140 lines
5.2 KiB
ReStructuredText
140 lines
5.2 KiB
ReStructuredText
.. SPDX-License-Identifier: GPL-2.0
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==============
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Devlink Params
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==============
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``devlink`` provides capability for a driver to expose device parameters for low
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level device functionality. Since devlink can operate at the device-wide
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level, it can be used to provide configuration that may affect multiple
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ports on a single device.
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This document describes a number of generic parameters that are supported
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across multiple drivers. Each driver is also free to add their own
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parameters. Each driver must document the specific parameters they support,
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whether generic or not.
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Configuration modes
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===================
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Parameters may be set in different configuration modes.
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.. list-table:: Possible configuration modes
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:widths: 5 90
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* - Name
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- Description
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* - ``runtime``
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- set while the driver is running, and takes effect immediately. No
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reset is required.
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* - ``driverinit``
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- applied while the driver initializes. Requires the user to restart
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the driver using the ``devlink`` reload command.
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* - ``permanent``
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- written to the device's non-volatile memory. A hard reset is required
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for it to take effect.
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Reloading
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---------
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In order for ``driverinit`` parameters to take effect, the driver must
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support reloading via the ``devlink-reload`` command. This command will
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request a reload of the device driver.
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.. _devlink_params_generic:
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Generic configuration parameters
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================================
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The following is a list of generic configuration parameters that drivers may
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add. Use of generic parameters is preferred over each driver creating their
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own name.
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.. list-table:: List of generic parameters
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:widths: 5 5 90
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* - Name
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- Type
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- Description
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* - ``enable_sriov``
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- Boolean
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- Enable Single Root I/O Virtualization (SRIOV) in the device.
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* - ``ignore_ari``
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- Boolean
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- Ignore Alternative Routing-ID Interpretation (ARI) capability. If
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enabled, the adapter will ignore ARI capability even when the
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platform has support enabled. The device will create the same number
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of partitions as when the platform does not support ARI.
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* - ``msix_vec_per_pf_max``
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- u32
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- Provides the maximum number of MSI-X interrupts that a device can
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create. Value is the same across all physical functions (PFs) in the
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device.
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* - ``msix_vec_per_pf_min``
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- u32
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- Provides the minimum number of MSI-X interrupts required for the
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device to initialize. Value is the same across all physical functions
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(PFs) in the device.
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* - ``fw_load_policy``
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- u8
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- Control the device's firmware loading policy.
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- ``DEVLINK_PARAM_FW_LOAD_POLICY_VALUE_DRIVER`` (0)
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Load firmware version preferred by the driver.
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- ``DEVLINK_PARAM_FW_LOAD_POLICY_VALUE_FLASH`` (1)
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Load firmware currently stored in flash.
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- ``DEVLINK_PARAM_FW_LOAD_POLICY_VALUE_DISK`` (2)
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Load firmware currently available on host's disk.
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* - ``reset_dev_on_drv_probe``
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- u8
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- Controls the device's reset policy on driver probe.
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- ``DEVLINK_PARAM_RESET_DEV_ON_DRV_PROBE_VALUE_UNKNOWN`` (0)
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Unknown or invalid value.
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- ``DEVLINK_PARAM_RESET_DEV_ON_DRV_PROBE_VALUE_ALWAYS`` (1)
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Always reset device on driver probe.
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- ``DEVLINK_PARAM_RESET_DEV_ON_DRV_PROBE_VALUE_NEVER`` (2)
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Never reset device on driver probe.
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- ``DEVLINK_PARAM_RESET_DEV_ON_DRV_PROBE_VALUE_DISK`` (3)
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Reset the device only if firmware can be found in the filesystem.
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* - ``enable_roce``
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- Boolean
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- Enable handling of RoCE traffic in the device.
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* - ``enable_eth``
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- Boolean
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- When enabled, the device driver will instantiate Ethernet specific
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auxiliary device of the devlink device.
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* - ``enable_rdma``
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- Boolean
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- When enabled, the device driver will instantiate RDMA specific
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auxiliary device of the devlink device.
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* - ``enable_vnet``
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- Boolean
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- When enabled, the device driver will instantiate VDPA networking
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specific auxiliary device of the devlink device.
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* - ``enable_iwarp``
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- Boolean
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- Enable handling of iWARP traffic in the device.
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* - ``internal_err_reset``
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- Boolean
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- When enabled, the device driver will reset the device on internal
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errors.
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* - ``max_macs``
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- u32
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- Typically macvlan, vlan net devices mac are also programmed in their
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parent netdevice's Function rx filter. This parameter limit the
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maximum number of unicast mac address filters to receive traffic from
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per ethernet port of this device.
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* - ``region_snapshot_enable``
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- Boolean
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- Enable capture of ``devlink-region`` snapshots.
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* - ``enable_remote_dev_reset``
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- Boolean
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- Enable device reset by remote host. When cleared, the device driver
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will NACK any attempt of other host to reset the device. This parameter
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is useful for setups where a device is shared by different hosts, such
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as multi-host setup.
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* - ``io_eq_size``
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- u32
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- Control the size of I/O completion EQs.
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* - ``event_eq_size``
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- u32
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- Control the size of asynchronous control events EQ.
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