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Date:   Thu, 12 Nov 2020 10:40:30 +0100
From:   Christoph Hellwig <hch@lst.de>
To:     Jason Gunthorpe <jgg@ziepe.ca>
Cc:     Bjorn Helgaas <bhelgaas@google.com>,
        Bernard Metzler <bmt@zurich.ibm.com>,
        Zhu Yanjun <yanjunz@nvidia.com>,
        Logan Gunthorpe <logang@deltatee.com>,
        Dennis Dalessandro <dennis.dalessandro@cornelisnetworks.com>,
        Mike Marciniszyn <mike.marciniszyn@cornelisnetworks.com>,
        Santosh Shilimkar <santosh.shilimkar@oracle.com>,
        linux-rdma@vger.kernel.org, rds-devel@oss.oracle.com,
        linux-pci@vger.kernel.org, iommu@lists.linux-foundation.org
Subject: Re: remove dma_virt_ops v2
Message-ID: <20201112094030.GA19550@lst.de>
References: <20201106181941.1878556-1-hch@lst.de>
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ping?

On Fri, Nov 06, 2020 at 07:19:31PM +0100, Christoph Hellwig wrote:
> Hi Jason,
> 
> this series switches the RDMA core to opencode the special case of
> devices bypassing the DMA mapping in the RDMA ULPs.  The virt ops
> have caused a bit of trouble due to the P2P code node working with
> them due to the fact that we'd do two dma mapping iterations for a
> single I/O, but also are a bit of layering violation and lead to
> more code than necessary.
> 
> Tested with nvme-rdma over rxe.
> 
> Note that the rds changes are untested, as I could not find any
> simple rds test setup.
> 
> Changes since v2:
>  - simplify the INFINIBAND_VIRT_DMA dependencies
>  - add a ib_uses_virt_dma helper
>  - use ib_uses_virt_dma in nvmet-rdma to disable p2p for virt_dma devices
>  - use ib_dma_max_seg_size in umem
>  - stop using dmapool in rds
> 
> Changes since v1:
>  - disable software RDMA drivers for highmem configs
>  - update the PCI commit logs
---end quoted text---