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- // Copyright 2019 The Prometheus Authors
- // Licensed under the Apache License, Version 2.0 (the "License");
- // you may not use this file except in compliance with the License.
- // You may obtain a copy of the License at
- //
- // http://www.apache.org/licenses/LICENSE-2.0
- //
- // Unless required by applicable law or agreed to in writing, software
- // distributed under the License is distributed on an "AS IS" BASIS,
- // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- // See the License for the specific language governing permissions and
- // limitations under the License.
-
- package procfs
-
- import (
- "bufio"
- "bytes"
- "fmt"
- "io"
- "strconv"
- "strings"
-
- "github.com/prometheus/procfs/internal/util"
- )
-
- // For the proc file format details,
- // See:
- // * Linux 2.6.23 https://elixir.bootlin.com/linux/v2.6.23/source/net/core/dev.c#L2343
- // * Linux 2.6.39 https://elixir.bootlin.com/linux/v2.6.39/source/net/core/dev.c#L4086
- // * Linux 4.18 https://elixir.bootlin.com/linux/v4.18/source/net/core/net-procfs.c#L162
- // * Linux 5.14 https://elixir.bootlin.com/linux/v5.14/source/net/core/net-procfs.c#L169
-
- // SoftnetStat contains a single row of data from /proc/net/softnet_stat.
- type SoftnetStat struct {
- // Number of processed packets.
- Processed uint32
- // Number of dropped packets.
- Dropped uint32
- // Number of times processing packets ran out of quota.
- TimeSqueezed uint32
- // Number of collision occur while obtaining device lock while transmitting.
- CPUCollision uint32
- // Number of times cpu woken up received_rps.
- ReceivedRps uint32
- // number of times flow limit has been reached.
- FlowLimitCount uint32
- // Softnet backlog status.
- SoftnetBacklogLen uint32
- // CPU id owning this softnet_data.
- Index uint32
- // softnet_data's Width.
- Width int
- }
-
- var softNetProcFile = "net/softnet_stat"
-
- // NetSoftnetStat reads data from /proc/net/softnet_stat.
- func (fs FS) NetSoftnetStat() ([]SoftnetStat, error) {
- b, err := util.ReadFileNoStat(fs.proc.Path(softNetProcFile))
- if err != nil {
- return nil, err
- }
-
- entries, err := parseSoftnet(bytes.NewReader(b))
- if err != nil {
- return nil, fmt.Errorf("failed to parse /proc/net/softnet_stat: %w", err)
- }
-
- return entries, nil
- }
-
- func parseSoftnet(r io.Reader) ([]SoftnetStat, error) {
- const minColumns = 9
-
- s := bufio.NewScanner(r)
-
- var stats []SoftnetStat
- for s.Scan() {
- columns := strings.Fields(s.Text())
- width := len(columns)
- softnetStat := SoftnetStat{}
-
- if width < minColumns {
- return nil, fmt.Errorf("%d columns were detected, but at least %d were expected", width, minColumns)
- }
-
- // Linux 2.6.23 https://elixir.bootlin.com/linux/v2.6.23/source/net/core/dev.c#L2347
- if width >= minColumns {
- us, err := parseHexUint32s(columns[0:9])
- if err != nil {
- return nil, err
- }
-
- softnetStat.Processed = us[0]
- softnetStat.Dropped = us[1]
- softnetStat.TimeSqueezed = us[2]
- softnetStat.CPUCollision = us[8]
- }
-
- // Linux 2.6.39 https://elixir.bootlin.com/linux/v2.6.39/source/net/core/dev.c#L4086
- if width >= 10 {
- us, err := parseHexUint32s(columns[9:10])
- if err != nil {
- return nil, err
- }
-
- softnetStat.ReceivedRps = us[0]
- }
-
- // Linux 4.18 https://elixir.bootlin.com/linux/v4.18/source/net/core/net-procfs.c#L162
- if width >= 11 {
- us, err := parseHexUint32s(columns[10:11])
- if err != nil {
- return nil, err
- }
-
- softnetStat.FlowLimitCount = us[0]
- }
-
- // Linux 5.14 https://elixir.bootlin.com/linux/v5.14/source/net/core/net-procfs.c#L169
- if width >= 13 {
- us, err := parseHexUint32s(columns[11:13])
- if err != nil {
- return nil, err
- }
-
- softnetStat.SoftnetBacklogLen = us[0]
- softnetStat.Index = us[1]
- }
- softnetStat.Width = width
- stats = append(stats, softnetStat)
- }
-
- return stats, nil
- }
-
- func parseHexUint32s(ss []string) ([]uint32, error) {
- us := make([]uint32, 0, len(ss))
- for _, s := range ss {
- u, err := strconv.ParseUint(s, 16, 32)
- if err != nil {
- return nil, err
- }
-
- us = append(us, uint32(u))
- }
-
- return us, nil
- }
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