lb_stats->tx_bytes += skb->len;
lb_stats->tx_bytes = lb_stats->rx_bytes;
static int loopback_xmit(struct sk_buff *skb, struct net_device *dev){	struct net_device_stats *lb_stats;	skb_orphan(skb);	skb->protocol=eth_type_trans(skb,dev);	skb->dev=dev;#ifndef LOOPBACK_MUST_CHECKSUM	skb->ip_summed = CHECKSUM_UNNECESSARY;#endif#ifdef LOOPBACK_TSO	if (skb_shinfo(skb)->tso_size) {		BUG_ON(skb->protocol != htons(ETH_P_IP));		BUG_ON(skb->nh.iph->protocol != IPPROTO_TCP);		emulate_large_send_offload(skb);		return 0;	}#endif	dev->last_rx = jiffies;	lb_stats = &per_cpu(loopback_stats, get_cpu());	lb_stats->rx_bytes += skb->len;	lb_stats->tx_bytes += skb->len;	lb_stats->rx_packets++;	lb_stats->tx_packets++;	put_cpu();	netif_rx(skb);	return(0);}