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From: "Stephen  Bates" <sbates@raithlin.com>
To: Dan Williams <dan.j.williams@intel.com>,
	Logan Gunthorpe <logang@deltatee.com>
Cc: "Bjorn Helgaas" <helgaas@kernel.org>,
	"Sinan Kaya" <okaya@codeaurora.org>,
	"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
	"linux-pci@vger.kernel.org" <linux-pci@vger.kernel.org>,
	"linux-nvme@lists.infradead.org" <linux-nvme@lists.infradead.org>,
	"linux-rdma@vger.kernel.org" <linux-rdma@vger.kernel.org>,
	"linux-nvdimm@lists.01.org" <linux-nvdimm@lists.01.org>,
	"linux-block@vger.kernel.org" <linux-block@vger.kernel.org>,
	"Christoph Hellwig" <hch@lst.de>, "Jens Axboe" <axboe@kernel.dk>,
	"Keith Busch" <keith.busch@intel.com>,
	"Sagi Grimberg" <sagi@grimberg.me>,
	"Bjorn Helgaas" <bhelgaas@google.com>,
	"Jason Gunthorpe" <jgg@mellanox.com>,
	"Max Gurtovoy" <maxg@mellanox.com>,
	"Jérôme Glisse" <jglisse@redhat.com>,
	"Benjamin Herrenschmidt" <benh@kernel.crashing.org>,
	"Alex Williamson" <alex.williamson@redhat.com>
Subject: Re: [PATCH v3 01/11] PCI/P2PDMA: Support peer-to-peer memory
Date: Wed, 14 Mar 2018 19:34:53 +0000	[thread overview]
Message-ID: <AA646409-BB63-4757-A250-CE7118D4D3B8@raithlin.com> (raw)
In-Reply-To: <CAPcyv4g-A6fqdTahxX=aONSCgp1eEvBb=ZVMzbZUWUDmqBbj7Q@mail.gmail.com>

> P2P over PCI/PCI-X is quite common in devices like raid controllers.

Hi Dan 

Do you mean between PCIe devices below the RAID controller? Isn't it pretty novel to be able to support PCIe EPs below a RAID controller (as opposed to SCSI based devices)?

> It would be useful if those configurations were not left behind so
> that Linux could feasibly deploy offload code to a controller in the
> PCI domain.
   
Agreed. I think this would be great. Kind of like the XCOPY framework that was proposed a while back for SCSI devices [1] but updated to also include NVMe devices. That is definitely a use case we would like this framework to support.

Stephen
 
[1] https://lwn.net/Articles/592094/

  parent reply	other threads:[~2018-03-14 19:34 UTC|newest]

