ENG. WORKSHOP: PRES. Linux Networking Greatness (part II). Roopa Prabhu/Director Engineering Linux Software/Cumulus Networks.

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2 ENG. WORKSHOP: PRES. Linux Networking Greatness (part II). Roopa Prabhu/Director Engineering Linux Software/Cumulus Networks.

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5 Disaggregation Native Linux networking (= server/host networking) Linux network operating system stacks in userspace Closed Hardware Networking acceleration from userspace 5

6 NOS architectures Native Linux networking (= server/host networking) Native linux kernel hw acceleration model Linux userspace NOS software stack driver app app app driver app Linux network operating system stacks in userspace app Hardware acceleration from userspace userspace userspace kernel kernel app driver kernel fwding and routing database driver HW HW 6

7 Disaggregated software stack Native Linux networking (= server/host TOR networking) quagga lldpd run your Native networking Linux apps hardware everywhere acceleration server model quagga lldpd Using Linux natively enables you to Fosters collaboration server quagga lldpd server quagga lldpd server quagga lldpd Linux network operating system stacks in userspace server quagga lldpd Linux Hardware deploymentsacceleration from userspace Uniform networking models across server quagga lldpd Minimize operational problems Uniform software package management server quagga lldpd server quagga lldpd server quagga lldpd server quagga lldpd 7

8 Linux Networking Communities... Native Linux networking (= server/host networking) Existing Linux Native Linux hardware acceleration New NOS model Networking Communities (netdev) Communities Linux network operating system stacks in userspace Hardware acceleration from userspace Larger Linux Networking Community Uniform Linux Networking Models Disaggregated Software Stack 8

9 Notable Linux networking updates... Native segment Linux networking (= server/host networking) routing ebpf XDP systemd Next few slides cover recent updates from Linux Linux network operating system stacks in userspace Hardware acceleration networking from communities userspace vrf sflow vxlan 9

10 Extended BPF (EBPF) Native Linux networking (= server/host networking) Efficient, generic in-kernel bytecode engine Gives Linux kernel and application superpowers Allows userspace to attach dynamic programs at various points in the kernel Users: Linux Socket network filters operating system stacks in userspace Hardware acceleration from userspace Linux traffic classifier XDP [3] Offload to programmable ASICS, and switch ASICS, NPUS [1] ebpf hooks for cgroups [2] 10

11 XDP - express Data Path Programmable, High performance, Packet processor in Linux networking datapath Native Linux networking (= server/host networking) XDP hooks with BPF programs for packet processing Target use cases: Pre-stack processing like filtering to do DOS mitigation Forwarding and Load-balancing Linux Flow sampling, network monitoring operating system stacks in userspace Hardware acceleration from userspace 11

12 tc (Linux traffic classifier) updates tc flower: flow based classifier [10 ] tc cls_bpf for a programmable classifier [11 ] tc sample for sampling packets tc hardware offload API for: switch ASICs, NPU [1] Native Linux networking (= server/host networking) Linux NICsnetwork operating system stacks in userspace Hardware acceleration from userspace 12

13 ebpf hooks for control groups (cgroups) cgroups: mainly used for Native resource Linux limiting, networking prioritization, (= accounting, server/host control networking) cgroups networking subsystems: net_cls, net_prio, namespaces ebpf hooks for cgroups: Allows for attaching ebpf programs to cgroups for network socket filtering and accounting Linux Users: network operating system stacks in userspace Hardware Containersacceleration from userspace NOS applications VRF 13

14 Virtual Routing and Forwarding updates.. Linux kernel is vrf ready [4] Systemd and vrfs Starting network services in specific vrfs ip vrf exec Start network program in a specific vrf [6 ] Native Linux networking (= server/host networking) Uses NNOS cgroup app ebpf hook [5] Linux network operating system stacks in userspace Hardware acceleration from userspace Deploying vrf with Linux made easier iproute2 updates ifupdown2 support Linux VRF on Hosts/Servers: Micro-service networking can leverage Linux vrf implementation for traffic segmentation [7] 14

15 Light Weight Tunnels Replace per tunnel netdevice with attaching tunnel attributes to routes Helps Native with Linux scaling networking tunnel endpoints (= server/host networking) More users: Native Linux hardware acceleration model VxLAN ILA (identifier locator addressing) MPLS Linux Segment network routing operating with IPv6 system stacks in userspace Hardware acceleration from userspace 15

16 Segment Routing IPV6 segment routing support [9] Native New kernel Linux API, networking data-path (= server/host networking) Userspace tools to configure SR Uses Light Weight tunnels to encapsulate SR header Linux network operating system stacks in userspace MPLS Hardware kernel data-path acceleration is SR ready from userspace MPLS segment routing [8] Uses Light Weight tunnels to encapsulate MPLS header SR control in user space in the works 16

17 Scaling VxLAN Attach tunnel parameters (tunnel-id, tunnel-src, tunnel-dst) to routes using LWT On receive, extract tunnel parameters and attach to packet Per -vlan tunnel parameters for Vxlan bridging gateway Vxlan gateway ip route add <prefix> encap vxlan vni 1000 src <s> dst <d> Vxlan bridging gateway vxlan0 bridge swp1 vxlan0 vlan: 100, 200 vni: 1000,

18 Systemd the new Linux init system A modern Linux init system for your applications A single place to manage and monitor your services Easily writable, extensible, parseable service files suitable for manipulation with enterprise management tools Service files are compatible between OS/NOS distributions Make your app systemd aware soon! Native Linux networking (= server/host networking) Linux network operating system stacks in userspace Hardware acceleration from userspace 18

19 Quagga updates Un-numbered BGP and OSPF VRF support Multicast Routing Static MPLS/LDP support EVPN (In progress) Segment Routing (In progress) Native Linux networking (= server/host networking) Linux network operating system stacks in userspace Hardware acceleration from userspace Routing on the host with Quagga validates network software stack disaggregation model 19

20 sflow Linux API for sflow monitoring: Native In pure Linux software networking (= server/host networking) Hardware offload to switch ASICs and NICs tc sampling API for sflow works across NOS s and servers Linux network operating system stacks in userspace Hardware acceleration from userspace 20

21 Resources Native Linux networking (= server/host networking) 1. ebpf HW offload: 2. ebpf for cgroups: 3. XDP: Native Linux hardware acceleration model 4. VRF tutorial: 5. VRF cgroup integration: 6. iproute2 vrf enhancements: 7. vrf on the NNOS host: app 8. Linux Linux mpls: network operating system stacks in userspace 9. Linux segment routing: tc flower Hardware acceleration from userspace 11. tc bpf pdf 21

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