linux-stable/Documentation/networking/devlink/mlx5.rst
Jianbo Liu 87dac697a0 net/mlx5e: Add devlink fdb_large_groups parameter
Add a devlink parameter to control the number of large groups in a
autogrouped flow table. The default value is 15, and the range is between 1
and 1024.

The size of each large group can be calculated according to the following
formula: size = 4M / (fdb_large_groups + 1).

Examples:
- Set the number of large groups to 20.
    $ devlink dev param set pci/0000:82:00.0 name fdb_large_groups \
      cmode driverinit value 20

  Then run devlink reload command to apply the new value.
    $ devlink dev reload pci/0000:82:00.0

- Read the number of large groups in flow table.
    $ devlink dev param show pci/0000:82:00.0 name fdb_large_groups
    pci/0000:82:00.0:
      name fdb_large_groups type driver-specific
        values:
          cmode driverinit value 20

Signed-off-by: Jianbo Liu <jianbol@mellanox.com>
Reviewed-by: Vlad Buslov <vladbu@mellanox.com>
Reviewed-by: Roi Dayan <roid@mellanox.com>
Acked-by: Jiri Pirko <jiri@mellanox.com>
Signed-off-by: Saeed Mahameed <saeedm@mellanox.com>
2020-02-27 16:40:19 -08:00

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.. SPDX-License-Identifier: GPL-2.0
====================
mlx5 devlink support
====================
This document describes the devlink features implemented by the ``mlx5``
device driver.
Parameters
==========
.. list-table:: Generic parameters implemented
* - Name
- Mode
* - ``enable_roce``
- driverinit
The ``mlx5`` driver also implements the following driver-specific
parameters.
.. list-table:: Driver-specific parameters implemented
:widths: 5 5 5 85
* - Name
- Type
- Mode
- Description
* - ``flow_steering_mode``
- string
- runtime
- Controls the flow steering mode of the driver
* ``dmfs`` Device managed flow steering. In DMFS mode, the HW
steering entities are created and managed through firmware.
* ``smfs`` Software managed flow steering. In SMFS mode, the HW
steering entities are created and manage through the driver without
firmware intervention.
* - ``fdb_large_groups``
- u32
- driverinit
- Control the number of large groups (size > 1) in the FDB table.
* The default value is 15, and the range is between 1 and 1024.
The ``mlx5`` driver supports reloading via ``DEVLINK_CMD_RELOAD``
Info versions
=============
The ``mlx5`` driver reports the following versions
.. list-table:: devlink info versions implemented
:widths: 5 5 90
* - Name
- Type
- Description
* - ``fw.psid``
- fixed
- Used to represent the board id of the device.
* - ``fw.version``
- stored, running
- Three digit major.minor.subminor firmware version number.