Re: [PATCH libvirt master v2] interface type: add udp socket support

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On 08/31/2015 04:06 PM, Jonathan Toppins wrote:
On 08/31/2015 03:25 PM, Guido Günther wrote:
Hi,
On Sat, Aug 29, 2015 at 04:19:10PM -0400, Jonathan Toppins wrote:
Adds a new interface type using UDP sockets, this seems only applicable
to QEMU but have edited tree-wide to support the new interface type.

The interface type required the addition of a "localaddr" (local
address), this then maps into the following xml and qemu call.

<interface type='udp'>


Sine we do have

      <interface type='mcast'>

already wouldn't it be better to have something like

       <interface type='ucast' protocol='udp'>


This possibly could be better, my concern would be now tcp is configured differently than udp, no? Or are you saying something like:

    <interface type='ucast' protocol='udp|tcp'>

I think the case of a tcp connection is already handled by <interface type='client'> and <interface type='server'> together, so that doesn't seem likely to happen. I suppose it's possible someone would come up with an sctp-based transport in the future though. I'm undecided about this.



My concern here is this would be a bigger change and does libvirt have a stable xml configuration guarantee?

libvirt's guarantee of 100% backward-compatible stable API (both functions and XML) is one of the big reasons why we worry over this kind of detail so much :-) (so yeah, once it goes in, we will continue to accept it forever even if we later wish we had done it a different way)

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