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As the gap between network and CPU speeds rapidly increases, the CPU-centricnetwork stack proves inadequate due to excessive CPU and memory overhead. Whilehardware-offloaded network stacks alleviate these issues, they suffer fromlimited flexibility in both control and data planes. Offloading network stackto off-path SmartNIC seems promising to provide high flexibility; however,throughput remains constrained by inherent SmartNIC architectural limitations.  To this end, we design FlexiNS, a SmartNIC-centric network stack withsoftware transport programmability and line-rate packet processingcapabilities. To grapple with the limitation of SmartNIC-induced challenges,FlexiNS introduces: (a) a header-only offloading TX path; (b) anunlimited-working-set in-cache processing RX path; (c) a high-performanceDMA-only notification pipe; and (d) a programmable offloading engine. Weprototype FlexiNS using Nvidia BlueField-3 SmartNIC and provide out-of-the-boxRDMA IBV verbs compatibility to users. FlexiNS achieves 2.2$\times$ higherthroughput than the microkernel-based baseline in block storage disaggregationand 1.3$\times$ higher throughput than the hardware-offloaded baseline inKVCache transfer.

FlexiNS: A SmartNIC-Centric, Line-Rate and Flexible Network Stack