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sriov

README.md

Validating SRIOV operator

References

Instructions

  • Create a myvars file that fits your environment. You can use the myvars.example as inspiration.
  • Run the deploy.sh script

The script:

  • deploys the SRIOV operator from the operator hub (operator namespace, operator group and subscription).
  • patches the networks.operator.openshift.io/cluster object to create a dummy dhcp network in order to create a dhcp-daemon daemonset required for ipam/dhcp to work with multus (only if needed)
  • configures the VFs via the network node policy.
  • labels the workers as SRIOV capable (feature.node.kubernetes.io/network-sriov.capable: "true", customizable).
  • creates a sriovnetwork object

Ideally, the SRIOV capable NIC is attached to the 'provisioning' network, where the metal3-dnsmasq container is attached and will provide private IPs to the VFs so they can see each other.

Udev rules

The operator creates some udev rules to avoid the VFs to request IP addresses from the DHCP pool, but only for supported NICs (see the official documentation).

As a workaround for unsupported NICs and only as an experiment, a custom daemonset is created to inject the same udev rules for unsupported NICs.

Testing

The following script creates a namespace and a deployment that creates a pod on each worker with a VF attached to it.

./testing.sh

Then, you can oc rsh into the pods and see the interfaces attached to it... and see if they reach each other:

  • Observe the pods:
oc get po -n sriov-testing
NAME                          READY   STATUS    RESTARTS   AGE
sriov-test-5bb79d745f-bf98r   1/1     Running   0          49s
sriov-test-5bb79d745f-bhwmp   1/1     Running   0          56s
sriov-test-5bb79d745f-sqtk4   1/1     Running   0          49s
  • Observe the IPs for the sriov adapters:
oc get po -n sriov-testing sriov-test-5bb79d745f-bf98r -o jsonpath="{.metadata.annotations}"

map[k8s.v1.cni.cncf.io/networks:sriov-testing/sriov-network k8s.v1.cni.cncf.io/networks-status:[{
    "name": "openshift-sdn",
    "interface": "eth0",
    "ips": [
        "10.131.0.16"
    ],
    "dns": {},
    "default-route": [
        "10.131.0.1"
    ]
},{
    "name": "sriov-net",
    "interface": "net1",
    "ips": [
        "172.22.0.64"
    ],
    "mac": "02:ad:a5:2b:72:af",
    "dns": {}
}]
...
oc get po -n sriov-testing sriov-test-5bb79d745f-bhwmp -o jsonpath="{.metadata.annotations}"

map[k8s.v1.cni.cncf.io/networks:sriov-testing/sriov-network k8s.v1.cni.cncf.io/networks-status:[{
    "name": "openshift-sdn",
    "interface": "eth0",
    "ips": [
        "10.131.0.14"
    ],
    "dns": {},
    "default-route": [
        "10.131.0.1"
    ]
},{
    "name": "sriov-net",
    "interface": "net1",
    "ips": [
        "172.22.0.50"
    ],
    "mac": "52:17:eb:35:37:f7",
    "dns": {}
}]
...
  • rsh into on of them and curl ip:8080:
oc rsh -n sriov-testing sriov-test-5bb79d745f-bhwmp

$ curl 172.22.0.64:8080
Hello World!$