Memory Region (MR)
Every memory buffer that is being accessed by the RDMA device needs to be registered. During the registration process, the memory will be pinned (prevented from being swapped out), and the memory translation information (from virtual addresses 
physical addresses) will be saved in the RDMA device. After the registration, every Memory Region has two keys: one for local access and one for remote access. Those keys will be used when specifying those memory buffers in Work Requests.
The ib_get_dma_mr() Method
The ib_get_dma_mr() method returns a Memory Region for system memory that is usable for DMA. Creating this MR isn’t enough, ...
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