freebsd-dev/sys/i4b/driver/i4b_bsdi_ibc.c
Jonathan Lemon df5e198723 Lock down the network interface queues. The queue mutex must be obtained
before adding/removing packets from the queue.  Also, the if_obytes and
if_omcasts fields should only be manipulated under protection of the mutex.

IF_ENQUEUE, IF_PREPEND, and IF_DEQUEUE perform all necessary locking on
the queue.  An IF_LOCK macro is provided, as well as the old (mutex-less)
versions of the macros in the form _IF_ENQUEUE, _IF_QFULL, for code which
needs them, but their use is discouraged.

Two new macros are introduced: IF_DRAIN() to drain a queue, and IF_HANDOFF,
which takes care of locking/enqueue, and also statistics updating/start
if necessary.
2000-11-25 07:35:38 +00:00

563 lines
16 KiB
C

/*
* Copyright (c) 1998, 1999 Bert Driehuis. 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_bsdi_ibc.c - isdn4bsd kernel BSD/OS point to point driver
* -------------------------------------------------------------
*
* $Id: i4b_bsdi_ibc.c,v 1.3 2000/08/21 07:21:07 hm Exp $
*
* $FreeBSD$
*
* last edit-date: [Tue Dec 14 21:55:24 1999]
*
*---------------------------------------------------------------------------*/
#include "ibc.h"
#if NIBC > 0
#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/ttycom.h>
#include <sys/sockio.h>
#include <sys/kernel.h>
#include <sys/protosw.h>
#include <net/if.h>
#include <net/if_types.h>
#include <net/if_p2p.h>
#include <net/netisr.h>
#include <net/route.h>
#include <netinet/in.h>
#include <netinet/in_systm.h>
#include <netinet/in_var.h>
#include <netinet/ip.h>
#include <i4b/i4b_ioctl.h>
#include <i4b/i4b_cause.h>
#include <i4b/include/i4b_global.h>
#include <i4b/include/i4b_mbuf.h>
#include <i4b/include/i4b_l3l4.h>
#include <i4b/layer4/i4b_l4.h>
#define IFP2UNIT(ifp) (ifp)->if_unit
#define IOCTL_CMD_T u_long
void ibcattach(void *);
#define IBCACCT 1 /* enable accounting messages */
#define IBCACCTINTVL 2 /* accounting msg interval in secs */
#define PPP_HDRLEN 4 /* 4 octets PPP header length */
struct ibc_softc {
struct p2pcom sc_p2pcom;
int sc_state; /* state of the interface */
call_desc_t *sc_cdp; /* ptr to call descriptor */
#ifdef IBCACCT
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
} ibc_softc[NIBC];
static void ibc_init_linktab(int unit);
static int ibc_start(struct ifnet *ifp);
static int ibc_watchdog(int unit);
static int ibc_mdmctl(struct p2pcom *pp, int flag);
static int ibc_getmdm(struct p2pcom *pp, caddr_t arg);
/* initialized by L4 */
static drvr_link_t ibc_drvr_linktab[NIBC];
static isdn_link_t *isdn_ibc_lt[NIBC];
enum ibc_states {
ST_IDLE, /* initialized, ready, idle */
ST_DIALING, /* dialling out to remote */
ST_CONNECTED, /* connected to remote */
};
int ibcdebug = 0; /* Use bpatch to set this for debug printf's */
#define DBG(x) if (ibcdebug) printf x
/*===========================================================================*
* DEVICE DRIVER ROUTINES
*===========================================================================*/
/*---------------------------------------------------------------------------*
* interface attach routine at kernel boot time
*---------------------------------------------------------------------------*/
void
ibcattach(void *dummy)
{
struct ibc_softc *sc = ibc_softc;
struct ifnet *ifp;
int i;
