Move Inventory.Item.Board from Redfish Chassis to Redfish Assembly

[Gunnar Mills]

On 4/28/2021 10:46 AM, Ed Tanous wrote:
> On Wed, Apr 28, 2021 at 9:18 AM Gunnar Mills <gmills at linux.vnet.ibm.com> wrote:
>>
>>   From some discussion on Discord a few weeks ago. A newer way of
>> thinking in Redfish is for a simple rack server to just have one Redfish
>> Chassis and things like boards modeled as Redfish Assemblies under the
>> Chassis.[1][2] Today we look for inventory item chassis and inventory
>> item board[3] to populate the Chassis collection.[4] I propose we move
>> the "Inventory.Item.Board" from Redfish Chassis to Redfish Assembly.
>> Does this break anyone?
> 
> This will definitely break people, given that sensors can be attached
> to boards today, and (unless I'm mistaken) Assemblies don't have their
> own sensors.  Is there a solution to the sensor issue baked into this
> proposal?

Looking at the documentation on the sensor associations[1],
the bmcweb code, and association code[2] (e.g. [3]) sensors all look to 
be associated with an inventory item chassis today for Redfish Chassis 
<-> sensors. If there are sensors associated to boards with the 
"chassis" association ("all_sensors" is the reverse association), they 
would need to be moved to an inventory item chassis. I don't see any 
though unless I missed something.

[1]https://github.com/openbmc/docs/blob/919a7b6816a5f16aa72d298e81e0756d95d5031e/architecture/sensor-architecture.md#association-type-1-linking-a-chassis-to-all-sensors-within-the-chassis

[2]https://github.com/search?q=org%3Aopenbmc+all_sensors&type=code

[3]https://github.com/openbmc/openbmc/blob/c3d88e4d9fcc08e1aae7cc9d0337c0261e996c64/meta-quanta/meta-gbs/recipes-phosphor/inventory/phosphor-inventory-manager/associations.json#L389