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NetBSD/sys/netisdn/i4b_sframe.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_sframe.c - s frame handling routines
* ----------------------------------------
*
* $Id: i4b_sframe.c,v 1.2 2001/03/24 12:40:32 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_l2.h>
#include <netisdn/i4b_l2fsm.h>
/*---------------------------------------------------------------------------*
* process s frame
*---------------------------------------------------------------------------*/
void
i4b_rxd_s_frame(l2_softc_t *l2sc, struct mbuf *m)
{
u_char *ptr = m->m_data;
if(!((l2sc->tei_valid == TEI_VALID) &&
(l2sc->tei == GETTEI(*(ptr+OFF_TEI)))))
{
i4b_Dfreembuf(m);
return;
}
l2sc->rxd_CR = GETCR(*(ptr + OFF_SAPI));
l2sc->rxd_PF = GETSPF(*(ptr + OFF_SNR));
l2sc->rxd_NR = GETSNR(*(ptr + OFF_SNR));
i4b_rxd_ack(l2sc, l2sc->rxd_NR);
switch(*(ptr + OFF_SRCR))
{
case RR:
l2sc->stat.rx_rr++; /* update statistics */
NDBGL2(L2_S_MSG, "rx'd RR, N(R) = %d", l2sc->rxd_NR);
i4b_next_l2state(l2sc, EV_RXRR);
break;
case RNR:
l2sc->stat.rx_rnr++; /* update statistics */
NDBGL2(L2_S_MSG, "rx'd RNR, N(R) = %d", l2sc->rxd_NR);
i4b_next_l2state(l2sc, EV_RXRNR);
break;
case REJ:
l2sc->stat.rx_rej++; /* update statistics */
NDBGL2(L2_S_MSG, "rx'd REJ, N(R) = %d", l2sc->rxd_NR);
i4b_next_l2state(l2sc, EV_RXREJ);
break;
default:
l2sc->stat.err_rx_bads++; /* update statistics */
NDBGL2(L2_S_ERR, "ERROR, unknown code, frame = ");
i4b_print_frame(m->m_len, m->m_data);
break;
}
i4b_Dfreembuf(m);
}
/*---------------------------------------------------------------------------*
* transmit RR command
*---------------------------------------------------------------------------*/
void
i4b_tx_rr_command(l2_softc_t *l2sc, pbit_t pbit)
{
struct mbuf *m;
NDBGL2(L2_S_MSG, "tx RR, bri = %d", l2sc->bri);
m = i4b_build_s_frame(l2sc, CR_CMD_TO_NT, pbit, RR);
l2sc->driver->ph_data_req(l2sc->l1_token, m, MBUF_FREE);
l2sc->stat.tx_rr++; /* update statistics */
}
/*---------------------------------------------------------------------------*
* transmit RR response
*---------------------------------------------------------------------------*/
void
i4b_tx_rr_response(l2_softc_t *l2sc, fbit_t fbit)
{
struct mbuf *m;
NDBGL2(L2_S_MSG, "tx RR, bri = %d", l2sc->bri);
m = i4b_build_s_frame(l2sc, CR_RSP_TO_NT, fbit, RR);
l2sc->driver->ph_data_req(l2sc->l1_token, m, MBUF_FREE);
l2sc->stat.tx_rr++; /* update statistics */
}
/*---------------------------------------------------------------------------*
* transmit RNR command
*---------------------------------------------------------------------------*/
void
i4b_tx_rnr_command(l2_softc_t *l2sc, pbit_t pbit)
{
struct mbuf *m;
NDBGL2(L2_S_MSG, "tx RNR, bri = %d", l2sc->bri);
m = i4b_build_s_frame(l2sc, CR_CMD_TO_NT, pbit, RNR);
l2sc->driver->ph_data_req(l2sc->l1_token, m, MBUF_FREE);
l2sc->stat.tx_rnr++; /* update statistics */
}
/*---------------------------------------------------------------------------*
* transmit RNR response
*---------------------------------------------------------------------------*/
void
i4b_tx_rnr_response(l2_softc_t *l2sc, fbit_t fbit)
{
struct mbuf *m;
NDBGL2(L2_S_MSG, "tx RNR, bri = %d", l2sc->bri);
m = i4b_build_s_frame(l2sc, CR_RSP_TO_NT, fbit, RNR);
l2sc->driver->ph_data_req(l2sc->l1_token, m, MBUF_FREE);
l2sc->stat.tx_rnr++; /* update statistics */
}
/*---------------------------------------------------------------------------*
* transmit REJ response
*---------------------------------------------------------------------------*/
void
i4b_tx_rej_response(l2_softc_t *l2sc, fbit_t fbit)
{
struct mbuf *m;
NDBGL2(L2_S_MSG, "tx REJ, bri = %d", l2sc->bri);
m = i4b_build_s_frame(l2sc, CR_RSP_TO_NT, fbit, REJ);
l2sc->driver->ph_data_req(l2sc->l1_token, m, MBUF_FREE);
l2sc->stat.tx_rej++; /* update statistics */
}
/*---------------------------------------------------------------------------*
* build S-frame for sending
*---------------------------------------------------------------------------*/
struct mbuf *
i4b_build_s_frame(l2_softc_t *l2sc, crbit_to_nt_t crbit, pbit_t pbit, u_char type)
{
struct mbuf *m;
if((m = i4b_Dgetmbuf(S_FRAME_LEN)) == NULL)
return(NULL);
PUTSAPI(SAPI_CCP, crbit, m->m_data[OFF_SAPI]);
PUTTEI(l2sc->tei, m->m_data[OFF_TEI]);
m->m_data[OFF_SRCR] = type;
m->m_data[OFF_SNR] = (l2sc->vr << 1) | (pbit & 0x01);
return(m);
}
#endif /* NI4BQ921 > 0 */
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