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