Adding NX Gzip support for power. PR 956

Signed-off-by: Chandan Abhyankar <[email protected]>

source/cpu/cpu.go

@@ -44,6 +44,7 @@ const (
 	SgxFeature      = "sgx" // DEPRECATED in v0.12: will be removed in the future
 	SstFeature      = "sst"
 	TopologyFeature = "topology"
+        NXFeature       = "nx"
 )
 
 // Configuration file options
@@ -192,6 +193,11 @@ func (s *cpuSource) GetLabels() (source.FeatureLabels, error) {
 		labels["hardware_multithreading"] = v
 	}
 
+	// NX
+	if v, ok := features.Attributes[NXFeature].Elements["nx_gzip"]; ok {
+		labels["nx_gzip"] = v
+	}
+
 	return labels, nil
 }
 
@@ -246,6 +252,9 @@ func (s *cpuSource) Discover() error {
 	// Detect hyper-threading
 	s.features.Attributes[TopologyFeature] = nfdv1alpha1.NewAttributeFeatures(discoverTopology())
 
+	// Detect nx-gzip
+	s.features.Attributes[NXFeature] = nfdv1alpha1.NewAttributeFeatures(discoverNxGzip())
+
 	utils.KlogDump(3, "discovered cpu features:", "  ", s.features)
 
 	return nil

source/cpu/nx_ppc64le.go

@@ -0,0 +1,43 @@
+//go:build ppc64le
+// +build ppc64le
+
+/*
+Copyright 2018 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 cpu
+
+import (
+	"k8s.io/klog/v2"
+	"os"
+	"strconv"
+	"sigs.k8s.io/node-feature-discovery/pkg/utils/hostpath"
+)
+
+/* Detect NX_GZIP */
+func discoverNxGzip() map[string]string {
+	features := make(map[string]string)
+
+	nxGzipPath := hostpath.SysfsDir.Path("devices/vio/ibm,compression-v1/nx_gzip_caps")
+
+        _, err := os.Stat(nxGzipPath)
+        if err != nil {
+                klog.V(5).Infof("Failed to detect nx_gzip for Nest Accelerator: %v", err)
+        } else {
+		features["nx_gzip"] = strconv.FormatBool(true)
+        }
+
+	return features
+}

source/cpu/nx_stub.go

@@ -0,0 +1,24 @@
+//go:build !ppc64le
+// +build !ppc64le
+
+/*
+Copyright 2018 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 cpu
+
+func discoverNxGzip() map[string]string {
+	return nil
+}