TCP Offload question on NDIS 5.1

Hello Everyone

I’m going to apply TCP offload mechanism on NDIS 5.1 driver and the E100bex sample has been referenced.
From the debug log, the NDIS_TASK_OFFLOAD is queried, and I response it just like the sample code do.
But there is no setting NDIS_TASK_OFFLOAD from NDIS later.

What should I do to make NDIS set NDIS_TASK_OFFLOAD?
Do I miss something?

Thanks for your reply~~