netdev - Setting up interfaces in loopback mode using SIOCETHTOOL

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Date:	Tue, 16 Jun 2015 16:22:12 +0530
From:	Ashutosh Tripathi <azbycs@...il.com>
To:	netdev@...r.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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