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Offload with Corigine

Kube-OVN uses OVS for traffic forwarding in the final data plane, and the associated flow table matching, tunnel encapsulation and other functions are CPU-intensive, which consumes a lot of CPU resources and leads to higher latency and lower throughput under heavy traffic. Corigine Agilio CX series SmartNIC can offload OVS-related operations to the hardware. This technology can shorten the data path without modifying the OVS control plane, avoiding the use of host CPU resources, which dramatically reduce latency and significantly increase the throughput.

Prerequisites

  • Corigine Agilio CX series SmartNIC.
  • CentOS 8 Stream or Linux 5.7 above.
  • Since the current NIC does not support dp_hash and hash operation offload, OVN LB function should be disabled.

Setup SR-IOV

Please read Agilio Open vSwitch TC User Guide for the detail usage of this SmartNIC.

The following scripts are saved for subsequent execution of firmware-related operations:

#!/bin/bash
DEVICE=${1}
DEFAULT_ASSY=scan
ASSY=${2:-${DEFAULT_ASSY}}
APP=${3:-flower}

if [ "x${DEVICE}" = "x" -o ! -e /sys/class/net/${DEVICE} ]; then
    echo Syntax: ${0} device [ASSY] [APP]
    echo
    echo This script associates the TC Offload firmware
    echo with a Netronome SmartNIC.
    echo
    echo device: is the network device associated with the SmartNIC
    echo ASSY: defaults to ${DEFAULT_ASSY}
    echo APP: defaults to flower. flower-next is supported if updated
    echo      firmware has been installed.
    exit 1
fi

# It is recommended that the assembly be determined by inspection
# The following code determines the value via the debug interface
if [ "${ASSY}x" = "scanx" ]; then
    ethtool -W ${DEVICE} 0
    DEBUG=$(ethtool -w ${DEVICE} data /dev/stdout | strings)
    SERIAL=$(echo "${DEBUG}" | grep "^SN:")
    ASSY=$(echo ${SERIAL} | grep -oE AMDA[0-9]{4})
fi

PCIADDR=$(basename $(readlink -e /sys/class/net/${DEVICE}/device))
FWDIR="/lib/firmware/netronome"

# AMDA0081 and AMDA0097 uses the same firmware
if [ "${ASSY}" = "AMDA0081" ]; then
    if [ ! -e ${FWDIR}/${APP}/nic_AMDA0081.nffw ]; then
       ln -sf nic_AMDA0097.nffw ${FWDIR}/${APP}/nic_AMDA0081.nffw
   fi
fi

FW="${FWDIR}/pci-${PCIADDR}.nffw"
ln -sf "${APP}/nic_${ASSY}.nffw" "${FW}"

# insert distro-specific initramfs section here...

Switching firmware options and reloading the driver:

./agilio-tc-fw-select.sh ens47np0 scan
rmmod nfp
modprobe nfp

Check the number of available VFs and create VFs.

# cat /sys/class/net/ens3/device/sriov_totalvfs
65

# echo 4 > /sys/class/net/ens47/device/sriov_numvfs

Install SR-IOV Device Plugin

Since each machine has a limited number of VFs and each Pod that uses acceleration will take up VF resources, we need to use the SR-IOV Device Plugin to manage the corresponding resources so that the scheduler knows how to schedule.

Create SR-IOV Configmap:

apiVersion: v1
kind: ConfigMap
metadata:
  name: sriovdp-config
  namespace: kube-system
data:
  config.json: |
    {
      "resourceList": [{
          "resourcePrefix": "corigine.com",
          "resourceName": "agilio_sriov",
          "selectors": {
                  "vendors": ["19ee"],
                  "devices": ["6003"],
                  "drivers": ["nfp_netvf"]
              }
      }
      ]
    }

Please read the SR-IOV device plugin to deploy:

kubectl apply -f https://raw.githubusercontent.com/intel/sriov-network-device-plugin/master/deployments/k8s-v1.16/sriovdp-daemonset.yaml

Check if SR-IOV resources have been registered to Kubernetes Node:

kubectl describe no containerserver  | grep corigine

corigine.com/agilio_sriov:  4
corigine.com/agilio_sriov:  4
corigine.com/agilio_sriov  0           0

Install Multus-CNI

The device IDs obtained during SR-IOV Device Plugin scheduling need to be passed to Kube-OVN via Multus-CNI, so Multus-CNI needs to be configured to perform the related tasks.

