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Date: Wed, 29 Aug 2018 08:54:10 -0700
From: Stephen Hemminger <stephen@networkplumber.org>
To: Dan Gora <dg@adax.com>
Cc: ferruh.yigit@intel.com, dev@dpdk.org
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Subject: Re: [dpdk-dev] [PATCH v2 10/10] kni: add API to set link status on
 kernel interface
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On Thu, 28 Jun 2018 18:55:08 -0700
Dan Gora <dg@adax.com> wrote:

> Add a new API function to KNI, rte_kni_update_link() to allow DPDK
> applications to update the link state for the KNI network interfaces
> in the linux kernel.
> 
> Note that the default carrier state is set to off when the interface
> is opened.
> 
> Signed-off-by: Dan Gora <dg@adax.com>

Do you really need a special ioctl for this?
There is already ability to set link state via sysfs or netlink.