dev_dummy.c

来自「一个基于linux的TCP/IP协议栈的实现」· C语言 代码 · 共 55 行

/* dev.c
 * [e-mail]
 * 2006-09-09
 */

#include "dev.h"
#include "dev_dummy.h"
#include "neighbour.h"
#include "log.h"

#include <linux/smp.h>
#include <linux/net.h>
#include <linux/netdevice.h>

int netif_rx_dummy(struct sk_buff *skb)
{
	PR_DEBUG( "receive a dummy packet!\n");
	dev_put( skb->dev );
	kfree_skb( skb );
	return 0;
}

int dev_queue_xmit_dummy( struct sk_buff *skb )
{
	struct net_device *dev = skb->dev;
	int rc = -ENETDOWN;

	PR_DEBUG( "dev xmit!\n" );
	local_bh_disable();
	if( dev->flags & IFF_UP ){
		int cpu = smp_processor_id();
		if( dev->xmit_lock_owner != cpu ){
			rc = 0;
			HARD_TX_LOCK( dev, cpu );
			if( !dev->hard_start_xmit(skb, dev) ){
				HARD_TX_UNLOCK(dev);
				goto out;
			}
			HARD_TX_UNLOCK( dev );
			if( net_ratelimit() )
				PR_WARN( "Virtual device %s asks to "
								"queue packet!\n", dev->name );
		}else{
			if( net_ratelimit() )
				PR_WARN( "Dead loop on virtual device "
								"%s, fix it urgently!\n", dev->name );
		}
	}
out:
	local_bh_enable();
	return rc;
}

EXPORT_SYMBOL_GPL( dev_queue_xmit_dummy );