One of the key selling points of SDN is decoupling the management, control planes and data plane.
Just use the Cisco solutions (DNA and ACI) as example, the controllers (DNA Center and APIC) are where the policies defined and pushed out to devices. So the controller is mostly management plane and devices are doing the heavy lifting to compile the policies to forward traffic accordingly as the data plane... So where is the control plane? I think control plane is still on the device/fabric. If we think about OSPF, it is still the devices doing the ospf calculations and populates the RIB, not the DNA Center or APIC...(SD-WAN controller actually do control plane job though). So am I wrong?
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