> The problem that I see is that the mmap is currently used for mapping
 > of doorbell page in different drivers.

The driver can use different offsets into the file to map different
things.  For example I believe ehca, ipath and qib already do this.

 > I cannot find a specific code for /dev/infiniband/uverbsX. Is this
 > device driver sharing the same functions like /dev/infiniband/rdmacm
 > or it has own implementation.

it is in drivers/infiniband/core/uverbs_main.c.

 - R.
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