RE: Setting up interfaces in loopback mode using SIOCETHTOOL

-----Original Message-----
From: netdev-owner@vger.kernel.org [mailto:netdev-
owner@vger.kernel.org] On Behalf Of Ashutosh Tripathi
Sent: Tuesday, June 16, 2015 3:52 AM
To: netdev@vger.kernel.org
Subject: Setting up interfaces in loopback mode using SIOCETHTOOL

Hi All,

In spite of several days of trying to get information out of ethtool source
code, I could not get a way to set the loopback mode for network interfaces.
I was also referring to the driver code for ixgbe devices to get more info on
the support it provides to ethtool. In the driver code, there seems to be a
way to set the loopback mode. But I had no idea how to refer to this code
from user space.

The SIOCETHTOOL is pretty general purpose. There is a way to test the
interface in loopback mode via the command line interface. But I just wanted
to set the interface in loopback mode so that I could send packets on the
interface myself and stress the interface.

Please help me with any suggestion in this regard.

Thanks,
----
Ashutosh
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Hey Ashutosh,

Currently ixgbe only uses MAC loopback via the ethtool self_test, which doesn't sound like what you're looking for.  I don't know of an ethtool interface to tell an adapter to go into loopback mode, but this might just be because the driver I currently work on (ixgbe) doesn't support it. :)

Thanks,
-Don Skidmore [off-list ref]