netdev - Re: [PATCH 1/2] net: num_dma

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Message-Id: <20090608.002221.128580344.davem@davemloft.net>
Date:	Mon, 08 Jun 2009 00:22:21 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	eric.dumazet@...il.com
Cc:	netdev@...r.kernel.org
Subject: Re: [PATCH 1/2] net: num_dma_maps is not used

From: David Miller <davem@...emloft.net>
Date: Fri, 05 Jun 2009 18:09:49 -0700 (PDT)

> From: Eric Dumazet <eric.dumazet@...il.com>
> Date: Fri, 05 Jun 2009 16:03:35 +0200
> 
>> Get rid of num_dma_maps in struct skb_shared_info, as it seems unused.
>> 
>> Signed-off-by: Eric Dumazet <eric.dumazet@...il.com>
> 
> It's going to be used when architectures implement optimized
> versions of skb_dma_map(), which can thus virtually map
> page vectors via IOMMU's and thus the resulting number of
> DMA address/length pairs will be smaller than (num_frags + 1)
> 
> Similarly to how dma_map_sg() works.

But we aren't doing that yet and I have no idea when I'll get
to it, so I've applied your patch for now, thanks!
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