netdev - Re: [patch net-next 2/2] openvswitch: introduce rtnl ops stub

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Date:	Thu, 26 Jun 2014 09:39:36 +0200
From:	Jiri Pirko <jiri@...nulli.us>
To:	"Eric W. Biederman" <ebiederm@...ssion.com>
Cc:	netdev@...r.kernel.org, davem@...emloft.net, pshelar@...ira.com,
	cwang@...pensource.com, nicolas.dichtel@...nd.com,
	david@...son.dropbear.id.au, sfeldma@...ulusnetworks.com,
	sucheta.chakraborty@...gic.com, stephen@...workplumber.org
Subject: Re: [patch net-next 2/2] openvswitch: introduce rtnl ops stub

Wed, Jun 25, 2014 at 07:13:09PM CEST, ebiederm@...ssion.com wrote:
>Jiri Pirko <jiri@...nulli.us> writes:
>
>> Wed, Jun 25, 2014 at 06:02:42PM CEST, ebiederm@...ssion.com wrote:
>>>Jiri Pirko <jiri@...nulli.us> writes:
>>>
>>>> This stub now allows userspace to see IFLA_INFO_KIND for ovs master and
>>>> IFLA_INFO_SLAVE_KIND for slave.
>>>
>>>I am puzzled why you don't implement full rtnl_link_operations support.
>>
>> openvswitch does not need that at the moment (most probably it never
>> will). Creation and deletion is handled over separate genl channel.
>>
>>>
>>>If all you want is to report which kind of driver you have I suspect
>>>implementing ethtool_ops.get_drvinfo is a much better fit.
>>
>> That is maybe partly true but that would not be consistent with bond, team,
>> bridge masters and slaves which benefit ops->kind to expose the type
>> into userspace.
>
>So instead of using the mechanism that is supported by most of the
>network drivers in the tree you are instead relying on a mechanism
>that only works for a handful of software defined network devices.

As I said, I just want openvswitch to be similar in this with
bridge/bond/team. ops->kind is there, its exposed to userspace, I don't
see any harm adding one another code which benefits that.

Note that this also allows to see slave kind.

>
>I really think exposing a kind at this point is lying to user space
>as having a kind implies that the netlink messages behind "ip link add"
>and "ip link del" work.

Proper -EOPNOTSUPP is returned. And is is the same as if !ops. The
behavior is not changed.

>
>Further I have seen nothing in what you are proposing that addresses
>that absolute horrible maintenance consequences of your patch.

I don't understand what maintenance consequences you have on mind. Would
you please exmplain? Thanks.

>
>Eric
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