Network plugin binding API: Support CNI plugins #10568

ormergi · 2023-10-15T09:02:53Z

What this PR does / why we need it:
This PR implement the Network binding plugin API's Pod Creation & Definition integration point [1], enable invoking CNIs to configure virt-launcher pod network namespace.

How it works:
Similar to secondary networks, the binding plugin CNI is invoked by Multus, its necessary to define a NetworkAttachmentDefiniton for the bidning plugin.
Kubevirt will add the requested binding plugin NetworkAttachmentDefiniton to virt-launcher pod's Multus network selection annotation.
When the pod is created, its CNI chain will be invoked including the required binding plugin CNI.

How to use:
Given a network binding plugin 'dummy' that require invoking CNI.

Create NetworkAttachmentDefinition with the CNI(s) config for the binding plugin:

apiVersion: k8s.cni.cncf.io/v1
kind: NetworkAttachmentDefinition
metadata:
  name: network-binding-dummy
spec:
  config: |
    {
      "cniVersion":"0.3.1",
      "name": "network-binding-dummy",
      "plugins": [
          {   
              "type": "templatecni"
          }
      ]
    }

templatecni source [2]

Enable network binding plugins feature and register the plugin and its NetwrokAttachmentDefinition in Kubevirt config:

  apiVersion: kubevirt.io/v1
  kind: KubeVirt
  metadata:
    name: kubevirt
    namespace: kubevirt
  spec:
    configuration:
      developerConfiguration:
        featureGates:
        - NetworkBindingPlugins
      network:
        binding:
          dummy:
            networkAttachmentDefinition: dummy-net-binding
. . .

Specify the binding in the VM spec:

apiVersion: kubevirt.io/v1
kind: VirtualMachineInstance
metadata:
  name: vmi-dummy-cni
spec:
  domain:
    devices:
      interfaces:
        - name: mgmt
          binding:
            name: dummy
. . .

virt-launcher pod's Multus network selection annotation include the required binding NetworkAttachmentDefinition :

apiVersion: v1
kind: Pod
metadata:
  name: virt-launcher-vmi-dummy-cni-jjphk
  annotations:
    kubectl.kubernetes.io/default-container: compute
    kubevirt.io/domain: vmi-dummy-cni
    k8s.v1.cni.cncf.io/networks: '[
       . . . 
       {"name":"network-binding-dummy","namespace":"default","interface":"pod4ccb1906e14"},
    ]'
. . .

[1] Network binding plugin API design: https://docs.google.com/document/d/13fLaqZuM8El_CT5XzxPv-1epKsB1-Spv_jtXveEkkdQ#heading=h.qcw5usdbc0nx
[2] templatecni source: https://github.com/EdDev/template-cni

Which issue(s) this PR fixes (optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close the issue(s) when PR gets merged):
Fixes #

Special notes for your reviewer:
Last commit fixes virt-controller vmi_test.go unit tests, it required some more changes thus moved to new commit.

Checklist

This checklist is not enforcing, but it's a reminder of items that could be relevant to every PR.
Approvers are expected to review this list.

Design: A design document was considered and is present (link) or not required
PR: The PR description is expressive enough and will help future contributors
Code: Write code that humans can understand and Keep it simple
Refactor: You have left the code cleaner than you found it (Boy Scout Rule)
Upgrade: Impact of this change on upgrade flows was considered and addressed if required
Testing: New code requires new unit tests. New features and bug fixes require at least on e2e test
Documentation: A user-guide update was considered and is present (link) or not required. You want a user-guide update if it's a user facing feature / API change.
Community: Announcement to kubevirt-dev was considered

Release note:

Network binding plugin API support CNIs, new integration point on virt-launcher pod creation.

EdDev

Reviewed the 1st two commits.

EdDev · 2023-10-15T09:54:48Z

staging/src/kubevirt.io/api/core/v1/types.go

@@ -2675,6 +2675,11 @@ type InterfaceBindingPlugin struct {
 	// The sidecar handles (libvirt) domain configuration and optional services.
 	// version: 1alphav1
 	SidecarImage string `json:"sidecarImage,omitempty"`
+	// NetworkAttachmentDefinition References to a NetworkAttachmentDefinition CRD object.


references to a NetworkAttachmentDefinition CR object.

