[PATCH net-next 0/3] devlink: Add boot-time eswitch mode defaults

[Tariq Toukan <tariqt@nvidia.com>]

Hi,

See detailed feature description by Mark below.

Regards,
Tariq


This series adds a devlink_eswitch_mode= kernel command line parameter
for applying a default devlink eswitch mode during device
initialization.

Following the discussion with Jakub[1] and the feedback on the RFC
postings, this version implements the direction that was agreed on: keep
the scope limited to a boot-time devlink eswitch mode default only.

The implementation is intended to support the following properties:

- A system may have multiple devlink devices that usually need the same
  configuration. For a configuration such as eswitch mode switchdev, a
  user can specify either all devlink devices or an explicit list of
  devices to which that mode applies.

- Deployments can set the devlink eswitch mode before normal userspace
  orchestration runs, while still using devlink concepts and driver
  callbacks rather than adding driver-specific module parameters.

A default is scoped to either all devlink handles or to a
comma-separated list of devlink handles, for example:

devlink_eswitch_mode=[*]:switchdev
devlink_eswitch_mode=[pci/0000:08:00.0,pci/0000:09:00.1]:switchdev_inactive

The supported modes are legacy, switchdev and switchdev_inactive.

mlx5 wires this into device initialization after the devlink instance is
registered and after mlx5 devlink operations are available, so eswitch
mode defaults can be applied to matching PCI devlink devices.

Patch 1 clears the mlx5 FW reset-in-progress bit before reloading after
a firmware reset.

Patch 2 adds the devlink eswitch mode boot-default parser, storage,
devl_apply_default_esw_mode() API and documentation for the
devlink_eswitch_mode= syntax.

Patch 3 calls devl_apply_default_esw_mode() from mlx5 device
initialization.

Changelog:

Since RFC v2:

- Replaced the generic devlink=[...]:esw:mode:<mode> command line API
  with devlink_eswitch_mode=[...]:<mode>.

- Simplified the parser to handle one eswitch mode parameter instead of
  a generic command/attribute grammar.

- Renamed devl_apply_defaults() to devl_apply_default_esw_mode().

- Added the mlx5 firmware reset cleanup as the first patch after the
  cover letter.

[1] https://lore.kernel.org/all/20260502184153.4fd8d06f@kernel.org/

RFC V1:
https://lore.kernel.org/all/20260506123739.1959770-1-mbloch@nvidia.com/

RFC V2:
https://lore.kernel.org/all/20260510185424.2041415-1-mbloch@nvidia.com/

Mark Bloch (3):
  net/mlx5: Clear FW reset-in-progress bit before reload
  devlink: Add eswitch mode boot defaults
  net/mlx5: Apply devlink default eswitch mode during init

 .../admin-guide/kernel-parameters.txt         |  25 ++
 .../networking/devlink/devlink-defaults.rst   |  80 ++++++
 Documentation/networking/devlink/index.rst    |   1 +
 .../ethernet/mellanox/mlx5/core/fw_reset.c    |  28 +-
 .../net/ethernet/mellanox/mlx5/core/main.c    |  17 ++
 include/net/devlink.h                         |   1 +
 net/devlink/core.c                            | 255 ++++++++++++++++++
 7 files changed, 396 insertions(+), 11 deletions(-)
 create mode 100644 Documentation/networking/devlink/devlink-defaults.rst


base-commit: 9bf93cb2e180a58d5984ba13daee95903ff4fc14
-- 
2.44.0