Thread overview: 68+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-03-12 19:35 [PATCH v3 00/11] Copy Offload in NVMe Fabrics with P2P PCI Memory Logan Gunthorpe
2018-03-12 19:35 ` [PATCH v3 01/11] PCI/P2PDMA: Support peer-to-peer memory Logan Gunthorpe
2018-03-13  3:28   ` Sinan Kaya
2018-03-13 16:43     ` Logan Gunthorpe
2018-03-13 17:49       ` Sinan Kaya
2018-03-13 18:44         ` Logan Gunthorpe
2018-03-13 19:10           ` Sinan Kaya
2018-03-13 19:19             ` Logan Gunthorpe
2018-03-13 19:53               ` Sinan Kaya
2018-03-13 20:46                 ` Logan Gunthorpe
2018-03-13 21:22                   ` Sinan Kaya
2018-03-13 22:00                     ` Logan Gunthorpe
2018-03-13 22:29                       ` Sinan Kaya
2018-03-13 22:45                         ` Stephen  Bates
2018-03-13 22:48                         ` Logan Gunthorpe
2018-03-13 23:19                           ` Sinan Kaya
2018-03-13 23:45                             ` Logan Gunthorpe
2018-03-14 12:16                               ` David Laight
2018-03-14 16:23                                 ` Logan Gunthorpe
2018-03-13 22:31                       ` Stephen  Bates
2018-03-13 23:08                         ` Bjorn Helgaas
2018-03-13 23:21                           ` Logan Gunthorpe
2018-03-14  2:56                             ` Bjorn Helgaas
2018-03-14 14:05                               ` Stephen  Bates
2018-03-14 16:17                               ` Logan Gunthorpe
2018-03-14 18:51                                 ` Bjorn Helgaas
2018-03-14 19:03                                   ` Logan Gunthorpe
2018-03-14 19:28                                     ` Dan Williams
2018-03-14 19:30                                       ` Logan Gunthorpe
2018-03-14 19:34                                       ` Stephen  Bates [this message]
2018-03-15  4:00                                         ` Martin K. Petersen
2018-03-15  4:30                                         ` Dan Williams
2018-03-22 22:57                           ` Stephen  Bates
2018-03-23 21:50                             ` Bjorn Helgaas
2018-03-23 21:59                               ` Logan Gunthorpe
2018-03-24  3:49                                 ` Bjorn Helgaas
2018-03-24 15:28                                   ` Stephen  Bates
2018-03-26 15:43                                     ` Logan Gunthorpe
2018-03-26 11:11       ` Jonathan Cameron
2018-03-26 14:01         ` Bjorn Helgaas
2018-03-26 15:46           ` Logan Gunthorpe
2018-03-27  8:47             ` Jonathan Cameron
2018-03-27 15:37               ` Logan Gunthorpe
2018-04-13 21:56               ` Stephen  Bates
2018-03-26 16:41         ` Jason Gunthorpe
2018-03-26 17:30           ` Logan Gunthorpe
2018-03-26 19:35             ` Jason Gunthorpe
2018-03-26 20:42               ` Logan Gunthorpe
2018-03-13 18:40     ` Logan Gunthorpe
2018-03-12 19:35 ` [PATCH v3 02/11] PCI/P2PDMA: Add sysfs group to display p2pmem stats Logan Gunthorpe
2018-03-12 19:35 ` [PATCH v3 03/11] PCI/P2PDMA: Add PCI p2pmem dma mappings to adjust the bus offset Logan Gunthorpe
2018-03-12 19:35 ` [PATCH v3 04/11] PCI/P2PDMA: Clear ACS P2P flags for all devices behind switches Logan Gunthorpe
2018-03-12 19:35 ` [PATCH v3 05/11] PCI/P2PDMA: Add P2P DMA driver writer's documentation Logan Gunthorpe
2018-03-12 19:41   ` Jonathan Corbet
2018-03-12 21:18     ` Logan Gunthorpe
2018-03-12 19:35 ` [PATCH v3 06/11] block: Introduce PCI P2P flags for request and request queue Logan Gunthorpe
2018-03-21  9:27   ` Christoph Hellwig
2018-03-12 19:35 ` [PATCH v3 07/11] IB/core: Ensure we map P2P memory correctly in rdma_rw_ctx_[init|destroy]() Logan Gunthorpe
2018-03-21  9:27   ` Christoph Hellwig
2018-03-12 19:35 ` [PATCH v3 08/11] nvme-pci: Use PCI p2pmem subsystem to manage the CMB Logan Gunthorpe
2018-03-13  1:55   ` Sinan Kaya
2018-03-13  1:58     ` Sinan Kaya
2018-03-12 19:35 ` [PATCH v3 09/11] nvme-pci: Add support for P2P memory in requests Logan Gunthorpe
2018-03-21  9:23   ` Christoph Hellwig
2018-03-12 19:35 ` [PATCH v3 10/11] nvme-pci: Add a quirk for a pseudo CMB Logan Gunthorpe
2018-03-12 19:35 ` [PATCH v3 11/11] nvmet: Optionally use PCI P2P memory Logan Gunthorpe
2018-03-21  9:27   ` Christoph Hellwig
2018-03-21 16:52     ` Logan Gunthorpe

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