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