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Time-Sensitive Networking (TSN) extends Ethernet to enable real-timecommunication, including the Credit-Based Shaper (CBS) for prioritizedscheduling and the Time-Aware Shaper (TAS) for scheduled traffic. Generally,TSN requires streams to be explicitly admitted before being transmitted. Toensure that admitted traffic conforms with the traffic descriptors indicatedfor admission control, Per-Stream Filtering and Policing (PSFP) has beendefined. For credit-based metering, well-known token bucket policers areapplied. However, time-based metering requires time-dependent switch behaviorand time synchronization with sub-microsecond precision. While TSN-capableswitches support various TSN traffic shaping mechanisms, a full implementationof PSFP is still not available. To bridge this gap, we present a P4-basedimplementation of PSFP on a 100 Gb/s per port hardware switch. We explain themost interesting aspects of the PSFP implementation whose code is available onGitHub. We demonstrate credit-based and time-based policing and synchronizationcapabilities to validate the functionality and effectiveness of P4-PSFP. Theimplementation scales up to 35840 streams depending on the streamidentification method. P4-PSFP can be used in practice as long as appropriateTSN switches lack this function. Moreover, its implementation may be helpfulfor other P4-based hardware implementations that require time synchronization.

P4-PSFP: P4-Based Per-Stream Filtering and Policing for Time-Sensitive Networking