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FlexTOE is a flexible, yet high-performance TCP offload engine (TOE) toSmartNICs. FlexTOE eliminates almost all host data-path TCP processing and isfully customizable. FlexTOE interoperates well with other TCP stacks, is robustunder adverse network conditions, and supports POSIX sockets.  FlexTOE focuses on data-path offload of established connections, avoidingcomplex control logic and packet buffering in the NIC. FlexTOE leveragesfine-grained parallelization of the TCP data-path and segment reordering forhigh performance on wimpy SmartNIC architectures, while remaining flexible viaa modular design. We compare FlexTOE on an Agilio-CX40 to host TCP stacks Linuxand TAS, and to the Chelsio Terminator TOE. We find that Memcached scales up to38% better on FlexTOE versus TAS, while saving up to 81% host CPU cycles versusChelsio. FlexTOE provides competitive performance for RPCs, even with wimpySmartNICs. FlexTOE cuts 99.99th-percentile RPC RTT by 3.2$\times$ and 50%versus Chelsio and TAS, respectively. FlexTOE's data-path parallelismgeneralizes across hardware architectures, improving single connection RPCthroughput up to 2.4$\times$ on x86 and 4$\times$ on BlueField. FlexTOEsupports C and XDP programs written in eBPF. It allows us to implement populardata center transport features, such as TCP tracing, packet filtering andcapture, VLAN stripping, flow classification, firewalling, and connectionsplicing.

FlexTOE: Flexible TCP Offload with Fine-Grained Parallelism