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    Subject[RFC] [PATCH 0/3] ioat: DMA engine support

    As presented in our talk at this year's OLS, the Bensley platform, which
    will be out in early 2006, will have an asyncronous DMA engine. It can be
    used to offload copies from the CPU, such as the kernel copies of received
    packets into the user buffer.

    The code consists of the following sections:
    1) The HW driver for the DMA engine device
    2) The DMA subsystem, which abstracts the HW details from users of the
    async DMA
    3) Modifications to net/ to make use of the DMA engine for receive copy
    offload:
    3a) Code to register the net stack as a "DMA client"
    3b) Code to pin and unpin pages associated with a user buffer
    3c) Code to initiate async DMA transactions in the net receive path

    Today we are releasing 2, 3a, and 3b, as well as "testclient", a throwaway
    driver we wrote to demonstrate the DMA subsystem API. We will be releasing
    3c shortly. We will be releasing 1 (the HW driver) when the platform ships
    early next year. Until then, the code doesn't really *do* anything, but we
    wanted to release what we could right away, and start getting some
    feedback.

    Against 2.6.14:
    patch 1: DMA engine
    patch 2: iovec pin/unpin code; register net as a DMA client
    patch 3: testclient

    overall diffstat information:
    drivers/Kconfig | 2
    drivers/Makefile | 1
    drivers/dma/Kconfig | 40 ++
    drivers/dma/Makefile | 5
    drivers/dma/cb_list.h | 12
    drivers/dma/dmaengine.c | 394 ++++++++++++++++++++++++
    drivers/dma/testclient.c | 132 ++++++++
    include/linux/dmaengine.h | 268 ++++++++++++++++
    net/core/Makefile | 3
    net/core/dev.c | 78 ++++
    net/core/user_dma.c | 422 ++++++++++++++++++++++++++
    11 files changed, 1356 insertions(+), 1 deletion(-)

    Regards -- Andy and Chris



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