mapping address pointer to page structure

[swathi suresh]

Hi All,

      Is it possible to map a address like skb->data in to struct page. My
requirement is to convert multiple skb
to a single master skb, having all the data of other skb. i.e, i want add
skb->data of multiple skb to a single skb
as the fragments. So instead of making a memcpy every time, i just call
skb_add_rx_frag

my requirement is some thing like this

*.*
*.*
*struct page *page = virt_to_page(skb->data);*
*
*
*skb_add_rx_frag(master_skb, skb_shinfo(master_skb)->nr_frags, page, off,
skb->len)*
*.*
*.*

And can some one please tell what is the use of the functions like *
virt_to_page* and *kmap_atomic_to_page*,
i tried calling virt_to_page(skb->data), but when i print the data in the
page address ( page_address(page) ) and
the data in pointed by skb->data, i came to know its mapping to a wrong
page. so can some one please explain
me what is correct way to do this.


Thanks in advance.
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