Question

在旧版本的linux内核（例如2.6.11）中，struct sk_buff包含指向struct sk_buff_head（命名列表）的指针。 “了解Linux网络内部”一书中说，这个指针保持不变，因为sk_buffs需要快速查找skb列表的头部。但是我在最新版本的内核（3.2.1）中找不到这样的成员。任何人都可以解释一下skb列表管理在新内核中的变化吗？

Answer 1

这很久以前改变了，在2.6.14显然。有问题的内核提交是：

commit 8728b834b226ffcf2c94a58530090e292af2a7bf
Author: David S. Miller <davem@davemloft.net>
Date:   Tue Aug 9 19:25:21 2005

    [NET]: Kill skb->list

    Remove the "list" member of struct sk_buff, as it is entirely
    redundant.  All SKB list removal callers know which list the
    SKB is on, so storing this in sk_buff does nothing other than
    taking up some space.

    Two tricky bits were SCTP, which I took care of, and two ATM
    drivers which Francois Romieu <romieu@fr.zoreil.com> fixed
    up.

    Signed-off-by: David S. Miller <davem@davemloft.net>
    Signed-off-by: Francois Romieu <romieu@fr.zoreil.com>

sk_buff_head在较新的Linux内核中丢失了

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