static void
igbetransmit(Ether* edev)
{
Block *bp;
Ctlr *ctlr;
Tdesc *tdesc;
RingBuf *tb;
int tdh;
/*
* For now there are no smarts here. Tuning comes later.
*/
ctlr = edev->ctlr;
ilock(&ctlr->tdlock);
/*
* Free any completed packets
* - try to get the soft tdh to catch the tdt;
* - if the packet had an underrun bump the threshold
* - the Tu bit doesn't seem to ever be set, perhaps
* because Rs mode is used?
*/
tdh = ctlr->tdh;
for(;;){
tdesc = &ctlr->tdba[tdh];
if(!(tdesc->status & Tdd))
break;
if(tdesc->status & Tu){
ctlr->ett++;
csr32w(ctlr, Ett, ctlr->ett);
}
tdesc->status = 0;
if(ctlr->tb[tdh] != nil){
freeb(ctlr->tb[tdh]);
ctlr->tb[tdh] = nil;
}
tdh = NEXT(tdh, Ntdesc);
}
ctlr->tdh = tdh;
/* copy packets from the software RingBuf to the transmission q */
/* from boot ether83815.c */
while((tb = &edev->tb[edev->ti])->owner == Interface){
bp = fromringbuf(edev);
/* put the buffer on the transmit queue */
if(ctlr->bqhead)
ctlr->bqtail->next = bp;
else
ctlr->bqhead = bp;
ctlr->bqtail = bp;
txstart(edev); /* kick transmitter */
tb->owner = Host; /* give descriptor back */
edev->ti = NEXT(edev->ti, edev->ntb);
}
iunlock(&ctlr->tdlock);
}
static void
i82563transmit(Ether* edev)
{
Block *bp;
Ctlr *ctlr;
Tdesc *tdesc;
RingBuf *tb;
int tdh;
ctlr = edev->ctlr;
ilock(&ctlr->tdlock);
/*
* Free any completed packets
* - try to get the soft tdh to catch the tdt;
* - if the packet had an underrun bump the threshold
* - the Tu bit doesn't seem to ever be set, perhaps
* because Rs mode is used?
*/
tdh = ctlr->tdh;
for(;;){
tdesc = &ctlr->tdba[tdh];
if(!(tdesc->status & Tdd))
break;
if(ctlr->tb[tdh] != nil){
freeb(ctlr->tb[tdh]);
ctlr->tb[tdh] = nil;
}
tdesc->status = 0;
tdh = NEXT(tdh, Ntdesc);
}
ctlr->tdh = tdh;
/* copy packets from the software RingBuf to the transmission q */
while((tb = &edev->tb[edev->ti])->owner == Interface){
bp = fromringbuf(edev);
// print("#l%d: tx %d %E %E\n", edev->ctlrno, edev->ti, bp->rp,
// bp->rp+6);
if(ctlr->bqhead)
ctlr->bqtail->next = bp;
else
ctlr->bqhead = bp;
ctlr->bqtail = bp;
txstart(edev); /* kick transmitter */
tb->owner = Host; /* give descriptor back */
edev->ti = NEXT(edev->ti, edev->ntb);
}
iunlock(&ctlr->tdlock);
}
