linux-kernel - Re: New Address Family: Inter Process Networking (IPN)

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Date:	Wed, 5 Dec 2007 23:04:46 -0700
From:	Stephen Hemminger <shemminger@...ux-foundation.org>
To:	renzo@...unibo.it (Renzo Davoli)
Cc:	linux-kernel@...r.kernel.org
Subject: Re: New Address Family: Inter Process Networking (IPN)

On Thu, 6 Dec 2007 06:38:21 +0100
renzo@...unibo.it (Renzo Davoli) wrote:

> On Wed, Dec 05, 2007 at 04:55:52PM -0500, Stephen Hemminger wrote:
> > On Wed, 5 Dec 2007 17:40:55 +0100
> > renzo@...unibo.it (Renzo Davoli) wrote:
> > > 0- (Constructive) comments.
> > > 1- The "official" assignment of an Address Family.
> > > 2- Another "grabbing hook" for interfaces (like the ones already
> > > We are studying some way to register/deregister grabbing services,
> > > I feel this would be the cleanest way. 
> > 
> > Post complete source code for kernel part to netdev@...r.kernel.org.
> I'll do it as soon as possible.
> > If you want the hooks, you need to include the full source code for inclusion
> > in mainline. All the Documentation/SubmittingPatches rules apply;
> > you can't just ask for "facilitators" and expect to keep your stuff out of tree.
> I am sorry if I was misunderstood.
> I did not want any "facilitator", nor I wanted to keep my code outside
> the kernel, on the contrary.

Greate

> It is perfectly okay for me to provide the entire code for inclusion.
> The purposes of my message were the following:
> - I wanted to introduce the idea and say to the linux kernel community
>   that a team is working on it.
> - Address family: is it okay to send a patch that add a new AF?
> is there a "AF registry" somewhere? (like the device major/minor
> registry or the well-known port assignment for TCP-IP).

The usual process is to just add the value as part of the patchset.
You then need to tell the glibc maintainers so it gets included appropriately
in userspace.

> - Hook: we have two different options. We can add another grabbing
> inline function like those used by the bridge and macvlan or we can
> design a grabbing service registration facility. Which one is preferrable?

The problem with making it a registration facilties are:
 * risk of making it easier for non-GPL out of tree abuse
 * possible ordering issues: ie. by hardcoding each hook, the
    behaviour is defined in the case of multiple usages on the same
    machine.

> The former is simpler, the latter is more elegant but it requires some 
> changes in the kernel bridge code.

Not a big deal, but see above

> So the former choice is between less-invasive,safer,inelegant, the
> latter is more-invasive,less safe,elegant.

 
> We need a bit of time to stabilize the code: deeply testing the existing
> features and implementing some more ideas we have on it.
> In the meanwhile we would be grateful if the community could kindly ask to the
> questions above.

I am a believer in review early and often. It is easier to just deal with
the nuisance issues (style, naming, configuration) at the beginning rather
than the final stage of the project.
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