Symbol: igc_prev_desc
usr/src/uts/common/io/igc/igc_ring.c
1570
last_desc = igc_prev_desc(ring->itr_ring_tail, 1, igc->igc_tx_ndesc);
usr/src/uts/common/io/igc/igc_ring.c
863
tail = igc_prev_desc(cur_head, 1, igc->igc_rx_ndesc);