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Bluetooth: Add support for Retransmission and Monitor Timers

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L2CAP uses retransmission and monitor timers to inquiry the other side
about unacked I-frames. After sending each I-frame we (re)start the
retransmission timer. If it expires, we start a monitor timer that send a
S-frame with P bit set and wait for S-frame with F bit set. If monitor
timer expires, try again, at a maximum of L2CAP_DEFAULT_MAX_TX.

Signed-off-by: Gustavo F. Padovan <gustavo@las.ic.unicamp.br>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
This commit is contained in:
Gustavo F. Padovan
2009-08-20 22:26:00 -03:00
committed by Marcel Holtmann
parent 30afb5b2aa
commit e90bac061b
3 changed files with 95 additions and 7 deletions
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1
include/net/bluetooth/bluetooth.h
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@@ -139,6 +139,7 @@ struct bt_skb_cb {
__u8 pkt_type;
__u8 incoming;
__u8 tx_seq;
__u8 retries;
};
#define bt_cb(skb) ((struct bt_skb_cb *)((skb)->cb))

15
include/net/bluetooth/l2cap.h
View File

@@ -31,9 +31,9 @@
#define L2CAP_DEFAULT_FLUSH_TO 0xffff
#define L2CAP_DEFAULT_TX_WINDOW 63
#define L2CAP_DEFAULT_NUM_TO_ACK (L2CAP_DEFAULT_TX_WINDOW/5)
#define L2CAP_DEFAULT_MAX_RECEIVE 1
#define L2CAP_DEFAULT_RETRANS_TO 300 /* 300 milliseconds */
#define L2CAP_DEFAULT_MONITOR_TO 1000 /* 1 second */
#define L2CAP_DEFAULT_MAX_TX 3
#define L2CAP_DEFAULT_RETRANS_TO 1000 /* 1 second */
#define L2CAP_DEFAULT_MONITOR_TO 12000 /* 12 seconds */
#define L2CAP_DEFAULT_MAX_PDU_SIZE 672
#define L2CAP_CONN_TIMEOUT (40000) /* 40 seconds */
@@ -318,6 +318,7 @@ struct l2cap_pinfo {
__u8 req_seq;
__u8 expected_tx_seq;
__u8 unacked_frames;
__u8 retry_count;
__u8 num_to_ack;
__u16 sdu_len;
__u16 partial_sdu_len;
@@ -333,6 +334,8 @@ struct l2cap_pinfo {
__le16 sport;
struct timer_list retrans_timer;
struct timer_list monitor_timer;
struct sk_buff_head tx_queue;
struct l2cap_conn *conn;
struct sock *next_c;
@@ -352,6 +355,12 @@ struct l2cap_pinfo {
#define L2CAP_CONN_SAR_SDU 0x01
#define L2CAP_CONN_UNDER_REJ 0x02
#define L2CAP_CONN_WAIT_F 0x04
#define __mod_retrans_timer() mod_timer(&l2cap_pi(sk)->retrans_timer, \
jiffies + msecs_to_jiffies(L2CAP_DEFAULT_RETRANS_TO));
#define __mod_monitor_timer() mod_timer(&l2cap_pi(sk)->monitor_timer, \
jiffies + msecs_to_jiffies(L2CAP_DEFAULT_MONITOR_TO));
static inline int l2cap_tx_window_full(struct sock *sk)
{