mlx4 devlink support

This document describes the devlink features implemented by the mlx4 device driver.

Parameters

Generic parameters implemented

Name	Mode
internal_err_reset	driverinit, runtime
max_macs	driverinit
region_snapshot_enable	driverinit, runtime

The mlx4 driver also implements the following driver-specific parameters.

Driver-specific parameters implemented

Name	Type	Mode	Description
enable_64b_cqe_eqe	Boolean	driverinit	Enable 64 byte CQEs/EQEs, if the FW supports it.
enable_4k_uar	Boolean	driverinit	Enable using the 4k UAR.

The mlx4 driver supports reloading via DEVLINK_CMD_RELOAD

Regions

The mlx4 driver supports dumping the firmware PCI crspace and health buffer during a critical firmware issue.

In case a firmware command times out, firmware getting stuck, or a non zero value on the catastrophic buffer, a snapshot will be taken by the driver.

The cr-space region will contain the firmware PCI crspace contents. The fw-health region will contain the device firmware's health buffer. Snapshots for both of these regions are taken on the same event triggers.