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ethervirtio: avoid dumping packets in txproc when ring gets full

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This commit is contained in:
cinap_lenrek 2014-12-07 15:34:53 +01:00
parent 964dafbdf0
commit aff0dc5e67
1 changed files with 26 additions and 23 deletions
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49
sys/src/9/pc/ethervirtio.c
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@ -197,33 +197,36 @@ txproc(void *v)
q->used->flags &= ~Rnointerrupt;
while((b = qbread(edev->oq, 1000000)) != nil){
i = q->avail->idx & (q->qmask >> 1);
if(q->block[i] == nil) {
/* slot free, fill in descriptor */
q->block[i] = b;
j = (i << 1) | 1;
q->desc[j].addr = PADDR(b->rp);
q->desc[j].len = BLEN(b);
coherence();
q->avail->idx++;
outs(ctlr->port+Qnotify, Vtxq);
} else {
/* transmit ring is full */
freeb(b);
for(;;){
/* retire completed packets */
while((i = q->lastused) != q->used->idx){
u = &q->usedent[i & q->qmask];
i = (u->id & q->qmask) >> 1;
if(q->block[i] == nil)
break;
freeb(q->block[i]);
q->block[i] = nil;
q->lastused++;
}
/* have free slot? */
i = q->avail->idx & (q->qmask >> 1);
if(q->block[i] == nil)
break;
/* ring full, wait and retry */
if(!vhasroom(q))
sleep(q, vhasroom, q);
}
/* free completed packets */
while((i = q->lastused) != q->used->idx){
u = &q->usedent[i & q->qmask];
i = (u->id & q->qmask) >> 1;
if((b = q->block[i]) == nil)
break;
q->block[i] = nil;
freeb(b);
q->lastused++;
}
/* slot is free, fill in descriptor */
q->block[i] = b;
j = (i << 1) | 1;
q->desc[j].addr = PADDR(b->rp);
q->desc[j].len = BLEN(b);
coherence();
q->avail->idx++;
outs(ctlr->port+Qnotify, Vtxq);
}
pexit("ether out queue closed", 1);