netdev - Re: [PATCH 2/2] IPVS: Add genetlink interface implementation

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Date:	Wed, 16 Jul 2008 15:03:40 +0200
From:	"Julius Volz" <juliusv@...gle.com>
To:	"Thomas Graf" <tgraf@...g.ch>
Cc:	"Patrick McHardy" <kaber@...sh.net>, netdev@...r.kernel.org,
	lvs-devel@...r.kernel.org, vbusam@...gle.com, horms@...ge.net.au,
	davem@...emloft.net
Subject: Re: [PATCH 2/2] IPVS: Add genetlink interface implementation

On Wed, Jul 16, 2008, Thomas Graf wrote:
> * Julius Volz <juliusv@...gle.com> 2008-07-11 01:16
>> If a single operation just means create _or_ update (NLM_F_EXCL, etc.
>> flags don't work with genetlink), then ipvsadm would have to query for
>> an entry first, which is racy and ugly. So I'd like to keep ADD/EDIT
>> in separate commands. But then I need a different response id (or just
>> use the ADD id?) for a GET.
>
> That's fine, both methods a) adding your own NLM_F_ flags to genetlink
> and b) using separate commands would be straight forward and easy to
> understand.

Great.

> The key point is that a GET or DUMP request should be answered with
> one or more NEW requests. An ADD, SET, or DEL request should be simply
> ACKed or aborted with an error message. Optionally it can trigger a
> notification message which should be either a NEW or DEL request.

Makes sense.

> Using SET to explicitely update an object is fine as well. The reason we
> are not using it in the context of notifications is that listeners can
> appear at any time so the listener may not have been around at the time
> the object was created.

Hm, I like that option most. So if you think it's ok, I will use NEW =
add and SET = edit.

Julius

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