/*
* Start output on interface. Get datagrams from the queue and output them,
* giving the receiver a chance between datagrams. Call only from splnet or
* interrupt level!
*/
void
elstart(struct ifnet *ifp)
{
struct el_softc *sc = ifp->if_softc;
bus_space_tag_t iot = sc->sc_iot;
bus_space_handle_t ioh = sc->sc_ioh;
struct mbuf *m, *m0;
int s, i, off, retries;
DPRINTF(("elstart()...\n"));
s = splnet();
/* Don't do anything if output is active. */
if ((ifp->if_flags & IFF_OACTIVE) != 0) {
splx(s);
return;
}
ifp->if_flags |= IFF_OACTIVE;
/*
* The main loop. They warned me against endless loops, but would I
* listen? NOOO....
*/
for (;;) {
/* Dequeue the next datagram. */
IFQ_DEQUEUE(&ifp->if_snd, m0);
/* If there's nothing to send, return. */
if (m0 == 0)
break;
/* Give the packet to the bpf, if any. */
bpf_mtap(ifp, m0);
/* Disable the receiver. */
bus_space_write_1(iot, ioh, EL_AC, EL_AC_HOST);
bus_space_write_1(iot, ioh, EL_RBC, 0);
/* Transfer datagram to board. */
DPRINTF(("el: xfr pkt length=%d...\n", m0->m_pkthdr.len));
off = EL_BUFSIZ - max(m0->m_pkthdr.len,
ETHER_MIN_LEN - ETHER_CRC_LEN);
#ifdef DIAGNOSTIC
if ((off & 0xffff) != off)
printf("%s: bogus off 0x%x\n",
device_xname(sc->sc_dev), off);
#endif
bus_space_write_1(iot, ioh, EL_GPBL, off & 0xff);
bus_space_write_1(iot, ioh, EL_GPBH, (off >> 8) & 0xff);
/* Copy the datagram to the buffer. */
for (m = m0; m != 0; m = m->m_next)
bus_space_write_multi_1(iot, ioh, EL_BUF,
mtod(m, u_int8_t *), m->m_len);
for (i = 0;
i < ETHER_MIN_LEN - ETHER_CRC_LEN - m0->m_pkthdr.len; i++)
bus_space_write_1(iot, ioh, EL_BUF, 0);
m_freem(m0);
/* Now transmit the datagram. */
retries = 0;
for (;;) {
bus_space_write_1(iot, ioh, EL_GPBL, off & 0xff);
bus_space_write_1(iot, ioh, EL_GPBH, (off >> 8) & 0xff);
if (el_xmit(sc)) {
ifp->if_oerrors++;
break;
}
/* Check out status. */
i = bus_space_read_1(iot, ioh, EL_TXS);
DPRINTF(("tx status=0x%x\n", i));
if ((i & EL_TXS_READY) == 0) {
DPRINTF(("el: err txs=%x\n", i));
if (i & (EL_TXS_COLL | EL_TXS_COLL16)) {
ifp->if_collisions++;
if ((i & EL_TXC_DCOLL16) == 0 &&
retries < 15) {
retries++;
bus_space_write_1(iot, ioh,
EL_AC, EL_AC_HOST);
}
} else {
ifp->if_oerrors++;
break;
}
} else {
ifp->if_opackets++;
break;
}
}
/*
* Now give the card a chance to receive.
* Gotta love 3c501s...
*/
(void)bus_space_read_1(iot, ioh, EL_AS);
bus_space_write_1(iot, ioh, EL_AC, EL_AC_IRQE | EL_AC_RX);
splx(s);
/* Interrupt here. */
s = splnet();
}
(void)bus_space_read_1(iot, ioh, EL_AS);
bus_space_write_1(iot, ioh, EL_AC, EL_AC_IRQE | EL_AC_RX);
ifp->if_flags &= ~IFF_OACTIVE;
splx(s);
}
/* Start output on interface. Get datagrams from the queue and output
* them, giving the receiver a chance between datagrams. Call only
* from splimp or interrupt level!
*/
static void
el_start(struct ifnet *ifp)
{
struct el_softc *sc;
u_short base;
struct mbuf *m, *m0;
int i, len, retries, done;
/* Get things pointing in the right directions */
sc = ifp->if_softc;
base = sc->el_base;
dprintf(("el_start()...\n"));
/* Don't do anything if output is active */
if (ifp->if_flags & IFF_OACTIVE)
return;
ifp->if_flags |= IFF_OACTIVE;
/* The main loop. They warned me against endless loops, but
* would I listen? NOOO....
*/
while(1) {
/* Dequeue the next datagram */
m0 = ifq_dequeue(&ifp->if_snd, NULL);
/* If there's nothing to send, return. */
if(m0 == NULL) {
sc->arpcom.ac_if.if_flags &= ~IFF_OACTIVE;
return;
}
/* Disable the receiver */
outb(base+EL_AC,EL_AC_HOST);
outb(base+EL_RBC,0);
/* Copy the datagram to the buffer. */
len = 0;
for(m = m0; m != NULL; m = m->m_next) {
if(m->m_len == 0)
continue;
bcopy(mtod(m,caddr_t),sc->el_pktbuf+len,m->m_len);
len += m->m_len;
}
m_freem(m0);
len = max(len,ETHER_MIN_LEN);
BPF_TAP(&sc->arpcom.ac_if, sc->el_pktbuf, len);
/* Transfer datagram to board */
dprintf(("el: xfr pkt length=%d...\n",len));
i = EL_BUFSIZ - len;
outb(base+EL_GPBL,(i & 0xff));
outb(base+EL_GPBH,((i>>8)&0xff));
outsb(base+EL_BUF,sc->el_pktbuf,len);
/* Now transmit the datagram */
retries=0;
done=0;
while(!done) {
if(el_xmit(sc,len)) { /* Something went wrong */
done = -1;
break;
}
/* Check out status */
i = inb(base+EL_TXS);
dprintf(("tx status=0x%x\n",i));
if(!(i & EL_TXS_READY)) {
dprintf(("el: err txs=%x\n",i));
sc->arpcom.ac_if.if_oerrors++;
if(i & (EL_TXS_COLL|EL_TXS_COLL16)) {
if((!(i & EL_TXC_DCOLL16)) && retries < 15) {
retries++;
outb(base+EL_AC,EL_AC_HOST);
}
}
else
done = 1;
}
else {
sc->arpcom.ac_if.if_opackets++;
done = 1;
}
}
if(done == -1) /* Packet not transmitted */
continue;
/* Now give the card a chance to receive.
* Gotta love 3c501s...
*/
inb(base+EL_AS);
outb(base+EL_AC,(EL_AC_IRQE|EL_AC_RX));
}
}
