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We are having multiple review cycles with all vendors trying to implement devlink-info. Let's expand the documentation with more information about what's implemented and motivation behind this interface in an attempt to make the implementations easier. Describe what each info section is supposed to contain, and make some references to other HW interfaces (PCI caps). Document how firmware management is expected to look, to make it clear how devlink-info and devlink-flash work in concert. Name some future work. v2: - improve wording v3: - improve wording Signed-off-by: Jakub Kicinski <kuba@kernel.org> Reviewed-by: Randy Dunlap <rdunlap@infradead.org> Signed-off-by: David S. Miller <davem@davemloft.net>
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4.0 KiB
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111 lines
4.0 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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* - ``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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- Specifies the maximum number of MAC addresses per ethernet port of
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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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