/*---------------------------------------------------------------------------*
* event handler, executes function and sets new state
*---------------------------------------------------------------------------*/
void i4b_next_l2state(l2_softc_t *l2sc, int event)
{
int currstate, newstate;
int (*savpostfsmfunc)(int) = NULL;
/* check event number */
if(event > N_EVENTS)
panic("i4b_l2fsm.c: event > N_EVENTS\n");
/* get current state and check it */
if((currstate = l2sc->Q921_state) > N_STATES) /* failsafe */
panic("i4b_l2fsm.c: currstate > N_STATES\n");
/* get new state and check it */
if((newstate = l2state_tab[event][currstate].newstate) > N_STATES)
panic("i4b_l2fsm.c: newstate > N_STATES\n");
if(newstate != ST_SUBSET)
{ /* state function does NOT set new state */
NDBGL2(L2_F_MSG, "FSM event [%s]: [%s/%d => %s/%d]",
l2event_text[event],
l2state_text[currstate], currstate,
l2state_text[newstate], newstate);
}
/* execute state transition function */
(*l2state_tab[event][currstate].func)(l2sc);
if(newstate == ST_SUBSET)
{ /* state function DOES set new state */
NDBGL2(L2_F_MSG, "FSM S-event [%s]: [%s => %s]", l2event_text[event],
l2state_text[currstate],
l2state_text[l2sc->Q921_state]);
}
/* check for illegal new state */
if(newstate == ST_ILL)
{
newstate = currstate;
NDBGL2(L2_F_ERR, "FSM illegal state, state = %s, event = %s!",
l2state_text[currstate],
l2event_text[event]);
}
/* check if state machine function has to set new state */
if(newstate != ST_SUBSET)
l2sc->Q921_state = newstate; /* no, we set new state */
if(l2sc->postfsmfunc != NULL)
{
NDBGL2(L2_F_MSG, "FSM executing postfsmfunc!");
/* try to avoid an endless loop */
savpostfsmfunc = l2sc->postfsmfunc;
l2sc->postfsmfunc = NULL;
(*savpostfsmfunc)(l2sc->postfsmarg);
}
}
/*---------------------------------------------------------------------------*
* got s or i frame, check if valid ack for last sent frame
*---------------------------------------------------------------------------*/
void
i4b_rxd_ack(l2_softc_t *l2sc, struct isdn_l3_driver *drv, int nr)
{
#ifdef NOTDEF
NDBGL2(L2_ERROR, "N(R)=%d, UA=%d, V(R)=%d, V(S)=%d, V(A)=%d",
nr,
l2sc->ua_num,
l2sc->vr,
l2sc->vs,
l2sc->va);
#endif
if(l2sc->ua_num != UA_EMPTY)
{
int s;
s = splnet();
M128DEC(nr);
if(l2sc->ua_num != nr)
NDBGL2(L2_ERROR, "((N(R)-1)=%d) != (UA=%d) !!!", nr, l2sc->ua_num);
i4b_Dfreembuf(l2sc->ua_frame);
l2sc->ua_num = UA_EMPTY;
splx(s);
}
}
/*---------------------------------------------------------------------------*
* got s or i frame, check if valid ack for last sent frame
*---------------------------------------------------------------------------*/
void
i4b_rxd_ack(l2_softc_t *l2sc, int nr)
{
#ifdef NOTDEF
NDBGL2(L2_ERROR, "N(R)=%d, UA=%d, V(R)=%d, V(S)=%d, V(A)=%d",
nr,
l2sc->ua_num,
l2sc->vr,
l2sc->vs,
l2sc->va);
#endif
if(l2sc->ua_num != UA_EMPTY)
{
CRIT_VAR;
CRIT_BEG;
M128DEC(nr);
if(l2sc->ua_num != nr)
NDBGL2(L2_ERROR, "((N(R)-1)=%d) != (UA=%d) !!!", nr, l2sc->ua_num);
i4b_Dfreembuf(l2sc->ua_frame);
l2sc->ua_num = UA_EMPTY;
CRIT_END;
}
}
/*---------------------------------------------------------------------------*
