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
hairpin_num_queues	u32	driverinit	We refer to a TC NIC rule that involves forwarding as "hairpin". Hairpin queues are mlx5 hardware specific implementation for hardware forwarding of such packets. Control the number of hairpin queues.
hairpin_queue_size	u32	driverinit	Control the size (in packets) of the hairpin queues.

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.