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-rw-r--r--sys/i4b/driver/i4b_isppp.c710
1 files changed, 710 insertions, 0 deletions
diff --git a/sys/i4b/driver/i4b_isppp.c b/sys/i4b/driver/i4b_isppp.c
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+++ b/sys/i4b/driver/i4b_isppp.c
@@ -0,0 +1,710 @@
+/*
+ * Copyright (c) 1997 Joerg Wunsch. All rights reserved.
+ *
+ * Copyright (c) 1997, 1998 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_isppp.c - isdn4bsd kernel SyncPPP driver
+ * --------------------------------------------
+ *
+ * Uses Serge Vakulenko's sppp backend (originally contributed with
+ * the "cx" driver for Cronyx's HDLC-in-hardware device). This driver
+ * is only the glue between sppp and i4b.
+ *
+ * $Id: i4b_isppp.c,v 1.20 1998/12/18 14:20:44 hm Exp $
+ *
+ * last edit-date: [Fri Dec 18 11:47:58 1998]
+ *
+ *---------------------------------------------------------------------------*/
+
+#include "i4bisppp.h"
+#ifdef __FreeBSD__
+#include "sppp.h"
+#endif
+
+#if NI4BISPPP == 0
+# error "You need to define `pseudo-device sppp <N>' with options ISPPP"
+#endif
+
+#include <sys/param.h>
+#include <sys/systm.h>
+#include <sys/mbuf.h>
+#include <sys/socket.h>
+#include <sys/errno.h>
+#include <sys/ioccom.h>
+#include <sys/sockio.h>
+#include <sys/kernel.h>
+#include <sys/protosw.h>
+
+#include <net/if.h>
+#include <net/if_types.h>
+#include <net/netisr.h>
+#include <net/route.h>
+#ifdef __FreeBSD__
+#include <net/if_sppp.h>
+#else
+#include <i4b/sppp/if_sppp.h>
+#endif
+
+#include <netinet/in.h>
+#include <netinet/in_systm.h>
+#include <netinet/in_var.h>
+#include <netinet/ip.h>
+
+#include "bpfilter.h"
+#if NBPFILTER > 0
+#include <sys/time.h>
+#include <net/bpf.h>
+#endif
+
+#ifdef __FreeBSD__
+#include <machine/i4b_ioctl.h>
+#include <machine/i4b_cause.h>
+#else
+#include <i4b/i4b_ioctl.h>
+#include <i4b/i4b_cause.h>
+#endif
+
+#include <i4b/include/i4b_global.h>
+#include <i4b/include/i4b_mbuf.h>
+#include <i4b/include/i4b_l3l4.h>
+
+#include <i4b/layer4/i4b_l4.h>
+
+#ifdef __FreeBSD__
+#define ISPPP_FMT "isp%d: "
+#define ISPPP_ARG(sc) ((sc)->sc_if.if_unit)
+#define PDEVSTATIC static
+#define IFP2UNIT(ifp) (ifp)->if_unit
+
+# if __FreeBSD_version >= 300001
+# define CALLOUT_INIT(chan) callout_handle_init(chan)
+# define TIMEOUT(fun, arg, chan, tick) chan = timeout(fun, arg, tick)
+# define UNTIMEOUT(fun, arg, chan) untimeout(fun, arg, chan)
+# define IOCTL_CMD_T u_long
+# else
+# define CALLOUT_INIT(chan) do {} while(0)
+# define TIMEOUT(fun, arg, chan, tick) timeout(fun, arg, tick)
+# define UNTIMEOUT(fun, arg, chan) untimeout(fun, arg)
+# define IOCTL_CMD_T int
+# endif
+
+#elif defined __NetBSD__ || defined __OpenBSD__
+#define ISPPP_FMT "%s: "
+#define ISPPP_ARG(sc) ((sc)->sc_if.if_xname)
+#define PDEVSTATIC /* not static */
+#define IOCTL_CMD_T u_long
+#define IFP2UNIT(ifp) ((struct i4bisppp_softc *)ifp->if_softc)->sc_unit
+#else
+# error "What system are you using?"
