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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: remove dma_virt_ops v2
Date: Fri,  6 Nov 2020 19:19:31 +0100	[thread overview]
Message-ID: <20201106181941.1878556-1-hch@lst.de> (raw)

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

             reply	other threads:[~2020-11-06 18:20 UTC|newest]

Thread overview: 23+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-11-06 18:19 Christoph Hellwig [this message]
2020-11-06 18:19 ` [PATCH 01/10] RMDA/sw: don't allow drivers using dma_virt_ops on highmem configs Christoph Hellwig
2020-11-06 18:19 ` [PATCH 02/10] RDMA/umem: use ib_dma_max_seg_size instead of dma_get_max_seg_size Christoph Hellwig
2020-11-06 18:19 ` [PATCH 03/10] RDMA: lift ibdev_to_node from rds to common code Christoph Hellwig
2020-11-06 18:19 ` [PATCH 04/10] nvme-rdma: use ibdev_to_node instead of dereferencing ->dma_device Christoph Hellwig
2020-11-06 18:19 ` [PATCH 05/10] rds: stop using dmapool Christoph Hellwig
2020-11-06 18:19 ` [PATCH 06/10] RDMA/core: remove ib_dma_{alloc,free}_coherent Christoph Hellwig
2020-11-06 18:19 ` [PATCH 07/10] RDMA/core: remove use of dma_virt_ops Christoph Hellwig
2020-11-06 18:19 ` [PATCH 08/10] PCI/P2PDMA: Remove the DMA_VIRT_OPS hacks Christoph Hellwig
2020-11-06 18:19 ` [PATCH 09/10] PCI/P2PDMA: Cleanup __pci_p2pdma_map_sg a bit Christoph Hellwig
2020-11-06 18:19 ` [PATCH 10/10] dma-mapping: remove dma_virt_ops Christoph Hellwig
2020-11-12  9:40 ` remove dma_virt_ops v2 Christoph Hellwig
2020-11-12 13:23   ` Jason Gunthorpe
2020-11-12 17:36     ` santosh.shilimkar
2020-11-17 10:50       ` Ka-Cheong Poon
2020-11-17 19:10         ` santosh.shilimkar
2020-11-12 16:59 ` Jason Gunthorpe
2020-11-12 17:09   ` Christoph Hellwig
2020-11-12 17:39     ` Jason Gunthorpe
2020-11-13  8:50       ` Christoph Hellwig
2020-11-17 14:01         ` Mike Marciniszyn
2020-11-17 19:41 ` Jason Gunthorpe
  -- strict thread matches above, loose matches on Subject: below --
2020-11-05  7:41 Christoph Hellwig

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