InfiniBand Network Architecture

Chapter 12. QP Verbs and QP State Machine

The Previous Chapter

The previous chapter provided a detailed discussion of how PSNs in request packets are generated by the requester QP's SQ Logic (or, in RD, the requester EEC's Send Logic) and how they are verified by the responder QP's RQ Logic (or, in RD, the responder EEC's Receive Logic). It described how the Start PSN is assigned to one QP's SQ Logic (or, in RD, one EEC's Send Logic) and the expected PSN (ePSN) is assigned to the other QP's RQ Logic (or, in RD, the other EEC's Receive Logic). It described how, when using RD, RC, and UC the PSN in each response packet is verified by the requester QP's SQ Logic (or, in RD, the requester EEC's Send Logic). The concepts of valid and invalid PSNs, ...