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Documentation: mlx5.rst: Add note for eswitch MD

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Add a note when using esw_port_metadata. The parameter has runtime
mode but setting it does not take effect immediately. Setting it must
happen in legacy mode, and the port metadata takes effects when the
switchdev mode is enabled.

Disable eswitch port metadata::
  $ devlink dev param set pci/0000:06:00.0 name esw_port_metadata value \
    false cmode runtime
Change eswitch mode to switchdev mode where after choosing the metadata value::
  $ devlink dev eswitch set pci/0000:06:00.0 mode switchdev

Note that other mlx5 devlink runtime parameters, esw_multiport and
flow_steering_mode, do not have this limitation.

Signed-off-by: William Tu <witu@nvidia.com>
Reviewed-by: Jiri Pirko <jiri@nvidia.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
William Tu 2024-01-24 20:00:41 -08:00 committed by David S. Miller
parent 599b75a3b7
commit 6f83b62283
1 changed files with 4 additions and 0 deletions
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Documentation/networking/devlink/mlx5.rst
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@ -97,6 +97,10 @@ parameters.
When metadata is disabled, the above use cases will fail to initialize if
users try to enable them.
Note: Setting this parameter does not take effect immediately. Setting
must happen in legacy mode and eswitch port metadata takes effect after
enabling switchdev mode.
* - ``hairpin_num_queues``
- u32
- driverinit