ioat_get_ring_ent
desc = ioat_get_ring_ent(ioat_chan, ioat_chan->head);
desc = ioat_get_ring_ent(ioat_chan, ioat_chan->tail);
prefetch(ioat_get_ring_ent(ioat_chan, idx + i + 1));
desc = ioat_get_ring_ent(ioat_chan, idx + i);
prefetch(ioat_get_ring_ent(ioat_chan, idx + i + 1));
desc = ioat_get_ring_ent(ioat_chan, idx + i);
desc = ioat_get_ring_ent(ioat_chan, ioat_chan->tail);
desc = ioat_get_ring_ent(ioat_chan, ioat_chan->tail);
desc = ioat_get_ring_ent(ioat_chan, ioat_chan->head + i);
desc = ioat_get_ring_ent(ioat_chan, ioat_chan->tail + i);
desc = ioat_get_ring_ent(ioat_chan, idx + i);
desc = ioat_get_ring_ent(ioat_chan, idx + i);
ext = ioat_get_ring_ent(ioat_chan, idx + i + 1);
compl_desc = ioat_get_ring_ent(ioat_chan, idx + i);
desc = ioat_get_ring_ent(ioat_chan, idx + i);
ext = ioat_get_ring_ent(ioat_chan, idx + i + with_ext);
compl_desc = ioat_get_ring_ent(ioat_chan, idx + i);
desc = ioat_get_ring_ent(ioat_chan, idx + i);
desc = ioat_get_ring_ent(ioat_chan, ioat_chan->head);