dra: test with and without immediate ReservedFor

The recommendation and default in the controller helper code is to set
ReservedFor to the pod which triggered delayed allocation. However, this
is neither required nor enforced. Therefore we should also test the fallback
path were kube-scheduler itself adds the pod to ReservedFor.

staging/src/k8s.io/dynamic-resource-allocation/controller/controller.go

@@ -50,6 +50,14 @@ import (
 type Controller interface {
 	// Run starts the controller.
 	Run(workers int)
+
+	// SetReservedFor can be used to disable adding the Pod which
+	// triggered allocation to the status.reservedFor. Normally,
+	// DRA drivers should always do that, so it's the default.
+	// But nothing in the protocol between the scheduler and
+	// a driver requires it, so at least for testing the control
+	// plane components it is useful to disable it.
+	SetReservedFor(enabled bool)
 }
 
 // Driver provides the actual allocation and deallocation operations.
@@ -146,6 +154,7 @@ type controller struct {
 	name                string
 	finalizer           string
 	driver              Driver
+	setReservedFor      bool
 	kubeClient          kubernetes.Interface
 	queue               workqueue.RateLimitingInterface
 	eventRecorder       record.EventRecorder
@@ -207,6 +216,7 @@ func New(
 		name:                name,
 		finalizer:           name + "/deletion-protection",
 		driver:              driver,
+		setReservedFor:      true,
 		kubeClient:          kubeClient,
 		rcLister:            rcInformer.Lister(),
 		rcSynced:            rcInformer.Informer().HasSynced,
@@ -232,6 +242,10 @@ func New(
 	return ctrl
 }
 
+func (ctrl *controller) SetReservedFor(enabled bool) {
+	ctrl.setReservedFor = enabled
+}
+
 func resourceEventHandlerFuncs(logger *klog.Logger, ctrl *controller) cache.ResourceEventHandlerFuncs {
 	return cache.ResourceEventHandlerFuncs{
 		AddFunc: func(obj interface{}) {
@@ -609,7 +623,7 @@ func (ctrl *controller) allocateClaims(ctx context.Context, claims []*ClaimAlloc
 		claim := claimAllocation.Claim.DeepCopy()
 		claim.Status.Allocation = claimAllocation.Allocation
 		claim.Status.DriverName = ctrl.name
-		if selectedUser != nil {
+		if selectedUser != nil && ctrl.setReservedFor {
 			claim.Status.ReservedFor = append(claim.Status.ReservedFor, *selectedUser)
 		}
 		logger.V(6).Info("Updating claim after allocation", "claim", claim)

test/e2e/dra/dra.go

@@ -179,8 +179,6 @@ var _ = ginkgo.Describe("[sig-node] DRA [Feature:DynamicResourceAllocation]", fu
 
 	ginkgo.Context("cluster", func() {
 		nodes := NewNodes(f, 1, 4)
-		driver := NewDriver(f, nodes, networkResources)
-		b := newBuilder(f, driver)
 
 		ginkgo.It("truncates the name of a generated resource claim", func(ctx context.Context) {
 			parameters := b.parameters()
@@ -213,7 +211,7 @@ var _ = ginkgo.Describe("[sig-node] DRA [Feature:DynamicResourceAllocation]", fu
 
 		// claimTests tries out several different combinations of pods with
 		// claims, both inline and external.
-		claimTests := func(allocationMode resourcev1alpha2.AllocationMode) {
+		claimTests := func(b *builder, driver *Driver, allocationMode resourcev1alpha2.AllocationMode) {
 			ginkgo.It("supports simple pod referencing inline resource claim", func(ctx context.Context) {
 				parameters := b.parameters()
 				pod, template := b.podInline(allocationMode)
@@ -322,15 +320,6 @@ var _ = ginkgo.Describe("[sig-node] DRA [Feature:DynamicResourceAllocation]", fu
 				}).WithTimeout(f.Timeouts.PodStartSlow).Should(gomega.HaveField("Status.ContainerStatuses", gomega.ContainElements(gomega.HaveField("RestartCount", gomega.BeNumerically(">=", 2)))))
 				gomega.Expect(driver.Controller.GetNumAllocations()).To(gomega.Equal(int64(1)), "number of allocations")
 			})
-		}
-
-		ginkgo.Context("with delayed allocation", func() {
-			claimTests(resourcev1alpha2.AllocationModeWaitForFirstConsumer)
-		})
-
-		ginkgo.Context("with immediate allocation", func() {
-			claimTests(resourcev1alpha2.AllocationModeImmediate)
-		})
 
 			ginkgo.It("must deallocate after use when using delayed allocation", func(ctx context.Context) {
 				parameters := b.parameters()
@@ -352,6 +341,29 @@ var _ = ginkgo.Describe("[sig-node] DRA [Feature:DynamicResourceAllocation]", fu
 					return b.f.ClientSet.ResourceV1alpha2().ResourceClaims(b.f.Namespace.Name).Get(ctx, claim.Name, metav1.GetOptions{})
 				}).WithTimeout(f.Timeouts.PodDelete).Should(gomega.HaveField("Status.Allocation", (*resourcev1alpha2.AllocationResult)(nil)))
 			})
+		}
+
+		ginkgo.Context("with delayed allocation and setting ReservedFor", func() {
+			driver := NewDriver(f, nodes, networkResources)
+			b := newBuilder(f, driver)
+			claimTests(b, driver, resourcev1alpha2.AllocationModeWaitForFirstConsumer)
+		})
+
+		ginkgo.Context("with delayed allocation and not setting ReservedFor", func() {
+			driver := NewDriver(f, nodes, func() app.Resources {
+				resources := networkResources()
+				resources.DontSetReservedFor = true
+				return resources
+			})
+			b := newBuilder(f, driver)
+			claimTests(b, driver, resourcev1alpha2.AllocationModeWaitForFirstConsumer)
+		})
+
+		ginkgo.Context("with immediate allocation", func() {
+			driver := NewDriver(f, nodes, networkResources)
+			b := newBuilder(f, driver)
+			claimTests(b, driver, resourcev1alpha2.AllocationModeImmediate)
+		})
 	})
 
 	ginkgo.Context("multiple nodes", func() {

test/e2e/dra/test-driver/app/controller.go

@@ -38,6 +38,7 @@ import (
 )
 
 type Resources struct {
+	DontSetReservedFor bool
 	NodeLocal          bool
 	Nodes              []string
 	MaxAllocations     int
@@ -80,6 +81,7 @@ func NewController(clientset kubernetes.Interface, driverName string, resources
 func (c *ExampleController) Run(ctx context.Context, workers int) {
 	informerFactory := informers.NewSharedInformerFactory(c.clientset, 0 /* resync period */)
 	ctrl := controller.New(ctx, c.driverName, c, c.clientset, informerFactory)
+	ctrl.SetReservedFor(!c.resources.DontSetReservedFor)
 	informerFactory.Start(ctx.Done())
 	ctrl.Run(workers)
 	// If we get here, the context was canceled and we can wait for informer factory goroutines.