netdev - Re: [stable] [PATCH] sfc: Fix efx_rx_buf

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Date:	Thu, 19 Sep 2013 13:43:44 -0400 (EDT)
From:	David Miller <davem@...emloft.net>
To:	bhutchings@...arflare.com
Cc:	stable@...r.kernel.org, netdev@...r.kernel.org
Subject: Re: [stable] [PATCH] sfc: Fix efx_rx_buf_offset() for recycled
 pages

From: Ben Hutchings <bhutchings@...arflare.com>
Date: Thu, 19 Sep 2013 17:13:51 +0100

> This bug fix is only for stable branches older than 3.10.  The bug was
> fixed upstream by commit 2768935a4660 ('sfc: reuse pages to avoid DMA
> mapping/unmapping costs'), but that change is totally unsuitable for
> stable.
> 
> Commit b590ace09d51 ('sfc: Fix efx_rx_buf_offset() in the presence of
> swiotlb') added an explicit page_offset member to struct
> efx_rx_buffer, which must be set consistently with the u.page and
> dma_addr fields.  However, it failed to add the necessary assignment
> in efx_resurrect_rx_buffer().  It also did not correct the calculation
> of efx_rx_buffer::dma_addr in efx_resurrect_rx_buffer(), which assumes
> that DMA-mapping a page will result in a page-aligned DMA address
> (exactly what swiotlb violates).
> 
> Add the assignment of efx_rx_buffer::page_offset and change the
> calculation of dma_addr to make use of it.

No objections.
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