Data storage system employing service infrastructure for functional modules

A data storage system includes interface circuitry receiving data storage requests and sending corresponding responses to data storage clients, and data storage devices providing non-volatile storing and retrieval of client data in response to the data storage requests. Processing circuitry executes software-implemented datapath modules that realize datapath functions to process the data storage requests and responses, as well as service infrastructure modules to realize a service infrastructure to provide for regularized communications among the datapath modules, including Notify, Monitor, and StartIO communications. Each datapath module registers with the service infrastructure to establish links into corresponding sub-modules that handle the Notify, Monitor, and Start IO communications, and each datapath module invokes a respective sub-module of another datapath module by performing regularized Notify, Monitor, and Start IO functions of the service infrastructure with an identification of the target datapath module which is to receive the corresponding regularized communication.