291 lines
7.0 KiB
C
291 lines
7.0 KiB
C
/*
|
|
* Copyright (c) 1997, 2000 Hellmuth Michaelis. All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
|
|
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
|
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
* SUCH DAMAGE.
|
|
*
|
|
*---------------------------------------------------------------------------
|
|
*
|
|
* i4b_iframe.c - i frame handling routines
|
|
* ------------------------------------------
|
|
*
|
|
* $Id: i4b_iframe.c,v 1.25 2000/08/24 11:48:57 hm Exp $
|
|
*
|
|
* $FreeBSD$
|
|
*
|
|
* last edit-date: [Thu Aug 24 12:49:18 2000]
|
|
*
|
|
*---------------------------------------------------------------------------*/
|
|
|
|
#ifdef __FreeBSD__
|
|
#include "i4bq921.h"
|
|
#else
|
|
#define NI4BQ921 1
|
|
#endif
|
|
#if NI4BQ921 > 0
|
|
|
|
#include <sys/param.h>
|
|
#include <sys/kernel.h>
|
|
#include <sys/systm.h>
|
|
#include <sys/mbuf.h>
|
|
#include <sys/socket.h>
|
|
#include <net/if.h>
|
|
|
|
#if defined(__NetBSD__) && __NetBSD_Version__ >= 104230000
|
|
#include <sys/callout.h>
|
|
#endif
|
|
|
|
#ifdef __FreeBSD__
|
|
#include <machine/i4b_debug.h>
|
|
#include <machine/i4b_trace.h>
|
|
#else
|
|
#include <i4b/i4b_debug.h>
|
|
#include <i4b/i4b_ioctl.h>
|
|
#include <i4b/i4b_trace.h>
|
|
#endif
|
|
|
|
#include <i4b/include/i4b_global.h>
|
|
#include <i4b/include/i4b_l1l2.h>
|
|
#include <i4b/include/i4b_l2l3.h>
|
|
#include <i4b/include/i4b_mbuf.h>
|
|
|
|
#include <i4b/layer2/i4b_l2.h>
|
|
#include <i4b/layer2/i4b_l2fsm.h>
|
|
|
|
/*---------------------------------------------------------------------------*
|
|
* process i frame
|
|
* implements the routine "I COMMAND" Q.921 03/93 pp 68 and pp 77
|
|
*---------------------------------------------------------------------------*/
|
|
void
|
|
i4b_rxd_i_frame(int unit, struct mbuf *m)
|
|
{
|
|
l2_softc_t *l2sc = &l2_softc[unit];
|
|
u_char *ptr = m->m_data;
|
|
int nr;
|
|
int ns;
|
|
int p;
|
|
CRIT_VAR;
|
|
|
|
if(!((l2sc->tei_valid == TEI_VALID) &&
|
|
(l2sc->tei == GETTEI(*(ptr+OFF_TEI)))))
|
|
{
|
|
i4b_Dfreembuf(m);
|
|
return;
|
|
}
|
|
|
|
if((l2sc->Q921_state != ST_MULTIFR) && (l2sc->Q921_state != ST_TIMREC))
|
|
{
|
|
i4b_Dfreembuf(m);
|
|
NDBGL2(L2_I_ERR, "ERROR, state != (MF || TR)!");
|
|
return;
|
|
}
|
|
|
|
CRIT_BEG;
|
|
|
|
l2sc->stat.rx_i++; /* update frame count */
|
|
|
|
nr = GETINR(*(ptr + OFF_INR));
|
|
ns = GETINS(*(ptr + OFF_INS));
|
|
p = GETIP(*(ptr + OFF_INR));
|
|
|
|
i4b_rxd_ack(l2sc, nr); /* last packet ack */
|
|
|
|
if(l2sc->own_busy) /* own receiver busy ? */
|
|
{
|
|
i4b_Dfreembuf(m); /* yes, discard information */
|
|
|
|
if(p == 1) /* P bit == 1 ? */
|
|
{
|
|
i4b_tx_rnr_response(l2sc, p); /* yes, tx RNR */
|
|
l2sc->ack_pend = 0; /* clear ACK pending */
|
|
}
|
|
}
|
|
else /* own receiver ready */
|
|
{
|
|
if(ns == l2sc->vr) /* expected sequence number ? */
|
|
{
|
|
M128INC(l2sc->vr); /* yes, update */
|
|
|
|
l2sc->rej_excpt = 0; /* clr reject exception */
|
|
|
|
m_adj(m, I_HDR_LEN); /* strip i frame header */
|
|
|
|
l2sc->iframe_sent = 0; /* reset i acked already */
|
|
|
|
DL_Data_Ind(l2sc->unit, m); /* pass data up */
|
|
|
|
if(!l2sc->iframe_sent)
|
|
{
|
|
i4b_tx_rr_response(l2sc, p); /* yes, tx RR */
|
|
l2sc->ack_pend = 0; /* clr ACK pending */
|
|
}
|
|
}
|
|
else /* ERROR, sequence number NOT expected */
|
|
{
|
|
i4b_Dfreembuf(m); /* discard information */