+#endif
+
+#ifdef __FreeBSD__
+PDEVSTATIC void i4bispppattach(void *);
+PSEUDO_SET(i4bispppattach, i4b_isppp);
+#else
+PDEVSTATIC void i4bispppattach __P((void));
+#endif
+
+#define I4BISPPPACCT 1 /* enable accounting messages */
+#define I4BISPPPACCTINTVL 2 /* accounting msg interval in secs */
+#define I4BISPPPDISCDEBUG 1
+
+#define PPP_HDRLEN 4 /* 4 octetts PPP header length */
+
+struct i4bisppp_softc {
+ /*
+ * struct sppp starts with a struct ifnet, but we gotta allocate
+ * more space for it. NB: do not relocate this union, it must
+ * be first in isppp_softc. The tls and tlf hooks below want to
+ * convert a ``struct sppp *'' into a ``struct isppp_softc *''.
+ */
+ union {
+ struct ifnet scu_if;
+ struct sppp scu_sp;
+ } sc_if_un;
+#define sc_if sc_if_un.scu_if
+
+ int sc_state; /* state of the interface */
+
+#ifndef __FreeBSD__
+ int sc_unit; /* unit number for Net/OpenBSD */
+#endif
+
+ call_desc_t *sc_cdp; /* ptr to call descriptor */
+
+#ifdef I4BISPPPACCT
+ int sc_iinb; /* isdn driver # of inbytes */
+ int sc_ioutb; /* isdn driver # of outbytes */
+ int sc_inb; /* # of bytes rx'd */
+ int sc_outb; /* # of bytes tx'd */
+ int sc_linb; /* last # of bytes rx'd */
+ int sc_loutb; /* last # of bytes tx'd */
+ int sc_fn; /* flag, first null acct */
+#endif
+
+#if defined(__FreeBSD_version) && __FreeBSD_version >= 300001
+ struct callout_handle sc_ch;
+#endif
+
+} i4bisppp_softc[NI4BISPPP];
+
+static void i4bisppp_init_linktab(int unit);
+static int i4bisppp_ioctl(struct ifnet *ifp, IOCTL_CMD_T cmd, caddr_t data);
+
+#if 0
+static void i4bisppp_send(struct ifnet *ifp);
+#endif
+
+static void i4bisppp_start(struct ifnet *ifp);
+
+#if 0 /* never used ??? */
+static void i4bisppp_timeout(void *cookie);
+#endif
+
+static void i4bisppp_tls(struct sppp *sp);
+static void i4bisppp_tlf(struct sppp *sp);
+static void i4bisppp_state_changed(struct sppp *sp, int new_state);
+static void i4bisppp_negotiation_complete(struct sppp *sp);
+static void i4bisppp_watchdog(struct ifnet *ifp);
+
+/* initialized by L4 */
+
+static drvr_link_t i4bisppp_drvr_linktab[NI4BISPPP];
+static isdn_link_t *isdn_linktab[NI4BISPPP];
+
+enum i4bisppp_states {
+ ST_IDLE, /* initialized, ready, idle */
+ ST_DIALING, /* dialling out to remote */
+ ST_CONNECTED, /* connected to remote */
+};
+
+/*===========================================================================*
+ * DEVICE DRIVER ROUTINES
+ *===========================================================================*/
+
+/*---------------------------------------------------------------------------*
+ * interface attach routine at kernel boot time
+ *---------------------------------------------------------------------------*/
+PDEVSTATIC void
+#ifdef __FreeBSD__
+i4bispppattach(void *dummy)
+#else
+i4bispppattach(void)
+#endif
+{
+ struct i4bisppp_softc *sc = i4bisppp_softc;
+ int i;
+
+#ifndef HACK_NO_PSEUDO_ATTACH_MSG
+ printf("i4bisppp: %d ISDN SyncPPP device(s) attached\n",
+ NI4BISPPP);
+#endif
+
+ for(i = 0; i < NI4BISPPP; sc++, i++) {
+ i4bisppp_init_linktab(i);
+
+ sc->sc_if.if_softc = sc;
+
+#ifdef __FreeBSD__
+ sc->sc_if.if_name = "isp";
+#if defined(__FreeBSD_version) && __FreeBSD_version < 300001
+ sc->sc_if.if_next = NULL;
+#endif
+ sc->sc_if.if_unit = i;
+#else
+ sprintf(sc->sc_if.if_xname, "isp%d", i);
+ sc->sc_unit = i;