#ifndef HACK_NO_PSEUDO_ATTACH_MSG
printf("ibc: %d ISDN ibc device(s) attached\n",
NIBC);
#endif
for(i = 0; i < NIBC; sc++, i++) {
ibc_init_linktab(i);
sc->sc_p2pcom.p2p_mdmctl = ibc_mdmctl;
sc->sc_p2pcom.p2p_getmdm = ibc_getmdm;
sc->sc_state = ST_IDLE;
ifp = &sc->sc_p2pcom.p2p_if;
ifp->if_name = "ibc";
ifp->if_next = NULL;
ifp->if_unit = i;
ifp->if_mtu = 1500 /*XXX*/;
ifp->if_baudrate = 64000;
ifp->if_flags = IFF_SIMPLEX | IFF_POINTOPOINT;
ifp->if_type = IFT_ISDNBASIC;
ifp->if_start = ibc_start;
ifp->if_output = 0;
ifp->if_ioctl = p2p_ioctl;
ifp->if_hdrlen = 0;
ifp->if_addrlen = 0;
ifp->if_snd.ifq_maxlen = IFQ_MAXLEN;
ifp->if_ipackets = 0;
ifp->if_ierrors = 0;
ifp->if_opackets = 0;
ifp->if_oerrors = 0;
ifp->if_collisions = 0;
ifp->if_ibytes = 0;
ifp->if_obytes = 0;
ifp->if_imcasts = 0;
ifp->if_omcasts = 0;
ifp->if_iqdrops = 0;
ifp->if_noproto = 0;
#if IBCACCT
ifp->if_timer = 0;
ifp->if_watchdog = ibc_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
#if defined(__FreeBSD_version) && ((__FreeBSD_version >= 500009) || (410000 <= __FreeBSD_version && __FreeBSD_version < 500000))
ether_ifattach(ifp, 0);
#else
if_attach(ifp);
#endif
p2p_attach(&sc->sc_p2pcom);
}
}
static struct mbuf *
p2p_dequeue(struct p2pcom *pp)
{
struct mbuf *m;
IF_DEQUEUE(&pp->p2p_isnd, m);
if (m == 0)
IF_DEQUEUE(&pp->p2p_if.if_snd, m);
return m;
}
/*---------------------------------------------------------------------------*
* start output to ISDN B-channel
*---------------------------------------------------------------------------*/
static int
ibc_start(struct ifnet *ifp)
{
int unit = IFP2UNIT(ifp);
struct ibc_softc *sc = (struct ibc_softc *)&ibc_softc[unit];
struct p2pcom *pp = &sc->sc_p2pcom;
struct mbuf *m;
int s;
if(sc->sc_state != ST_CONNECTED) {
DBG(("ibc%d: ibc_start called with sc_state=%d\n",
unit, sc->sc_state));
return 0;
}
s = SPLI4B();
IF_LOCK(isdn_ibc_lt[unit]->tx_queue);
if (_IF_QFULL(isdn_ibc_lt[unit]->tx_queue)) {
IF_UNLOCK(isdn_ibc_lt[unit]->tx_queue);
splx(s);
return 0;
}
m = p2p_dequeue(pp);
if (m == NULL) {
IF_UNLOCK(isdn_ibc_lt[unit]->tx_queue);
splx(s);
return 0;
}
do {
microtime(&ifp->if_lastchange);
ifp->if_obytes += m->m_pkthdr.len;
sc->sc_outb += m->m_pkthdr.len;
_IF_ENQUEUE(isdn_ibc_lt[unit]->tx_queue, m);
ifp->if_opackets++;
} while (!_IF_QFULL(isdn_ibc_lt[unit]->tx_queue) &&
(m = p2p_dequeue(pp)) != NULL);
IF_UNLOCK(isdn_ibc_lt[unit]->tx_queue);
isdn_ibc_lt[unit]->bch_tx_start(isdn_ibc_lt[unit]->unit,
isdn_ibc_lt[unit]->channel);
splx(s);
return 0;
}
#ifdef IBCACCT
/*---------------------------------------------------------------------------*
* watchdog routine
*---------------------------------------------------------------------------*/
static int
ibc_watchdog(int unit)
{
struct ibc_softc *sc = &ibc_softc[unit];
struct ifnet *ifp = &sc->sc_p2pcom.p2p_if;
bchan_statistics_t bs;
(*isdn_ibc_lt[unit]->bch_stat)
(isdn_ibc_lt[unit]->unit, isdn_ibc_lt[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)/IBCACCTINTVL;
int ro = (sc->sc_ioutb - sc->sc_loutb)/IBCACCTINTVL;
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_IBC, unit, ACCT_DURING,
sc->sc_ioutb, sc->sc_iinb, ro, ri, sc->sc_outb, sc->sc_inb);
}
ifp->if_timer = IBCACCTINTVL;
return 0;
}
#endif /* IBCACCT */
/*
*===========================================================================*
