func setIfaceStatsFromMap(stats *wrapper.NetworkInterface, values map[string]uint64) {
	stats.RxBytes = values["rx_bytes"]
	stats.RxErrors = values["rx_errors"]
	stats.RxPackets = values["rx_packets"]
	stats.RxDropped = values["rx_dropped"]
	stats.TxBytes = values["tx_bytes"]
	stats.TxErrors = values["tx_errors"]
	stats.TxPackets = values["tx_packets"]
	stats.TxDropped = values["tx_dropped"]
}
// totalNetworkStats calculates summary of network stats (sum over all net interfaces) and returns
func totalNetworkStats(ifaceStats []wrapper.NetworkInterface) (ifaceStatsInTotal []wrapper.NetworkInterface) {
	total := wrapper.NetworkInterface{
		Name: "total",
	}

	for _, iface := range ifaceStats {
		total.RxBytes += iface.RxBytes
		total.RxPackets += iface.RxPackets
		total.RxDropped += iface.RxDropped
		total.RxErrors += iface.RxErrors
		total.TxBytes += iface.TxBytes
		total.TxPackets += iface.TxPackets
		total.TxDropped += iface.TxDropped
		total.TxErrors += iface.TxErrors
	}

	return append(ifaceStats, total)
}