netdev - Re: [PATCH]: Fix sk_buff page offsets and lengths.

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Message-ID: <20070731122329.GB11380@infradead.org>
Date:	Tue, 31 Jul 2007 13:23:29 +0100
From:	Christoph Hellwig <hch@...radead.org>
To:	Evgeniy Polyakov <johnpol@....mipt.ru>
Cc:	David Miller <davem@...emloft.net>, netdev@...r.kernel.org,
	sfr@...b.auug.org.au, shemminger@...ux-foundation.org
Subject: Re: [PATCH]: Fix sk_buff page offsets and lengths.

On Tue, Jul 31, 2007 at 02:20:51PM +0400, Evgeniy Polyakov wrote:
> On Mon, Jul 30, 2007 at 06:50:28PM -0700, David Miller (davem@...emloft.net) wrote:
> > 
> > Stephen Rothwell pointed out to me that the skb_frag_struct
> > is broken on platforms using 64K or larger page sizes, it
> > even generates warnings when (for example) the myri10ge driver
> > tries to assign PAGE_SIZE into frag->size.
> > 
> > I've thus increased page offset and size to __u32 in the patch below.
> 
> Maybe wrap it into 
> #if PAGE_OFFSET > 12
> #endif
> 
> or something like that?
> 
> I'm not sure actually why drivers would want to have list of 64k pages,
> instead driver could call give_me_pages(size) instead of alloc_pages 
> and per-arch allocator would return one page or set of pages. This is a
> handwaving for now...

What about sendfile/splice on hugetlbfs?
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