Loopback strategy for TSN-compliant traffic queueing and shaping in automotive gateways

© 2021 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes,creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works.In this work, authors present a Hardware (HW)based loopback strategy which is a new paradigm in networkprocessing, for HW efficient and cost-effective integration of TimeSensitive Networking (TSN) functionalities within automotiveGateways (GWs). This innovative HW architecture permits tomanage the complexity of TSN functionalities integration withinIn-Vehicle Networks (IVNs) by reusing the already existing HWresources in GWs, interconnected in such a way that allowsto perform all the required processing, independently of theTSN algorithms in place. The proposed architecture followsthe Software Defined Networking (SDN) approach, separatingcontrol plane and data plane. The data plane is kept as simpleas possible to maximize performance and reduce latency, whilethe complexity of the different TSN algorithms integration ishandled within the control plane. Furthermore, it provides fullyautonomous management of the TSN algorithms in HW, withoutintervention of the CPU. The newly introduced loopback pathprovides the capability to send frames from the egress stage backto the processing stage, to be processed again when required,allowing also to replicate them and independently route themwherever needed by the application. The loopback is also scalable,flexible and modular allowing to interconnect as many loopbacksas required by the network device. It also allows to process framesfrom the loopback path in parallel with frames coming fromingress ports, having thus no negative impact in the throughput ofthe network device. Moreover, it has a strong focus in low latency,securing a fast track for the loopback path which allows tokeep the device performance under control, contributing towardsfuture automotive TSN-compliant networking solutions.Peer ReviewedPostprint (published version