap_ertm_send(struct sock *sk)
pi->next_tx_seq = (pi->next_tx_seq + 1) % 64;
pi->unacked_frames++;
pi->frames_sent++;
if (skb_queue_is_last(TX_QUEUE(sk), skb))
sk->sk_send_head = NULL;
@ -2191,6 +2196,7 @@ static inline void l2cap_ertm_init(struct sock *sk)
l2cap_pi(sk)->unacked_frames = 0;
l2cap_pi(sk)->buffer_seq = 0;
l2cap_pi(sk)->num_to_ack = 0;
l2cap_pi(sk)->frames_sent = 0;
setup_timer(&l2cap_pi(sk)->retrans_timer,
l2cap_retrans_timeout, (unsigned long) sk);
@ -3148,6 +3154,38 @@ static int l2cap_check_fcs(struct l2cap_pinfo *pi, struct sk_buff *skb)
return 0;
}
static inline void l2cap_send_i_or_rr_or_rnr(struct sock *sk)
{
struct l2cap_pinfo *pi = l2cap_pi(sk);
u16 control = 0;
pi->frames_sent = 0;
pi->conn_state |= L2CAP_CONN_SEND_FBIT;
control |= pi->buffer_seq << L2CAP_CTRL_REQSEQ_SHIFT;
if (pi->conn_state & L2CAP_CONN_LOCAL_BUSY) {
control |= L2CAP_SUPER_RCV_NOT_READY | L2CAP_CTRL_FINAL;
l2cap_send_sframe(pi, control);
pi->conn_state &= ~L2CAP_CONN_SEND_FBIT;
}
if (pi->conn_state & L2CAP_CONN_REMOTE_BUSY && pi->unacked_frames > 0)
__mod_retrans_timer();
l2cap_ertm_send(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);
}
}
static void l2cap_add_to_srej_queue(struct sock *sk, struct sk_buff *skb, u8 tx_seq, u8 sar)
{
struct sk_buff *next_skb;
@ -3418,10 +3456,7 @@ static inline int l2cap_data_channel_sframe(struct sock *sk, u16 rx_control, str
switch (rx_control & L2CAP_CTRL_SUPERVISE) {
case L2CAP_SUPER_RCV_READY:
if (rx_control & L2CAP_CTRL_POLL) {
u16 control = L2CAP_CTRL_FINAL;
control |= L2CAP_SUPER_RCV_READY |
(pi->buffer_seq << L2CAP_CTRL_REQSEQ_SHIFT);
l2cap_send_sframe(l2cap_pi(sk), control);
l2cap_send_i_or_rr_or_rnr(sk);
pi->conn_state &= ~L2CAP_CONN_REMOTE_BUSY;
} else if (rx_control & L2CAP_CTRL_FINAL) {