* FSM state ST_TEI_ASGD event dl establish request
*---------------------------------------------------------------------------*/
static void
F_T01(l2_softc_t *l2sc)
{
NDBGL2(L2_F_MSG, "FSM function F_T01 executing");
i4b_establish_data_link(l2sc);
l2sc->l3initiated = 1;
}
/*---------------------------------------------------------------------------*
* FSM state ST_TEI_ASGD event rx'd DM
*---------------------------------------------------------------------------*/
static void
F_T10(l2_softc_t *l2sc)
{
NDBGL2(L2_F_MSG, "FSM function F_T10 executing");
if(l2sc->rxd_PF)
{
l2sc->Q921_state = ST_TEI_ASGD;
}
else
{
#ifdef NOTDEF
if(NOT able_to_etablish)
{
l2sc->Q921_state = ST_TEI_ASGD;
return;
}
#endif
i4b_establish_data_link(l2sc);
l2sc->l3initiated = 1;
l2sc->Q921_state = ST_AW_EST;
}
}
/*---------------------------------------------------------------------------*
* FSM state ST_TEI_ASGD event dl release request
*---------------------------------------------------------------------------*/
static void
F_T13(l2_softc_t *l2sc)
{
NDBGL2(L2_F_MSG, "FSM function F_T13 executing");
l2sc->postfsmarg = l2sc->unit;
l2sc->postfsmfunc = DL_Rel_Cnf_A;
}
/*---------------------------------------------------------------------------*
* FSM state ST_MULTIFR event rx'd RNR
*---------------------------------------------------------------------------*/
static void
F_MF19(l2_softc_t *l2sc)
{
NDBGL2(L2_F_MSG, "FSM function F_MF19 executing");
l2sc->peer_busy = 1;
if(l2sc->rxd_CR == CR_CMD_FROM_NT)
{
if(l2sc->rxd_PF == 1)
{
i4b_enquiry_response(l2sc);
}
}
else
{
if(l2sc->rxd_PF == 1)
{
i4b_mdl_error_ind(l2sc, "F_MF19", MDL_ERR_A);
}
}
if(i4b_l2_nr_ok(l2sc->rxd_NR, l2sc->va, l2sc->vs))
{
l2sc->va = l2sc->rxd_NR;
i4b_T203_stop(l2sc);
i4b_T200_restart(l2sc);
l2sc->Q921_state = ST_MULTIFR;
}
else
{
i4b_nr_error_recovery(l2sc);
l2sc->Q921_state = ST_AW_EST;
}
}
/*---------------------------------------------------------------------------*
* check for v(a) <= n(r) <= v(s)
* nr = receive sequence frame counter, va = acknowledge sequence frame
* counter and vs = transmit sequence frame counter
*---------------------------------------------------------------------------*/
int
i4b_l2_nr_ok(int nr, int va, int vs)
{
if((va > nr) && ((nr != 0) || (va != 127)))
{
NDBGL2(L2_ERROR, "ERROR, va = %d, nr = %d, vs = %d [1]", va, nr, vs);
return 0; /* fail */
}
if((nr > vs) && ((vs != 0) || (nr != 127)))
{
NDBGL2(L2_ERROR, "ERROR, va = %d, nr = %d, vs = %d [2]", va, nr, vs);
return 0; /* fail */
}
return 1; /* good */
}
/*---------------------------------------------------------------------------*
* FSM state ST_AW_EST event T200 expiry
*---------------------------------------------------------------------------*/
static void
F_AE11(l2_softc_t *l2sc)
{
NDBGL2(L2_F_MSG, "FSM function F_AE11 executing");
if(l2sc->RC >= N200)
{
i4b_Dcleanifq(&l2sc->i_queue);
i4b_mdl_error_ind(l2sc, "F_AE11", MDL_ERR_G);
l2sc->postfsmarg = l2sc->unit;
l2sc->postfsmfunc = DL_Rel_Ind_A;
l2sc->Q921_state = ST_TEI_ASGD;
}
else
{
l2sc->RC++;
i4b_tx_sabme(l2sc, P1);
i4b_T200_start(l2sc);
l2sc->Q921_state = ST_AW_EST;
