/*---------------------------------------------------------------------------*/
static void
collision(struct rdc_buf_list *q, struct neighbor_queue *n,
int num_transmissions)
{
struct qbuf_metadata *metadata;
metadata = (struct qbuf_metadata *)q->ptr;
csma_collisions += num_transmissions;
n->collisions += num_transmissions;
if(n->collisions > CSMA_MAX_BACKOFF) {
n->collisions = CSMA_MIN_BE;
/* Increment to indicate a next retry */
n->transmissions++;
}
if(n->transmissions >= metadata->max_transmissions) {
csma_dropped++;
tx_done(MAC_TX_COLLISION, q, n);
} else {
PRINTF("csma: rexmit collision %d\n", n->transmissions);
rexmit(q, n);
}
}
static void
rexmit_timer(ulong vp)
{
struct aoedev *d;
struct frame *f, *e;
struct sk_buff *sl;
register long timeout;
ulong flags, n;
d = (struct aoedev *) vp;
sl = NULL;
/* timeout is always ~150% of the moving average */
timeout = d->rttavg;
timeout += timeout >> 1;
spin_lock_irqsave(&d->lock, flags);
if (d->flags & DEVFL_TKILL) {
spin_unlock_irqrestore(&d->lock, flags);
return;
}
f = d->frames;
e = f + d->nframes;
for (; f<e; f++) {
if (f->tag != FREETAG && tsince(f->tag) >= timeout) {
n = f->waited += timeout;
n /= HZ;
if (n > aoe_deadsecs) { /* waited too long for response */
aoedev_downdev(d);
break;
}
rexmit(d, f);
}
}
if (d->flags & DEVFL_KICKME) {
d->flags &= ~DEVFL_KICKME;
aoecmd_work(d);
}
sl = d->sendq_hd;
d->sendq_hd = d->sendq_tl = NULL;
if (sl) {
n = d->rttavg <<= 1;
if (n > MAXTIMER)
d->rttavg = MAXTIMER;
}
d->timer.expires = jiffies + TIMERTICK;
add_timer(&d->timer);
spin_unlock_irqrestore(&d->lock, flags);
aoenet_xmit(sl);
}
/*---------------------------------------------------------------------------*/
static void
noack(struct rdc_buf_list *q, struct neighbor_queue *n, int num_transmissions)
{
struct qbuf_metadata *metadata;
metadata = (struct qbuf_metadata *)q->ptr;
csma_noack++;
csma_sent_packets++;
n->collisions = CSMA_MIN_BE;
n->transmissions += num_transmissions;
if(n->transmissions >= metadata->max_transmissions) {
csma_dropped++;
tx_done(MAC_TX_NOACK, q, n);
} else {
PRINTF("csma: rexmit noack %d\n", n->transmissions);
rexmit(q, n);
}
}
