Bluetooth: Implement Local Busy Condition handling

Supports Local Busy condition handling through a waitqueue that wake ups
each 200ms and try to push the packets to the upper layer. If it can
push all the queue then it leaves the Local Busy state.

The patch modifies the behaviour of l2cap_ertm_reassembly_sdu() to
support retry of the push operation.

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, 6 insertions, 0 deletions

diff --git a/include/net/bluetooth/l2cap.h b/include/net/bluetooth/l2cap.h
index 8942c2ffc58b..d0185cc04c14 100644
--- a/include/net/bluetooth/l2cap.h
+++ b/include/net/bluetooth/l2cap.h
@@ -35,6 +35,7 @@
 #define L2CAP_DEFAULT_MONITOR_TO        12000   /* 12 seconds */
 #define L2CAP_DEFAULT_MAX_PDU_SIZE      672
 #define L2CAP_DEFAULT_ACK_TO            200
+#define L2CAP_LOCAL_BUSY_TRIES          12
 
 #define L2CAP_CONN_TIMEOUT      (40000) /* 40 seconds */
 #define L2CAP_INFO_TIMEOUT      (4000)  /*  4 seconds */
@@ -294,6 +295,7 @@ struct l2cap_conn {
 #define l2cap_pi(sk) ((struct l2cap_pinfo *) sk)
 #define TX_QUEUE(sk) (&l2cap_pi(sk)->tx_queue)
 #define SREJ_QUEUE(sk) (&l2cap_pi(sk)->srej_queue)
+#define BUSY_QUEUE(sk) (&l2cap_pi(sk)->busy_queue)
 #define SREJ_LIST(sk) (&l2cap_pi(sk)->srej_l.list)
 
 struct srej_list {
@@ -356,6 +358,8 @@ struct l2cap_pinfo {
         struct timer_list       ack_timer;
         struct sk_buff_head     tx_queue;
         struct sk_buff_head     srej_queue;
+        struct sk_buff_head     busy_queue;
+        struct work_struct      busy_work;
         struct srej_list        srej_l;
         struct l2cap_conn       *conn;
         struct sock             *next_c;
@@ -383,6 +387,8 @@ struct l2cap_pinfo {
 #define L2CAP_CONN_LOCAL_BUSY      0x0040
 #define L2CAP_CONN_REJ_ACT         0x0080
 #define L2CAP_CONN_SEND_FBIT       0x0100
+#define L2CAP_CONN_RNR_SENT        0x0200
+#define L2CAP_CONN_SAR_RETRY       0x0400
 
 #define __mod_retrans_timer() mod_timer(&l2cap_pi(sk)->retrans_timer, \
                 jiffies +  msecs_to_jiffies(L2CAP_DEFAULT_RETRANS_TO));