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RDMA/mlx5: Use UMEM attribute for SRQ doorbell record

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Add an optional mlx5 driver-namespace UMEM attribute on SRQ create so
userspace can supply the doorbell record umem explicitly, symmetric to
the CQ and QP sides. Resolve it inside mlx5_ib_db_map_user() and use it
as a private DBR page when present; otherwise take the existing UHW
share-or-pin path that preserves per-page DBR sharing across CQ/QP/SRQ
in the same process.

Add mlx5's first UVERBS_OBJECT_SRQ UAPI definition chain to attach the
new attr.

Signed-off-by: Jiri Pirko <jiri@nvidia.com>
Link: https://patch.msgid.link/20260701124015.64350-4-jiri@resnulli.us
Signed-off-by: Leon Romanovsky <leon@kernel.org>
This commit is contained in:
Jiri Pirko 2026-07-01 14:40:15 +02:00 • committed by Leon Romanovsky
commit aac287f4f1
4 changed files with 24 additions and 1 deletions
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