Difference between skbuff frags and frag_list

skb_shinfo(head)->frag_list 
skb_shinfo(head)->frags[]
能区分开来吗？？？
结论就是：

• frags[] are for scatter-gather i/o buffers --nr_frags 和 frags 用于支持 Scatter/Gather I/O buffer，这样SKB的数据部分不需要都 放在线性内存空间而是放在 page.
• frag_list is for ip fragments

http://lxlenovostar.github.io/lix_blog/2016/09/29/nr_frags.html 可以看下这个 

https://stackoverflow.com/questions/10039744/difference-between-skbuff-frags-and-frag-list