skb->protocol value setting

[salve vandana <vandanasalve@yahoo.com>]

hi,

i am working in linux network device driver.
When the packet is received by the interface, the
hardware header is used only by eth_type_trans
For e.g :
skb->protocol = eth_type_trans(skb,dev)

 When the packet is received, the receiving function
is expected to correctly set
skb->protocol,skb->pkt_type and skb->mac.raw


I am not getting to know what is the reason to set 
skb->protocol field and what "eth_type_trans" does.
Actually i have seen the implementation of
"eth_type_trans" but what not getting clear.

-vandana

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