RE: rionet driver with MMIO DMA capability

-----Original Message-----
From: Linuxppc-dev [mailto:linuxppc-dev-
bounces+leoli=3Dfreescale.com@lists.ozlabs.org] On Behalf Of Vineeth
Sent: Wednesday, July 04, 2012 1:16 AM
To: linux-embedded@vger.kernel.org; linuxppc-dev@lists.ozlabs.org;
linuxppc-embedded@ozlabs.org; Wood Scott-B07421;
mporter@kernel.crashing.org
Cc: ranenikhil19@gmail.com
Subject: rionet driver with MMIO DMA capability
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Hi,
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With kernel mainstream version 3.5.rc-5 there's SRIO low level driver
with DMA support for MMIO. But the rionet driver in the same kernel
version doesnt support MMIO.
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We are trying to find the maximum bandwidth that we can achieve using our
custom board's(quad MPC8641 )=A0 4-lane SRIO.
Now we are worried how to use this SRIO low level driver effectively ?
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The RIOnet driver (with 3.5.-rc5) uses message based communication. This
doesnt use the DMA capability of low level driver. with this we are
getting a bandwidth of nearly 900Mbps, which is very less.
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Is there any example code or modified middle ware driver for rionet/ or
any code which uses the low level driver apis with MMIO DMA??

We provided the support for DMA in the old BSPs but didn't got the luck to =
make it upstream.  I heard Alex (CCed) is working on an upstream-able versi=
on of the feature.  Probably he can help to provide some code.

Leo