RDMA/mlx5: Add DMAH support for reg_user_mr/reg_user_dmabuf_mr

As part of this enhancement, allow the creation of an MKEY associated
with a DMA handle.

Additional notes:

MKEYs with TPH (i.e. TLP Processing Hints) attributes are currently not
UMR-capable unless explicitly enabled by firmware or hardware.
Therefore, to maintain such MKEYs in the MR cache, the TPH fields have
been added to the rb_key structure, with a dedicated hash bucket.

The ability to bypass the kernel verbs flow and create an MKEY with TPH
attributes using DEVX has been restricted. TPH must follow the standard
InfiniBand flow, where a DMAH is created with the appropriate security
checks and management mechanisms in place.

DMA handles are currently not supported in conjunction with On-Demand
Paging (ODP).

Re-registration of memory regions originally created with TPH attributes
is currently not supported.

Signed-off-by: Yishai Hadas <yishaih@nvidia.com>
Reviewed-by: Edward Srouji <edwards@nvidia.com>
Link: https://patch.msgid.link/1c485651cf8417694ddebb80446c5093d5a791a9.1752752567.git.leon@kernel.org


Signed-off-by: Leon Romanovsky <leon@kernel.org>