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

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Message-ID: <1484689709.2729.6.camel@sandisk.com>
Date:   Tue, 17 Jan 2017 21:48:44 +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 Sat, 2017-01-14 at 02:05 +0000, Estrin, Alex wrote:
> [ ... ]
> please see hfi1/verbs.c @ hfi1_register_ib_device()  
> [ ... ]

Hello Alex,

I think I figured out what I did wrong: both the hfi1 and the qib drivers need two
sets of DMA mapping operations. ULPs have to use &dma_virt_ops and the SDMA code
has to use the PCIe DMA mapping operations. My patch series made the SDMA code use
dma_virt_ops and that's wrong. The attached patch should fix this. Unfortunately I
do not have access to a hfi1 or qib test setup. Can you help me by testing the
attached patch on top of the already posted patches?

Thanks,

Bart.
View attachment "0001-hfi1-qib-rdmavt-Use-proper-DMA-mapping-operations.patch" of type "text/x-patch" (3583 bytes)