netdev - Re: [PATCHv2 1/2] [NET] add skb_recycle_check() to enable netdriver skb recycling

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Message-ID: <20080928213824.GA25298@2ka.mipt.ru>
Date:	Mon, 29 Sep 2008 01:38:24 +0400
From:	Evgeniy Polyakov <johnpol@....mipt.ru>
To:	Lennert Buytenhek <buytenh@...tstofly.org>
Cc:	netdev@...r.kernel.org, Ram.Natarajan@...lex.Com,
	Eric Dumazet <dada1@...mosbay.com>,
	Ashish Karkare <akarkare@...vell.com>,
	Nicolas Pitre <nico@....org>
Subject: Re: [PATCHv2 1/2] [NET] add skb_recycle_check() to enable netdriver skb recycling

Hi Lennert.

On Sun, Sep 28, 2008 at 10:46:33PM +0200, Lennert Buytenhek (buytenh@...tstofly.org) wrote:
> This patch adds skb_recycle_check(), which can be used by a network
> driver after transmitting an skb to check whether this skb can be
> recycled as a receive buffer.
> 
> skb_recycle_check() checks that the skb is not shared or cloned, and
> that it is linear and its head portion large enough (as determined by
> the driver) to be recycled as a receive buffer.  If these conditions
> are met, it does any necessary reference count dropping and cleans
> up the skbuff as if it just came from __alloc_skb().

Shouldn't it also perfrom all actions kfree_skb() does except actual
freeing, since given skb can be from socket, so it may leak dst entries
and break socket memory accounting?

-- 
	Evgeniy Polyakov
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