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The Linux Kernel
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  • mlx5 devlink support
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mlx5 devlink support¶

This document describes the devlink features implemented by the mlx5 device driver.

Parameters¶

Generic parameters implemented¶
Name Mode Validation
enable_roce driverinit Type: Boolean
io_eq_size driverinit The range is between 64 and 4096.
event_eq_size driverinit The range is between 64 and 4096.
max_macs driverinit The range is between 1 and 2^31. Only power of 2 values are supported.

The mlx5 driver also implements the following driver-specific parameters.

Driver-specific parameters implemented¶
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.
esw_multiport Boolean runtime

Control MultiPort E-Switch shared fdb mode.

An experimental mode where a single E-Switch is used and all the vports and physical ports on the NIC are connected to it.

An example is to send traffic from a VF that is created on PF0 to an uplink that is natively associated with the uplink of PF1

Note: Future devices, ConnectX-8 and onward, will eventually have this as the default to allow forwarding between all NIC ports in a single E-switch environment and the dual E-switch mode will likely get deprecated.

Default: disabled

The mlx5 driver supports reloading via DEVLINK_CMD_RELOAD

Info versions¶

The mlx5 driver reports the following versions

devlink info versions implemented¶
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.

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