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NetBSD/sys/netisdn/i4b_util.c
martin 5171d409a5 First step to cleanup the hardware driver <-> upper layers interface. 
This now provides slightly more functionality than the FreeBSD layer1-newbus
interface. It was meant to be a simple change to one header and a few
c files, but the change rippled all through various stuff.

To prevent a change to the kernel<->userland interface right now the kernel
is now lying about card types to userland (but who cares). This will be fixed
when the userland interface changes, after layer 3 <-> layer 4 has been
fixed.

Functional changes:

Provide a clean interface for hardware drivers to attach to the upper
layers. This will need another small change in the B-channel handling
when a similar change to the layer 3 <-> layer 4 interface happens.

Avoid passing indices into global arrays of pointers around, instead pass
the pointers itself. Don't code hardware driver types by predefined magic
numbers (think LKM). Prepare for detachable drivers (think pcmcia).

While there remove some sets of function pointers always pointing to the
same function (meant to be the configurable set of D channel protocol
handlers). It is unlikely another supported D-channel protocol will fit into
that (maximal layer interface) abstraction. When we get support for another
protocol, we will need to come up with a workable interface. Besides, the
old implementation was, uhm, strange.
2001-03-24 12:40:29 +00:00

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/*
* 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_util.c - layer 2 utility routines
* -------------------------------------
*
* $Id: i4b_util.c,v 1.3 2001/03/24 12:40:33 martin Exp $
*
* $FreeBSD$
*
* last edit-date: [Fri Jan 5 11:33:47 2001]
*
*---------------------------------------------------------------------------*/
#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_ioctl.h>
#else
#include <netisdn/i4b_debug.h>
#include <netisdn/i4b_ioctl.h>
#endif
#include <netisdn/i4b_global.h>
#include <netisdn/i4b_l1l2.h>
#include <netisdn/i4b_isdnq931.h>
#include <netisdn/i4b_mbuf.h>
#include <netisdn/i4b_l2.h>
#include <netisdn/i4b_l2fsm.h>
/*---------------------------------------------------------------------------*
* routine ESTABLISH DATA LINK (Q.921 03/93 page 83)
*---------------------------------------------------------------------------*/
void
i4b_establish_data_link(l2_softc_t *l2sc)
{
i4b_l1_activate(l2sc);
i4b_clear_exception_conditions(l2sc);
l2sc->RC = 0;
i4b_tx_sabme(l2sc, P1);
i4b_T200_restart(l2sc);
i4b_T203_stop(l2sc);
}
/*---------------------------------------------------------------------------*
* routine CLEAR EXCEPTION CONDITIONS (Q.921 03/93 page 83)
*---------------------------------------------------------------------------*/
void
i4b_clear_exception_conditions(l2_softc_t *l2sc)
{
int s;
s = splnet();
/*XXX -------------------------------------------------------------- */
/*XXX is this really appropriate here or should it moved elsewhere ? */
i4b_Dcleanifq(&l2sc->i_queue);
if(l2sc->ua_num != UA_EMPTY)
{
i4b_Dfreembuf(l2sc->ua_frame);
l2sc->ua_num = UA_EMPTY;
}
/*XXX -------------------------------------------------------------- */
l2sc->peer_busy = 0;
l2sc->rej_excpt = 0;
l2sc->own_busy = 0;
l2sc->ack_pend = 0;
splx(s);
}
/*---------------------------------------------------------------------------*
* routine TRANSMIT ENQUIRE (Q.921 03/93 page 83)
*---------------------------------------------------------------------------*/
void
i4b_transmit_enquire(l2_softc_t *l2sc)
{
if(l2sc->own_busy)
i4b_tx_rnr_command(l2sc, P1);
else
i4b_tx_rr_command(l2sc, P1);
l2sc->ack_pend = 0;
i4b_T200_start(l2sc);
}
/*---------------------------------------------------------------------------*
* routine NR ERROR RECOVERY (Q.921 03/93 page 83)
*---------------------------------------------------------------------------*/
void
i4b_nr_error_recovery(l2_softc_t *l2sc)
{
i4b_mdl_error_ind(l2sc, "i4b_nr_error_recovery", MDL_ERR_J);
i4b_establish_data_link(l2sc);
l2sc->l3initiated = 0;
}
/*---------------------------------------------------------------------------*
* routine ENQUIRY RESPONSE (Q.921 03/93 page 84)
*---------------------------------------------------------------------------*/
void
i4b_enquiry_response(l2_softc_t *l2sc)
{
if(l2sc->own_busy)
i4b_tx_rnr_response(l2sc, F1);
else
i4b_tx_rr_response(l2sc, F1);
l2sc->ack_pend = 0;
}
/*---------------------------------------------------------------------------*
* routine INVOKE RETRANSMISSION (Q.921 03/93 page 84)
*---------------------------------------------------------------------------*/
void
i4b_invoke_retransmission(l2_softc_t *l2sc, int nr)
{
int s;
s = splnet();
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);
}
splx(s);
}
/*---------------------------------------------------------------------------*
* routine ACKNOWLEDGE PENDING (Q.921 03/93 p 70)
*---------------------------------------------------------------------------*/
void
i4b_acknowledge_pending(l2_softc_t *l2sc)
{
if(l2sc->ack_pend)
{
l2sc->ack_pend = 0;
i4b_tx_rr_response(l2sc, F0);
}
}
/*---------------------------------------------------------------------------*
* i4b_print_frame - just print the hex contents of a frame
*---------------------------------------------------------------------------*/
void
i4b_print_frame(int len, u_char *buf)
{
#if DO_I4B_DEBUG
int i;
if (!(i4b_l2_debug & L2_ERROR)) /* XXXXXXXXXXXXXXXXXXXXX */
return;
for(i = 0; i < len; i++)
printf(" 0x%x", buf[i]);
printf("\n");
#endif
}
/*---------------------------------------------------------------------------*
* i4b_print_l2var - print some l2softc vars
*---------------------------------------------------------------------------*/
void
i4b_print_l2var(l2_softc_t *l2sc)
{
NDBGL2(L2_ERROR, "bri %d V(R)=%d, V(S)=%d, V(A)=%d,ACKP=%d,PBSY=%d,OBSY=%d",
l2sc->bri,
l2sc->vr,
l2sc->vs,
l2sc->va,
l2sc->ack_pend,
l2sc->peer_busy,
l2sc->own_busy);
}
/*---------------------------------------------------------------------------*
* 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)
{
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);
}
}
/*---------------------------------------------------------------------------*
* if not already active, activate layer 1
*---------------------------------------------------------------------------*/
void
i4b_l1_activate(l2_softc_t *l2sc)
{
if(l2sc->ph_active == PH_INACTIVE)
{
l2sc->ph_active = PH_ACTIVEPEND;
l2sc->driver->ph_activate_req(l2sc->l1_token);
}
};
/*---------------------------------------------------------------------------*
* 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 */
}
#endif /* NI4BQ921 > 0 */
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