devlink: add per-port resource support

From:		Tariq Toukan <tariqt-AT-nvidia.com>
To:		Eric Dumazet <edumazet-AT-google.com>, Jakub Kicinski <kuba-AT-kernel.org>, Paolo Abeni <pabeni-AT-redhat.com>, Andrew Lunn <andrew+netdev-AT-lunn.ch>, "David S. Miller" <davem-AT-davemloft.net>
Subject:		[PATCH net-next 0/5] devlink: add per-port resource support
Date:		Tue, 03 Feb 2026 09:10:28 +0200
Message-ID:		<20260203071033.1709445-1-tariqt@nvidia.com>
Cc:		Donald Hunter <donald.hunter-AT-gmail.com>, Jiri Pirko <jiri-AT-resnulli.us>, Jonathan Corbet <corbet-AT-lwn.net>, Saeed Mahameed <saeedm-AT-nvidia.com>, "Leon Romanovsky" <leon-AT-kernel.org>, Tariq Toukan <tariqt-AT-nvidia.com>, Mark Bloch <mbloch-AT-nvidia.com>, Shuah Khan <shuah-AT-kernel.org>, <netdev-AT-vger.kernel.org>, <linux-kernel-AT-vger.kernel.org>, <linux-doc-AT-vger.kernel.org>, <linux-rdma-AT-vger.kernel.org>, <linux-kselftest-AT-vger.kernel.org>, Gal Pressman <gal-AT-nvidia.com>, Moshe Shemesh <moshe-AT-nvidia.com>, Shay Drori <shayd-AT-nvidia.com>, Jiri Pirko <jiri-AT-nvidia.com>
Archive-link:		Article

Hi,

This series adds devlink per-port resource support.
See detailed description by Or below [1].

Regards,
Tariq

[1]
Currently, devlink resources are only available at the device level.
However, some resources are inherently per-port, such as the maximum
number of subfunctions (SFs) that can be created on a specific PF port.
This limitation prevents user space from obtaining accurate per-port
capacity information.
This series adds infrastructure for per-port resources in devlink core
and implements it in the mlx5 driver to expose the max_SFs resource
on PF devlink ports.

Patch #1 adds devlink core infrastructure for per-port resources
Patch #2 registers SF resource on PF port representor in mlx5
         support dump
Patch #3 adds port resource registration to netdevsim for testing
Patch #4 adds selftest for devlink port resources
Patch #5 adds documentation for port-level resources

With this series (and upcoming userspace patches), users can query
per-port resources:

$ devlink port resource show pci/0000:03:00.0/196608
pci/0000:03:00.0/196608:
  name max_SFs size 20 unit entry

$ devlink port resource show
pci/0000:03:00.0/196608:
  name max_SFs size 20 unit entry
pci/0000:03:00.1/262144:
  name max_SFs size 20 unit entry

Or Har-Toov (5):
  devlink: Add port-level resource infrastructure
  net/mlx5: Register SF resource on PF port representor
  netdevsim: Add devlink port resource registration
  selftest: netdevsim: Add devlink port resource test
  devlink: Document port-level resources

 Documentation/netlink/specs/devlink.yaml      |  23 ++
 .../networking/devlink/devlink-resource.rst   |  36 +++
 .../net/ethernet/mellanox/mlx5/core/devlink.h |   4 +
 .../mellanox/mlx5/core/esw/devlink_port.c     |  37 +++
 drivers/net/netdevsim/dev.c                   |  22 +-
 drivers/net/netdevsim/netdevsim.h             |   4 +
 include/net/devlink.h                         |   8 +
 include/uapi/linux/devlink.h                  |   2 +
 net/devlink/netlink.c                         |   2 +-
 net/devlink/netlink_gen.c                     |  32 +-
 net/devlink/netlink_gen.h                     |   6 +-
 net/devlink/port.c                            |   3 +
 net/devlink/resource.c                        | 282 ++++++++++++++----
 .../drivers/net/netdevsim/devlink.sh          |  32 +-
 14 files changed, 434 insertions(+), 59 deletions(-)


base-commit: a22f57757f7e88c890499265c383ecb32900b645
-- 
2.40.1