mapping address pointer to page structure

[sk.syed2]

> struct page *page = virt_to_page(skb->data);
> int offset = (unsigned long) skb->data - (unsigned long) page_address(page);
> skb_add_rx_frag(master_skb, skb_shinfo(master_skb)->nr_frags, page, offset,
> skb->len)
> .
> .
> is this the right way to do ?
This will work if skb->len < PAGE_SIZE, otherwise it means it spans
more than a page and you need to do skb_add_rx_frag for each PAGE_SIZE
data present. Refer to Understanding Linux network internals By
Christian Benvenuti p 488/489.

-syed