io_peer_mem: Peer Memory Client for IO/PFN/MIXEDMAP memory.

This kernel module is a client for Yishai Hadas's IB Peer Memory patch set [1]. The patch allows RDMA transfers with various types of memory like mmaped devices (that create PFN mappings) and mmaped files from DAX filesystems, such as those that reside on NVRAM devices (though these require the kernel patch in [2]).

This can be tested with either donard_rdma [3] or a patched version of the IB perftest toolset [4].

Some examples include:

• donard_rdma_server -m /mnt/dax_fs/test.dat
• ib_read_bw -n 20 -R -a --mmap=/mnt/dax_fs/test.dat
• ib_read_bw -n 20 -R -a --mmap=/dev/pfn_mmapable_char_dev
• ib_read_bw -n 20 -R -a --mmap=/sys/bus/pci/devices/0000:03:00.0/resource4_wc

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[1] http://comments.gmane.org/gmane.linux.drivers.rdma/21849

[2] https://github.com/sbates130272/linux-donard/commit/e50a659f074c285968a7404c0da2295093579509

[3] https://github.com/sbates130272/donard_rdma

[4] https://github.com/lsgunth/perftest