devlink-dev(8) — Linux manual page


DEVLINK-DEV(8)                    Linux                   DEVLINK-DEV(8)

NAME         top

       devlink-dev - devlink device configuration

SYNOPSIS         top

       devlink [ OPTIONS ] dev  { COMMAND | help }

       OPTIONS := { -V[ersion] | -n[no-nice-names] }

       devlink dev show [ DEV ]

       devlink dev help

       devlink dev eswitch set DEV [ mode { legacy | switchdev } ] [
               inline-mode { none | link | network | transport } ] [
               encap-mode { none | basic } ]

       devlink dev eswitch show DEV

       devlink dev param set DEV name PARAMETER value VALUE cmode {
               runtime | driverinit | permanent }

       devlink dev param show [ DEV name PARAMETER ]

       devlink dev reload DEV [ netns { PID | NAME | ID } ] [ action {
               driver_reinit | fw_activate } ] [ limit no_reset ]

       devlink dev info [ DEV ]

       devlink dev flash DEV file PATH [ target ID ]

DESCRIPTION         top

   devlink dev show - display devlink device attributes
       DEV - specifies the devlink device to show.  If this argument is
       omitted all devices are listed.

           Format is:

   devlink dev eswitch show - display devlink device eswitch attributes
   devlink dev eswitch set - sets devlink device eswitch attributes
       mode { legacy | switchdev }
              Set eswitch mode

              legacy - Legacy SRIOV

              switchdev - SRIOV switchdev offloads

       inline-mode { none | link | network | transport }
              Some HWs need the VF driver to put part of the packet
              headers on the TX descriptor so the e-switch can do proper
              matching and steering.

              none - None

              link - L2 mode

              network - L3 mode

              transport - L4 mode

       encap-mode { none | basic }
              Set eswitch encapsulation support

              none - Disable encapsulation support

              basic - Enable encapsulation support

   devlink dev param set - set new value to devlink device configuration
       name PARAMETER
              Specify parameter name to set.

       value VALUE
              New value to set.

       cmode { runtime | driverinit | permanent }
              Configuration mode in which the new value is set.

              runtime - Set new value while driver is running. This
              configuration mode doesn't require any reset to apply the
              new value.

              driverinit - Set new value which will be applied during
              driver initialization. This configuration mode requires
              restart driver by devlink reload command to apply the new

              permanent - New value is written to device's non-volatile
              memory. This configuration mode requires hard reset to
              apply the new value.

   devlink dev param show - display devlink device supported
       configuration parameters attributes
       name PARAMETER Specify parameter name to show.  If this argument
       is omitted all parameters supported by devlink devices are

   devlink dev reload - perform hot reload of the driver.
       DEV - Specifies the devlink device to reload.

       netns { PID | NAME | ID } - Specifies the network namespace to
       reload into, either by pid, name or id.

       action { driver_reinit | fw_activate } - Specifies the reload
       action required.  If this argument is omitted driver_reinit
       action will be used.  Note that even though user asks for a
       specific action, the driver implementation might require to
       perform another action alongside with it. For example, some
       driver do not support driver reinitialization being performed
       without fw activation. Therefore, the devlink reload command
       returns the list of actions which were actrually performed.

       driver_reinit - Driver entities re-initialization, applying
       devlink-param and devlink-resource values.

       fw_activate - Activates new firmware if such image is stored and
       pending activation. If no limitation specified this action may
       involve firmware reset. If no new image pending this action will
       reload current firmware image.

       limit no_reset - Specifies limitation on reload action.  If this
       argument is omitted limit is unspecificed and the reload action
       is not limited. In such case driver implementation may include
       reset or downtime as needed to perform the actions.

       no_reset - No reset allowed, no down time allowed, no link flap
       and no configuration is lost.

   devlink dev info - display device information.
       Display device information provided by the driver. This command
       can be used to query versions of the hardware components or
       device components which can't be updated ( fixed ) as well as
       device firmware which can be updated. For firmware components
       running displays the versions of firmware currently loaded into
       the device, while stored reports the versions in device's flash.
       Running and stored versions may differ after flash has been
       updated, but before reboot.

       DEV - specifies the devlink device to show.  If this argument is
       omitted all devices are listed.

   devlink dev flash - write device's non-volatile memory.
       DEV - specifies the devlink device to write to.

       file PATH - Path to the file which will be written into device's
       flash. The path needs to be relative to one of the directories
       searched by the kernel firmware loaded, such as /lib/firmware.

       component NAME - If device stores multiple firmware images in
       non-volatile memory, this parameter may be used to indicate which
       firmware image should be written.  The value of NAME should match
       the component names from devlink dev info and may be driver-

EXAMPLES         top

       devlink dev show
           Shows the state of all devlink devices on the system.

       devlink dev show pci/0000:01:00.0
           Shows the state of specified devlink device.

       devlink dev eswitch show pci/0000:01:00.0
           Shows the eswitch mode of specified devlink device.

       devlink dev eswitch set pci/0000:01:00.0 mode switchdev
           Sets the eswitch mode of specified devlink device to

       devlink dev param show pci/0000:01:00.0 name max_macs
           Shows the parameter max_macs attributes.

       devlink dev param set pci/0000:01:00.0 name internal_error_reset
       value true cmode runtime
           Sets the parameter internal_error_reset of specified devlink
           device to true.

       devlink dev reload pci/0000:01:00.0
           Performs hot reload of specified devlink device.

       devlink dev flash pci/0000:01:00.0 file firmware.bin
           Flashes the specified devlink device with provided firmware
           file name. If the driver supports it, user gets updates about
           the flash status. For example:
           Preparing to flash
           Flashing 100%
           Flashing done

SEE ALSO         top

       devlink(8), devlink-port(8), devlink-sb(8), devlink-monitor(8),

AUTHOR         top

       Jiri Pirko <>

COLOPHON         top

       This page is part of the iproute2 (utilities for controlling
       TCP/IP networking and traffic) project.  Information about the
       project can be found at 
       If you have a bug report for this manual page, send it to,  This page was
       obtained from the project's upstream Git repository
       ⟨⟩ on
       2021-08-27.  (At that time, the date of the most recent commit
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iproute2                       14 Mar 2016                DEVLINK-DEV(8)

Pages that refer to this page: devlink(8)devlink-dpipe(8)devlink-health(8)devlink-monitor(8)devlink-port(8)devlink-region(8)devlink-sb(8)devlink-trap(8)