SK_BUFF 内核打印调试

 

为了更方便的调试报文，需要对sk_buff的真正数据载荷进行调试输出，只需要在驱动中加入如下代码就可以调试了

static void qdmalib_dump_skb(struct sk_buff *skb, struct net_device *dev){	
	int i = 0;

	if(!skb || !dev){
		pr_err("%s: bad param\n",__FUNCTION__);
		goto out;
	}
	
	netdev_printk(KERN_INFO, dev, "TX loopback packets(data_len = %d): \n",skb->len);
	for (i = 0; i < skb->len; i++){
		if(0 == i % 8){
			printk("\t");
		}
		if(0 == i % 2){
			printk(" ");
		}

		printk("%02x", *(skb->data + i));

		if(7 == i % 8){
			printk("\n");
		}
	}
	printk("\n");

out:
	return;
}

调用者

int qdmalib_tx(struct sk_buff *skb, struct net_device *dev)
{
    ................

	qdmalib_dump_skb(skb, dev);

    ................

	return 0; 
}

输出效果