.. SPDX-License-Identifier: GPL-2.0

==================== mlx4 devlink support

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

Parameters

.. list-table:: 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.

.. list-table:: Driver-specific parameters implemented :widths: 5 5 5 85

• • 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.