linux-kernel - Re: [PATCH] tcp: splice as many packets as possible at once

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Message-Id: <20090115.153449.204259387.davem@davemloft.net>
Date:	Thu, 15 Jan 2009 15:34:49 -0800 (PST)
From:	David Miller <davem@...emloft.net>
To:	herbert@...dor.apana.org.au
Cc:	w@....eu, jarkao2@...il.com, zbr@...emap.net, dada1@...mosbay.com,
	ben@...s.com, mingo@...e.hu, linux-kernel@...r.kernel.org,
	netdev@...r.kernel.org, jens.axboe@...cle.com
Subject: Re: [PATCH] tcp: splice as many packets as possible at once

From: Herbert Xu <herbert@...dor.apana.org.au>
Date: Fri, 16 Jan 2009 10:32:05 +1100

> On Thu, Jan 15, 2009 at 03:26:08PM -0800, David Miller wrote:
> > +static inline struct page *linear_to_page(struct page *page, unsigned int len,
> > +					  unsigned int offset)
> > +{
> > +	struct page *p = alloc_pages(GFP_KERNEL, 0);
> > +
> > +	if (!p)
> > +		return NULL;
> > +	memcpy(page_address(p) + offset, page_address(page) + offset, len);
> 
> This won't work very well if skb->head is longer than a page.
> 
> We'll need to divide it up into individual pages.

Oh yes the same bug I pointed out the other day.

But Willy can test this patch as-is, since he is not using
jumbo frames in linear SKBs.
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