'RDMA write and RDMA write with immediate

I am trying to get more details on the RDMA write semantics. I have the following questions on the same.

  1. How the RDMA write and RDMA write with immediate works?
  2. If I use the RDMA write operation, can I read data from the local buffer on the peer side?
  3. Can we access the data that is stored in DDR memory? How to map virtual address to physical address and Is there any Infiniband API for the same?

Thanks.

rdma


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