From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 2E791C433FE for ; Thu, 3 Feb 2022 19:47:43 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1353853AbiBCTrm (ORCPT ); Thu, 3 Feb 2022 14:47:42 -0500 Received: from mailout2.w2.samsung.com ([211.189.100.12]:22904 "EHLO mailout2.w2.samsung.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1353832AbiBCTrj (ORCPT ); Thu, 3 Feb 2022 14:47:39 -0500 Received: from uscas1p2.samsung.com (unknown [182.198.245.207]) by mailout2.w2.samsung.com (KnoxPortal) with ESMTP id 20220203194738usoutp0276ca491d2bad9d5cad29a04a45dee11e~QXmaResRH2527725277usoutp02N; Thu, 3 Feb 2022 19:47:38 +0000 (GMT) DKIM-Filter: OpenDKIM Filter v2.11.0 mailout2.w2.samsung.com 20220203194738usoutp0276ca491d2bad9d5cad29a04a45dee11e~QXmaResRH2527725277usoutp02N DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=samsung.com; s=mail20170921; t=1643917658; bh=EmNkfNLA9li219ObPpJv7EjtIObDOw354ofHnjfwxh4=; h=From:To:CC:Subject:Date:In-Reply-To:References:From; b=GsKNqeT7X952S/Z1/upCE3z1tG1lr2GQAxGw67VV/wqS55PiObsCJzdDnegWFwpza dVyA7h8uyVDyLOUJfO1iXA8pLDKrchAdd36PVsYbrxD6JWNLkWmvxygak56LcMPGE2 Xf2ITxiHTGW2G1wjOp4vknZcz9znhfdzsJw9qaaE= Received: from ussmges2new.samsung.com (u111.gpu85.samsung.co.kr [203.254.195.111]) by uscas1p1.samsung.com (KnoxPortal) with ESMTP id 20220203194738uscas1p133248633a850023d76c05f5fdc1b8fa2~QXmZ_kaDi3190531905uscas1p1o; Thu, 3 Feb 2022 19:47:38 +0000 (GMT) Received: from uscas1p2.samsung.com ( [182.198.245.207]) by ussmges2new.samsung.com (USCPEMTA) with SMTP id 33.6C.10104.A513CF16; Thu, 3 Feb 2022 14:47:38 -0500 (EST) Received: from ussmgxs2new.samsung.com (u91.gpu85.samsung.co.kr [203.254.195.91]) by uscas1p2.samsung.com (KnoxPortal) with ESMTP id 20220203194737uscas1p2d97def35481ec0e965e6dc6a15398e77~QXmZdB1uH2691326913uscas1p2H; Thu, 3 Feb 2022 19:47:37 +0000 (GMT) X-AuditID: cbfec36f-315ff70000002778-cb-61fc315a6040 Received: from SSI-EX3.ssi.samsung.com ( [105.128.2.145]) by ussmgxs2new.samsung.com (USCPEXMTA) with SMTP id 8B.17.10042.9513CF16; Thu, 3 Feb 2022 14:47:37 -0500 (EST) Received: from SSI-EX3.ssi.samsung.com (105.128.2.228) by SSI-EX3.ssi.samsung.com (105.128.2.228) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA384) id 15.1.2242.4; Thu, 3 Feb 2022 11:46:47 -0800 Received: from SSI-EX3.ssi.samsung.com ([fe80::8d80:5816:c578:8c36]) by SSI-EX3.ssi.samsung.com ([fe80::8d80:5816:c578:8c36%3]) with mapi id 15.01.2242.008; Thu, 3 Feb 2022 11:46:47 -0800 From: Adam Manzanares To: Luis Chamberlain CC: Christoph Hellwig , Keith Busch , "Vincent Fu" , Mikulas Patocka , =?iso-8859-1?Q?Javier_Gonz=E1lez?