mirror of
https://github.com/kubernetes-sigs/node-feature-discovery.git
synced 2024-12-14 11:57:51 +00:00
81378a3235
Implement new registration infrastructure under the "source" package. This change loosens the coupling between label sources and the nfd-worker, making it easier to refactor and move the code around. Also, create a separate interface (ConfigurableSource) for configurable feature sources in order to eliminate boilerplate code. Add safety checks to the sources that they actually implement the interfaces they should. In sake of consistency and predictability (of behavior) change all methods of the sources to use pointer receivers. Add simple unit tests for the new functionality and include source/... into make test target.
134 lines
4 KiB
Go
134 lines
4 KiB
Go
/*
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Copyright 2017-2021 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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"io/ioutil"
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"os"
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"strconv"
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"strings"
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"k8s.io/klog/v2"
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"sigs.k8s.io/node-feature-discovery/source"
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)
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const Name = "network"
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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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// networkSource implements the LabelSource interface.
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type networkSource struct{}
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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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// Name returns an identifier string for this feature source.
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func (s *networkSource) Name() string { return Name }
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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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// 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 *networkSource) Discover() (source.FeatureLabels, error) {
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features := source.FeatureLabels{}
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netInterfaces, err := ioutil.ReadDir(source.SysfsDir.Path(sysfsBaseDir))
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if err != nil {
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return nil, fmt.Errorf("failed to list network interfaces: %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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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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if err != nil {
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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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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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klog.Errorf("error in obtaining maximum supported number of virtual functions for network interface: %s: %v", name, err)
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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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features["sriov.capable"] = true
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numBytes, err := ioutil.ReadFile(source.SysfsDir.Path(sysfsBaseDir, name, "device/sriov_numvfs"))
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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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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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klog.Errorf("error in obtaining the configured number of virtual functions for network interface: %s: %v", name, err)
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continue
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}
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if n > 0 {
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klog.V(1).Infof("%d virtual functions configured on network interface: %s", n, name)
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features["sriov.configured"] = true
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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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}
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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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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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func init() {
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source.Register(&src)
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}
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