mirror of
https://github.com/kubernetes-sigs/node-feature-discovery.git
synced 2025-03-17 05:48:21 +00:00
b0d0797936
User can now configure the list of device classes to detect, either via
a configuration file or by using the --options command line flag.
An example of a command line flag to detect all network controllers and
("main class 0x02) and VGA display controllers ("main" class 0x03 and
subclass 0x00) would be:
--options='{"sources": {"pci": {"deviceClassWhitelist": ["02", "0300"] } } }'
117 lines
2.9 KiB
Go
117 lines
2.9 KiB
Go
/*
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Copyright 2018 The Kubernetes Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package pci
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import (
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"fmt"
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"io/ioutil"
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"log"
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"os"
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"path"
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"strings"
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)
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type pciDeviceInfo map[string]string
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var logger = log.New(os.Stderr, "", log.LstdFlags)
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type NFDConfig struct {
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DeviceClassWhitelist []string `json:"deviceClassWhitelist,omitempty"`
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}
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var Config = NFDConfig{
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DeviceClassWhitelist: []string{"03", "0b40", "12"},
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}
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// Implement FeatureSource interface
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type Source struct{}
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// Return name of the feature source
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func (s Source) Name() string { return "pci" }
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// Discover features
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func (s Source) Discover() ([]string, error) {
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features := map[string]bool{}
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devs, err := detectPci()
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if err != nil {
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return nil, fmt.Errorf("Failed to detect PCI devices: %s", err.Error())
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}
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for class, classDevs := range devs {
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for _, white := range Config.DeviceClassWhitelist {
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if strings.HasPrefix(class, strings.ToLower(white)) {
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for _, dev := range classDevs {
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features[fmt.Sprintf("%s_%s.present", dev["class"], dev["vendor"])] = true
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}
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}
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}
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}
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feature_list := []string{}
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for feature := range features {
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feature_list = append(feature_list, feature)
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}
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return feature_list, nil
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}
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// Read information of one PCI device
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func readDevInfo(devPath string) (pciDeviceInfo, error) {
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info := pciDeviceInfo{}
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attrs := []string{"class", "vendor", "device", "subsystem_vendor", "subsystem_device"}
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for _, attr := range attrs {
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data, err := ioutil.ReadFile(path.Join(devPath, attr))
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if err != nil {
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return info, fmt.Errorf("Failed to read device %s: %s", attr, err)
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}
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// Strip whitespace and '0x' prefix
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info[attr] = strings.TrimSpace(strings.TrimPrefix(string(data), "0x"))
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if attr == "class" && len(info[attr]) > 4 {
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// Take four first characters, so that the programming
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// interface identifier gets stripped from the raw class code
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info[attr] = info[attr][0:4]
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}
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}
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return info, nil
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}
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// List available PCI devices
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func detectPci() (map[string][]pciDeviceInfo, error) {
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const basePath = "/sys/bus/pci/devices/"
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devInfo := make(map[string][]pciDeviceInfo)
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devices, err := ioutil.ReadDir(basePath)
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if err != nil {
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return nil, err
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}
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// Iterate over devices
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for _, device := range devices {
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info, err := readDevInfo(path.Join(basePath, device.Name()))
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if err != nil {
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log.Print(err)
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continue
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}
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class := info["class"]
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devInfo[class] = append(devInfo[class], info)
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}
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return devInfo, nil
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}
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