= , Chaitanya Kulkarni , "linux-block@vger.kernel.org" , "linux-scsi@vger.kernel.org" , "dm-devel@redhat.com" , "linux-nvme@lists.infradead.org" , linux-fsdevel , Jens Axboe , "msnitzer@redhat.com >> msnitzer@redhat.com" , "Bart Van Assche" , "martin.petersen@oracle.com >> Martin K. Petersen" , "roland@purestorage.com" , Hannes Reinecke , "Frederick.Knight@netapp.com" , "zach.brown@ni.com" , "osandov@fb.com" , "lsf-pc@lists.linux-foundation.org" , "djwong@kernel.org" , "josef@toxicpanda.com" , "clm@fb.com" , "dsterba@suse.com" , "tytso@mit.edu" , "jack@suse.com" , Kanchan Joshi Subject: Re: [RFC PATCH 3/3] nvme: add the "debug" host driver Thread-Topic: [RFC PATCH 3/3] nvme: add the "debug" host driver Thread-Index: AQHYF5o0LMwUDmubDUu2kNRmd7lMHKyAS6yAgAI7QoCAAAKFAIAAN5GAgAADtYA= Date: Thu, 3 Feb 2022 19:46:47 +0000 Message-ID: <20220203194735.GA249665@bgt-140510-bm01> In-Reply-To: Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [105.128.2.176] x-exchange-save: DSA Content-Type: text/plain; charset="iso-8859-1" Content-ID: <9A646861F09CB74EAB344C543E341AB7@ssi.samsung.com> Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-CFilter-Loop: Reflected X-Brightmail-Tracker: H4sIAAAAAAAAA02Se0xTVxzHd+69vb2UgJfH5Mz+MUu2acShKDYnyHDZFnP3iHFbMIMtjm7e AJFnW6Z1m7zCXGEdUJFhYZMCKQgKDBl20scAERGd3WoBO3USAQNMKDjpysvRXkz63+d3vt/v yfd3cig8sIvcQCWnyVlpmiQllBQQHVee3Hw1PmJJsj33exI13S0mUbnDhaOZrgc8pC6u4CPr qD8yTlfykOW/XAw9aHuKIUONGkNnm3ox9LC+FiDlgAVDSyMRSN09CJDRHoYMxn4CndGN8VHR kJ5Epikjjur7VjA0XDIGUOm3Ngz9rlkiUc89G4GalhAq+M7FR5Pmg68LGeutd5nS/Gk+k199 h2CsN7KYtkYlyVyoy2ZODtcDpvN2DsnkXe/FmYq5f0lm6PpFjFHlT5PM7JidYDpGVHxmxmQj mZZ2G7E/KF4QfYhNSf6ClW6LSRAk3TEUYhnN1NH+wlIyB+jJQuBDQToSDhovrbKACqTPArjc psXdQiBdgMGfrKJnprzWWwRnOg/gwP0xHjc4AHwy2wm4hBnAE0OZbibp7XCx72fPTcH0Zmgq UWHuAE63C2DnuHJVoKggOgZqXe9wnj1wrqdmzb8PrszZeW4m6JegtfRHD/vRu2Cf8qrH40OL 4R83zmBuBvR66Lx2zsM4HQLto9w5pANgTaUB53g9XLk0srayCP7tnOBzHAybnY9ILhsOh0+V rXEMrFqyERyHQZ12Cuc6BMD+06MEl30BdjUMe14F0r8KoHKihccJb8GZyco1kxAu39VhnKkR wLL5b/jccAHAigULVgJe1ng113g10Xg10Xg10Xg1qQa8RhCSJZOlJrKyHWnskXCZJFWWlZYY /nl6ahtY/eUDKz3pejBknw3vBhgFugGk8NBgv8Pli5JAv0MSxTFWmv6pNCuFlXUDIUWEhvjp klslgXSiRM4eZtkMVvpMxSifDTmYULx7wREgFxclUJnChwdUC1vfdlw+ZfksM1ahysYi9Tno r/7H2Ea5bkIdG3Hf9Bpubr44JfyqN1oo+uC4M0qi+m3yzeVUOPbhjriQcq1Pg2rzldppNoLX N1+VcPl8XoelrG45LS5KfHA4u1nvFMvNRXrtoCNDYR5v3fr1kczxj/0LWubbTj7+aN/TxSh1 00K8uvNY/dWaSNUrorD9zzfEtT/aa3KIN61L8hXUmdO3GRJHX1Rs2RVNHff7hA7yNf7zXmxd 9Q/PubpSemodhGI3Xewfadlp2xjkm1sANq2zB4iqvnzjWo2os2/nLwf8/7xnA+8n7Dm99/Y5 V8iJm8VHoxdDCVmSJGILLpVJ/ge4EQJSVAQAAA== X-Brightmail-Tracker: H4sIAAAAAAAAA02Sb0xTVxjGd+69vb00q1wKyBGnid1czMwqOFxODAOXDL2iMo2ZCbC03sgV CFC0hU3dvwpZEIRAmRDW1UEFC1LogG0KWUGhMGRo1dRKrdXBaLOgG3/NKrOBWa5L+u13znme 3/t+OBQumRJEU9nKAk6lZHOlpIjI1mDat1Nj/WzMP96tyPSwkkS1s4s4mumfFKDqyjohsntW od7p7wTo9rPTGJrsWsaQ5UI1hi6ZhjD0Z3MjQKWjtzHkn4hF1QP3AOp1bUaW3hEC1Ru9QnR2 rJtEfU96cdQ8vIQhZ5UXIO0ZB4ZsOj+JrI8cBDL5Efq6fFGIHl+V71jL2O/uYbTF00KmuMFN MPabhUxXaynJ/Nj0FfONsxkwv9zXkEzRjSGcqZt/SjJjN65gTEXxNMnMeV0Ec3miQsjM9DlI 5oefHMT+8DRRfAaXm/0Jp9qScFiU5baUYcfM1ImRMi2pAd1kGQihIB0HizruEmVAREloE4DW