ppp_io.c

eCos/RedBoot for勤研ARM AnywhereII(4510) 含全部源代码

                    if( (cyg_io_get_config( tp->t_handle, CYG_IO_GET_CONFIG_SERIAL_BUFFER_INFO, &info, &ilen ) == 0) &&
                        ((info.tx_bufsize-info.tx_count) >= elen) )
                    {
                        if( cyg_io_write( tp->t_handle, endseq, &elen) != 0 ) {
                            done = 0;
                        }
                    }
                    else
                    {
                        done = 0;
                    }
                }
#endif
		splx(s);
		if (done)
		    sc->sc_stats.ppp_obytes += q - endseq;
            } // if (done && m->m_next == NULL)

	    if (!done) {
		/* remember where we got to */
		m->m_data = start;
		m->m_len = len;
		break;
	    }

	    /* Finished with this mbuf; free it and move on. */
	    MFREE(m, m2);
	    m = m2;
	    if (m == NULL) {
		/* Finished a packet */
		break;
	    }
	    sc->sc_outfcs = pppfcs(sc->sc_outfcs, mtod(m, u_char *), m->m_len);
        } // for(;;)

	/*
	 * If m == NULL, we have finished a packet.
	 * If m != NULL, we've either done as much work this time
	 * as we need to, or else we've filled up the output queue.
	 */
	sc->sc_outm = m;
	if (m)
	    break;
    }

#ifndef __ECOS        
    /* Call pppstart to start output again if necessary. */
    s = spltty();
    pppstart(tp);

    /*
     * This timeout is needed for operation on a pseudo-tty,
     * because the pty code doesn't call pppstart after it has
     * drained the t_outq.
     */
    if (!idle && (sc->sc_flags & SC_TIMEOUT) == 0) {
	sc->sc_ch = timeout(ppp_timeout, (void *) sc, 1);
	sc->sc_flags |= SC_TIMEOUT;
    }
    
    splx(s);

#else

    s = spltty();

    if( sc->sc_outm != NULL &&
        cyg_thread_self() != tp->tx_thread )
    {
        cyg_semaphore_post( &tp->tx_sem );
    }
    
    splx(s);
    
#endif
    
}

//==========================================================================
/*
 * This gets called when a received packet is placed on
 * the inq, at splsoftnet. The pppd daemon is to be woken up to do a read().
 */
static void
pppasyncctlp(sc)
    struct ppp_softc *sc;
{
    struct tty *tp;
    int s;

    s = spltty();
    tp = (struct tty *) sc->sc_devp;
    
    tp->pppd_wakeup = 1;
    if( tp->pppd_thread != cyg_thread_self() )
        cyg_thread_release( tp->pppd_thread );

    splx(s);
}

//==========================================================================
/*
 * Allocate enough mbuf to handle current MRU.
 */
static void
pppgetm(sc)
    register struct ppp_softc *sc;
{
    struct mbuf *m, **mp;
    int len;

    mp = &sc->sc_m;
    for (len = sc->sc_mru + PPP_HDRLEN + PPP_FCSLEN; len > 0; ){
	if ((m = *mp) == NULL) {
	    MGETHDR(m, M_DONTWAIT, MT_DATA);
	    if (m == NULL)
		break;
	    *mp = m;
	    MCLGET(m, M_DONTWAIT);
	}
	len -= M_DATASIZE(m);
	mp = &m->m_next;
    }
}

//==========================================================================
/*
 * tty interface receiver interrupt.
 */

static unsigned paritytab[8] = {
    0x96696996, 0x69969669, 0x69969669, 0x96696996,
    0x69969669, 0x96696996, 0x96696996, 0x69969669
};

/*
 * Called when character is available from device driver.
 * Only guaranteed to be at splsofttty() or spltty()
 * This is safe to be called while the upper half's netisr is preempted.
 */
int
cyg_ppp_pppinput(c, tp)
    int c;
    register struct tty *tp;
{
    register struct ppp_softc *sc;
    struct mbuf *m;
    int ilen, s;

    sc = (struct ppp_softc *) tp->t_sc;
    if (sc == NULL || tp != (struct tty *) sc->sc_devp)
	return 0;