}
}
/*---------------------------------------------------------------------------*
* FSM state ST_AW_REL event rx'd DISC
*---------------------------------------------------------------------------*/
static void
F_AR08(l2_softc_t *l2sc)
{
NDBGL2(L2_F_MSG, "FSM function F_AR08 executing");
MDL_Status_Ind(l2sc->unit, STI_L2STAT, LAYER_IDLE);
i4b_tx_ua(l2sc, l2sc->rxd_PF);
}
/*---------------------------------------------------------------------------*
* FSM state ST_AW_REL event T200 expiry
*---------------------------------------------------------------------------*/
static void
F_AR11(l2_softc_t *l2sc)
{
NDBGL2(L2_F_MSG, "FSM function F_AR11 executing");
if(l2sc->RC >= N200)
{
i4b_mdl_error_ind(l2sc, "F_AR11", MDL_ERR_H);
l2sc->postfsmarg = l2sc->unit;
l2sc->postfsmfunc = DL_Rel_Cnf_A;
l2sc->Q921_state = ST_TEI_ASGD;
}
else
{
l2sc->RC++;
i4b_tx_disc(l2sc, P1);
i4b_T200_start(l2sc);
l2sc->Q921_state = ST_AW_REL;
}
}
/*---------------------------------------------------------------------------*
* FSM state ST_MULTIFR event rx'd SABME
*---------------------------------------------------------------------------*/
static void
F_MF07(l2_softc_t *l2sc)
{
NDBGL2(L2_F_MSG, "FSM function F_MF07 executing");
i4b_clear_exception_conditions(l2sc);
MDL_Status_Ind(l2sc->unit, STI_L2STAT, LAYER_ACTIVE);
i4b_tx_ua(l2sc, l2sc->rxd_PF);
i4b_mdl_error_ind(l2sc, "F_MF07", MDL_ERR_F);
if(l2sc->vs != l2sc->va)
{
i4b_Dcleanifq(&l2sc->i_queue);
l2sc->postfsmarg = l2sc->unit;
l2sc->postfsmfunc = DL_Est_Ind_A;
}
i4b_T200_stop(l2sc);
i4b_T203_start(l2sc);
l2sc->vs = 0;
l2sc->va = 0;
l2sc->vr = 0;
}
/*---------------------------------------------------------------------------*
* FSM state ST_MULTIFR event dl data request
*---------------------------------------------------------------------------*/
static void
F_MF12(l2_softc_t *l2sc)
{
NDBGL2(L2_F_MSG, "FSM function F_MF12 executing");
i4b_i_frame_queued_up(l2sc);
}
/*---------------------------------------------------------------------------*
* FSM state ST_TEI_ASGD event rx'd UA
*---------------------------------------------------------------------------*/
static void
F_T09(l2_softc_t *l2sc)
{
NDBGL2(L2_F_MSG, "FSM function F_T09 executing");
i4b_mdl_error_ind(l2sc, "F_T09", MDL_ERR_C);
i4b_mdl_error_ind(l2sc, "F_T09", MDL_ERR_D);
}
/*---------------------------------------------------------------------------*
* FSM state ST_TEI_ASGD event rx'd SABME
*---------------------------------------------------------------------------*/
static void
F_T07(l2_softc_t *l2sc)
{
NDBGL2(L2_F_MSG, "FSM function F_T07 executing");
/* XXX */
#ifdef NOTDEF
if(NOT able to establish)
{
i4b_tx_dm(l2sc, l2sc->rxd_PF);
l2sc->Q921_state = ST_TEI_ASGD;
return;
}
#endif
i4b_clear_exception_conditions(l2sc);
MDL_Status_Ind(l2sc->unit, STI_L2STAT, LAYER_ACTIVE);
i4b_tx_ua(l2sc, l2sc->rxd_PF);
l2sc->vs = 0;
l2sc->va = 0;
l2sc->vr = 0;
l2sc->postfsmarg = l2sc->unit;
l2sc->postfsmfunc = DL_Est_Ind_A;
i4b_T203_start(l2sc);
l2sc->Q921_state = ST_MULTIFR;
}
/*---------------------------------------------------------------------------*
