where is the sk_buff allocation

[Ming Liu]

Dear all,
I am reading and understanding the Xilinx Temac device driver. I know that 
hard_start_xmit() is used to transmit the packets. In this function, a 
pointer skb which points to a sk_buff needs to be passed to show the 
location of the socket buffer. But where is that sk_buff allocation 
sentence, and how its address (skb) is passed to the hard_start_xmit() 
function? I want to change the address of the sk_buff in my system and try 
to fit this socket buffer in a pre-defined location.

Thanks for your telling.

BR
Ming

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