/* 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 pci import ( "fmt" "io/ioutil" "log" "os" "path" "strings" ) type pciDeviceInfo map[string]string var logger = log.New(os.Stderr, "", log.LstdFlags) type NFDConfig struct { DeviceClassWhitelist []string `json:"deviceClassWhitelist,omitempty"` } var Config = NFDConfig{ DeviceClassWhitelist: []string{"03", "0b40", "12"}, } // Implement FeatureSource interface type Source struct{} // Return name of the feature source func (s Source) Name() string { return "pci" } // Discover features func (s Source) Discover() ([]string, error) { features := map[string]bool{} devs, err := detectPci() if err != nil { return nil, fmt.Errorf("Failed to detect PCI devices: %s", err.Error()) } for class, classDevs := range devs { for _, white := range Config.DeviceClassWhitelist { if strings.HasPrefix(class, strings.ToLower(white)) { for _, dev := range classDevs { features[fmt.Sprintf("%s_%s.present", dev["class"], dev["vendor"])] = true } } } } feature_list := []string{} for feature := range features { feature_list = append(feature_list, feature) } return feature_list, nil } // Read information of one PCI device func readDevInfo(devPath string) (pciDeviceInfo, error) { info := pciDeviceInfo{} attrs := []string{"class", "vendor", "device", "subsystem_vendor", "subsystem_device"} for _, attr := range attrs { data, err := ioutil.ReadFile(path.Join(devPath, attr)) if err != nil { return info, fmt.Errorf("Failed to read device %s: %s", attr, err) } // Strip whitespace and '0x' prefix info[attr] = strings.TrimSpace(strings.TrimPrefix(string(data), "0x")) if attr == "class" && len(info[attr]) > 4 { // Take four first characters, so that the programming // interface identifier gets stripped from the raw class code info[attr] = info[attr][0:4] } } return info, nil } // List available PCI devices func detectPci() (map[string][]pciDeviceInfo, error) { const basePath = "/sys/bus/pci/devices/" devInfo := make(map[string][]pciDeviceInfo) devices, err := ioutil.ReadDir(basePath) if err != nil { return nil, err } // Iterate over devices for _, device := range devices { info, err := readDevInfo(path.Join(basePath, device.Name())) if err != nil { log.Print(err) continue } class := info["class"] devInfo[class] = append(devInfo[class], info) } return devInfo, nil }