netif_rx kernel networking code question

I have been looking over packet flow in the kernel
online lately, and I was wondering if anyone knew, or could
help me, understand about exactly how netif_rx() and sk_buff
function. The netif_rx() function seems to load the sk_buff
struct with the packet information whenever a NIC makes
an irq request. I'm just looking for suggestion on how I
might dig deeper into this routine.


Thanks
Josh Beck