* P2P layer interface routines
*===========================================================================*
*/
#if 0
/*---------------------------------------------------------------------------*
* PPP interface phase change
*---------------------------------------------------------------------------*
*/
static void
ibc_state_changed(struct sppp *sp, int new_state)
{
struct ibc_softc *sc = (struct ibc_softc *)sp;
i4b_l4_ifstate_changed(sc->sc_cdp, new_state);
}
/*---------------------------------------------------------------------------*
* PPP control protocol negotiation complete (run ip-up script now)
*---------------------------------------------------------------------------*
*/
static void
ibc_negotiation_complete(struct sppp *sp)
{
struct ibc_softc *sc = (struct ibc_softc *)sp;
i4b_l4_negcomplete(sc->sc_cdp);
}
#endif
/*===========================================================================*
* ISDN INTERFACE ROUTINES
*===========================================================================*/
/*---------------------------------------------------------------------------*
* this routine is called from L4 handler at connect time
*---------------------------------------------------------------------------*/
static void
ibc_connect(int unit, void *cdp)
{
struct ibc_softc *sc = &ibc_softc[unit];
struct ifnet *ifp = &sc->sc_p2pcom.p2p_if;
int s;
DBG(("ibc%d: ibc_connect\n", unit));
s = splimp();
sc->sc_cdp = (call_desc_t *)cdp;
sc->sc_state = ST_CONNECTED;
#if IBCACCT
sc->sc_iinb = 0;
sc->sc_ioutb = 0;
sc->sc_inb = 0;
sc->sc_outb = 0;
sc->sc_linb = 0;
sc->sc_loutb = 0;
ifp->if_timer = IBCACCTINTVL;
#endif
splx(s);
if (sc->sc_p2pcom.p2p_modem)
(*sc->sc_p2pcom.p2p_modem)(&sc->sc_p2pcom, 1);
/* This is a lie... PPP is just starting to negociate :-) */
i4b_l4_negcomplete(sc->sc_cdp);
}
/*---------------------------------------------------------------------------*
* this routine is called from L4 handler at disconnect time
*---------------------------------------------------------------------------*/
static void
ibc_disconnect(int unit, void *cdp)
{
call_desc_t *cd = (call_desc_t *)cdp;
struct ibc_softc *sc = &ibc_softc[unit];
struct ifnet *ifp = &sc->sc_p2pcom.p2p_if;
int s;
DBG(("ibc%d: ibc_disconnect\n", unit));
s = splimp();
/* new stuff to check that the active channel is being closed */
if (cd != sc->sc_cdp)
{
DBG(("ibc_disconnect: ibc%d channel%d not active\n",
cd->driver_unit, cd->channelid));
splx(s);
return;
}
#if IBCACCT
ifp->if_timer = 0;
#endif
i4b_l4_accounting(BDRV_IBC, unit, ACCT_FINAL,
sc->sc_ioutb, sc->sc_iinb, 0, 0, sc->sc_outb, sc->sc_inb);
if (sc->sc_state == ST_CONNECTED)
{
sc->sc_cdp = (call_desc_t *)0;
sc->sc_state = ST_IDLE;
if (sc->sc_p2pcom.p2p_modem)
(*sc->sc_p2pcom.p2p_modem)(&sc->sc_p2pcom, 0);
}
splx(s);
}
/*---------------------------------------------------------------------------*
* this routine is used to give a feedback from userland demon
* in case of dial problems
*---------------------------------------------------------------------------*/
static void
ibc_dialresponse(int unit, int status)
{
DBG(("ibc%d: ibc_dialresponse %d\n", unit, status));
/* struct ibc_softc *sc = &ibc_softc[unit]; */
}
/*---------------------------------------------------------------------------*
* interface up/down
