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RDMA/efa: Add Completion Counters support

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Implement completion counters for the EFA device. Each completion
counter is backed by two EFA event counters, one for success
completions and one for error completions.

The driver creates umem for counters from private descriptor ioctl
attributes using core utility.

Read operations are not implemented as the counter values are accessed
directly from userspace through the mapped memory.

Reviewed-by: Yonatan Nachum <ynachum@amazon.com>
Signed-off-by: Michael Margolin <mrgolin@amazon.com>
Link: https://patch.msgid.link/20260722083603.30334-7-mrgolin@amazon.com
Signed-off-by: Leon Romanovsky <leon@kernel.org>
This commit is contained in:
Michael Margolin 2026-07-22 08:36:03 +00:00 • committed by Leon Romanovsky
commit 0e8e94c150
6 changed files with 450 additions and 2 deletions
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