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

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Date:	Thu, 19 Sep 2013 17:13:51 +0100
From:	Ben Hutchings <bhutchings@...arflare.com>
To:	David Miller <davem@...emloft.net>
CC:	stable <stable@...r.kernel.org>, netdev <netdev@...r.kernel.org>
Subject: [stable] [PATCH] sfc: Fix efx_rx_buf_offset() for recycled pages

[Re-sending with cc to the current stable address.  I still had the old
address in contacts, though I've definitely sent to the current address
previously...]

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.

I'm attaching the patches for 3.0.y, 3.2.y and 3.4.y (the last of which
should also be applicable to the later unofficial stable branches).

Ben.

-- 
Ben Hutchings, Staff Engineer, Solarflare
Not speaking for my employer; that's the marketing department's job.
They asked us to note that Solarflare product names are trademarked.

View attachment "sfc-Fix-efx_rx_buf_offset-for-recycled-pages-3.0.patch" of type "text/x-patch" (1833 bytes)

View attachment "sfc-Fix-efx_rx_buf_offset-for-recycled-pages-3.2.patch" of type "text/x-patch" (1878 bytes)

View attachment "sfc-Fix-efx_rx_buf_offset-for-recycled-pages-3.4.patch" of type "text/x-patch" (1889 bytes)