[SPDK] Question about IOAT in SPDK

Hi, I'm working on using SPDK's IOAT feature to accelerate IO operations.
I only see the regular routine of how to use IOAT in example/IOAT/perf.c, 
I'd like to know whether IOAT can support this:
when an transaction completes, the IOAT hardware informs the CPU using interrupt instead of the CPU keep polling?
I see some flags in the ioat_spec.h (like int_enabled in spdk_ioat_pq_hw_desc).
can someone help me a little bit? 
how can i use interrupt to inform cpu when the ioat transaction is done?
thanks,
have a nice day