Network Driver

1. A packet is received by the hardware.
2. An RX packet ready interrupt is triggered.
3. The network driver schedules an RX task to be executed.
4. The RX task is invoked when the Interrupt Service Routine (ISR) is completed.
5. The RX task process:
   • Fetches the packet's data from the hardware queue.
   • Checks for hardware errors.
   • Creates a containing logical structure for the packet, i.e. an sk_buff.
   • Initializes some helper information in the sk_buff, e.g. protocol, RX device.
   • Passes the packet up to the Linux kernel using netif_rx().
   • Handles more packets if ready.