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NetBSD/sys/netisdn/i4b_l2.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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/* $NetBSD: i4b_l2.c,v 1.4 2001/03/24 12:40:31 martin Exp $ */
/*
* 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_l2.c - ISDN layer 2 (Q.921)
* -------------------------------
*
* $Id: i4b_l2.c,v 1.4 2001/03/24 12:40:31 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_l1l2.h>
#include <netisdn/i4b_isdnq931.h>
#include <netisdn/i4b_mbuf.h>
#include <netisdn/i4b_global.h>
#include <netisdn/i4b_l2.h>
#include <netisdn/i4b_l2fsm.h>
int i4b_dl_establish_ind(int);
int i4b_dl_establish_cnf(int);
int i4b_dl_release_ind(int);
int i4b_dl_release_cnf(int);
int i4b_dl_data_ind(int, struct mbuf *);
int i4b_dl_unit_data_ind(int, struct mbuf *);
/* this layers debug level */
unsigned int i4b_l2_debug = L2_DEBUG_DEFAULT;
/*---------------------------------------------------------------------------*
* DL_ESTABLISH_REQ from layer 3
*---------------------------------------------------------------------------*/
int i4b_dl_establish_req(l2_softc_t *l2sc)
{
NDBGL2(L2_PRIM, "bri %d", l2sc->bri);
i4b_l1_activate(l2sc);
i4b_next_l2state(l2sc, EV_DLESTRQ);
return(0);
}
/*---------------------------------------------------------------------------*
* DL_RELEASE_REQ from layer 3
*---------------------------------------------------------------------------*/
int i4b_dl_release_req(l2_softc_t *l2sc)
{
NDBGL2(L2_PRIM, "bri %d", l2sc->bri);
i4b_next_l2state(l2sc, EV_DLRELRQ);
return(0);
}
/*---------------------------------------------------------------------------*
* DL UNIT DATA REQUEST from Layer 3
*---------------------------------------------------------------------------*/
int i4b_dl_unit_data_req(l2_softc_t *l2sc, struct mbuf *m)
{
#ifdef NOTDEF
NDBGL2(L2_PRIM, "bri %d", l2sc->bri);
#endif
return(0);
}
/*---------------------------------------------------------------------------*
* DL DATA REQUEST from Layer 3
*---------------------------------------------------------------------------*/
int i4b_dl_data_req(l2_softc_t *l2sc, struct mbuf *m)
{
switch(l2sc->Q921_state)
{
case ST_AW_EST:
case ST_MULTIFR:
case ST_TIMREC:
if(IF_QFULL(&l2sc->i_queue))
{
NDBGL2(L2_ERROR, "i_queue full!!");
i4b_Dfreembuf(m);
}
else
{
int s;
s = splnet();
IF_ENQUEUE(&l2sc->i_queue, m);
splx(s);
i4b_i_frame_queued_up(l2sc);
}
break;
default:
NDBGL2(L2_ERROR, "bri %d ERROR in state [%s], freeing mbuf", l2sc->bri, i4b_print_l2state(l2sc));
i4b_Dfreembuf(m);
break;
}
return(0);
}
/*---------------------------------------------------------------------------*
* isdn_layer2_activate_ind - link activation/deactivation indication from layer 1
*---------------------------------------------------------------------------*/
int
isdn_layer2_activate_ind(isdn_layer2token t, int event_activate)
{
struct l2_softc *l2sc = (struct l2_softc*)t;
if (event_activate) {
l2sc->ph_active = PH_ACTIVE;
} else {
l2sc->ph_active = PH_INACTIVE;
}
return(0);
}
/*---------------------------------------------------------------------------*
* i4b_l2_unit_init - place layer 2 unit into known state
*---------------------------------------------------------------------------*/
static void
i4b_l2_unit_init(l2_softc_t *l2sc)
{
int s;
s = splnet();
l2sc->Q921_state = ST_TEI_UNAS;
l2sc->tei_valid = TEI_INVALID;
l2sc->vr = 0;
l2sc->vs = 0;
l2sc->va = 0;
l2sc->ack_pend = 0;
l2sc->rej_excpt = 0;
l2sc->peer_busy = 0;
l2sc->own_busy = 0;
l2sc->l3initiated = 0;
l2sc->rxd_CR = 0;
l2sc->rxd_PF = 0;
l2sc->rxd_NR = 0;
l2sc->RC = 0;
l2sc->iframe_sent = 0;
l2sc->postfsmfunc = NULL;
if(l2sc->ua_num != UA_EMPTY)
{
i4b_Dfreembuf(l2sc->ua_frame);
l2sc->ua_num = UA_EMPTY;
l2sc->ua_frame = NULL;