*---------------------------------------------------------------------------*/
static void
ibc_updown(int unit, int updown)
{
DBG(("ibc%d: ibc_updown %d\n", unit, 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
ibc_rx_data_rdy(int unit)
{
struct ibc_softc *sc = &ibc_softc[unit];
struct ifnet *ifp = &sc->sc_p2pcom.p2p_if;
struct mbuf *m, *m0;
char *buf;
int s;
if((m = *isdn_ibc_lt[unit]->rx_mbuf) == NULL)
return;
microtime(&ifp->if_lastchange);
ifp->if_ipackets++;
/* Walk the mbuf chain */
s = splimp();
for (m0 = m; m != 0; m = m->m_next) {
if (m->m_len == 0)
continue;
ifp->if_ibytes += m->m_len;
#if IBCACCT
sc->sc_inb += m->m_len;
#endif
buf = mtod(m, caddr_t);
if ((*sc->sc_p2pcom.p2p_hdrinput)(
&sc->sc_p2pcom, buf, m->m_len) >= 0)
(*sc->sc_p2pcom.p2p_input)(&sc->sc_p2pcom, 0);
}
splx(s);
m_freem(m0);
}
/*---------------------------------------------------------------------------*
* 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
ibc_tx_queue_empty(int unit)
{
ibc_start(&ibc_softc[unit].sc_p2pcom.p2p_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
ibc_activity(int unit, int rxtx)
{
ibc_softc[unit].sc_cdp->last_active_time = SECOND;
}
/*---------------------------------------------------------------------------*
* return this drivers linktab address
*---------------------------------------------------------------------------*/
drvr_link_t *
ibc_ret_linktab(int unit)
{
return(&ibc_drvr_linktab[unit]);
}
/*---------------------------------------------------------------------------*
* setup the isdn_ibc_lt for this driver
*---------------------------------------------------------------------------*/
void
ibc_set_linktab(int unit, isdn_link_t *ilt)
{
isdn_ibc_lt[unit] = ilt;
}
/*---------------------------------------------------------------------------*
* initialize this drivers linktab
*---------------------------------------------------------------------------*/
static void
ibc_init_linktab(int unit)
{
ibc_drvr_linktab[unit].unit = unit;
ibc_drvr_linktab[unit].bch_rx_data_ready = ibc_rx_data_rdy;
ibc_drvr_linktab[unit].bch_tx_queue_empty = ibc_tx_queue_empty;
ibc_drvr_linktab[unit].bch_activity = ibc_activity;
ibc_drvr_linktab[unit].line_connected = ibc_connect;
ibc_drvr_linktab[unit].line_disconnected = ibc_disconnect;
ibc_drvr_linktab[unit].dial_response = ibc_dialresponse;
ibc_drvr_linktab[unit].updown_ind = ibc_updown;
}
/*===========================================================================*/
static int
ibc_mdmctl(pp, flag)
struct p2pcom *pp;
int flag;
{
register struct ifnet *ifp = &pp->p2p_if;
struct ibc_softc *sc = (struct ibc_softc *)&ibc_softc[ifp->if_unit];
DBG(("ibc%d: ibc_mdmctl called flags=%d\n", IFP2UNIT(ifp), flag));
if (flag == 1 && sc->sc_state == ST_IDLE) {
sc->sc_state = ST_DIALING;
i4b_l4_dialout(BDRV_IBC, IFP2UNIT(ifp));
} else if (flag == 0 && sc->sc_state != ST_IDLE) {
sc->sc_state = ST_IDLE;
i4b_l4_drvrdisc(BDRV_IBC, IFP2UNIT(ifp));
}
return 0;
}
static int
ibc_getmdm(pp, arg)
struct p2pcom *pp;
caddr_t arg;
{
register struct ifnet *ifp = &pp->p2p_if;
struct ibc_softc *sc = (struct ibc_softc *)&ibc_softc[ifp->if_unit];
if (sc->sc_state == ST_CONNECTED)
*(int *)arg = TIOCM_CAR;
else
*(int *)arg = 0;
return 0;
DBG(("ibc%d: ibc_getmdm called ret=%d\n", IFP2UNIT(ifp), *(int *)arg));
}
#endif