+#endif
+
+ sc->sc_if.if_mtu = PP_MTU;
+ sc->sc_if.if_flags = IFF_SIMPLEX | IFF_POINTOPOINT;
+ sc->sc_if.if_type = IFT_ISDNBASIC;
+ sc->sc_state = ST_IDLE;
+
+ sc->sc_if.if_ioctl = i4bisppp_ioctl;
+
+ /* actually initialized by sppp_attach() */
+ /* sc->sc_if.if_output = sppp_output; */
+
+ sc->sc_if.if_start = i4bisppp_start;
+
+ sc->sc_if.if_hdrlen = 0;
+ sc->sc_if.if_addrlen = 0;
+ sc->sc_if.if_snd.ifq_maxlen = IFQ_MAXLEN;
+
+ sc->sc_if.if_ipackets = 0;
+ sc->sc_if.if_ierrors = 0;
+ sc->sc_if.if_opackets = 0;
+ sc->sc_if.if_oerrors = 0;
+ sc->sc_if.if_collisions = 0;
+ sc->sc_if.if_ibytes = 0;
+ sc->sc_if.if_obytes = 0;
+ sc->sc_if.if_imcasts = 0;
+ sc->sc_if.if_omcasts = 0;
+ sc->sc_if.if_iqdrops = 0;
+ sc->sc_if.if_noproto = 0;
+
+#if I4BISPPPACCT
+ sc->sc_if.if_timer = 0;
+ sc->sc_if.if_watchdog = i4bisppp_watchdog;
+ sc->sc_iinb = 0;
+ sc->sc_ioutb = 0;
+ sc->sc_inb = 0;
+ sc->sc_outb = 0;
+ sc->sc_linb = 0;
+ sc->sc_loutb = 0;
+ sc->sc_fn = 1;
+#endif
+
+ sc->sc_if_un.scu_sp.pp_tls = i4bisppp_tls;
+ sc->sc_if_un.scu_sp.pp_tlf = i4bisppp_tlf;
+ sc->sc_if_un.scu_sp.pp_con = i4bisppp_negotiation_complete;
+ sc->sc_if_un.scu_sp.pp_chg = i4bisppp_state_changed;
+
+ sppp_attach(&sc->sc_if);
+ if_attach(&sc->sc_if);
+
+#if NBPFILTER > 0
+#ifdef __FreeBSD__
+ bpfattach(&sc->sc_if, DLT_PPP, PPP_HDRLEN);
+ CALLOUT_INIT(&sc->sc_ch);
+#endif /* __FreeBSD__ */
+#ifdef __NetBSD__
+ bpfattach(&sc->sc_if.if_bpf, &sc->sc_if, DLT_PPP, sizeof(u_int));
+#endif
+#endif
+ }
+}
+
+/*---------------------------------------------------------------------------*
+ * process ioctl
+ *---------------------------------------------------------------------------*/
+static int
+i4bisppp_ioctl(struct ifnet *ifp, IOCTL_CMD_T cmd, caddr_t data)
+{
+ struct i4bisppp_softc *sc = ifp->if_softc;
+#if 0
+ struct sppp *sp = (struct sppp *)sc;
+ struct ifaddr *ifa = (struct ifaddr *) data;
+ struct ifreq *ifr = (struct ifreq *) data;
+#endif
+
+ int error;
+
+ error = sppp_ioctl(&sc->sc_if, cmd, data);
+ if (error)
+ return error;
+
+ switch(cmd) {
+ case SIOCSIFFLAGS:
+#if 0 /* never used ??? */
+ x = splimp();
+ if ((ifp->if_flags & IFF_UP) == 0)
+ UNTIMEOUT(i4bisppp_timeout, (void *)sp, sc->sc_ch);
+ splx(x);
+#endif
+ break;
+ }
+
+ return 0;
+}
+
+/*---------------------------------------------------------------------------*
+ * start output to ISDN B-channel
+ *---------------------------------------------------------------------------*/
+static void
+i4bisppp_start(struct ifnet *ifp)
+{
+ struct i4bisppp_softc *sc = ifp->if_softc;
+ struct mbuf *m;
+ int s;
+ int unit = IFP2UNIT(ifp);
+
+ if (sppp_isempty(ifp))
+ return;
+
+ if(sc->sc_state != ST_CONNECTED)
+ return;
+
+ s = splimp();
+ /*ifp->if_flags |= IFF_OACTIVE; - need to clear this somewhere */
+ splx(s);
+
+ while ((m = sppp_dequeue(&sc->sc_if)) != NULL)
+ {
+
+#if NBPFILTER > 0
+#ifdef __FreeBSD__
+ if (ifp->if_bpf)
+ bpf_mtap(ifp, m);
+#endif /* __FreeBSD__ */
+
+#ifdef __NetBSD__
+ if (ifp->if_bpf)
+ bpf_mtap(ifp->if_bpf, m);
+#endif
+#endif /* NBPFILTER > 0 */
+
+ microtime(&ifp->if_lastchange);
+
+ IF_ENQUEUE(isdn_linktab[unit]->tx_queue, m);
+
+ sc->sc_if.if_obytes += m->m_pkthdr.len;
+ sc->sc_outb += m->m_pkthdr.len;
+ sc->sc_if.if_opackets++;
+ }
+ isdn_linktab[unit]->bch_tx_start(isdn_linktab[unit]->unit,
+ isdn_linktab[unit]->channel);
