From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751279AbeCIFIq (ORCPT ); Fri, 9 Mar 2018 00:08:46 -0500 Received: from esa1.hgst.iphmx.com ([68.232.141.245]:60358 "EHLO esa1.hgst.iphmx.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751159AbeCIFIn (ORCPT ); Fri, 9 Mar 2018 00:08:43 -0500 X-IronPort-AV: E=Sophos;i="5.47,443,1515427200"; d="scan'208";a="176282712" From: Bart Van Assche To: "linux-kernel@vger.kernel.org" , "linux-block@vger.kernel.org" , "linux-rdma@vger.kernel.org" , "sagi@grimberg.me" , "sbates@raithlin.com" , "logang@deltatee.com" , "linux-nvdimm@lists.01.org" , "linux-nvme@lists.infradead.org" , "linux-pci@vger.kernel.org" CC: "alex.williamson@redhat.com" , "jgg@mellanox.com" , "hch@lst.de" , "martin.petersen@oracle.com" , "axboe@kernel.dk" , "dan.j.williams@intel.com" , "jglisse@redhat.com" , "maxg@mellanox.com" , "bhelgaas@google.com" , "keith.busch@intel.com" , "benh@kernel.crashing.org" Subject: Re: [PATCH v2 08/10] nvme-pci: Add support for P2P memory in requests Thread-Topic: [PATCH v2 08/10] nvme-pci: Add support for P2P memory in requests Thread-Index: AQHTsO2vHottGvceZEGvyZV9CHYkK6O7OSyAgABRTQCAC90FgA== Date: Fri, 9 Mar 2018 05:08:36 +0000 Message-ID: <1520572115.11647.3.camel@wdc.com> References: <20180228234006.21093-1-logang@deltatee.com> <20180228234006.21093-9-logang@deltatee.com> <1CE68E79-E5FD-4EE2-BD88-B3EE57E43ACE@raithlin.com> In-Reply-To: <1CE68E79-E5FD-4EE2-BD88-B3EE57E43ACE@raithlin.com> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: authentication-results: spf=none (sender IP is ) smtp.mailfrom=Bart.VanAssche@wdc.com; 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x-microsoft-antispam-message-info: jXyHEjds0y5EDfno0swrh5X0YG5NV7MtcA+88BsA9GC7i0Sr9MxxxKRC6SrgHnIqJtOwAFxJK0Mm2+VJQft8bN421AuHJ53Ceuilh9ZDdpQ1AQByrhL1zs1w7MlPXR2TAXJQ+uz217B/N7uCZtB187rU4ySVtXsdYloGlai1v7/odUjtJT3fbE3+GvmF4gtbF17vn/o44MEjcHyI8iMgRYbwHKesmHlMwO2yPfKNyG/WQMbKi+F2elFgS8pLo9W46Boy1EqpQAXC4+Syl8eae2TOsK93QR6P6KCov2ztJV1+ZWDyDO5QJdPWelk5oYkLt45nsDLk9EEwBa//ZbffLg== spamdiagnosticoutput: 1:99 spamdiagnosticmetadata: NSPM Content-Type: text/plain; charset="utf-8" Content-ID: MIME-Version: 1.0 X-OriginatorOrg: wdc.com X-MS-Exchange-CrossTenant-Network-Message-Id: 26207f53-a75a-4c69-6545-08d5857bd0a9 X-MS-Exchange-CrossTenant-originalarrivaltime: 09 Mar 2018 05:08:37.0089 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: b61c8803-16f3-4c35-9b17-6f65f441df86 X-MS-Exchange-Transport-CrossTenantHeadersStamped: MWHPR04MB0975 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Transfer-Encoding: 8bit X-MIME-Autoconverted: from base64 to 8bit by mail.home.local id w295981G018041 On Thu, 2018-03-01 at 15:58 +0000, Stephen Bates wrote: > > Any plans adding the capability to nvme-rdma? Should be > > straight-forward... In theory, the use-case would be rdma backend > > fabric behind. Shouldn't be hard to test either... > > Nice idea Sagi. Yes we have been starting to look at that. Though again we > would probably want to impose the "attached to the same PCIe switch" rule > which might be less common to satisfy in initiator systems. > > Down the road I would also like to discuss the best way to use this P2P > framework to facilitate copies between NVMe namespaces (on both PCIe and > fabric attached namespaces) without having to expose the CMB up to user > space. Wasn't something like that done in the SCSI world at some point > Martin? Are you perhaps referring to the following patch series: "Copy Offload" (https://www.spinics.net/lists/linux-scsi/msg74680.html / https://lwn.net/Articles/592094/)? I will contact Martin off-list and in case he wouldn't have the time myself to revive that patch series then I will free up some time to work on this. Bart.