* dummy ethernet devices and sysfs
@ 2016-01-13 19:58 Warren Turkal
2016-01-13 20:16 ` Stephen Hemminger
0 siblings, 1 reply; 3+ messages in thread
From: Warren Turkal @ 2016-01-13 19:58 UTC (permalink / raw)
To: netdev
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
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: dummy ethernet devices and sysfs
2016-01-13 19:58 dummy ethernet devices and sysfs Warren Turkal
@ 2016-01-13 20:16 ` Stephen Hemminger
2016-01-13 22:54 ` Warren Turkal
0 siblings, 1 reply; 3+ messages in thread
From: Stephen Hemminger @ 2016-01-13 20:16 UTC (permalink / raw)
To: Warren Turkal; +Cc: netdev
On Wed, 13 Jan 2016 11:58:01 -0800
Warren Turkal <wt@penguintechs.org> 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.
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: dummy ethernet devices and sysfs
2016-01-13 20:16 ` Stephen Hemminger
@ 2016-01-13 22:54 ` Warren Turkal
0 siblings, 0 replies; 3+ messages in thread
From: Warren Turkal @ 2016-01-13 22:54 UTC (permalink / raw)
To: Stephen Hemminger; +Cc: netdev
On Wed, Jan 13, 2016 at 12:16 PM, Stephen Hemminger
<stephen@networkplumber.org> wrote:
> 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.
What's the right way for one find the module that caused dummy0 to exist?
wt
On Wed, Jan 13, 2016 at 12:16 PM, Stephen Hemminger
<stephen@networkplumber.org> wrote:
> On Wed, 13 Jan 2016 11:58:01 -0800
> Warren Turkal <wt@penguintechs.org> 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.
^ permalink raw reply [flat|nested] 3+ messages in thread
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