TX_NUM_DESC
r->r_avail_desc = TX_NUM_DESC;
if (cur == (TX_NUM_DESC - 1))
BFE_INC_SLOT(next, TX_NUM_DESC);
if (start == (TX_NUM_DESC - 1))
BFE_INC_SLOT(start, TX_NUM_DESC);
bfe->bfe_tx_ring.r_ndesc = TX_NUM_DESC;
bfe->bfe_tx_ring.r_avail_desc = TX_NUM_DESC;