P1px/jALoN7oFgRSEvoqgO1n1wWYpGPg8+FOPMAR9CbYV1WBBQo43SWCz5Y9L7QUFU4nQMNi Mp9JhPPWCy/zKXBp3rXiJOg3oF17foXF9DY4XHod52eVELDp+4IAh9Dvwjs367EAA3o19P3W tsI4HQVdHv4e0jRsstzCeY6EU5NLAp43wN99U0KeI6DZ9zfJd2XQWXPuJSdAvd9B8LwZGg1P cH6fMDjyrYfgu2tgf4uTqAJrdEGjdUEqXZBKF6TSBakagKAVRBWq1XmZJ9RbldynMjWbpy5U ZsqO5Od1gRe/cXTJmt4NHrjmZAMAo8AAgBQujRDn1D5nJeIM9uQpTpWvUBXmcuoBsJYipFHi qTStQkJnsgVcDscd41T/v2JUSLQGe3//WLhk3JAy0ZTiuG4r/ywmwrOxeDlmt/zxzkZfUeuC K11u86QXbdmZ4zh1ZN36yyNHD/svjYvCVJ+nHkrMN7ftbe/Zt/5no1hvku9uTBhceLg9HpvF UsP27LpWkvT6O6dVghlzqHLouKukZZdhfN/9yM7Xki1P3YNtnfFGln60ITdr1RWDYRAJt2X8 mxkn3Oi2jSJpkkBzL/yDuVCZf1LRUaN3th1/D+v4MNp7pibtVaVdIjt/0ZTUkzhad/Ci71fr dmfo0dp0vfOja5Fs+5dhYrmtR5F6YEflx/17H8jqV7e8InizgT4Zb/Yu551bqKvaVH3oi/I7 qltko+KvxeQ4KaHOYmPfwlVq9j+0L3Ec/AMAAA== X-CMS-MailID: 20220203194737uscas1p2d97def35481ec0e965e6dc6a15398e77 CMS-TYPE: 301P X-CMS-RootMailID: 20220201183359uscas1p2d7e48dc4cafed3df60c304a06f2323cd References: <20220201102122.4okwj2gipjbvuyux@mpHalley-2> <20220202060154.GA120951@bgt-140510-bm01> <20220203160633.rdwovqoxlbr3nu5u@garbanzo> <20220203161534.GA15366@lst.de> Precedence: bulk List-ID: X-Mailing-List: linux-block@vger.kernel.org On Thu, Feb 03, 2022 at 11:34:27AM -0800, Luis Chamberlain wrote: > On Thu, Feb 03, 2022 at 05:15:34PM +0100, Christoph Hellwig wrote: > > On Thu, Feb 03, 2022 at 08:06:33AM -0800, Luis Chamberlain wrote: > > > On Wed, Feb 02, 2022 at 06:01:13AM +0000, Adam Manzanares wrote: > > > > BTW I think having the target code be able to implement simple copy= without=20 > > > > moving data over the fabric would be a great way of showing off the= command. > > >=20 > > > Do you mean this should be implemented instead as a fabrics backend > > > instead because fabrics already instantiates and creates a virtual > > > nvme device? And so this would mean less code? > >=20 > > It would be a lot less code. In fact I don't think we need any new cod= e > > at all. Just using nvme-loop on top of null_blk or brd should be all > > that is needed. >=20 > Mikulas, >=20 > That begs the question why add this instead of using null_blk with > nvme-loop? I think the only thing missing would be a handler for the simple copy comma= nd. >=20 > Luis= From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.133.124]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 92C4CC433FE for ; Fri, 4 Feb 2022 09:41:56 +0000 (UTC) Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id us-mta-168-37Vl77EMPtSjC3yEDCXQ8A-1; Fri, 04 Feb 2022 04:41:52 -0500 X-MC-Unique: 37Vl77EMPtSjC3yEDCXQ8A-1 Received: from smtp.corp.redhat.com (int-mx02.intmail.prod.int.phx2.redhat.com [10.5.11.12]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id BE23A1853022; 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Similar Internal Domain=false; Similar Monitored External Domain=false; Custom External Domain=false; Mimecast External