How to Enable and Disable Packet Forwarding Engine (PFE) at Runtime in Linux

[irfank]

Hello;

I am seeking a method to deactivate/partially disable /constrain/disable power the PFE in runtime.

[chenyin_h · Accepted solution]

Hello, @irfank

Thanks for the questions

Sorry that I am not sure which version BSP you are using nor which device referred to(S32G2 or G3?), let me take S32G2RDB2 with BSP40 for example.

Currently, the PM runtime feature is enabled by default in PFE Linux driver.

By default, the device PM control policy is “auto”, which means to allow the device to be power managed at run time. If you want to disable the run time PM, you may change it to “on”, which to prevent the device from being power managed, logs below for your reference.

root@s32g274ardb2:~# cat /sys/devices/platform/soc/46000000.pfe/power/control

auto

root@s32g274ardb2:~# echo "on" > /sys/devices/platform/soc/46000000.pfe/power/control

root@s32g274ardb2:~# cat /sys/devices/platform/soc/46000000.pfe/power/control

on 

Best Regards

Chenyin