Virtualization of the Programmable Data Plane for Supporting Coexistence of Multiple Network Functions
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摘要: 网络虚拟化允许多个虚拟网络在同一物理基础设施上共存，有利于未来网络技术的增量部署。然而，当前可编程数据平面提供独占的数据平面抽象难以同时支持多个网络功能，该文提出一种支持并行流水线的虚拟化可编程数据平面结构(Virtualized P4-based Programmable Data Plane architecture with Parallel Pipeline，VirtP6)，允许在单个物理设备上运行多个相互隔离的网络功能。VirtP6改变了可编程数据平面的单一流水线结构，引入并行的多个数据包处理流水线，实现了可编程数据平面的虚拟化，并保证了不同虚拟网络功能之间的资源隔离、流量隔离和访问隔离。最后，针对VirtP6的虚拟化开销、隔离性、可扩展性、网络适用性能进行实验评估。实验结果显示，与HyperP4相比，VirtP6大大降低了虚拟化开销，将延迟减少了68%，吞吐量提高了75%，具有良好的隔离性和扩展性。Abstract: Network virtualization allows multiple virtual networks to coexist on the same physical infrastructure, facilitating the incremental deployment of future network technology. However, the current programmable data plane provides exclusive data plane abstract that is difficult to support multiple network functions simultaneously. A Virtualized P4-based Programmable Data Plane architecture with Parallel Pipeline (VirtP6) is proposed, which allows multiple isolated virtual network functions to run on a single physical device. The single pipeline structure of the programmable data plane is changed. Then, multiple parallel packet processing pipelines are ensured to realize the virtualization of the programmable data plane, and resource isolation, traffic isolation and access isolation between different virtual network functions are introduced. Finally, the virtualization overhead, isolation, scalability, and network applicability of VirtP6 are evaluated. Experimental results show that compared with HyperP4, VirtP6 reduces greatly virtualization overhead, reduces latency by 68%, improves throughput by 75%, and has good isolation and scalability.
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Key words:
- Programmable data plane /
- Network virtualization /
- Parallel pipeline /
- Network function
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算法1 VirtP6管理程序结构体 struct standard_metadata_t { bit<32> virtual_function_id; } extern select_function (inout standard_metadata_t meta, in virtual_function_id VF_id) { meta.virtual_function_id = VF_id; } extern Virtual_Function_Pipeline{ Virtual_Function_Pipeline (in virtual_function_id ); } parser Parser<H, M>(packet_in b, out H parsed_hdr, inout M VF_meta, inout standard_metadata_t meta); control Ingress_Pipeline <H, M>(inout H hdr, inout M meta, inout standard_metadata_t meta); control Egress_Pipeline <H, M>(inout H hdr, inout M meta, inout standard_metadata_t meta); control Deparser<H>(packet_out b, in H hdr); package VirtP6_Pipeline (Parser<H, M> p, Ingress_Pipeline<H, M> ig, Virtual_Function_Pipeline vfp, Egress_Pipeline<H, M> eg, Deparser<H> dep); 
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算法2 网络功能流水线结构体 parser Parser<H, M>(packet_in b, out H parsed_hdr, inout M VF_meta, inout standard_metadata_t meta); control VF_Pipeline <H, M>(inout H hdr, inout M meta, inout standard_metadata_t meta); control Deparser<H>(packet_out b, in H hdr); package Virtual_Function_Pipeline( Parser<H, M> p, VF_Pipeline<IH, IM> ieg, Deparser<H> dep);
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