LAPD: Add support for RTS based polling and T200
The T200 timer is started when the current frame is polled at
PH-READY-TO-SEND event.
A flag is used to enable this feature. The user of LAPD core must track
frame numbers to check the timeout condition. Then it must call the
external timeout function.
Related: OS#4074
Change-Id: Ib961b5a44911b99b0487641533301749c0286995
diff --git a/include/osmocom/isdn/lapd_core.h b/include/osmocom/isdn/lapd_core.h
index e4e8b46..776d4f4 100644
--- a/include/osmocom/isdn/lapd_core.h
+++ b/include/osmocom/isdn/lapd_core.h
@@ -84,6 +84,16 @@
LAPD_STATE_TIMER_RECOV,
};
+/*! lapd_flags */
+#define LAPD_F_RTS 0x0001
+
+/*! LAPD T200 state in RTS mode */
+enum lapd_t200_rts {
+ LAPD_T200_RTS_OFF = 0,
+ LAPD_T200_RTS_PENDING,
+ LAPD_T200_RTS_RUNNING,
+};
+
/*! LAPD message format (I / S / U) */
enum lapd_format {
LAPD_FORM_UKN = 0,
@@ -133,6 +143,7 @@
struct lapd_cr_ent rem2loc;
} cr;
enum lapd_mode mode; /*!< current mode of link */
+ unsigned int lapd_flags; /*!< \ref lapd_flags to change processing */
int use_sabme; /*!< use SABME instead of SABM */
int reestablish; /*!< enable reestablish support */
int n200, n200_est_rel; /*!< number of retranmissions */
@@ -149,6 +160,7 @@
uint8_t peer_busy; /*!< receiver busy on remote side */
int t200_sec, t200_usec; /*!< retry timer (default 1 sec) */
int t203_sec, t203_usec; /*!< retry timer (default 10 secs) */
+ enum lapd_t200_rts t200_rts; /*!< state of T200 in RTS mode */
struct osmo_timer_list t200; /*!< T200 timer */
struct osmo_timer_list t203; /*!< T203 timer */
uint8_t retrans_ctr; /*!< re-transmission counter */
@@ -169,8 +181,11 @@
void lapd_dl_set_name(struct lapd_datalink *dl, const char *name);
void lapd_dl_exit(struct lapd_datalink *dl);
void lapd_dl_reset(struct lapd_datalink *dl);
+int lapd_dl_set_flags(struct lapd_datalink *dl, unsigned int flags);
int lapd_set_mode(struct lapd_datalink *dl, enum lapd_mode mode);
int lapd_ph_data_ind(struct msgb *msg, struct lapd_msg_ctx *lctx);
+int lapd_ph_rts_ind(struct lapd_msg_ctx *lctx);
int lapd_recv_dlsap(struct osmo_dlsap_prim *dp, struct lapd_msg_ctx *lctx);
+int lapd_t200_timeout(struct lapd_datalink *dl);
/*! @} */