EdDev · 2023-10-15T09:56:53Z

staging/src/kubevirt.io/api/core/v1/types.go

@@ -2675,6 +2675,11 @@ type InterfaceBindingPlugin struct {
 	// The sidecar handles (libvirt) domain configuration and optional services.
 	// version: 1alphav1
 	SidecarImage string `json:"sidecarImage,omitempty"`
+	// NetworkAttachmentDefinition References to a NetworkAttachmentDefinition CRD object.
+	// Format: <networkName>, <namespace>/<networkName>.


networkName is confusing, I would suggest to make it a simple name.

EdDev · 2023-10-15T10:32:48Z

pkg/virt-controller/services/multus_annotations.go

+				if err != nil {
+					return "", err
+				}
+				multusNetworkAnnotationPool.add(*bindingPluginAnnotationData)


This is suppose to come immediately after the "base" CNI, not after all of the previous ones.

I am also unsure if it is correct to pass podInterfaceName in. Have we defined in the design that the way to correlate between the CNI and the network is the pod interface name?

This is suppose to come immediately after the "base" CNI, not after all of the previous ones.

I dont think there is difference as long as the "base" CNI invoked before the plugin CNI, right after the "base" or after other interfaces CNIs.
Anyhow I dont mind moving it, fixed.

I am also unsure if it is correct to pass podInterfaceName in

It seems that it wont work for CNIs that relays on it and config already exising interface with the same name.
I changed it to pass CNI args with the pod interface name for now.

I dont think there is difference as long as the "base" CNI invoked before the plugin CNI, right after the "base" or after other interfaces CNIs

There is a difference: Resources will not be allocated for the next interface if the current injected CNI fails to configure the pod. It will also allow potential collisions to be detected in the correct order (in case the binding CNI/s touch some shared thing).

EdDev · 2023-10-15T10:59:35Z

pkg/virt-controller/services/template_test.go

@@ -1161,6 +1161,50 @@ var _ = Describe("Template", func() {
 					},
 				),
 			)
+			When("NetworkBindingPlugins feature enabled", func() {


There has been no logic change in template.go, so I would not expect these tests to be added here.

All logic seems to have been added to multus_annotations.go. Can you test it in that context?

Tests moved to multus_annotation_test.go

EdDev

We are missing e2e tests, which IMO are a must when we touch the public API.

EdDev · 2023-10-15T11:29:37Z

pkg/virt-controller/watch/vmi_test.go

I am unclear what code we are testing here as a unit.
At the VMI controller logic, I do not think we changed anything. We changed lower level logic which can be validated as a smaller unit.

These are no new tests, those changes adapt the existing tests to the new code changes, that is GenerateMultusCNIAnnotationdepends on virtconfig.ClusterConfig

Sorry, I do not understand why there is a need to update the annotations in a different way due to the changes in this PR. Please explain what did not work, because I would expect everything to keep on working as is without us needing to change anything, except perhaps the function signature.

Ok, now I understand.
I agree with @AlonaKaplan on her comment [1], that would probably solve the distributed changes in these tests and clarify why it was needed.

AlonaKaplan · 2023-10-15T14:49:50Z

Tiny typo in the NAd name - netwotk-binding-dummy (both in the NAD and the pod defenition).

…gin API Example: Given a bidning name 'dummy' and a NetworkAttachmentDefinition named 'dummy-net-binding', Kubevirt config should be set as follows: --- apiVersion: kubevirt.io/v1 kind: KubeVirt metadata: name: kubevirt namespace: kubevirt spec: configuration: developerConfiguration: featureGates: - NetworkBindingPlugins network: binding: dummy: networkAttachmentDefinition: dummy-net-binding ... In follow-up commits, the registered net-attach-def will be added to the VM virt-launcher pod's Multus network CNI annotation. Signed-off-by: Or Mergi <ormergi@redhat.com>

AlonaKaplan · 2023-10-15T16:10:02Z

pkg/virt-controller/services/multus_annotations.go

 }

-func GenerateMultusCNIAnnotationFromNameScheme(namespace string, interfaces []v1.Interface, networks []v1.Network, networkNameScheme map[string]string) (string, error) {
+func GenerateMultusCNIAnnotationFromNameScheme(namespace string, interfaces []v1.Interface, networks []v1.Network, networkNameScheme map[string]string, config *virtconfig.ClusterConfig) (string, error) {


I think this method is used when an interface is hotplugged as well.

As we don't support hotplugging a side car, I don't think that in this stage we should support hotplugging a CNI.

Isn't the hotplug limited to the core bridge binding?

