0bc69b6498
and move them in their proper places. Move the BRI registry from layer 2 (duh!) to layer 4, so active cards (which don't have layer 3 or layer 2 in their driver). Remove all remaining hard coded controller and driver types. Remove any arbitrary hard coded limits, at least those that show up in the internal API. This fixes PR 15950.
293 lines
7.2 KiB
C
293 lines
7.2 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 1.5 2002/03/24 20:35:57 martin Exp $
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*
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* $FreeBSD$
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*
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* last edit-date: [Fri Jan 5 11:33:47 2001]
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*
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*---------------------------------------------------------------------------*/
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#include <sys/cdefs.h>
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__KERNEL_RCSID(0, "$NetBSD: i4b_iframe.c,v 1.5 2002/03/24 20:35:57 martin Exp $");
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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 <netisdn/i4b_debug.h>
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#include <netisdn/i4b_ioctl.h>
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#include <netisdn/i4b_trace.h>
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#endif
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#include <netisdn/i4b_global.h>
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#include <netisdn/i4b_l2.h>
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#include <netisdn/i4b_l1l2.h>
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#include <netisdn/i4b_isdnq931.h>
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#include <netisdn/i4b_mbuf.h>
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#include <netisdn/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(l2_softc_t *l2sc, struct mbuf *m)
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{
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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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int s;
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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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s = splnet();
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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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i4b_dl_data_ind(l2sc->bri, 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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splx(s);
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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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splx(s);
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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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int s;
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s = splnet();
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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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splx(s);
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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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splx(s);
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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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l2sc->driver->ph_data_req(l2sc->l1_token, 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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splx(s);
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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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