linux-kernel - Re: [PATCH v2 00/26] IB: Optimize DMA mapping

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Date:   Fri, 13 Jan 2017 21:59:32 +0000
From:   Bart Van Assche <Bart.VanAssche@...disk.com>
To:     "alex.estrin@...el.com" <alex.estrin@...el.com>,
        "dledford@...hat.com" <dledford@...hat.com>
CC:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-rdma@...r.kernel.org" <linux-rdma@...r.kernel.org>,
        "gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>
Subject: Re: [PATCH v2 00/26] IB: Optimize DMA mapping

On Fri, 2017-01-13 at 21:08 +0000, Estrin, Alex wrote:
> It didn't fix the failure... Apparently there is an issue with generic
> mapping itself. 

Hello Alex,

The generic mapping code in lib/dma-virt.c works fine with at least the rxe
driver. Additionally, as far as I can see the mapping code in lib/dma-virt.c
is identical to the mapping in drivers/infiniband/sw/rdmavt/dma.c. What is
not clear to me however is how my patches can have caused the SDMA engine
error messages? As far as I can see the code in
drivers/infiniband/hw/hfi1/sdma.c uses PCI DMA mapping operations instead of
the generic dma_virt_ops. Is that correct?

Thanks,

Bart.