linux-kernel - Re: alloc skb based on a given data buffer

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Message-Id: <20090915.013321.07006714.davem@davemloft.net>
Date:	Tue, 15 Sep 2009 01:33:21 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	yi.zhu@...el.com
Cc:	mel@....ul.ie, reinette.chatre@...el.com, elendil@...net.nl,
	Larry.Finger@...inger.net, linville@...driver.com,
	penberg@...helsinki.fi, linux-kernel@...r.kernel.org,
	linux-wireless@...r.kernel.org,
	ipw3945-devel@...ts.sourceforge.net, akpm@...ux-foundation.org,
	cl@...ux-foundation.org, assaf.krauss@...el.com,
	johannes@...solutions.net, mohamed.abbas@...el.com,
	netdev@...r.kernel.org
Subject: Re: alloc skb based on a given data buffer

From: Zhu Yi <yi.zhu@...el.com>
Date: Tue, 15 Sep 2009 16:30:20 +0800

> This way, device drivers can allocate the Rx buffers with their own size
> and alignment requirement. i.e. do an order-1 page allocation directly
> with free_pages() in the iwlagn driver for a 256 bytes aligned 8K Rx
> buffer. After DMA is finished, drivers can use the above function to
> assemble an skb based on the Rx buffer. It should resolve the problem
> for requiring an order-2 allocation by alloc_skb() in the first place.

You can create paged RX skbs just like drivers such as niu.c
and others already do, there is no need for special APIs for
this.
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