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RDMA device names are unique only within a network namespace, but an RDMA cgroup can account resources for devices from multiple namespaces. Duplicate names therefore make cgroup output ambiguous and can cause limit writes to select the wrong device. Use the system-wide RDMA device index to distinguish duplicate names while preserving the existing UAPI for unique names. Reject ambiguous name-only writes with -ENOTUNIQ and expose a complete device view to administrators. Signed-off-by: Jiri Pirko <jiri@nvidia.com> Link: https://patch.msgid.link/20260716132316.1495242-9-jiri@resnulli.us Signed-off-by: Leon Romanovsky <leon@kernel.org>