DPDK Support for New HW Offloads
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This document discusses DPDK support for new hardware offloads. It describes the Netronome Agilio SmartNIC, which has hardware accelerators and can offload tasks like cryptography and flow processing. It discusses using the SmartNIC with DPDK and OVS for improved performance over kernel-based solutions. Full flow classification and action offloading to the SmartNIC is proposed to reduce CPU usage, along with exploring eBPF/XDP offloading possibilities and virtio offloading to enable VM migration.
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DPDK Support for New HW Offloads
- 1. DPDK Summit - San Jose – 2017 DPDK support for new hw offloads #DPDKSummit Alejandro Lucero, Netronome
- 2. 2#DPDKSummit DPDK support for new hw offloads Netronome Agilio SmartNIC: a highly programmable card designed for network packet/flow processing ● 120 Flow Processing cores ● Hardware accelerators: crypto, hash, queue, LB, TM ● Hardware offloads: checksum, VLAN, TSO, IPSec, …, OVS, eBPF, P4, Contrail vROUTER, virtio ● 10G, 25G, 40G, 100G ● Up to quad PCIe Gen3x8
- 3. 3 DPDK support for new hw offloads OVS VM virtio-net kernel user OVS-kernelvhost-net Orchestrator HW NIC driver NIC VM virtio-netVM virtio-netVM virtio-net OVS KERNEL
- 4. 4 DPDK support for new hw offloads OVS VM virtio-net kernel user OVS-kernel Orchestrator HW NFP PF netdev VM virtio-netVM virtio-netVM NFP driver OVS KERNEL OFFLOAD VF VF VF VF OVS PF Repr netdev NFP WIRE TC Repr netdev Repr netdev Repr netdev Flow offload
- 5. 5 DPDK support for new hw offloads OVS kernel user OVS-kernel Orchestrator HW NFP PF netdev VM virtio-net OVS KERNEL OFFLOAD + (Netronome) XVIO VF VF VF VF OVS PF Repr netdev NFP WIRE TC Repr netdev Repr netdev Repr netdev PMD PMD PMD VM virtio-net VM virtio-net XVIO-DPDK vhost-user ... ... Flow offload
- 6. 6 DPDK support for new hw offloads OVS-DPDK: ● Better performance than (kernel) OVS ● Consumes CPU in the Host. Scalable?
- 7. 7 DPDK support for new hw offloads OVS-DPDK VM virtio-net kernel user Orchestrator HW PMD NIC VM virtio-net VM virtio-net VM virtio-net OVS-DPDK V H O S T
- 8. 8 DPDK support for new hw offloads OVS-DPDK VM virtio-net kernel user Orchestrator HW PMD NIC VM virtio-net VM virtio-net VM virtio-net OVS-DPDK & SR-IOV V H O S T PMD PMD... VF VF VF...
- 9. 9 DPDK support for new hw offloads OVS-DPDK: offload? ● Partial offload proposed in the OVS mailing list (just classification giving hints for action to OVS) ● Full (classification + action) Offload? Does it make sense? ○ VMs using SR-IOV (native NIC performance) ○ OVS-DPDK needs CPUs. With offload CPU just for slow path ○ Different tenants, different service: virtio AND SR-IOV ○ Security ○ Just experimental work done (Netronome)
- 10. 10 DPDK support for new hw offloads VM virtio-n et kernel user Orchestrator HW NFP PF PMD VM virtio-n et VM virtio-n et VM NFP driver OVS-DPDK FULL OFFLOAD VF VF VF VF OVS PF Repr PMD NFP WIRE Repr PMD Repr PMD ... OVS-DPDK
- 11. 11 DPDK support for new hw offloads kernel user Orchestrator HW NFP PF PMD VM virtio-n et VM virtio-n et VM NFP driver OVS- DPDK FULL OFFLOAD (optional) VF VF VF VF OVS PF Repr PMD NFP WIRE Repr PMD Repr PMD ... OVS-DPDK v h o s t VM virtio-net container container
- 12. 12 DPDK support for new hw offloads V-PMD rx_pkt_burst M-PMD V-PMD rx_pkt_burst V-PMD rx_pkt_burst V-PMD rx_pkt_burst ... Virtual ports (Representors) packet delivery (slow path) enqueue burst enqueue burst dequeue burst dequeue burst dequeue burst dequeue burst RTE RING LIBRARY RXRING RXRING RXRING RXRING Representors Multiplexed PF PMD based on metadata
- 13. 13 DPDK support for new hw offloads OVS-DPDK Offload: what is needed? ● Representors PMDs could be created inside PF PMDs, but ... ○ hotplug/unplug: representors are not PCI devices ○ Transparency: representors naming ○ Who is taking over the PF? Bifurcated driver? ● OVS Flow rules offload? ○ Changes to OVS-DPDK? Using TC through PF? ○ Is rte_flow enough for OVS flows syntax?
- 14. 14 DPDK support for new hw offloads eBPF offload BPF: Berkeley Packet Filter (tcpdump, libpcap, netfilter) Kernel executes BPF programs via in-kernel virtual machine eBPF: extended BPF. Sockets filtering and tracing (since 3.18) Attaching eBPF programs to kernel TC classifier (since 4.1) XDP: eXpress Data Path
- 15. 15 DPDK support for new hw offloads XDP (eXpress Data Path) in the Linux kernel Bare metal packet processing at the lowest point in the software stack It does not require any specialized hardware It does not required kernel bypass It does not replace the TCP/IP stack It works in concert with TCP/IP stack along with all the benefits of BPF (eBPF)
- 16. 16 DPDK support for new hw offloads
- 17. 17 DPDK support for new hw offloads XDP/eBPF & DPDK Do we need XDP/eBPF in userspace networking? How to do it? Good for being “kernel compatible”: executing eBPF/XDP programs, but … Can eBPF-DPDK be eBPF-kernel compatible? Likely good for any DPDK-based network stack Support at PMD level with offload option It is already possible (with limitations) to use eBPF in userspace
- 18. 18 DPDK support for new hw offloads eBPF Offload XDP consume host resources (CPU, PCIe bandwidth) Netronome’s Agilio SmartNIC: Packet processing through eBPF programs with hardware offload IO Visor: eBPF to the extreme
- 19. 19 DPDK support for new hw offloads Userspace Network Stack NIC HW eBPF program XDP DROP, FORWARD HOST CPU Userspace Network Stack NIC HW XDP DROP, FORWARD eBPFPCIe PCIe NFP NIC DRIVER NIC DRIVER Kernel eBPF Offload
- 20. 20 DPDK support for new hw offloads virtio Offload: virtio capable NIC ● VMs with SR-IOV (device passthrough) but using virtio interface ○ Pros: VM provisioning, performance ○ Cons: VM migration, East-West traffic ● VM migration: requires a migration friendly NIC ● East-West traffic: memory vs NIC ● DPDK: virtio changes (vhost), iommu changes???? ● Other option: vDPA (vHost Data Path Acceleration)
- 21. 21 Dataplane Acceleration Developer Day (DXDD) ▪ Date: December 11-12 (Monday & Tuesday) ▪ Time: 8:30 a.m. – 8:00 p.m. ▪ Location: Computer Science Museum (Mountain View, CA) ▪ Why should you attend? • Discussions about recent dataplane acceleration development – P4-16 introduction – TC offload introduction – eBPF introduction • Extensive hands-on training – P4-14 labs – TC labs ▪ Register: https://open-nfp.org/dxdd-2017
- 22. 22 DPDK support for new hw offloads Questions?