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https://github.com/livekit/livekit.git
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57 lines
1.6 KiB
Go
57 lines
1.6 KiB
Go
// Copyright 2023 LiveKit, Inc.
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//
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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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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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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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//go:build linux
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// +build linux
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package prometheus
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import (
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"fmt"
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"github.com/florianl/go-tc"
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)
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func getTCStats() (packets, drops uint32, err error) {
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rtnl, err := tc.Open(&tc.Config{})
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if err != nil {
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err = fmt.Errorf("could not open rtnetlink socket: %v", err)
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return
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}
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defer rtnl.Close()
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qdiscs, err := rtnl.Qdisc().Get()
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if err != nil {
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err = fmt.Errorf("could not get qdiscs: %v", err)
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return
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}
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for _, qdisc := range qdiscs {
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// Newer kernels report stats via TCA_STATS2 (Stats2), while older kernels
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// only populate the legacy TCA_STATS attribute (Stats). Prefer Stats2 and
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// fall back to Stats so counters are collected on both.
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//
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// However, go-tc (through v0.4.8 and current main) mis-parses the nested TCA_STATS2
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// as a flat struct, so Stats2.Packets/.Drops are garbage. The legacy
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// TCA_STATS blob is a real flat struct and is parsed correctly, and modern
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// kernels populate BOTH — so prefer Stats.
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if qdisc.Stats != nil {
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packets += qdisc.Stats.Packets
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drops += qdisc.Stats.Drops
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}
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}
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return
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}
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