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You're correct. Right now there is no way via the HTTP API to find which
segments a port is bound to.
This is something we can certainly consider adding, but it will need an RFE
so it wouldn't land until Newton at the earliest.

Have you considered writing an ML2 driver that just notifies Manilla of the
port's segment info? All of this information is available to ML2 drivers in
the PortContext object that is passed to them.

On Mon, Feb 29, 2016 at 6:48 AM, Ihar Hrachyshka <ihrachys at redhat.com>
wrote:

> Fixed neutron tag in the subject.
>
> Marc <marc at koderer.com> wrote:
>
> Hi Neutron team,
>>
>> I am currently working on a feature for hierarchical port binding support
>> in
>> Manila [1] [2]. Just to give some context: In the current implementation
>> Manila
>> creates a neutron port but let it unbound (state DOWN). Therefore Manila
>> uses
>> the port create only retrieve an IP address and segmentation ID (some
>> drivers
>> only support VLAN here).
>>
>> My idea is to change this behavior and do an actual port binding action
>> so that
>> the configuration of VLAN isn’t a manual job any longer. And that
>> multi-segment
>> and HPB is supported on the long-run.
>>
>> My current issue is: How can Manila retrieve the segment information for a
>> bound port? Manila only is interested in the last (bottom) segmentation ID
>> since I assume the storage is connected to a ToR switch.
>>
>> Database-wise it’s possible to query it using ml2_port_binding_levels
>> table.
>> But AFAIK there is no API to query this. The only information that is
>> exposed
>> are all segments of a network. But this is not sufficient to identify
>> which
>> segments actually used for a port binding.
>>
>> Regards
>> Marc
>> SAP SE
>>
>> [1]:
>> https://wiki.openstack.org/wiki/Manila/design/manila-newton-hpb-support
>> [2]: https://review.openstack.org/#/c/277731/
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