阅读“了解Linux网络内部”一书后。 我开始了解我们如何从网络获取数据包的一些概念： -
> When working in interrupt driven model, the nic registers an
> interrupt handler;
> • This interrupt handler will be called when a frame is received;
> • Typically in the handler, we allocate sk buff by calling
> dev alloc skb();
> • Copies data from nic’s buffer to this struct just created;
> • nic call generic reception routine netif rx();
> • netif rx() put frame in per cpu queue;
> • if queue is full, drop!
> • net rx action() decision based on skb->protocol;
> • This function basically dequeues the frame and delivery a copy
> for every protocol handler;
> • ptype all and ptype base queues
> ip v4 rcv() will receive the ip datagram (if is a ipv4 packet);
•ip checksum, check ip headers, ....
• ip rcv finish() makes route decision (ip forward() or ip local delivery())
现在我有一些与之相关的疑问： - 关于链接http://lxr.free-electrons.com/source/net/core/dev.c#L3075上的netif_rx（）代码，代码表示它将帧传递给上层
关于net_rx_action（）http://lxr.free-electrons.com/source/net/core/dev.c#L4041哪些代码表示它需要基于skb-＆gt;协议的决定
这是什么，数据包传输过程我的意思是什么时候分配sk_buff和所有。
请指导