static void
w_timer(void* arg)
{
Ether* ether = (Ether*) arg;
Ctlr* ctlr = (Ctlr*)ether->ctlr;
ctlr->timerproc = up;
for(;;) {
tsleep(&up->sleep, return0, 0, MSperTick);
ctlr = (Ctlr*)ether->ctlr;
if(ctlr == 0)
break;
if((ctlr->state & (Attached|Power)) != (Attached|Power))
continue;
ctlr->ticks++;
ilock(ctlr);
// Seems that the card gets frames BUT does
// not send the interrupt; this is a problem because
// I suspect it runs out of receive buffers and
// stops receiving until a transmit watchdog
// reenables the card.
// The problem is serious because it leads to
// poor rtts.
// This can be seen clearly by commenting out
// the next if and doing a ping: it will stop
// receiving (although the icmp replies are being
// issued from the remote) after a few seconds.
// Of course this `bug' could be because I'm reading
// the card frames in the wrong way; due to the
// lack of documentation I cannot know.
if(csr_ins(ctlr, WR_EvSts)&WEvs) {
ctlr->tickintr++;
w_intr(ether);
}
if((ctlr->ticks % 10) == 0) {
if(ctlr->txtmout && --ctlr->txtmout == 0) {
ctlr->nwatchdogs++;
w_txdone(ctlr, WTxErrEv);
if(w_enable(ether)) {
DEBUG("wavelan: wdog enable failed\n");
}
w_txstart(ether);
}
if((ctlr->ticks % 120) == 0)
if(ctlr->txbusy == 0)
w_cmd(ctlr, WCmdEnquire, WTyp_Stats);
if(ctlr->scanticks > 0)
if((ctlr->ticks % ctlr->scanticks) == 0)
if(ctlr->txbusy == 0)
w_cmd(ctlr, WCmdEnquire, WTyp_Scan);
}
iunlock(ctlr);
}
pexit("terminated", 0);
}
void
w_transmit(Ether* ether)
{
Ctlr* ctlr = ether->ctlr;
if(ctlr == 0)
return;
ilock(ctlr);
ctlr->ntxrq++;
w_txstart(ether);
iunlock(ctlr);
}
static void
w_intr(Ether *ether)
{
int rc, txid;
Ctlr* ctlr = (Ctlr*) ether->ctlr;
if((ctlr->state & Power) == 0)
return;
if((ctlr->state & Attached) == 0){
csr_ack(ctlr, 0xffff);
csr_outs(ctlr, WR_IntEna, 0);
return;
}
rc = csr_ins(ctlr, WR_EvSts);
csr_ack(ctlr, ~WEvs); // Not interested in them
if(rc & WRXEv){
w_rxdone(ether);
csr_ack(ctlr, WRXEv);
}
if(rc & WTXEv){
w_txdone(ctlr, rc);
csr_ack(ctlr, WTXEv);
}
if(rc & WAllocEv){
ctlr->nalloc++;
txid = csr_ins(ctlr, WR_Alloc);
csr_ack(ctlr, WAllocEv);
if(txid == ctlr->txdid){
if((rc & WTXEv) == 0)
w_txdone(ctlr, rc);
}
}
if(rc & WInfoEv){
ctlr->ninfo++;
w_info(ether, ctlr);
csr_ack(ctlr, WInfoEv);
}
if(rc & WTxErrEv){
w_txdone(ctlr, rc);
csr_ack(ctlr, WTxErrEv);
}
if(rc & WIDropEv){
ctlr->nidrop++;
csr_ack(ctlr, WIDropEv);
}
w_txstart(ether);
}
long
w_ctl(Ether* ether, void* buf, long n)
{
Ctlr *ctlr;
if((ctlr = ether->ctlr) == nil)
error(Enonexist);
if((ctlr->state & Attached) == 0)
error(Eshutdown);
ilock(ctlr);
if(w_option(ctlr, buf, n)){
iunlock(ctlr);
error(Ebadctl);
}
if(ctlr->txbusy)
w_txdone(ctlr, WTxErrEv);
w_enable(ether);
w_txstart(ether);
iunlock(ctlr);
return n;
}