|
|
|
|
if(l2sc->rej_excpt == 1) /* already exception ? */
|
|
{
|
|
if(p == 1) /* immediate response ? */
|
|
{
|
|
i4b_tx_rr_response(l2sc, p); /* yes, tx RR */
|
|
l2sc->ack_pend = 0; /* clr ack pend */
|
|
}
|
|
}
|
|
else /* not in exception cond */
|
|
{
|
|
l2sc->rej_excpt = 1; /* set exception */
|
|
i4b_tx_rej_response(l2sc, p); /* tx REJ */
|
|
l2sc->ack_pend = 0; /* clr ack pending */
|
|
}
|
|
}
|
|
}
|
|
|
|
/* sequence number ranges as expected ? */
|
|
|
|
if(i4b_l2_nr_ok(nr, l2sc->va, l2sc->vs))
|
|
{
|
|
if(l2sc->Q921_state == ST_TIMREC)
|
|
{
|
|
l2sc->va = nr;
|
|
|
|
CRIT_END;
|
|
|
|
return;
|
|
}
|
|
|
|
if(l2sc->peer_busy) /* yes, other side busy ? */
|
|
{
|
|
l2sc->va = nr; /* yes, update ack count */
|
|
}
|
|
else /* other side ready */
|
|
{
|
|
if(nr == l2sc->vs) /* count expected ? */
|
|
{
|
|
l2sc->va = nr; /* update ack */
|
|
i4b_T200_stop(l2sc);
|
|
i4b_T203_restart(l2sc);
|
|
}
|
|
else
|
|
{
|
|
if(nr != l2sc->va)
|
|
{
|
|
l2sc->va = nr;
|
|
i4b_T200_restart(l2sc);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
else
|
|
{
|
|
i4b_nr_error_recovery(l2sc); /* sequence error */
|
|
l2sc->Q921_state = ST_AW_EST;
|
|
}
|
|
|
|
CRIT_END;
|
|
}
|
|
|
|
/*---------------------------------------------------------------------------*
|
|
* internal I FRAME QUEUED UP routine (Q.921 03/93 p 61)
|
|
*---------------------------------------------------------------------------*/
|
|
void
|
|
i4b_i_frame_queued_up(l2_softc_t *l2sc)
|
|
{
|
|
struct mbuf *m;
|
|
u_char *ptr;
|
|
CRIT_VAR;
|
|
|
|
CRIT_BEG;
|
|
|
|
if((l2sc->peer_busy) || (l2sc->vs == ((l2sc->va + MAX_K_VALUE) & 127)))
|
|
{
|
|
if(l2sc->peer_busy)
|
|
{
|
|
NDBGL2(L2_I_MSG, "regen IFQUP, cause: peer busy!");
|
|
}
|
|
|
|
if(l2sc->vs == ((l2sc->va + MAX_K_VALUE) & 127))
|
|
{
|
|
NDBGL2(L2_I_MSG, "regen IFQUP, cause: vs=va+k!");
|
|
}
|
|
|
|
/*
|
|
* XXX see: Q.921, page 36, 5.6.1 ".. may retransmit an I
|
|
* frame ...", shall we retransmit the last i frame ?
|
|
*/
|
|
|
|
if(!(IF_QEMPTY(&l2sc->i_queue)))
|
|
{
|
|
NDBGL2(L2_I_MSG, "re-scheduling IFQU call!");
|
|
START_TIMER(l2sc->IFQU_callout, i4b_i_frame_queued_up, l2sc, IFQU_DLY);
|
|
}
|
|
CRIT_END;
|
|
return;
|
|
}
|
|
|
|
IF_DEQUEUE(&l2sc->i_queue, m); /* fetch next frame to tx */
|
|
|
|
if(!m)
|
|
{
|
|
NDBGL2(L2_I_ERR, "ERROR, mbuf NULL after IF_DEQUEUE");
|
|
CRIT_END;
|
|
return;
|
|
}
|
|
|
|
ptr = m->m_data;
|
|
|
|
PUTSAPI(SAPI_CCP, CR_CMD_TO_NT, *(ptr + OFF_SAPI));
|
|
PUTTEI(l2sc->tei, *(ptr + OFF_TEI));
|
|
|
|
*(ptr + OFF_INS) = (l2sc->vs << 1) & 0xfe; /* bit 0 = 0 */
|
|
*(ptr + OFF_INR) = (l2sc->vr << 1) & 0xfe; /* P bit = 0 */
|
|
|
|
l2sc->stat.tx_i++; /* update frame counter */
|
|
|
|
PH_Data_Req(l2sc->unit, m, MBUF_DONTFREE); /* free'd when ack'd ! */
|
|
|
|
l2sc->iframe_sent = 1; /* in case we ack an I frame with another I frame */
|
|
|
|
if(l2sc->ua_num != UA_EMPTY) /* failsafe */
|
|
{
|
|
NDBGL2(L2_I_ERR, "ERROR, l2sc->ua_num: %d != UA_EMPTY", l2sc->ua_num);
|
|
i4b_print_l2var(l2sc);
|
|
i4b_Dfreembuf(l2sc->ua_frame);
|
|
}
|
|
|
|
l2sc->ua_frame = m; /* save unacked frame */
|
|
l2sc->ua_num = l2sc->vs; /* save frame number */
|
|
|
|
M128INC(l2sc->vs);
|
|
|
|
l2sc->ack_pend = 0;
|
|
|
|
CRIT_END;
|
|
|
|
if(l2sc->T200 == TIMER_IDLE)
|
|
{
|
|
i4b_T203_stop(l2sc);
|
|
i4b_T200_start(l2sc);
|
|
}
|
|
}
|
|
|
|
#endif /* NI4BQ921 > 0 */
|