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Subjectis eth header is not transmitted

In the function ip_build_xmit(), immediately after
sk_alloc_send_skb(), skb_reserve(skb, hh_len) is called. Now
skb_reserve(skb,len) only increment the data pointer and tail pointer by
len amt.

Now in a particular hard_start_xmit() say for rtl8139, the data
transfer is taking place from skb->data :
outl(virt_to_bus(skb->data), ioaddr + TxAddr0 + entry*4)

So, I cannot understand, if transfer starts from data and not head, is
ethrnet header not transmitted? what I am missing?


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