FreeBSD-5.3/sys/i4b/layer2/i4b_sframe.c
/*
* Copyright (c) 1997, 2002 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
* ----------------------------------------
* last edit-date: [Sat Mar 9 17:52:06 2002]
*
*---------------------------------------------------------------------------*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD: src/sys/i4b/layer2/i4b_sframe.c,v 1.14 2003/06/10 23:55:01 obrien Exp $");
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/mbuf.h>
#include <sys/socket.h>
#include <net/if.h>
#include <machine/i4b_debug.h>
#include <i4b/include/i4b_l1l2.h>
#include <i4b/include/i4b_mbuf.h>
#include <i4b/layer2/i4b_l2.h>
#include <i4b/layer2/i4b_l2fsm.h>
/*---------------------------------------------------------------------------*
* process s frame
*---------------------------------------------------------------------------*/
void
i4b_rxd_s_frame(int unit, struct mbuf *m)
{
l2_softc_t *l2sc = &l2_softc[unit];
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, unit = %d", l2sc->unit);
m = i4b_build_s_frame(l2sc, CR_CMD_TO_NT, pbit, RR);
PH_Data_Req(l2sc->unit, 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, unit = %d", l2sc->unit);
m = i4b_build_s_frame(l2sc, CR_RSP_TO_NT, fbit, RR);
PH_Data_Req(l2sc->unit, 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, unit = %d", l2sc->unit);
m = i4b_build_s_frame(l2sc, CR_CMD_TO_NT, pbit, RNR);
PH_Data_Req(l2sc->unit, 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, unit = %d", l2sc->unit);
m = i4b_build_s_frame(l2sc, CR_RSP_TO_NT, fbit, RNR);
PH_Data_Req(l2sc->unit, 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, unit = %d", l2sc->unit);
m = i4b_build_s_frame(l2sc, CR_RSP_TO_NT, fbit, REJ);
PH_Data_Req(l2sc->unit, 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);
}