ring_ptr_move_fw
ring_ptr_move_fw(ring, next_to_use);
ring_ptr_move_fw(ring, next_to_use);
ring_ptr_move_fw(ring, next_to_clean);
ring_ptr_move_fw(ring, next_to_clean);
ring_ptr_move_fw(ring, next_to_clean);
ring_ptr_move_fw(ring, next_to_use);
ring_ptr_move_fw(ring, next_to_clean);
ring_ptr_move_fw(ring, next_to_use);
ring_ptr_move_fw(ring, next_to_use);
ring_ptr_move_fw(ring, next_to_use);
ring_ptr_move_fw(ring, next_to_clean);
ring_ptr_move_fw(ring, next_to_use);
ring_ptr_move_fw(ring, next_to_use);