2017-11-28 14:47:11 +00:00
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/*
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2021-02-23 10:05:13 +02:00
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Copyright 2017-2021 The Kubernetes Authors.
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2017-11-28 14:47:11 +00:00
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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 network
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import (
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"bytes"
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"fmt"
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"io/ioutil"
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2021-09-10 16:18:33 +03:00
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"os"
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2017-11-28 14:47:11 +00:00
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"strconv"
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"strings"
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2018-06-21 19:02:30 +03:00
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2021-02-23 10:05:13 +02:00
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"k8s.io/klog/v2"
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2018-11-28 14:30:03 +02:00
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"sigs.k8s.io/node-feature-discovery/source"
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2017-11-28 14:47:11 +00:00
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)
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2021-05-12 16:27:29 +03:00
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const Name = "network"
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2020-05-19 21:07:23 +03:00
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// Linux net iface flags (we only specify the first few)
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const (
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flagUp = 1 << iota
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_ // flagBroadcast
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_ // flagDebug
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flagLoopback
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)
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const sysfsBaseDir = "class/net"
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2021-03-01 09:02:22 +02:00
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// networkSource implements the LabelSource interface.
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type networkSource struct{}
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2021-03-01 09:02:22 +02:00
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// Singleton source instance
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var (
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src networkSource
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_ source.LabelSource = &src
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)
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2020-04-21 22:03:37 +03:00
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2021-03-01 09:02:22 +02:00
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// Name returns an identifier string for this feature source.
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func (s *networkSource) Name() string { return Name }
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2021-03-01 09:02:22 +02:00
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// Priority method of the LabelSource interface
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func (s *networkSource) Priority() int { return 0 }
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2020-04-21 22:03:37 +03:00
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2021-03-01 18:39:49 +02:00
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// GetLabels method of the LabelSource interface
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func (s *networkSource) GetLabels() (source.FeatureLabels, error) {
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2021-03-01 07:45:32 +02:00
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features := source.FeatureLabels{}
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2020-05-19 21:07:23 +03:00
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netInterfaces, err := ioutil.ReadDir(source.SysfsDir.Path(sysfsBaseDir))
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2017-11-28 14:47:11 +00:00
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if err != nil {
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2020-05-19 21:07:23 +03:00
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return nil, fmt.Errorf("failed to list network interfaces: %s", err.Error())
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}
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2017-11-28 14:47:11 +00:00
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// iterating through network interfaces to obtain their respective number of virtual functions
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for _, netInterface := range netInterfaces {
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name := netInterface.Name()
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flags, err := readIfFlags(name)
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if err != nil {
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klog.Error(err)
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continue
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}
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if flags&flagUp != 0 && flags&flagLoopback == 0 {
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totalBytes, err := ioutil.ReadFile(source.SysfsDir.Path(sysfsBaseDir, name, "device/sriov_totalvfs"))
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2017-11-28 14:47:11 +00:00
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if err != nil {
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2021-09-10 16:18:33 +03:00
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if !os.IsNotExist(err) {
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klog.Errorf("failed to determine SR-IOV support for network interface: %s: %v", name, err)
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}
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2017-11-28 14:47:11 +00:00
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continue
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}
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total := bytes.TrimSpace(totalBytes)
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t, err := strconv.Atoi(string(total))
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if err != nil {
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2021-02-25 12:12:06 -05:00
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klog.Errorf("error in obtaining maximum supported number of virtual functions for network interface: %s: %v", name, err)
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2017-11-28 14:47:11 +00:00
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continue
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}
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if t > 0 {
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klog.V(1).Infof("SR-IOV capability is detected on the network interface: %s", name)
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klog.V(1).Infof("%d maximum supported number of virtual functions on network interface: %s", t, name)
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2018-06-21 19:02:30 +03:00
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features["sriov.capable"] = true
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numBytes, err := ioutil.ReadFile(source.SysfsDir.Path(sysfsBaseDir, name, "device/sriov_numvfs"))
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2017-11-28 14:47:11 +00:00
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if err != nil {
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klog.V(1).Infof("SR-IOV not configured for network interface: %s: %s", name, err)
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2017-11-28 14:47:11 +00:00
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continue
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}
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num := bytes.TrimSpace(numBytes)
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n, err := strconv.Atoi(string(num))
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if err != nil {
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2021-02-25 12:12:06 -05:00
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klog.Errorf("error in obtaining the configured number of virtual functions for network interface: %s: %v", name, err)
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2017-11-28 14:47:11 +00:00
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continue
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}
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if n > 0 {
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2021-02-23 10:05:13 +02:00
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klog.V(1).Infof("%d virtual functions configured on network interface: %s", n, name)
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2018-06-21 19:02:30 +03:00
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features["sriov.configured"] = true
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2017-11-28 14:47:11 +00:00
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break
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} else if n == 0 {
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klog.V(1).Infof("SR-IOV not configured on network interface: %s", name)
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2017-11-28 14:47:11 +00:00
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}
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}
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}
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}
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return features, nil
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}
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2020-05-19 21:07:23 +03:00
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func readIfFlags(name string) (uint64, error) {
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raw, err := ioutil.ReadFile(source.SysfsDir.Path(sysfsBaseDir, name, "flags"))
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if err != nil {
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return 0, fmt.Errorf("failed to read flags for interface %q: %v", name, err)
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}
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flags, err := strconv.ParseUint(strings.TrimSpace(string(raw)), 0, 64)
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if err != nil {
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return 0, fmt.Errorf("failed to parse flags for interface %q: %v", name, err)
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}
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return flags, nil
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}
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2021-03-01 09:02:22 +02:00
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func init() {
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source.Register(&src)
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}
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