Symbol: IGC_TDT
usr/src/uts/common/io/igc/igc_ring.c
1072
igc_write32(igc, IGC_TDT(ring->itr_idx), 0);
usr/src/uts/common/io/igc/igc_ring.c
1626
igc_write32(igc, IGC_TDT(ring->itr_idx), ring->itr_ring_tail);