RDMA/core: Expose Completion Counter capabilities to userspace

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Add a dedicated query interface for completion counter capabilities
via UVERBS_METHOD_QUERY_COMP_CNTR_CAPS on the device object.

The query returns the maximum number of counters, maximum counter
value, and a bitmask of supported QP attach operations. Each field
is an optional ioctl attribute, allowing userspace to request only
the capabilities it needs.

Drivers implement the query_comp_cntr_caps operation to report
device-specific capabilities.

Reviewed-by: Yonatan Nachum <ynachum@amazon.com>
Signed-off-by: Michael Margolin <mrgolin@amazon.com>
Link: https://patch.msgid.link/20260722083603.30334-4-mrgolin@amazon.com
Signed-off-by: Leon Romanovsky <leon@kernel.org>

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Michael Margolin 2026-07-22 08:36:00 +00:00 • committed by Leon Romanovsky

parent 45e537bf58

commit c1c13e596f

4 changed files with 67 additions and 1 deletions

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1

drivers/infiniband/core/device.c

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51

drivers/infiniband/core/uverbs_std_types_device.c

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9

include/rdma/ib_verbs.h

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7

include/uapi/rdma/ib_user_ioctl_cmds.h

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