RING_DESC_SIZE
read_offset *= RING_DESC_SIZE;
write_offset += RING_DESC_SIZE;
cmpl_write_offset *= RING_DESC_SIZE;
cmpl_read_offset += RING_DESC_SIZE;
for (off = 0; off < RING_BD_SIZE; off += RING_DESC_SIZE) {
next_addr = off + RING_DESC_SIZE;
ring->bd_write_offset *= RING_DESC_SIZE;
ring->cmpl_read_offset *= RING_DESC_SIZE;
((offset) / RING_DESC_SIZE)
((index) * RING_DESC_SIZE)
(RING_BD_DESC_COUNT * RING_DESC_SIZE)
(RING_CMPL_DESC_COUNT * RING_DESC_SIZE)
bd_read_offset *= RING_DESC_SIZE;