consume_skb?表示?skb是正常釋放。

kfree_skb?表示因?yàn)槟撤N錯(cuò)誤報(bào)文被丟棄。

這只會(huì)帶來某些網(wǎng)絡(luò)統(tǒng)計(jì)數(shù)據(jù)上的區(qū)別，例如使用drop_watch查看有多少異常丟包的時(shí)候。

通過源碼上也可以看到，兩者實(shí)現(xiàn)基本一致，除了調(diào)用不同的統(tǒng)計(jì)分析函數(shù)：

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);

?

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