consume_skb 和 kfree_skb的区别

consume_skb 表示 skb是正常释放。

kfree_skb 表示因为某种错误报文被丢弃。

这只会带来某些网络统计数据上的区别，例如使用drop_watch查看有多少异常丢包的时候。

通过源码上也可以看到，两者实现基本一致，除了调用不同的统计分析函数：

trace_consume_skb, trace_kfree_skb

/*** consume_skb - free an skbuff* @skb: buffer to free** Drop a ref to the buffer and free it if the usage count has hit zero* Functions identically to kfree_skb, but kfree_skb assumes that the frame* is being dropped after a failure and notes that*/ void consume_skb(struct sk_buff *skb) {if (unlikely(!skb))return;if (likely(atomic_read(&skb->users) == 1))smp_rmb();else if (likely(!atomic_dec_and_test(&skb->users)))return;trace_consume_skb(skb);__kfree_skb(skb); } EXPORT_SYMBOL(consume_skb);/*** kfree_skb - free an sk_buff* @skb: buffer to free** Drop a reference to the buffer and free it if the usage count has* hit zero.*/ void kfree_skb(struct sk_buff *skb) {if (unlikely(!skb))return;if (likely(atomic_read(&skb->users) == 1))smp_rmb();else if (likely(!atomic_dec_and_test(&skb->users)))return;trace_kfree_skb(skb, __builtin_return_address(0));__kfree_skb(skb); } EXPORT_SYMBOL(kfree_skb);

 

总结

以上是生活随笔为你收集整理的consume_skb 和 kfree_skb的区别的全部内容，希望文章能够帮你解决所遇到的问题。

如果觉得生活随笔网站内容还不错，欢迎将生活随笔推荐给好友。