//    ++tk_nin;
    ++sc->sc_stats.ppp_ibytes;

    s = spltty();
    if (c & 0x80)
	sc->sc_flags |= SC_RCV_B7_1;
    else
	sc->sc_flags |= SC_RCV_B7_0;
    if (paritytab[c >> 5] & (1 << (c & 0x1F)))
	sc->sc_flags |= SC_RCV_ODDP;
    else
	sc->sc_flags |= SC_RCV_EVNP;
    splx(s);

    if (sc->sc_flags & SC_LOG_RAWIN)
	ppplogchar(sc, c);

    if (c == PPP_FLAG) {
	ilen = sc->sc_ilen;
	sc->sc_ilen = 0;
	if (sc->sc_rawin_count > 0) 
	    ppplogchar(sc, -1);

	/*
	 * If SC_ESCAPED is set, then we've seen the packet
	 * abort sequence "}~".
	 */
	if (sc->sc_flags & (SC_FLUSH | SC_ESCAPED)
	    || (ilen > 0 && sc->sc_fcs != PPP_GOODFCS)) {
	    s = spltty();
	    sc->sc_flags |= SC_PKTLOST;	/* note the dropped packet */
	    if ((sc->sc_flags & (SC_FLUSH | SC_ESCAPED)) == 0){
#if 1
		if (sc->sc_flags & SC_DEBUG)
		    diag_printf("ppp%d: bad fcs %x, pkt len %d\n",
                                sc->sc_if.if_unit, sc->sc_fcs, ilen);
#endif
		sc->sc_if.if_ierrors++;
		sc->sc_stats.ppp_ierrors++;
	    } else
		sc->sc_flags &= ~(SC_FLUSH | SC_ESCAPED);
	    splx(s);
	    return 0;
	}

	if (ilen < PPP_HDRLEN + PPP_FCSLEN) {
	    if (ilen) {
		if (sc->sc_flags & SC_DEBUG)
		    diag_printf("ppp%d: too short (%d)\n", sc->sc_if.if_unit, ilen);
		s = spltty();
		sc->sc_if.if_ierrors++;
		sc->sc_stats.ppp_ierrors++;
		sc->sc_flags |= SC_PKTLOST;
		splx(s);
	    }
	    return 0;
	}

	/*
	 * Remove FCS trailer.  Somewhat painful...
	 */
	ilen -= 2;
	if (--sc->sc_mc->m_len == 0) {
	    for (m = sc->sc_m; m->m_next != sc->sc_mc; m = m->m_next)
		;
	    sc->sc_mc = m;
	}
	sc->sc_mc->m_len--;

	/* excise this mbuf chain */
	m = sc->sc_m;
	sc->sc_m = sc->sc_mc->m_next;
	sc->sc_mc->m_next = NULL;

	ppppktin(sc, m, sc->sc_flags & SC_PKTLOST);
	if (sc->sc_flags & SC_PKTLOST) {
	    s = spltty();
	    sc->sc_flags &= ~SC_PKTLOST;
	    splx(s);
	}

	pppgetm(sc);
	return 0;
    }

    if (sc->sc_flags & SC_FLUSH) {
	if (sc->sc_flags & SC_LOG_FLUSH)
	    ppplogchar(sc, c);
	return 0;
    }

    if (c < 0x20 && (sc->sc_rasyncmap & (1 << c)))
	return 0;

    s = spltty();
    if (sc->sc_flags & SC_ESCAPED) {
	sc->sc_flags &= ~SC_ESCAPED;
	c ^= PPP_TRANS;
    } else if (c == PPP_ESCAPE) {
	sc->sc_flags |= SC_ESCAPED;
	splx(s);
	return 0;
    }
    splx(s);

