mapping address pointer to page structure

[swathi suresh]

On Wed, Mar 30, 2011 at 10:42 PM, sk.syed2 <sk.syed2 at gmail.com> wrote:

> > 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.
>

Thanks Syed, skb->len is always smaller then PAGE_SIZE because i have set
the mtu size as 1500 from my network driver.
But am facing kernel panic, if i just the moment the driver call
dev_queue_xmit, so i guess this may not  be right way to get
the page.

Anyways thanks for the support.
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