Re: [patch net-next 0/4] net: allow to change carrier from userspace

[Stephen Hemminger <shemminger@vyatta.com>]

On Wed, 12 Dec 2012 11:58:03 +0100
Jiri Pirko <jiri@resnulli.us> wrote:

> This is basically a repost of my previous patchset:
> "[patch net-next-2.6 0/2] net: allow to change carrier via sysfs" from Aug 30
> 
> The way net-sysfs stores values changed and this patchset reflects it.
> Also, I exposed carrier via rtnetlink iface.
> 
> So far, only dummy driver uses carrier change ndo. In very near future
> team driver will use that as well.
> 
> Jiri Pirko (4):
>   net: add change_carrier netdev op
>   net: allow to change carrier via sysfs
>   rtnl: expose carrier value with possibility to set it
>   dummy: implement carrier change
> 
>  drivers/net/dummy.c          | 10 ++++++++++
>  include/linux/netdevice.h    |  7 +++++++
>  include/uapi/linux/if_link.h |  1 +
>  net/core/dev.c               | 19 +++++++++++++++++++
>  net/core/net-sysfs.c         | 15 ++++++++++++++-
>  net/core/rtnetlink.c         | 10 ++++++++++
>  6 files changed, 61 insertions(+), 1 deletion(-)
> 

I needed to do the same thing for a project we are working on and discovered
that there already is a working documented interface for doing that via
operstate mode. Therefore I can't recommend that the additional complexity
of a new API for this is required.