超以太网联盟推出的新技术的SAI规范.pdf

1、Jai Kumar(Broadcom)Ravindranath Kanakarajan(Marvell)Ultra Ethernet Specifications in SAIUltra Ethernet Consortium has released set of specifications as part of UE 1.0 releaseThey are ethernet technologies for AI/ML fabricsUEC has agreed to standardized the fabric programming using OCP SAI interfaceI

2、n this presentation we will cover following set of technologies and SAI Specification enhancementsCSIG Congestion SignalingLLR-Link Layer Retry CBFC Credit Based Flow ControlUltra Ethernet Transport and Security layer and more are not yet part of todays presentationhttps:/ultraethernet.org/wp-conten

3、t/uploads/sites/20/2025/06/UE-Specification-6.11.25.pdfUltra Ethernet Consortium and OCP SAIFor each feature(CSIG,LLR,CBFC),we will go overFeature Overview Overview of SAI Spec EnhancementsList of SAI Objects,Attributes and StatsCall to ActionStructure of the talkCSIG:Congestion SignalingJai Kumar(B

4、roadcom)NETWORKINGCSIG OverviewCSIG is a UEC specification for collecting Signals from the fabric elements.These Signals can be used for Congestion Control Algorithms like NSCC,RCCC,PCM and moreTelemetry Purposescsig_tpid_compact/wide:This is the IEEE allocated ether typetype(T):This is the signal t

5、ype indicating what kind of telemetry data to collectsignal_value(S):This is the quantized value of the signal after the operation of compare and updatelocator_metadata:This field is updated by the hop that updates the signal value based on compare and update functiontrim bit(D):This bit is set if t

6、he packet undergoes TRIMCSIG is modeled as in INT technology under SAI TAM INT Object HierarchyOne TAM INT Object need to be configured for CSIG Compact Tag and another for CSIG Wide TagBinding points are Switch for switch scoped global configuration and per port for fine grain configurationACL rule