source/pci: Group identical PCI entries

Signed-off-by: Oleg Zhurakivskyy <[email protected]>

Author: ozhuraki

Diff for: source/pci/utils.go

@@ -17,6 +17,8 @@ limitations under the License.
 package pci
 
 import (
+	"bytes"
+	"encoding/json"
 	"fmt"
 	"os"
 	"path/filepath"
@@ -68,6 +70,11 @@ func readPciDevInfo(devPath string) (*nfdv1alpha1.InstanceFeature, error) {
 	return nfdv1alpha1.NewInstanceFeature(attrs), nil
 }
 
+type DevGroupedEntry struct {
+	Count int
+	Bytes []byte
+}
+
 // detectPci detects available PCI devices and retrieves their device attributes.
 // An error is returned if reading any of the mandatory attributes fails.
 func detectPci() ([]nfdv1alpha1.InstanceFeature, error) {
@@ -80,13 +87,35 @@ func detectPci() ([]nfdv1alpha1.InstanceFeature, error) {
 
 	// Iterate over devices
 	devInfo := make([]nfdv1alpha1.InstanceFeature, 0, len(devices))
+	devGrouped := make(map[string]map[string]DevGroupedEntry)
 	for _, device := range devices {
 		info, err := readPciDevInfo(filepath.Join(sysfsBasePath, device.Name()))
 		if err != nil {
 			klog.ErrorS(err, "failed to read PCI device info")
 			continue
 		}
-		devInfo = append(devInfo, *info)
+
+		b, err := json.Marshal(info.Attributes)
+		if err != nil {
+			return nil, err
+		}
+
+		if entry, ok := devGrouped[info.Attributes["vendor"]][info.Attributes["device"]]; !ok {
+			devGrouped[info.Attributes["vendor"]] = make(map[string]DevGroupedEntry)
+			devGrouped[info.Attributes["vendor"]][info.Attributes["device"]] = DevGroupedEntry{Bytes: b, Count: 1}
+			devInfo = append(devInfo, *info)
+		} else {
+			result := bytes.Compare(b, devGrouped[info.Attributes["vendor"]][info.Attributes["device"]].Bytes)
+			if result == 0 {
+				entry.Count += 1
+				devGrouped[info.Attributes["vendor"]][info.Attributes["device"]] = entry
+			}
+		}
+	}
+
+	for _, dev := range devInfo {
+		entry := devGrouped[dev.Attributes["vendor"]][dev.Attributes["device"]]
+		dev.Attributes["count"] = string(entry.Count)
 	}
 
 	return devInfo, nil