mirror of
https://github.com/tailscale/tailscale.git
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79 lines
1.9 KiB
Go
79 lines
1.9 KiB
Go
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// Copyright (c) Tailscale Inc & AUTHORS
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// SPDX-License-Identifier: BSD-3-Clause
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package ethtool
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import (
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"net/netip"
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"sort"
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"github.com/safchain/ethtool"
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"tailscale.com/net/interfaces"
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"tailscale.com/types/logger"
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"tailscale.com/util/set"
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)
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func ethtoolImpl(logf logger.Logf) error {
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et, err := ethtool.NewEthtool()
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if err != nil {
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logf("could not create ethtool: %v", err)
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return nil
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}
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defer et.Close()
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interfaces.ForeachInterface(func(iface interfaces.Interface, _ []netip.Prefix) {
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ilogf := logger.WithPrefix(logf, iface.Name+": ")
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features, err := et.Features(iface.Name)
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if err == nil {
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enabled := []string{}
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for feature, value := range features {
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if value {
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enabled = append(enabled, feature)
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}
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}
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sort.Strings(enabled)
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ilogf("features: %v", enabled)
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} else {
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ilogf("features: error: %v", err)
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}
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stats, err := et.Stats(iface.Name)
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if err == nil {
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printStats(ilogf, stats)
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} else {
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ilogf("stats: error: %v", err)
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}
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})
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return nil
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}
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// Stats that should be printed if non-zero
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var nonzeroStats = set.SetOf([]string{
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// AWS ENA driver statistics; see:
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// https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/monitoring-network-performance-ena.html
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"bw_in_allowance_exceeded",
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"bw_out_allowance_exceeded",
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"conntrack_allowance_exceeded",
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"linklocal_allowance_exceeded",
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"pps_allowance_exceeded",
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})
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// Stats that should be printed if zero
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var zeroStats = set.SetOf([]string{
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// AWS ENA driver statistics; see:
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// https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/monitoring-network-performance-ena.html
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"conntrack_allowance_available",
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})
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func printStats(logf logger.Logf, stats map[string]uint64) {
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for name, value := range stats {
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if value != 0 && nonzeroStats.Contains(name) {
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logf("stats: warning: %s = %d > 0", name, value)
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}
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if value == 0 && zeroStats.Contains(name) {
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logf("stats: warning: %s = %d == 0", name, value)
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}
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}
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}
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