On 4/8/21 1:24 PM, gmingchen(陈供明) wrote:
> 
> 
> On 2021/4/7, 12:01 AM, "Dumitru Ceara" <dce...@redhat.com> wrote:
> 
>     On 4/6/21 12:11 PM, Mark Gray wrote:
>     > I had a conversation with Dumitru and this patch came up in the
>     > conversation. He made an interesting suggestion (Dumitru, please correct
>     > me if I get this wrong) that this could be refactored as an external
>     > tool. This cmdline tool could, for example, take a set of IP addresses
>     > and return the wildcard representation. For example,
>     > 
>     > # ./ovs-new-tool <set of addresses>
>     > <ip address/prefix> ... <ip address/prefix>
>     > 
>     > Then this tool could optionally be used by a CMS. The other advantage of
>     > this is that it could also be used in other places.
> 
>     Given that OVN is essentially a stack of compilers (NB -> SB ->
>     openflow) I was wondering if it would be reasonable and worth it to go a
>     step forward and implement this feature to "combine IP addresses with
>     wildcard" as a library.  This would allow using it at different levels
>     in the stack, e.g.:
>     - at CMS level/as a standalone cmdline tool.
> 
> My concern is whether the process after cms can correctly handle this
> non-standard cidr format (1.1.1.0/255.255.255.253).

I would expect this to not be a problem but it depends on CMS indeed.

> 
>     - in ovn-northd (for example when generating SB address sets from NB
>     address sets)
> 
> If the non-standard cidr format ip address can be handled reasonably
> here, I think this is a good idea.

These are OVN internals so the approach you were proposing in
ovn-controller could be implemented at this level too.

> 
>     - in ovn-controller (as the current patch is doing).
> 
> Thanks,
> Gongming
> 

Thanks,
Dumitru

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