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

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.