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Show First 20 Lines • Show All 326 Lines • ▼ Show 20 Lines	igb_isc_txd_credits_update(void *arg, uint16_t txqid, bool clear)
/* If clear is false just let caller know that there		/* If clear is false just let caller know that there
* are descriptors to reclaim */		* are descriptors to reclaim */
if (!clear)		if (!clear)
return (1);		return (1);

prev = txr->tx_cidx_processed;		prev = txr->tx_cidx_processed;
ntxd = scctx->isc_ntxd[0];		ntxd = scctx->isc_ntxd[0];
do {		do {
		MPASS(prev != cur);
delta = (int32_t)cur - (int32_t)prev;		delta = (int32_t)cur - (int32_t)prev;
/*
* XXX This appears to be a hack for first-packet.
* A correct fix would prevent prev == cur in the first place.
*/
MPASS(prev == 0 \|\| delta != 0);
if (prev == 0 && cur == 0)
delta += 1;
if (delta < 0)		if (delta < 0)
delta += ntxd;		delta += ntxd;
		MPASS(delta > 0);

processed += delta;		processed += delta;
prev = cur;		prev = cur;
rs_cidx = (rs_cidx + 1) & (ntxd-1);		rs_cidx = (rs_cidx + 1) & (ntxd-1);
if (rs_cidx == txr->tx_rs_pidx)		if (rs_cidx == txr->tx_rs_pidx)
break;		break;
cur = txr->tx_rsq[rs_cidx];		cur = txr->tx_rsq[rs_cidx];
status = ((union e1000_adv_tx_desc *)&txr->tx_base[cur])->wb.status;		status = ((union e1000_adv_tx_desc *)&txr->tx_base[cur])->wb.status;
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