As we don't support hotplugging a side car, I don't think that in this stage we should support hotplugging a CNI.

Done, I had to do some refactoring around multus annotation generating code to enable more granularity,
see the last commit.

Isn't the hotplug limited to the core bridge binding?

It is, but since the pod may end up with additional interface

It is, but since the pod may end up with additional interface

I do not understand what this means.
What is the reasoning for complicating the code flow at this stage? (I am commenting here before looking at the changes)

In case of interface hotplug where the interface specifies a binding plugin and the plugin has a NAD registered, virt controller VMI controller will the pod Multus annotation and it will have the binding NAD.

Isn't the hotplug limited to the core bridge binding?

@EdDev yes, it is limited. But once you have a bridge interface to hotplug, the whole network annotation for all the interface will be recalculated.
We have special code for SRIOV to avoid adding not plugged SRIOV interfaces to the annotation. We can add the same for plugin binding,

EDIT: On the other hand, virt-controller won't copy binding plugin interface from the VM to the VMI (same as for any other binding that is not bridge or SRIOV) so I think Eddy is right. Nothing should be done.

I'm confused.
We are not doing this for other bindings, e.g. masquerade, macvtap, passt, etc. We are not filtering them, and I do not understand how this is different.

We already depend on something else to filter the requests.
The only reason we had the SR-IOV check is that it depends on the actual state. That is a different logic.

So, if you think this is really needed, I would expect this to be done to all other binding types.

AlonaKaplan · 2023-10-15T16:31:54Z

pkg/virt-controller/services/template_test.go

+						{Name: "blue"}, {Name: "red"}}
+				})
+
+				It("should add network binding plugin net-attach-def to multus annotation", func() {


I would also add a test for a ns/name nad name.
And as Eddy said, the test fit more mutlus_annotations_test.go.

EdDev

I have passed though all commits except the last.

EdDev · 2023-10-16T10:14:58Z

pkg/virt-controller/services/multus_annotations.go

+				if err != nil {
+					return "", err
+				}
+				multusNetworkAnnotationPool.add(*bindingPluginAnnotationData)


I dont think there is difference as long as the "base" CNI invoked before the plugin CNI, right after the "base" or after other interfaces CNIs

There is a difference: Resources will not be allocated for the next interface if the current injected CNI fails to configure the pod. It will also allow potential collisions to be detected in the correct order (in case the binding CNI/s touch some shared thing).

EdDev · 2023-10-16T10:23:34Z

pkg/virt-controller/services/multus_annotations.go

+			if iface := vmispec.LookupInterfaceByName(interfaces, network.Name); iface.Binding != nil {
+				podIfaceName := networkNameScheme[network.Name]
+				bindingPluginAnnotationData, err := newBindingPluginMultusAnnotationData(
+					config.GetConfig(), iface.Binding.Name, namespace, podIfaceName)


You are still passing in the pod interface name, I do not understand why and how it is helpful for a general binding CNI. Why we are not passing the logical network name?

Following offline discussion I changed it to the "logical" network name.

EdDev · 2023-10-16T10:40:51Z

pkg/virt-controller/services/multus_annotations.go

 }

-func GenerateMultusCNIAnnotationFromNameScheme(namespace string, interfaces []v1.Interface, networks []v1.Network, networkNameScheme map[string]string) (string, error) {
+func GenerateMultusCNIAnnotationFromNameScheme(namespace string, interfaces []v1.Interface, networks []v1.Network, networkNameScheme map[string]string, config *virtconfig.ClusterConfig) (string, error) {


I'm confused.
We are not doing this for other bindings, e.g. masquerade, macvtap, passt, etc. We are not filtering them, and I do not understand how this is different.

We already depend on something else to filter the requests.
The only reason we had the SR-IOV check is that it depends on the actual state. That is a different logic.

So, if you think this is really needed, I would expect this to be done to all other binding types.

EdDev · 2023-10-16T10:42:32Z

pkg/virt-controller/services/multus_annotations.go

+		CNIArgs: &map[string]interface{}{
+			"name": podIfaceName,
+		},


This needs to be documented on the commit and PRm it defines an API between kubevirt and the custom binding CNI.

And in this context, I do not think name is expressing what is provided here. ("name" of what?)

This needs to be documented on the commit and PRm it defines an API between kubevirt and the custom binding CNI.

Done

And in this context, I do not think name is expressing what is provided here. ("name" of what?)

Changed to 'vm-network-name' following offline discussion.

