1 .. SPDX-License-Identifier: GPL-2.0
7 ``devlink`` provides capability for a driver to expose device parameters for low
8 level device functionality. Since devlink can operate at the device-wide
9 level, it can be used to provide configuration that may affect multiple
10 ports on a single device.
12 This document describes a number of generic parameters that are supported
13 across multiple drivers. Each driver is also free to add their own
14 parameters. Each driver must document the specific parameters they support,
15 whether generic or not.
20 Parameters may be set in different configuration modes.
22 .. list-table:: Possible configuration modes
28 - set while the driver is running, and takes effect immediately. No
31 - applied while the driver initializes. Requires the user to restart
32 the driver using the ``devlink`` reload command.
34 - written to the device's non-volatile memory. A hard reset is required
35 for it to take effect.
40 In order for ``driverinit`` parameters to take effect, the driver must
41 support reloading via the ``devlink-reload`` command. This command will
42 request a reload of the device driver.
44 .. _devlink_params_generic:
46 Generic configuration parameters
47 ================================
48 The following is a list of generic configuration parameters that drivers may
49 add. Use of generic parameters is preferred over each driver creating their
52 .. list-table:: List of generic parameters
60 - Enable Single Root I/O Virtualization (SRIOV) in the device.
63 - Ignore Alternative Routing-ID Interpretation (ARI) capability. If
64 enabled, the adapter will ignore ARI capability even when the
65 platform has support enabled. The device will create the same number
66 of partitions as when the platform does not support ARI.
67 * - ``msix_vec_per_pf_max``
69 - Provides the maximum number of MSI-X interrupts that a device can
70 create. Value is the same across all physical functions (PFs) in the
72 * - ``msix_vec_per_pf_min``
74 - Provides the minimum number of MSI-X interrupts required for the
75 device to initialize. Value is the same across all physical functions
77 * - ``fw_load_policy``
79 - Control the device's firmware loading policy.
80 - ``DEVLINK_PARAM_FW_LOAD_POLICY_VALUE_DRIVER`` (0)
81 Load firmware version preferred by the driver.
82 - ``DEVLINK_PARAM_FW_LOAD_POLICY_VALUE_FLASH`` (1)
83 Load firmware currently stored in flash.
84 - ``DEVLINK_PARAM_FW_LOAD_POLICY_VALUE_DISK`` (2)
85 Load firmware currently available on host's disk.
86 * - ``reset_dev_on_drv_probe``
88 - Controls the device's reset policy on driver probe.
89 - ``DEVLINK_PARAM_RESET_DEV_ON_DRV_PROBE_VALUE_UNKNOWN`` (0)
90 Unknown or invalid value.
91 - ``DEVLINK_PARAM_RESET_DEV_ON_DRV_PROBE_VALUE_ALWAYS`` (1)
92 Always reset device on driver probe.
93 - ``DEVLINK_PARAM_RESET_DEV_ON_DRV_PROBE_VALUE_NEVER`` (2)
94 Never reset device on driver probe.
95 - ``DEVLINK_PARAM_RESET_DEV_ON_DRV_PROBE_VALUE_DISK`` (3)
96 Reset the device only if firmware can be found in the filesystem.
99 - Enable handling of RoCE traffic in the device.
100 * - ``internal_err_reset``
102 - When enabled, the device driver will reset the device on internal
106 - Specifies the maximum number of MAC addresses per ethernet port of
108 * - ``region_snapshot_enable``
110 - Enable capture of ``devlink-region`` snapshots.
111 * - ``enable_remote_dev_reset``
113 - Enable device reset by remote host. When cleared, the device driver
114 will NACK any attempt of other host to reset the device. This parameter
115 is useful for setups where a device is shared by different hosts, such