* FSM state ST_MULTIFR event T203 expiry
*---------------------------------------------------------------------------*/
static void
F_MF14(l2_softc_t *l2sc)
{
NDBGL2(L2_F_MSG, "FSM function F_MF14 executing");
i4b_transmit_enquire(l2sc);
l2sc->RC = 0;
}
/*---------------------------------------------------------------------------*
* FSM state ST_AW_EST event dl establish request
*---------------------------------------------------------------------------*/
static void
F_AE01(l2_softc_t *l2sc)
{
NDBGL2(L2_F_MSG, "FSM function F_AE01 executing");
i4b_Dcleanifq(&l2sc->i_queue);
l2sc->l3initiated = 1;
}
/*---------------------------------------------------------------------------*
* Q.921 timer T202 timeout function
*---------------------------------------------------------------------------*/
static void
i4b_T202_timeout(l2_softc_t *l2sc)
{
NDBGL2(L2_T_ERR, "bri %d, N202 = %d", l2sc->drv->bri, l2sc->N202);
if(--(l2sc->N202))
{
(*l2sc->T202func)(l2sc);
}
}
/*---------------------------------------------------------------------------*
* transmit DISC command
*---------------------------------------------------------------------------*/
void
i4b_tx_disc(l2_softc_t *l2sc, pbit_t pbit)
{
struct mbuf *m;
l2sc->stat.tx_disc++;
NDBGL2(L2_U_MSG, "tx DISC, tei = %d", l2sc->tei);
m = i4b_build_u_frame(l2sc, CR_CMD_TO_NT, pbit, DISC);
PH_Data_Req(l2sc->unit, m, MBUF_FREE);
}
/*---------------------------------------------------------------------------*
* transmit FRMR response
*---------------------------------------------------------------------------*/
void
i4b_tx_frmr(l2_softc_t *l2sc, fbit_t fbit)
{
struct mbuf *m;
l2sc->stat.tx_frmr++;
NDBGL2(L2_U_MSG, "tx FRMR, tei = %d", l2sc->tei);
m = i4b_build_u_frame(l2sc, CR_RSP_TO_NT, fbit, FRMR);
PH_Data_Req(l2sc->unit, m, MBUF_FREE);
}
/*---------------------------------------------------------------------------*
* FSM state ST_AW_REL event persistent deactivation
*---------------------------------------------------------------------------*/
static void
F_AR05(l2_softc_t *l2sc)
{
NDBGL2(L2_F_MSG, "FSM function F_AR05 executing");
l2sc->postfsmarg = l2sc->unit;
l2sc->postfsmfunc = DL_Rel_Cnf_A;
i4b_T200_stop(l2sc);
}
/*---------------------------------------------------------------------------*
* FSM state ST_AW_EST event dl data request
*---------------------------------------------------------------------------*/
static void
F_AE12(l2_softc_t *l2sc)
{
NDBGL2(L2_F_MSG, "FSM function F_AE12 executing");
if(l2sc->l3initiated == 0)
{
i4b_i_frame_queued_up(l2sc);
}
}
/*---------------------------------------------------------------------------*
* Q.921 timer T200 start
*---------------------------------------------------------------------------*/
void
i4b_T200_start(l2_softc_t *l2sc)
{
if(l2sc->T200 == TIMER_ACTIVE)
return;
NDBGL2(L2_T_MSG, "bri %d", l2sc->drv->bri);
l2sc->T200 = TIMER_ACTIVE;
START_TIMER(l2sc->T200_callout, i4b_T200_timeout, l2sc, T200DEF);
}
/*---------------------------------------------------------------------------*
* FSM state ST_TIMREC event rx'd FRMR
*---------------------------------------------------------------------------*/
