Drop the iommu source

It was deprecated in v0.10.0.

docs/get-started/features.md

@@ -144,14 +144,6 @@ See the full list in [github.com/klauspost/cpuid][klauspost-cpuid].
 | RDTl2CA   | Intel L2 Cache Allocation Technology
 | RDTMBA    | Intel Memory Bandwidth Allocation (MBA) Technology
 
-### IOMMU (deprecated)
-
-| Feature             | Value | Description
-| ------------------- | ----- | -----------
-| **`iommu.enabled`** | true  | IOMMU is present and enabled in the kernel
-
-**DEPRECATED**: The **iommu** source is deprecated and not enabled by default.
-
 ### Kernel
 
 | Feature | Value  | Description

docs/get-started/introduction.md

@@ -61,7 +61,6 @@ Feature discovery is divided into domain-specific feature sources:
 - USB
 - Custom (rule-based custom features)
 - Local (hooks for user-specific features)
-- IOMMU (*deprecated*)
 
 Each feature source is responsible for detecting a set of features which. in
 turn, are turned into node feature labels.  Feature labels are prefixed with

pkg/nfd-client/worker/nfd-worker-internal_test.go

@@ -317,7 +317,7 @@ func TestNewNfdWorker(t *testing.T) {
 			So(worker.configure("", ""), ShouldBeNil)
 			Convey("all sources should be enabled and the whitelist regexp should be empty", func() {
 				So(len(worker.featureSources), ShouldEqual, len(source.GetAllFeatureSources())-1)
-				So(len(worker.labelSources), ShouldEqual, len(source.GetAllLabelSources())-2)
+				So(len(worker.labelSources), ShouldEqual, len(source.GetAllLabelSources())-1)
 				So(worker.config.Core.LabelWhiteList, ShouldResemble, emptyRegexp)
 			})
 		})

pkg/nfd-client/worker/nfd-worker.go

@@ -43,7 +43,6 @@ import (
 	_ "sigs.k8s.io/node-feature-discovery/source/cpu"
 	_ "sigs.k8s.io/node-feature-discovery/source/custom"
 	_ "sigs.k8s.io/node-feature-discovery/source/fake"
-	_ "sigs.k8s.io/node-feature-discovery/source/iommu"
 	_ "sigs.k8s.io/node-feature-discovery/source/kernel"
 	_ "sigs.k8s.io/node-feature-discovery/source/local"
 	_ "sigs.k8s.io/node-feature-discovery/source/memory"

source/iommu/iommu.go

@@ -1,65 +0,0 @@
-/*
-Copyright 2018-2021 The Kubernetes Authors.
-
-Licensed under the Apache License, Version 2.0 (the "License");
-you may not use this file except in compliance with the License.
-You may obtain a copy of the License at
-
-    http://www.apache.org/licenses/LICENSE-2.0
-
-Unless required by applicable law or agreed to in writing, software
-distributed under the License is distributed on an "AS IS" BASIS,
-WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-See the License for the specific language governing permissions and
-limitations under the License.
-*/
-
-package iommu
-
-import (
-	"fmt"
-	"io/ioutil"
-
-	"sigs.k8s.io/node-feature-discovery/source"
-)
-
-// Name of this feature source
-const Name = "iommu"
-
-// iommuSource implements the LabelSource interface.
-type iommuSource struct{}
-
-func (s *iommuSource) Name() string { return Name }
-
-// Singleton source instance
-var (
-	src iommuSource
-	_   source.LabelSource = &src
-)
-
-// Priority method of the LabelSource interface
-func (s *iommuSource) Priority() int { return 0 }
-
-// GetLabels method of the LabelSource interface
-func (s *iommuSource) GetLabels() (source.FeatureLabels, error) {
-	features := source.FeatureLabels{}
-
-	// Check if any iommu devices are available
-	devices, err := ioutil.ReadDir(source.SysfsDir.Path("class/iommu/"))
-	if err != nil {
-		return nil, fmt.Errorf("failed to check for IOMMU support: %v", err)
-	}
-
-	if len(devices) > 0 {
-		features["enabled"] = true
-	}
-
-	return features, nil
-}
-
-// DisableByDefault method of the SupplementalSource interface.
-func (s *iommuSource) DisableByDefault() bool { return true }
-
-func init() {
-	source.Register(&src)
-}

source/source_test.go

@@ -28,7 +28,6 @@ import (
 	_ "sigs.k8s.io/node-feature-discovery/source/cpu"
 	_ "sigs.k8s.io/node-feature-discovery/source/custom"
 	_ "sigs.k8s.io/node-feature-discovery/source/fake"
-	_ "sigs.k8s.io/node-feature-discovery/source/iommu"
 	_ "sigs.k8s.io/node-feature-discovery/source/kernel"
 	_ "sigs.k8s.io/node-feature-discovery/source/local"
 	_ "sigs.k8s.io/node-feature-discovery/source/memory"

test/e2e/e2e-test-config.example.yaml

@@ -34,7 +34,6 @@ defaultFeatures:
     - "feature.node.kubernetes.io/cpu-rdt.RDTMBA"
     - "feature.node.kubernetes.io/cpu-rdt.RDTMBM"
     - "feature.node.kubernetes.io/cpu-rdt.RDTMON"
-    - "feature.node.kubernetes.io/iommu-enabled"
     - "feature.node.kubernetes.io/kernel-config.NO_HZ"
     - "feature.node.kubernetes.io/kernel-config.NO_HZ_FULL"
     - "feature.node.kubernetes.io/kernel-config.NO_HZ_IDLE"