Re: dummy ethernet devices and sysfs

On Wed, 13 Jan 2016 11:58:01 -0800
Warren Turkal [off-list ref] wrote:

Hi,

I was looking through sysfs today, and something interesting jumped
out at me after I loaded the dummy module.

This directory exists: /sys/class/net/wlp2s0/device/

This directory does not: /sys/class/net/dummy0/device/

I can find the module that is providing the wlp2s0 device with the following:
$ ls /sys/class/net/wlp2s0/device/driver/module/drivers/
pci:iwlwifi

Shouldn't dummy have something similar so that one can figure out
which module is providing the dummy0 device?

FWIW, I am running the latest Ubuntu 15.10 kernel (4.2.0-23-generic).

Thanks,
wt

If you look carefully at the /sys/class/net/wlp2s0/device/ you will
see it is a symlink to the underlying /sys directory for the hardware (PCI)
device.  Since dummy (and other virtual interfaces) have no hardware,
there is no symlink.