    /*
     * Initialize buffer on first octet received.
     * First octet could be address or protocol (when compressing
     * address/control).
     * Second octet is control.
     * Third octet is first or second (when compressing protocol)
     * octet of protocol.
     * Fourth octet is second octet of protocol.
     */
    if (sc->sc_ilen == 0) {
	/* reset the first input mbuf */
	if (sc->sc_m == NULL) {
	    pppgetm(sc);
	    if (sc->sc_m == NULL) {
		if (sc->sc_flags & SC_DEBUG)
		    diag_printf("ppp%d: no input mbufs!\n", sc->sc_if.if_unit);
		goto flush;
	    }
	}
	m = sc->sc_m;
	m->m_len = 0;
	m->m_data = M_DATASTART(sc->sc_m);
	sc->sc_mc = m;
	sc->sc_mp = mtod(m, char *);
	sc->sc_fcs = PPP_INITFCS;
	if (c != PPP_ALLSTATIONS) {
	    if (sc->sc_flags & SC_REJ_COMP_AC) {
		if (sc->sc_flags & SC_DEBUG)
		    diag_printf("ppp%d: garbage received: 0x%x (need 0xFF)\n",
			   sc->sc_if.if_unit, c);
		goto flush;
	    }
	    *sc->sc_mp++ = PPP_ALLSTATIONS;
	    *sc->sc_mp++ = PPP_UI;
	    sc->sc_ilen += 2;
	    m->m_len += 2;
	}
    }
    if (sc->sc_ilen == 1 && c != PPP_UI) {
	if (sc->sc_flags & SC_DEBUG)
	    diag_printf("ppp%d: missing UI (0x3), got 0x%x\n",
		   sc->sc_if.if_unit, c);
	goto flush;
    }
    if (sc->sc_ilen == 2 && (c & 1) == 1) {
	/* a compressed protocol */
	*sc->sc_mp++ = 0;
	sc->sc_ilen++;
	sc->sc_mc->m_len++;
    }
    if (sc->sc_ilen == 3 && (c & 1) == 0) {
	if (sc->sc_flags & SC_DEBUG)
	    diag_printf("ppp%d: bad protocol %x\n", sc->sc_if.if_unit,
                        (sc->sc_mp[-1] << 8) + c);
	goto flush;
    }

    /* packet beyond configured mru? */
    if (++sc->sc_ilen > sc->sc_mru + PPP_HDRLEN + PPP_FCSLEN) {
	if (sc->sc_flags & SC_DEBUG)
	    diag_printf("ppp%d: packet too big\n", sc->sc_if.if_unit);
	goto flush;
    }

    /* is this mbuf full? */
    m = sc->sc_mc;
    if (M_TRAILINGSPACE(m) <= 0) {
	if (m->m_next == NULL) {
	    pppgetm(sc);
	    if (m->m_next == NULL) {
		if (sc->sc_flags & SC_DEBUG)
		    diag_printf("ppp%d: too few input mbufs!\n", sc->sc_if.if_unit);
		goto flush;
	    }
	}
	sc->sc_mc = m = m->m_next;
	m->m_len = 0;
	m->m_data = M_DATASTART(m);
	sc->sc_mp = mtod(m, char *);
    }

    ++m->m_len;
    *sc->sc_mp++ = c;
    sc->sc_fcs = PPP_FCS(sc->sc_fcs, c);

    return 0;

 flush:
    if (!(sc->sc_flags & SC_FLUSH)) {
	s = spltty();
	sc->sc_if.if_ierrors++;
	sc->sc_stats.ppp_ierrors++;
	sc->sc_flags |= SC_FLUSH;
	splx(s);
	if (sc->sc_flags & SC_LOG_FLUSH)
	    ppplogchar(sc, c);
    }
    return 0;
}

//==========================================================================

#define MAX_DUMP_BYTES	128

static void
ppplogchar(sc, c)
    struct ppp_softc *sc;
    int c;
{
    if (c >= 0)
	sc->sc_rawin[sc->sc_rawin_count++] = c;
    if (sc->sc_rawin_count >= sizeof(sc->sc_rawin)
	|| (c < 0 && sc->sc_rawin_count > 0)) {
        diag_printf("ppp%d input:\n");
        diag_vdump_buf_with_offset( diag_printf, sc->sc_rawin, sc->sc_rawin_count, sc->sc_rawin );
	sc->sc_rawin_count = 0;
    }
}

//==========================================================================
// End of ppp_io.c