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node-feature-discovery/source/pci/pci.go
Markus Lehtonen b0d0797936 Add config support for the pci feature source
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"] } } }'
2018-10-10 12:36:20 +03:00

117 lines
2.9 KiB
Go

/*
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
}