# man > DEVLINK-DEV(8) [_DEVLINK-DEV_(8)](https://www.chedong.com/phpMan.php/man/DEVLINK-DEV/8/markdown) Linux [_DEVLINK-DEV_(8)](https://www.chedong.com/phpMan.php/man/DEVLINK-DEV/8/markdown) ## NAME devlink-dev - devlink device configuration ## SYNOPSIS **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_ ] **devlink dev selftests show **[ _DEV_ ] **devlink dev selftests run _**DEV_ [ **id _**ID..._ ] ## DESCRIPTION ### 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: BUS_NAME/BUS_ADDRESS ### 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 parameter **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 re‐ quire 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 value. _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 listed. ### 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 argu‐ ment 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-re‐ source 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 ac‐ tion will reload current firmware image. **limit no_reset **- Specifies limitation on reload action. If this argument is omitted limit is unspecified and the reload action is not limited. In such case driver implementation may in‐ clude 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 re‐ boot. _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 loader, such as /lib/firmware. **component _**NAME_ - If device stores multiple firmware images in non-volatile memory, this para‐ meter 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-dependent. ### devlink dev selftests show - shows supported selftests on devlink device. _DEV_ - specifies the devlink device. If this argument is omitted all selftests for devlink devices are listed. ### devlink dev selftests run - runs selftests on devlink device. _DEV_ - specifies the devlink device to execute selftests. **id _**ID..._ - The value of _ID(s)_ should match the selftests shown in **devlink dev selftests show** to execute selftests on the devlink device. If this argument is omitted all selftests sup‐ ported by devlink devices are executed. ## EXAMPLES 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 switchdev. 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 sup‐ ports it, user gets updates about the flash status. For example: Preparing to flash Flashing 100% Flashing done devlink dev selftests show pci/0000:01:00.0 Shows the supported selftests by the devlink device. devlink dev selftests run pci/0000:01:00.0 id flash Perform a flash test on the devlink device. ## SEE ALSO [**devlink**(8)](https://www.chedong.com/phpMan.php/man/devlink/8/markdown), [**devlink-port**(8)](https://www.chedong.com/phpMan.php/man/devlink-port/8/markdown), [**devlink-sb**(8)](https://www.chedong.com/phpMan.php/man/devlink-sb/8/markdown), [**devlink-monitor**(8)](https://www.chedong.com/phpMan.php/man/devlink-monitor/8/markdown), ## AUTHOR Jiri Pirko <> iproute2 14 Mar 2016 [_DEVLINK-DEV_(8)](https://www.chedong.com/phpMan.php/man/DEVLINK-DEV/8/markdown)