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An effective packet processing abstraction that leverages software orhardware acceleration techniques can simplify the implementation ofhigh-performance virtual network functions. In this paper, we explore thesuitability of SDN switches' stateful forwarding abstractions to modelaccelerated functions in both software and hardware accelerators, such asoptimized software switches and FPGA-based NICs. In particular, we select anExtended Finite State Machine abstraction and demonstrate its suitability byimplementing the Linux's iptables interface. By doing so, we provide theacceleration of functions such as stateful firewalls, load balancers anddynamic NATs. We find that supporting a flow-level programming consistencymodel is an important feature of a programming abstraction in this context.Furthermore, we demonstrate that such a model simplifies the scaling of thesystem when implemented in software, enabling efficient multi-core processingwithout harming state consistency.

Towards a Stateful Forwarding Abstraction to Implement Scalable Network Functions in Software and Hardware