+}
+
+#ifdef I4BISPPPACCT
+/*---------------------------------------------------------------------------*
+ * watchdog routine
+ *---------------------------------------------------------------------------*/
+static void
+i4bisppp_watchdog(struct ifnet *ifp)
+{
+ struct i4bisppp_softc *sc = ifp->if_softc;
+ int unit = IFP2UNIT(ifp);
+ bchan_statistics_t bs;
+
+ (*isdn_linktab[unit]->bch_stat)
+ (isdn_linktab[unit]->unit, isdn_linktab[unit]->channel, &bs);
+
+ sc->sc_ioutb += bs.outbytes;
+ sc->sc_iinb += bs.inbytes;
+
+ if((sc->sc_iinb != sc->sc_linb) || (sc->sc_ioutb != sc->sc_loutb) || sc->sc_fn)
+ {
+ int ri = (sc->sc_iinb - sc->sc_linb)/I4BISPPPACCTINTVL;
+ int ro = (sc->sc_ioutb - sc->sc_loutb)/I4BISPPPACCTINTVL;
+
+ if((sc->sc_iinb == sc->sc_linb) && (sc->sc_ioutb == sc->sc_loutb))
+ sc->sc_fn = 0;
+ else
+ sc->sc_fn = 1;
+
+ sc->sc_linb = sc->sc_iinb;
+ sc->sc_loutb = sc->sc_ioutb;
+
+ i4b_l4_accounting(BDRV_ISPPP, unit, ACCT_DURING,
+ sc->sc_ioutb, sc->sc_iinb, ro, ri, sc->sc_outb, sc->sc_inb);
+ }
+ sc->sc_if.if_timer = I4BISPPPACCTINTVL;
+
+#if 0 /* old stuff, keep it around */
+ printf(ISPPP_FMT "transmit timeout\n", ISPPP_ARG(sc));
+ i4bisppp_start(ifp);
+#endif
+}
+#endif /* I4BISPPPACCT */
+
+/*
+ *===========================================================================*
+ * SyncPPP layer interface routines
+ *===========================================================================*
+ */
+
+#if 0 /* never used ??? */
+/*---------------------------------------------------------------------------*
+ * just an alias for i4bisppp_tls, but of type timeout_t
+ *---------------------------------------------------------------------------*/
+static void
+i4bisppp_timeout(void *cookie)
+{
+ i4bisppp_tls((struct sppp *)cookie);
+}
+#endif
+
+/*---------------------------------------------------------------------------*
+ * PPP this-layer-started action
+ *---------------------------------------------------------------------------*
+ */
+static void
+i4bisppp_tls(struct sppp *sp)
+{
+ struct i4bisppp_softc *sc = (struct i4bisppp_softc *)sp;
+ struct ifnet *ifp = (struct ifnet *)sp;
+
+ if(sc->sc_state == ST_CONNECTED)
+ return;
+
+ i4b_l4_dialout(BDRV_ISPPP, IFP2UNIT(ifp));
+}
+
+/*---------------------------------------------------------------------------*
+ * PPP this-layer-finished action
+ *---------------------------------------------------------------------------*
+ */
+static void
+i4bisppp_tlf(struct sppp *sp)
+{
+ struct i4bisppp_softc *sc = (struct i4bisppp_softc *)sp;
+/* call_desc_t *cd = sc->sc_cdp; */
+ struct ifnet *ifp = (struct ifnet *)sp;
+
+ if(sc->sc_state != ST_CONNECTED)
+ return;
+
+#if 0 /* never used ??? */
+ UNTIMEOUT(i4bisppp_timeout, (void *)sp, sc->sc_ch);
+#endif
+
+ i4b_l4_drvrdisc(BDRV_ISPPP, IFP2UNIT(ifp));
+}
+/*---------------------------------------------------------------------------*
+ * PPP interface phase change
+ *---------------------------------------------------------------------------*
+ */
+static void
+i4bisppp_state_changed(struct sppp *sp, int new_state)
+{
+ struct i4bisppp_softc *sc = (struct i4bisppp_softc *)sp;
+
+ i4b_l4_ifstate_changed(sc->sc_cdp, new_state);
+}
+
+/*---------------------------------------------------------------------------*
+ * PPP control protocol negotiation complete (run ip-up script now)
