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RDMA/ionic: map PHC state into user space

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Enable user space applications to access the PHC state page when
firmware RDMA completion timestamp is supported.

This mapping allows user space to convert RDMA completion timestamps
to system wall time without kernel transitions, minimizing latency
overhead. Applications can directly read the PHC state through mmap,
enabling efficient timestamp correlation for precision timing
applications.

Co-developed-by: Allen Hubbe <allen.hubbe@amd.com>
Signed-off-by: Allen Hubbe <allen.hubbe@amd.com>
Signed-off-by: Abhijit Gangurde <abhijit.gangurde@amd.com>
Link: https://patch.msgid.link/20260610154216.712374-4-abhijit.gangurde@amd.com
Signed-off-by: Leon Romanovsky <leon@kernel.org>
This commit is contained in:
Abhijit Gangurde 2026-06-10 21:12:14 +05:30 • committed by Leon Romanovsky
commit 7462d18889
5 changed files with 40 additions and 0 deletions
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