netdev - dma_map_page and dma_map

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Message-ID: <CAGZFCEGLhEp7+sD98-HjQFwbkVo70M2OWh29Y+yG5xwbm82obw@mail.gmail.com>
Date:	Thu, 25 Oct 2012 14:28:56 +0530
From:	ratheesh kannoth <ratheesh.ksz@...il.com>
To:	e1000-devel@...ts.sourceforge.net, netdev@...r.kernel.org
Subject: dma_map_page and dma_map_single

Hi ,

I was looking at tx_map ( igb-3.3.6  ) in igb driver. I could see that
dma_map_single is used for first buffer and dma_map_page is used for
the fragments.

What is the real difference  between these api ?  we can replace
dma_map_single with dma_map_page. then  why  we used dma_map_single
here ?.

Thanks,
Ratheesh
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