+ *---------------------------------------------------------------------------*
+ */
+static void
+i4bisppp_negotiation_complete(struct sppp *sp)
+{
+ struct i4bisppp_softc *sc = (struct i4bisppp_softc *)sp;
+
+ i4b_l4_negcomplete(sc->sc_cdp);
+}
+
+/*===========================================================================*
+ * ISDN INTERFACE ROUTINES
+ *===========================================================================*/
+
+/*---------------------------------------------------------------------------*
+ * this routine is called from L4 handler at connect time
+ *---------------------------------------------------------------------------*/
+static void
+i4bisppp_connect(int unit, void *cdp)
+{
+ struct i4bisppp_softc *sc = &i4bisppp_softc[unit];
+ struct sppp *sp = &sc->sc_if_un.scu_sp;
+ int s = splimp();
+
+ sc->sc_cdp = (call_desc_t *)cdp;
+ sc->sc_state = ST_CONNECTED;
+
+#if I4BISPPPACCT
+ sc->sc_iinb = 0;
+ sc->sc_ioutb = 0;
+ sc->sc_inb = 0;
+ sc->sc_outb = 0;
+ sc->sc_linb = 0;
+ sc->sc_loutb = 0;
+ sc->sc_if.if_timer = I4BISPPPACCTINTVL;
+#endif
+
+#if 0 /* never used ??? */
+ UNTIMEOUT(i4bisppp_timeout, (void *)sp, sc->sc_ch);
+#endif
+
+ sp->pp_up(sp); /* tell PPP we are ready */
+
+ splx(s);
+}
+
+/*---------------------------------------------------------------------------*
+ * this routine is called from L4 handler at disconnect time
+ *---------------------------------------------------------------------------*/
+static void
+i4bisppp_disconnect(int unit, void *cdp)
+{
+ call_desc_t *cd = (call_desc_t *)cdp;
+ struct i4bisppp_softc *sc = &i4bisppp_softc[unit];
+ struct sppp *sp = &sc->sc_if_un.scu_sp;
+
+ int s = splimp();
+
+ /* new stuff to check that the active channel is being closed */
+ if (cd != sc->sc_cdp)
+ {
+#ifdef I4BISPPPDISCDEBUG
+ printf("i4bisppp_disconnect: isppp%d channel%d not active\n",
+ cd->driver_unit, cd->channelid);
+#endif
+ splx(s);
+ return;
+ }
+
+#if I4BISPPPACCT
+ sc->sc_if.if_timer = 0;
+#endif
+
+ i4b_l4_accounting(BDRV_ISPPP, unit, ACCT_FINAL,
+ sc->sc_ioutb, sc->sc_iinb, 0, 0, sc->sc_outb, sc->sc_inb);
+
+ if (sc->sc_state == ST_CONNECTED)
+ {
+#if 0 /* never used ??? */
+ UNTIMEOUT(i4bisppp_timeout, (void *)sp, sc->sc_ch);
+#endif
+ sc->sc_cdp = (call_desc_t *)0;
+ /* do thhis here because pp_down calls i4bisppp_tlf */
+ sc->sc_state = ST_IDLE;
+ sp->pp_down(sp); /* tell PPP we have hung up */
+ }
+
+ splx(s);
+}
+
+/*---------------------------------------------------------------------------*
+ * this routine is used to give a feedback from userland demon
+ * in case of dial problems
+ *---------------------------------------------------------------------------*/
+static void
+i4bisppp_dialresponse(int unit, int status)
+{
+/* struct i4bisppp_softc *sc = &i4bisppp_softc[unit]; */
+}
+
+/*---------------------------------------------------------------------------*
+ * interface up/down
+ *---------------------------------------------------------------------------*/
+static void
+i4bisppp_updown(int unit, int updown)
+{
+ /* could probably do something useful here */
+}
+
+/*---------------------------------------------------------------------------*
+ * this routine is called from the HSCX interrupt handler
+ * when a new frame (mbuf) has been received and was put on
+ * the rx queue.