EdDev · 2023-10-16T10:47:36Z

pkg/virt-controller/services/multus_annotations_test.go

+			It("should fail if the specified network binding plugin is not registered (specified in Kubevirt config)", func() {
+				kvConfig := &v1.KubeVirtConfiguration{
+					DeveloperConfiguration: &v1.DeveloperConfiguration{
+						FeatureGates: []string{"NetworkBindingPlugins"}}}
+				config, _, _ := testutils.NewFakeClusterConfigUsingKVConfig(kvConfig)


I think you should create a helper that gets a list of bindings and returns the config.

EdDev · 2023-10-16T10:51:11Z

pkg/virt-controller/services/multus_annotations_test.go

+
+			DescribeTable("should parse NetworkAttachmentDefinition name and namespace correctly, given",
+				func(netAttachDefRawName, expectedAnnot string) {
+					vmi.Spec.Networks = []v1.Network{*v1.DefaultPodNetwork()}


I do not think we should use a common setup and then in one incident override it completely.
The common setup should consist of the common things, then you can modify it in each test.
If there is no common setup, then pass it to each test or use helpers to call them from the tests.

EdDev · 2023-10-16T10:56:24Z

pkg/virt-controller/watch/vmi_test.go

Sorry, I do not understand why there is a need to update the annotations in a different way due to the changes in this PR. Please explain what did not work, because I would expect everything to keep on working as is without us needing to change anything, except perhaps the function signature.

AlonaKaplan · 2023-10-16T12:48:18Z

pkg/virt-controller/services/multus_annotations.go

+func newBindingPluginMultusAnnotationData(kvConfig *v1.KubeVirtConfiguration, pluginName, namespace, networkName string) (*networkv1.NetworkSelectionElement, error) {
+	plugin := netbinding.ReadNetBindingPluginConfiguration(kvConfig, pluginName)
+	if plugin == nil {
+		return nil, fmt.Errorf("couldnt find network binding plugin '%s' in Kubevirt configuration", pluginName)


s/couldnt/couldn't

Fixed, rephrased to "unable to find..."

AlonaKaplan · 2023-10-16T13:09:03Z

pkg/virt-controller/watch/vmi_test.go

@@ -3359,7 +3361,13 @@ var _ = Describe("VirtualMachineInstance watcher", func() {
 						Name:          "blue",
 						NetworkSource: v1.NetworkSource{Multus: &virtv1.MultusNetwork{NetworkName: "blue-net"}}}}

-					pod = NewPodForVirtualMachine(vmi, k8sv1.PodRunning, testPodNetworkStatus...)
+					pod = NewPodForVirtualMachine(vmi, k8sv1.PodRunning)


Please introduce NewPodForVirtualMachineWithMutlusAnnotations method instead of copy pasting it multiple times.

EdDev · 2023-10-16T13:05:42Z

pkg/virt-controller/services/multus_annotations.go

+		Namespace: netAttachDefNamespace,
+		Name:      netAttachDefName,
+		CNIArgs: &map[string]interface{}{
+			"vm-network-name": networkName,


This will become a formal API between kubevirt and its binding CNI(s).
I think it needs to be a constant with a good description. In the future, it should probably be elevated to a binding API package.

EdDev · 2023-10-16T13:09:02Z

pkg/virt-controller/services/multus_annotations.go

+func newBindingPluginMultusAnnotationData(kvConfig *v1.KubeVirtConfiguration, pluginName, namespace, networkName string) (*networkv1.NetworkSelectionElement, error) {
+	plugin := netbinding.ReadNetBindingPluginConfiguration(kvConfig, pluginName)
+	if plugin == nil {
+		return nil, fmt.Errorf("couldnt find network binding plugin '%s' in Kubevirt configuration", pluginName)


nit: couldn't or could not or my preferred one: unable to find the network ...

Add the specified network binding plugin NetworkAttachmentDefinition to the VM virt-launcher pod's Multus annotation. If no NetworkAttachmentDefinition is registered (specified in Kubevirt config) its a no-op. This change enable invoking additional CNI chains on virt-launcher pod before it starts along others using network the binding plugin API. Kubevirt adds the registered NetAttachDef to the VM pod Multus network selection annotation, along with CNI args that includes the subject interface logical network name. The binding plugin CNI (specified in the binding plugin NetAttachDef) should read the logical-network-name CNI arg to realize which logical network it should modify. virt-controller vmi unit tests will be adapted to new changes in follow-up commit. Signed-off-by: Or Mergi <ormergi@redhat.com>

Generating multus annotations now depends on cluster config. Passing the tests cluster config to NewPodForVirtualMachine makes it cumbersome and requires changing all the tests that use it. Thus, introduce new factory for creating pod with multus annotations. The tests fake cluster config is moved to global scope to enable access for tests the needs it; tests that generates multus annotations. Signed-off-by: Or Mergi <ormergi@redhat.com>

EdDev

Thank you!

