Function parseSoftnet

net_softnet.go:73–141

(r io.Reader)

}

func parseSoftnet(r io.Reader) ([]SoftnetStat, error) {
	const minColumns = 9

	s := bufio.NewScanner(r)

	var stats []SoftnetStat
	cpuIndex := 0
	for s.Scan() {
		columns := strings.Fields(s.Text())
		width := len(columns)
		softnetStat := SoftnetStat{}

		if width < minColumns {
			return nil, fmt.Errorf("%w: detected %d columns, but expected at least %d", ErrFileParse, 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]