Please read Multus-CNI Document to deploy：

kubectl apply -f https://raw.githubusercontent.com/k8snetworkplumbingwg/multus-cni/master/deployments/multus-daemonset.yml

Create NetworkAttachmentDefinition：

apiVersion: "k8s.cni.cncf.io/v1"
kind: NetworkAttachmentDefinition
metadata:
  name: default
  namespace: default
  annotations:
    k8s.v1.cni.cncf.io/resourceName: corigine.com/agilio_sriov
spec:
  config: '{
    "cniVersion": "0.3.1",
    "name": "kube-ovn",
    "plugins":[
        {
            "type":"kube-ovn",
            "server_socket":"/run/openvswitch/kube-ovn-daemon.sock",
            "provider": "default.default.ovn"
        },
        {
            "type":"portmap",
            "capabilities":{
                "portMappings":true
            }
        }
    ]
}'
  • provider: the format should be {name}.{namespace}.ovn of related NetworkAttachmentDefinition.

Enable Offload in Kube-OVN

Download the scripts:

wget https://raw.githubusercontent.com/kubeovn/kube-ovn/release-1.13/dist/images/install.sh

Change the related options，IFACE should be the physic NIC and has an IP:

ENABLE_MIRROR=${ENABLE_MIRROR:-false}
HW_OFFLOAD=${HW_OFFLOAD:-true}
ENABLE_LB=${ENABLE_LB:-false}
IFACE="ensp01"

Install Kube-OVN：

bash install.sh

Create Pods with VF NICs

Pods that use VF for network offload acceleration can be created using the following yaml:

apiVersion: v1
kind: Pod
metadata:
  name: nginx
  namespace: default
  annotations:
    v1.multus-cni.io/default-network: default/default
spec:
  containers:
    - name: nginx
      image: docker.io/library/nginx:alpine
      resources:
        requests:
          corigine.com/agilio_sriov: '1'
        limits:
          corigine.com/agilio_sriov: '1'
  • v1.multus-cni.io/default-network: should be the {namespace}/{name} of related NetworkAttachmentDefinition.

Running the following command in the ovs-ovn container of the Pod run node to observe if offload success.

# ovs-appctl dpctl/dump-flows -m type=offloaded
ufid:91cc45de-e7e9-4935-8f82-1890430b0f66, skb_priority(0/0),skb_mark(0/0),ct_state(0/0x23),ct_zone(0/0),ct_mark(0/0),ct_label(0/0x1),recirc_id(0),dp_hash(0/0),in_port(5b45c61b307e_h),packet_type(ns=0/0,id=0/0),eth(src=00:00:00:c5:6d:4e,dst=00:00:00:e7:16:ce),eth_type(0x0800),ipv4(src=0.0.0.0/0.0.0.0,dst=0.0.0.0/0.0.0.0,proto=0/0,tos=0/0,ttl=0/0,frag=no), packets:941539, bytes:62142230, used:0.260s, offloaded:yes, dp:tc, actions:54235e5753b8_h
ufid:e00768d7-e652-4d79-8182-3291d852b791, skb_priority(0/0),skb_mark(0/0),ct_state(0/0x23),ct_zone(0/0),ct_mark(0/0),ct_label(0/0x1),recirc_id(0),dp_hash(0/0),in_port(54235e5753b8_h),packet_type(ns=0/0,id=0/0),eth(src=00:00:00:e7:16:ce,dst=00:00:00:c5:6d:4e),eth_type(0x0800),ipv4(src=0.0.0.0/0.0.0.0,dst=0.0.0.0/0.0.0.0,proto=0/0,tos=0/0,ttl=0/0,frag=no), packets:82386659, bytes:115944854173, used:0.260s, offloaded:yes, dp:tc, actions:5b45c61b307e_h

If there is offloaded:yes, dp:tc content, the offloading is successful.

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