cpu: support for detecting nx-gzip coprocessor feature

Nest accelerator gzip support for IBM Power systems.

Signed-off-by: Chandan Abhyankar <Chandan.Abhyankar@ibm.com>

docs/usage/customization-guide.md

@@ -621,6 +621,8 @@ The following features are available for matching:
 |                  |              | **`enabled`** | bool  | **DEPRECATED**: use **`se.enabled`** from **`cpu.security`** instead
 | **`cpu.topology`** | attribute  |          |            | CPU topology related features
 | | |          **`hardware_multithreading`** | bool       | Hardware multithreading, such as Intel HTT, is enabled
+| **`cpu.coprocessor`** | attribute |        |            | CPU Coprocessor related features
+| | |          **`nx_gzip`**                 | bool       | Nest Accelerator GZIP support is enabled
 | **`kernel.config`** | attribute |          |            | Kernel configuration options
 |                  |              | **`<config-flag>`** | string | Value of the kconfig option
 | **`kernel.loadedmodule`** | flag |         |            | Loaded kernel modules

docs/usage/features.md

@@ -48,6 +48,7 @@ option of nfd-worker.
 | ----------------------- | ------------ | -----------
 | **`cpu-cpuid.<cpuid-flag>`**      | true   | CPU capability is supported. **NOTE:** the capability might be supported but not enabled.
 | **`cpu-hardware_multithreading`** | true   | Hardware multithreading, such as Intel HTT, enabled (number of logical CPUs is greater than physical CPUs)
+| **`cpu-coprocessor.nx_gzip`**     | true   | Nest Accelerator for GZIP is supported(Power).
 | **`cpu-power.sst_bf.enabled`**    | true   | Intel SST-BF ([Intel Speed Select Technology][intel-sst] - Base frequency) enabled
 | **`cpu-pstate.status`**           | string | The status of the [Intel pstate][intel-pstate] driver when in use and enabled, either 'active' or 'passive'.
 | **`cpu-pstate.turbo`**            | bool   | Set to 'true' if turbo frequencies are enabled in Intel pstate driver, set to 'false' if they have been disabled.

source/cpu/coprocessor_ppc64le.go

@@ -0,0 +1,43 @@
+//go:build ppc64le
+// +build ppc64le
+
+/*
+Copyright 2023 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"
+	"sigs.k8s.io/node-feature-discovery/pkg/utils/hostpath"
+	"strconv"
+)
+
+/* Detect NX_GZIP */
+func discoverCoprocessor() 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/coprocessor_stub.go

@@ -0,0 +1,24 @@
+//go:build !ppc64le
+// +build !ppc64le
+
+/*
+Copyright 2023 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 discoverCoprocessor() map[string]string {
+	return nil
+}

source/cpu/cpu.go

@@ -34,16 +34,17 @@ import (
 const Name = "cpu"
 
 const (
-	CpuidFeature    = "cpuid"
-	Cpumodel        = "model"
-	CstateFeature   = "cstate"
-	PstateFeature   = "pstate"
-	RdtFeature      = "rdt"
-	SeFeature       = "se" // DEPRECATED in v0.12: will be removed in the future
-	SecurityFeature = "security"
-	SgxFeature      = "sgx" // DEPRECATED in v0.12: will be removed in the future
-	SstFeature      = "sst"
-	TopologyFeature = "topology"
+	CpuidFeature       = "cpuid"
+	Cpumodel           = "model"
+	CstateFeature      = "cstate"
+	PstateFeature      = "pstate"
+	RdtFeature         = "rdt"
+	SeFeature          = "se" // DEPRECATED in v0.12: will be removed in the future
+	SecurityFeature    = "security"
+	SgxFeature         = "sgx" // DEPRECATED in v0.12: will be removed in the future
+	SstFeature         = "sst"
+	TopologyFeature    = "topology"
+	CoprocessorFeature = "coprocessor"
 )
 
 // Configuration file options
@@ -192,6 +193,11 @@ func (s *cpuSource) GetLabels() (source.FeatureLabels, error) {
 		labels["hardware_multithreading"] = v
 	}
 
+	// NX
+	if v, ok := features.Attributes[CoprocessorFeature].Elements["nx_gzip"]; ok {
+		labels["coprocessor.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 Coprocessor features
+	s.features.Attributes[CoprocessorFeature] = nfdv1alpha1.NewAttributeFeatures(discoverCoprocessor())
+
 	utils.KlogDump(3, "discovered cpu features:", "  ", s.features)
 
 	return nil