mirror of
https://github.com/kubernetes-sigs/node-feature-discovery.git
synced 2025-03-16 13:28:18 +00:00
15559903a0
* Format main,fake,network go source to improve GoReportCard Order of import changed in main.go and network.go, missing ending newline added in fake.go * Fixed simple golint suggestions in multiple files Mostly about missing or incomplete comments
84 lines
3.1 KiB
Go
84 lines
3.1 KiB
Go
/*
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Copyright 2017 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 network
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import (
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"bytes"
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"fmt"
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"github.com/golang/glog"
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"io/ioutil"
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"net"
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"strconv"
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"strings"
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)
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// Source implements FeatureSource.
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type Source struct{}
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// Name returns an identifier string for this feature source.
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func (s Source) Name() string { return "network" }
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// Discover returns feature names sriov-configured and sriov if SR-IOV capable NICs are present and/or SR-IOV virtual functions are configured on the node
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func (s Source) Discover() ([]string, error) {
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features := []string{}
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netInterfaces, err := net.Interfaces()
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if err != nil {
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return nil, fmt.Errorf("can't obtain the network interfaces details: %s", err.Error())
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}
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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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if strings.Contains(netInterface.Flags.String(), "up") && !strings.Contains(netInterface.Flags.String(), "loopback") {
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totalVfsPath := "/sys/class/net/" + netInterface.Name + "/device/sriov_totalvfs"
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totalBytes, err := ioutil.ReadFile(totalVfsPath)
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if err != nil {
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glog.Errorf("SR-IOV not supported for network interface: %s: %v", netInterface.Name, err)
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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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glog.Errorf("Error in obtaining maximum supported number of virtual functions for network interface: %s: %v", netInterface.Name, err)
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continue
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}
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if t > 0 {
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glog.Infof("SR-IOV capability is detected on the network interface: %s", netInterface.Name)
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glog.Infof("%d maximum supported number of virtual functions on network interface: %s", t, netInterface.Name)
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features = append(features, "sriov")
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numVfsPath := "/sys/class/net/" + netInterface.Name + "/device/sriov_numvfs"
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numBytes, err := ioutil.ReadFile(numVfsPath)
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if err != nil {
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glog.Errorf("SR-IOV not configured for network interface: %s: %s", netInterface.Name, err)
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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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glog.Errorf("Error in obtaining the configured number of virtual functions for network interface: %s: %v", netInterface.Name, err)
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continue
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}
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if n > 0 {
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glog.Infof("%d virtual functions configured on network interface: %s", n, netInterface.Name)
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features = append(features, "sriov-configured")
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break
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} else if n == 0 {
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glog.Errorf("SR-IOV not configured on network interface: %s", netInterface.Name)
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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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