net: usbnet: use new function dev_fetch_sw_netstats

void usbnet_get_stats64(struct net_device *net, struct rtnl_link_stats64 *stats)

{

	struct usbnet *dev = netdev_priv(net);

	unsigned int start;

	int cpu;

	netdev_stats_to_stats64(stats, &net->stats);

	for_each_possible_cpu(cpu) {

		struct pcpu_sw_netstats *stats64;

		u64 rx_packets, rx_bytes;

		u64 tx_packets, tx_bytes;

		stats64 = per_cpu_ptr(dev->stats64, cpu);

		do {

			start = u64_stats_fetch_begin_irq(&stats64->syncp);

			rx_packets = stats64->rx_packets;

			rx_bytes = stats64->rx_bytes;

			tx_packets = stats64->tx_packets;

			tx_bytes = stats64->tx_bytes;

		} while (u64_stats_fetch_retry_irq(&stats64->syncp, start));

		stats->rx_packets += rx_packets;

		stats->rx_bytes += rx_bytes;

		stats->tx_packets += tx_packets;

		stats->tx_bytes += tx_bytes;

	}

	dev_fetch_sw_netstats(stats, dev->stats64);

}

EXPORT_SYMBOL_GPL(usbnet_get_stats64);