The Linux Kernel - RX

• The netif_rx() function performs the following:
  1. Enqueues sk_buff to the system's input queue (sometimes referred to as the "backlog").
  2. Schedules the dequeue task.
• The dequeue task performs the following:
  1. Dequeues a packet from the backlog.
  2. Sets some more information in the sk_buff, and manages some statistics.
  3. Calls OpenRG RX hooks (referred to as "knet hooks") for this packet:
     • If the hooks mechanism's answer is "handled", packet processing is stopped, otherwise it continues normally.
     • The hooks may modify every aspect of the sk_buff (especially the actual data and the "device" field) and still say "not handled". The OpenRG hooks scheme is explained in detail in section 17.4.3.
     • Passes the packet to Linux routing.