AlonaKaplan · 2023-10-16T15:44:30Z

pkg/virt-controller/watch/vmi_test.go

@@ -3284,8 +3284,11 @@ var _ = Describe("VirtualMachineInstance watcher", func() {
 					appendNetworkToVMI(
 						api.NewMinimalVMI(vmName), firstVMNetwork, firstVMInterface),
 					secondVMNetwork, secondVMInterface)
-				pod = NewPodForVirtualMachine(vmi, k8sv1.PodRunning)
-				Expect(pod.Annotations).To(HaveKey(networkv1.NetworkAttachmentAnnot))


No need to remove this one.

Note that this test is context of hotplug interface tests, and NewPodForVirtualMachineWithMultusAnnotations() set multus annotation on the pod.

AlonaKaplan · 2023-10-16T15:45:09Z

/approve

kubevirt-bot · 2023-10-16T15:45:17Z

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: AlonaKaplan

The full list of commands accepted by this bot can be found here.

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Needs approval from an approver in each of these files:

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kubevirt-commenter-bot · 2023-10-16T23:09:11Z

/retest-required
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Silence the bot with an /lgtm cancel or /hold comment for consistent failures.

kubevirt-commenter-bot · 2023-10-17T04:09:12Z

/retest-required
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Silence the bot with an /lgtm cancel or /hold comment for consistent failures.

ormergi · 2023-10-17T11:11:38Z

/test pull-kubevirt-e2e-k8s-1.26-sig-compute

ormergi · 2023-10-24T14:11:48Z

/cherry-pick release-1.1

kubevirt-bot · 2023-10-24T14:12:27Z

@ormergi: new pull request could not be created: failed to create pull request against kubevirt/kubevirt#release-1.1 from head kubevirt-bot:cherry-pick-10568-to-release-1.1: status code 422 not one of [201], body: {"message":"Validation Failed","errors":[{"resource":"PullRequest","code":"custom","message":"No commits between kubevirt:release-1.1 and kubevirt-bot:cherry-pick-10568-to-release-1.1"}],"documentation_url":"https://docs.github.com/rest/pulls/pulls#create-a-pull-request"}

In response to this:

/cherry-pick release-1.1

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository.

kubevirt-bot added release-note Denotes a PR that will be considered when it comes time to generate release notes. dco-signoff: yes Indicates the PR's author has DCO signed all their commits. labels Oct 15, 2023

kubevirt-bot requested review from qinqon and vladikr October 15, 2023 09:03

kubevirt-bot added size/L kind/api-change Categorizes issue or PR as related to adding, removing, or otherwise changing an API sig/network labels Oct 15, 2023

ormergi force-pushed the net-bind-api-net-attach-def branch from 9103156 to de07f0d Compare October 15, 2023 09:38

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ormergi force-pushed the net-bind-api-net-attach-def branch from de07f0d to 34fae18 Compare October 15, 2023 16:34

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ormergi force-pushed the net-bind-api-net-attach-def branch 4 times, most recently from 7215840 to 419e115 Compare October 16, 2023 09:06

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ormergi force-pushed the net-bind-api-net-attach-def branch 3 times, most recently from 7182442 to bb05870 Compare October 16, 2023 13:03

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ormergi added 2 commits October 16, 2023 18:27

ormergi force-pushed the net-bind-api-net-attach-def branch from bb05870 to 9712819 Compare October 16, 2023 15:32

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kubevirt-bot merged commit e056113 into kubevirt:main Oct 17, 2023
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ormergi deleted the net-bind-api-net-attach-def branch October 18, 2023 07:54

Network plugin binding API: Support CNI plugins #10568

Network plugin binding API: Support CNI plugins #10568

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ormergi commented Oct 15, 2023 • edited

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AlonaKaplan commented Oct 16, 2023

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kubevirt-commenter-bot commented Oct 17, 2023

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ormergi commented Oct 24, 2023

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ormergi commented Oct 15, 2023 •

edited

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