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

[Bart Van Assche]

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.