netdev - Re: [PATCH net V1 2/2] net/mlx4_en: Fix pages never dma unmapped on rx

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Date:	Mon, 07 Oct 2013 06:47:09 -0700
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Amir Vadai <amirv@...lanox.com>
Cc:	"David S. Miller" <davem@...emloft.net>, netdev@...r.kernel.org,
	Or Gerlitz <ogerlitz@...lanox.com>,
	Eugenia Emantayev <eugenia@...lanox.com>,
	Eric Dumazet <edumazet@...gle.com>
Subject: Re: [PATCH net V1 2/2] net/mlx4_en: Fix pages never dma unmapped on
 rx

On Mon, 2013-10-07 at 13:38 +0200, Amir Vadai wrote:
> This patch fixes a bug introduced by commit 51151a16 (mlx4: allow
> order-0 memory allocations in RX path).
> 
> dma_unmap_page never reached because condition to detect last fragment
> in page is wrong. offset+frag_stride can't be greater than size, need to
> make sure no additional frag will fit in page => compare offset +
> frag_stride + next_frag_size instead.
> next_frag_size is the same as the current one, since page is shared only
> with frags of the same size.
> 
> CC: Eric Dumazet <edumazet@...gle.com>
> Signed-off-by: Amir Vadai <amirv@...lanox.com>
> ---
> After looking at the code again, need to use 2*frag_stride and not to look at
> size of next frag in skb. Changed it accordingly

Yes indeed this looks much better, thanks !

Acked-by: Eric Dumazet <edumazet@...gle.com>


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