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authorSathya Perla <sathya.perla@emulex.com>2014-03-04 07:44:38 +0100
committerDavid S. Miller <davem@davemloft.net>2014-03-04 22:17:53 +0100
commite50287be7c007a10e6e2e3332e52466faf4b6a04 (patch)
tree7ecf4f04fe32210aba3e7c4a3f9fd0c369c619b5 /Documentation/email-clients.txt
parentMerge branch 'mpls_tc' (diff)
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be2net: dma_sync each RX frag before passing it to the stack
The driver currently maps a page for DMA, divides the page into multiple frags and posts them to the HW. It un-maps the page after data is received on all the frags of the page. This scheme doesn't work when bounce buffers are used for DMA (swiotlb=force kernel param). This patch fixes this problem by calling dma_sync_single_for_cpu() for each frag (excepting the last one) so that the data is copied from the bounce buffers. The page is un-mapped only when DMA finishes on the last frag of the page. (Thanks Ben H. for suggesting the dma_sync API!) This patch also renames the "last_page_user" field of be_rx_page_info{} struct to "last_frag" to improve readability of the fixed code. Reported-by: Li Fengmao <li.fengmao@zte.com.cn> Signed-off-by: Sathya Perla <sathya.perla@emulex.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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