}
i4b_T200_stop(l2sc);
i4b_T202_stop(l2sc);
i4b_T203_stop(l2sc);
splx(s);
}
/*---------------------------------------------------------------------------*
* isdn_layer2_status_ind - status indication upward
*---------------------------------------------------------------------------*/
int
isdn_layer2_status_ind(isdn_layer2token token, int status, int parm)
{
l2_softc_t *l2sc = (l2_softc_t*)token;
int s;
int sendup = 1;
s = splnet();
NDBGL1(L1_PRIM, "bri %d, status=%d, parm=%d", l2sc->bri, status, parm);
switch(status)
{
case STI_ATTACH:
l2sc->i_queue.ifq_maxlen = IQUEUE_MAXLEN;
l2sc->ua_frame = NULL;
bzero(&l2sc->stat, sizeof(lapdstat_t));
i4b_l2_unit_init(l2sc);
/* initialize the callout handles for timeout routines */
callout_init(&l2sc->T200_callout);
callout_init(&l2sc->T202_callout);
callout_init(&l2sc->T203_callout);
callout_init(&l2sc->IFQU_callout);
break;
case STI_L1STAT: /* state of layer 1 */
break;
case STI_PDEACT: /* Timer 4 expired */
/*XXX*/ if((l2sc->Q921_state >= ST_AW_EST) &&
(l2sc->Q921_state <= ST_TIMREC))
{
NDBGL2(L2_ERROR, "bri %d, persistent deactivation!", l2sc->bri);
i4b_l2_unit_init(l2sc);
}
else
{
sendup = 0;
}
break;
case STI_NOL1ACC:
i4b_l2_unit_init(l2sc);
NDBGL2(L2_ERROR, "bri %d, cannot access S0 bus!", l2sc->bri);
break;
default:
NDBGL2(L2_ERROR, "ERROR, bri %d, unknown status message!", l2sc->bri);
break;
}
if(sendup)
i4b_mdl_status_ind(l2sc->bri, status, parm); /* send up to layer 3 */
splx(s);
return(0);
}
/*---------------------------------------------------------------------------*
* MDL_COMMAND_REQ from layer 3
*---------------------------------------------------------------------------*/
int i4b_mdl_command_req(int bri, int command, void * parm)
{
struct l2_softc *sc = (struct l2_softc*)isdn_find_l2_by_bri(bri);
NDBGL2(L2_PRIM, "bri %d, command=%d, parm=%p", bri, command, parm);
switch(command)
{
case CMR_DOPEN:
i4b_l2_unit_init(sc);
/* XXX - enable interrupts */
break;
case CMR_DCLOSE:
/* XXX - disable interrupts */
break;
}
/* XXX - check if we still need this (and the whole function
pointer, when enable/disable is done properly) */
sc->driver->mph_command_req(sc->l1_token, command, parm);
return(0);
}
/*---------------------------------------------------------------------------*
* isdn_layer2_data_ind - process a rx'd frame got from layer 1
*---------------------------------------------------------------------------*/
int
isdn_layer2_data_ind(isdn_layer2token t, struct mbuf *m)
{
l2_softc_t *l2sc = (l2_softc_t*)t;
u_char *ptr = m->m_data;
if ( (*(ptr + OFF_CNTL) & 0x01) == 0 )
{
if(m->m_len < 4) /* 6 oct - 2 chksum oct */
{
l2sc->stat.err_rx_len++;
NDBGL2(L2_ERROR, "ERROR, I-frame < 6 octetts!");
i4b_Dfreembuf(m);
return(0);
}
i4b_rxd_i_frame(l2sc, m);
}
else if ( (*(ptr + OFF_CNTL) & 0x03) == 0x01 )
{
if(m->m_len < 4) /* 6 oct - 2 chksum oct */
{
l2sc->stat.err_rx_len++;
NDBGL2(L2_ERROR, "ERROR, S-frame < 6 octetts!");
i4b_Dfreembuf(m);
return(0);
}
i4b_rxd_s_frame(l2sc, m);
}
else if ( (*(ptr + OFF_CNTL) & 0x03) == 0x03 )
{
if(m->m_len < 3) /* 5 oct - 2 chksum oct */
{
l2sc->stat.err_rx_len++;
NDBGL2(L2_ERROR, "ERROR, U-frame < 5 octetts!");
i4b_Dfreembuf(m);
return(0);
}
i4b_rxd_u_frame(l2sc, m);
}
else
{
l2sc->stat.err_rx_badf++;
NDBGL2(L2_ERROR, "ERROR, bad frame rx'd - ");
i4b_print_frame(m->m_len, m->m_data);
i4b_Dfreembuf(m);
}
return(0);
}
int i4b_l2_channel_get_state(int bri, int b_chanid)
{
l2_softc_t *sc = (l2_softc_t*)isdn_find_l2_by_bri(bri);
return sc->bchan_state[b_chanid];
}
void i4b_l2_channel_set_state(int bri, int b_chanid, int state)
{
l2_softc_t *sc = (l2_softc_t*)isdn_find_l2_by_bri(bri);
sc->bchan_state[b_chanid] = state;
}
#endif /* NI4BQ921 > 0 */
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