Domain=false; Newly Observed Domain=false; Internal User Name=false; Custom Display Name List=false; Reply-to Address Mismatch=false; Targeted Threat Dictionary=false; Mimecast Threat Dictionary=false; Custom Threat Dictionary=false X-Scanned-By: MIMEDefang 2.78 on 10.11.54.4 X-MIME-Autoconverted: from quoted-printable to 8bit by lists01.pubmisc.prod.ext.phx2.redhat.com id 213JloKs009269 X-loop: dm-devel@redhat.com X-Mailman-Approved-At: Fri, 04 Feb 2022 04:41:43 -0500 Cc: Vincent Fu , "djwong@kernel.org" , "linux-nvme@lists.infradead.org" , "clm@fb.com" , "dm-devel@redhat.com" , "osandov@fb.com" , =?iso-8859-1?Q?Javier_Gonz=E1lez?= , Bart Van Assche , "linux-scsi@vger.kernel.org" , Christoph Hellwig , "roland@purestorage.com" , "zach.brown@ni.com" , "dsterba@suse.com" , Chaitanya Kulkarni , "msnitzer@redhat.com >> msnitzer@redhat.com" , "josef@toxicpanda.com" , "linux-block@vger.kernel.org" , Mikulas Patocka , Keith Busch , "Frederick.Knight@netapp.com" , Jens Axboe , "tytso@mit.edu" , Kanchan Joshi , "martin.petersen@oracle.com >> Martin K. Petersen" , "jack@suse.com" , linux-fsdevel , "lsf-pc@lists.linux-foundation.org" Subject: Re: [dm-devel] [RFC PATCH 3/3] nvme: add the "debug" host driver X-BeenThere: dm-devel@redhat.com X-Mailman-Version: 2.1.12 Precedence: junk List-Id: device-mapper development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: dm-devel-bounces@redhat.com Errors-To: dm-devel-bounces@redhat.com X-Scanned-By: MIMEDefang 2.79 on 10.5.11.12 Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=dm-devel-bounces@redhat.com X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Language: en-US Content-ID: <9A646861F09CB74EAB344C543E341AB7@ssi.samsung.com> Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit On Thu, Feb 03, 2022 at 11:34:27AM -0800, Luis Chamberlain wrote: > On Thu, Feb 03, 2022 at 05:15:34PM +0100, Christoph Hellwig wrote: > > On Thu, Feb 03, 2022 at 08:06:33AM -0800, Luis Chamberlain wrote: > > > On Wed, Feb 02, 2022 at 06:01:13AM +0000, Adam Manzanares wrote: > > > > BTW I think having the target code be able to implement simple copy without > > > > moving data over the fabric would be a great way of showing off the command. > > > > > > Do you mean this should be implemented instead as a fabrics backend > > > instead because fabrics already instantiates and creates a virtual > > > nvme device? And so this would mean less code? > > > > It would be a lot less code. In fact I don't think we need any new code > > at all. Just using nvme-loop on top of null_blk or brd should be all > > that is needed. > > Mikulas, > > That begs the question why add this instead of using null_blk with > nvme-loop? I think the only thing missing would be a handler for the simple copy command. > > Luis -- dm-devel mailing list dm-devel@redhat.com https://listman.redhat.com/mailman/listinfo/dm-devel