+ *---------------------------------------------------------------------------*/
+static void
+i4bisppp_rx_data_rdy(int unit)
+{
+ struct i4bisppp_softc *sc = &i4bisppp_softc[unit];
+ struct mbuf *m;
+ int s;
+
+ if((m = *isdn_linktab[unit]->rx_mbuf) == NULL)
+ return;
+
+ m->m_pkthdr.rcvif = &sc->sc_if;
+ m->m_pkthdr.len = m->m_len;
+
+ microtime(&sc->sc_if.if_lastchange);
+
+ sc->sc_if.if_ipackets++;
+ sc->sc_if.if_ibytes += m->m_pkthdr.len;
+
+#if I4BISPPPACCT
+ sc->sc_inb += m->m_pkthdr.len;
+#endif
+
+#ifdef I4BISPPPDEBUG
+ printf("i4bisppp_rx_data_ready: received packet!\n");
+#endif
+
+#if NBPFILTER > 0
+
+#ifdef __FreeBSD__
+ if(sc->sc_if.if_bpf)
+ bpf_mtap(&sc->sc_if, m);
+#endif /* __FreeBSD__ */
+
+#ifdef __NetBSD__
+ if(sc->sc_if.if_bpf)
+ bpf_mtap(sc->sc_if.if_bpf, m);
+#endif
+
+#endif /* NBPFILTER > 0 */
+
+ s = splimp();
+
+ sppp_input(&sc->sc_if, m);
+
+ splx(s);
+}
+
+/*---------------------------------------------------------------------------*
+ * this routine is called from the HSCX interrupt handler
+ * when the last frame has been sent out and there is no
+ * further frame (mbuf) in the tx queue.
+ *---------------------------------------------------------------------------*/
+static void
+i4bisppp_tx_queue_empty(int unit)
+{
+ i4bisppp_start(&i4bisppp_softc[unit].sc_if);
+}
+
+/*---------------------------------------------------------------------------*
+ * this routine is called from the HSCX interrupt handler
+ * each time a packet is received or transmitted. It should
+ * be used to implement an activity timeout mechanism.
+ *---------------------------------------------------------------------------*/
+static void
+i4bisppp_activity(int unit, int rxtx)
+{
+ i4bisppp_softc[unit].sc_cdp->last_active_time = SECOND;
+}
+
+/*---------------------------------------------------------------------------*
+ * return this drivers linktab address
+ *---------------------------------------------------------------------------*/
+drvr_link_t *
+i4bisppp_ret_linktab(int unit)
+{
+ return(&i4bisppp_drvr_linktab[unit]);
+}
+
+/*---------------------------------------------------------------------------*
+ * setup the isdn_linktab for this driver
+ *---------------------------------------------------------------------------*/
+void
+i4bisppp_set_linktab(int unit, isdn_link_t *ilt)
+{
+ isdn_linktab[unit] = ilt;
+}
+
+/*---------------------------------------------------------------------------*
+ * initialize this drivers linktab
+ *---------------------------------------------------------------------------*/
+static void
+i4bisppp_init_linktab(int unit)
+{
+ i4bisppp_drvr_linktab[unit].unit = unit;
+ i4bisppp_drvr_linktab[unit].bch_rx_data_ready = i4bisppp_rx_data_rdy;
+ i4bisppp_drvr_linktab[unit].bch_tx_queue_empty = i4bisppp_tx_queue_empty;
+ i4bisppp_drvr_linktab[unit].bch_activity = i4bisppp_activity;
+ i4bisppp_drvr_linktab[unit].line_connected = i4bisppp_connect;
+ i4bisppp_drvr_linktab[unit].line_disconnected = i4bisppp_disconnect;
+ i4bisppp_drvr_linktab[unit].dial_response = i4bisppp_dialresponse;
+ i4bisppp_drvr_linktab[unit].updown_ind = i4bisppp_updown;
+}
+
+/*===========================================================================*/
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