what does the kernel does after it is being notified of incoming Frame

Hello All, I was trying to search "what happen when the kernel is being notified of the incoming Frame". I studied Chapter 10. Frame Reception Of "Understanding Linux Network Internals". I only tells how the kernel is notified of the coming frame. But what does the kernel does after it is being notified. I want to dig more deep. Can you give me more references even linked videos. Thanks