static void
F_TR20(l2_softc_t *l2sc)
{
NDBGL2(L2_F_MSG, "FSM function F_TR20 executing");
i4b_mdl_error_ind(l2sc, "F_TR20", MDL_ERR_K);
i4b_establish_data_link(l2sc);
l2sc->l3initiated = 0;
}
/*---------------------------------------------------------------------------*
* routine INVOKE RETRANSMISSION (Q.921 03/93 page 84)
*---------------------------------------------------------------------------*/
void
i4b_invoke_retransmission(l2_softc_t *l2sc, int nr)
{
CRIT_VAR;
CRIT_BEG;
NDBGL2(L2_ERROR, "nr = %d", nr );
while(l2sc->vs != nr)
{
NDBGL2(L2_ERROR, "nr(%d) != vs(%d)", nr, l2sc->vs);
M128DEC(l2sc->vs);
/* XXXXXXXXXXXXXXXXX */
if((l2sc->ua_num != UA_EMPTY) && (l2sc->vs == l2sc->ua_num))
{
if(_IF_QFULL(&l2sc->i_queue))
{
NDBGL2(L2_ERROR, "ERROR, I-queue full!");
}
else
{
IF_ENQUEUE(&l2sc->i_queue, l2sc->ua_frame);
l2sc->ua_num = UA_EMPTY;
}
}
else
{
NDBGL2(L2_ERROR, "ERROR, l2sc->vs = %d, l2sc->ua_num = %d ",l2sc->vs, l2sc->ua_num);
}
/* XXXXXXXXXXXXXXXXX */
i4b_i_frame_queued_up(l2sc);
}
CRIT_END;
}
/*---------------------------------------------------------------------------*
* FSM state ST_AW_REL event mdl remove request
*---------------------------------------------------------------------------*/
static void
F_AR06(l2_softc_t *l2sc)
{
NDBGL2(L2_F_MSG, "FSM function F_AR06 executing");
l2sc->postfsmarg = l2sc->unit;
l2sc->postfsmfunc = DL_Rel_Cnf_A;
i4b_T200_stop(l2sc);
/*XXX*/ i4b_mdl_assign_ind(l2sc);
}
/*---------------------------------------------------------------------------*
* i4b_print_l2var - print some l2softc vars
*---------------------------------------------------------------------------*/
void
i4b_print_l2var(l2_softc_t *l2sc)
{
NDBGL2(L2_ERROR, "unit%d V(R)=%d, V(S)=%d, V(A)=%d,ACKP=%d,PBSY=%d,OBSY=%d",
l2sc->unit,
l2sc->vr,
l2sc->vs,
l2sc->va,
l2sc->ack_pend,
l2sc->peer_busy,
l2sc->own_busy);
}
/*---------------------------------------------------------------------------*
* FSM state ST_AW_EST event persistent deactivation
*---------------------------------------------------------------------------*/
static void
F_AE05(l2_softc_t *l2sc)
{
NDBGL2(L2_F_MSG, "FSM function F_AE05 executing");
i4b_Dcleanifq(&l2sc->i_queue);
l2sc->postfsmarg = l2sc->unit;
l2sc->postfsmfunc = DL_Rel_Ind_A;
i4b_T200_stop(l2sc);
}
/*---------------------------------------------------------------------------*
* FSM state ST_TIMREC event dl release request
*---------------------------------------------------------------------------*/
static void
F_TR13(l2_softc_t *l2sc)
{
NDBGL2(L2_F_MSG, "FSM function F_TR13 executing");
i4b_Dcleanifq(&l2sc->i_queue);
l2sc->RC = 0;
i4b_tx_disc(l2sc, P1);
i4b_T200_restart(l2sc);
}
/*---------------------------------------------------------------------------*
* Q.921 timer T203 start
*---------------------------------------------------------------------------*/
void
i4b_T203_start(l2_softc_t *l2sc)
{
#if I4B_T203_ACTIVE
if (l2sc->T203 == TIMER_ACTIVE)
return;
NDBGL2(L2_T_MSG, "bri %d", l2sc->bri);
l2sc->T203 = TIMER_ACTIVE;
START_TIMER(l2sc->T203_callout, i4b_T203_timeout, l2sc, T203DEF);
#endif
}
