Received: by 2002:a25:8b12:0:0:0:0:0 with SMTP id i18csp661896ybl; Thu, 22 Aug 2019 02:58:42 -0700 (PDT) X-Google-Smtp-Source: APXvYqyBu8GjCyH3wKdwYUizP3ohKlbZ99nI3fO/A0vwmtgnzDswm5jBAADxiQlA6+tAgF6g9+8d X-Received: by 2002:a63:b20f:: with SMTP id x15mr33951856pge.453.1566467922355; Thu, 22 Aug 2019 02:58:42 -0700 (PDT) ARC-Seal: i=2; a=rsa-sha256; t=1566467922; cv=pass; d=google.com; s=arc-20160816; b=zCl2x6bDo7bKPeJDMStXniRfTwF5Z7MKdIedAud5a7+3UbhxtVTcGKDdgNSQTItd8e /QauiQ1syXMJ4BLqoNuOYwjWw35IQMHQsjWW7ms8+ua025R7NRipTU/Yxk79nb9TUfhB eGZremLc/aRrEM+WGA8J5UDM2zk5DzBOinEjEP24Rm2TanPXWevJg8khjku2sfMZTFPn DtqQLdJEewIAcH4wDp7KqqxxDURWb8BLwy5J+Da/L2/nAtoj7hjHPdrnexZqKrId/Jpa bEnFlWNn+T+gLvsD2thl3rbdXNRqQuumT8COg4HDlvRwlGoyK3peeHSh5gZJb1MPmti0 x/ag== ARC-Message-Signature: i=2; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-id:precedence:sender:content-language :content-transfer-encoding:in-reply-to:mime-version:user-agent:date :message-id:from:references:cc:to:subject:dkim-signature; bh=PnLoCxABMtAX3omr7pMVdNrggxZn5x0JCJL9YY/zEKA=; b=oHO9Kbzy2yDou+d7LUBcDIsJMKyaXGSJxPtuQMTGexk3Q8eyD6T+FyhCamd7xNnWSp NhnGQaqpHfWVNIssG6CF21jSe37a4I3TXgRUF8Kzdz+cHrU/1zJrrJE20SrBgbnfujqW ZRJ6xk8ivOUyV8bEC3hZfw86E1ovn2ccX4yyz+MOLQ/89NgxHX8cX4fn1YMW9O4FWt5S Ese0mrBhbYt8+c52N+Cgp+ZqPmLEMN6upAo3+sC0q/MUeXNjZ299gYHqq8+Ilo8SfhDi TEmE+F+0ulq7KaZbeaB+Klm1WspqDFn7RFCn8yYY9GZW8ViD+paQ42E0fTZmUvBifWEI tPyQ== ARC-Authentication-Results: i=2; mx.google.com; dkim=pass header.i=@Mellanox.com header.s=selector2 header.b=hiYyr9FW; arc=pass (i=1 spf=pass spfdomain=mellanox.com dmarc=pass fromdomain=mellanox.com); spf=pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=mellanox.com Return-Path: Received: from vger.kernel.org (vger.kernel.org. [209.132.180.67]) by mx.google.com with ESMTP id h10si2063335pje.43.2019.08.22.02.58.27; Thu, 22 Aug 2019 02:58:42 -0700 (PDT) Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67; Authentication-Results: mx.google.com; dkim=pass header.i=@Mellanox.com header.s=selector2 header.b=hiYyr9FW; arc=pass (i=1 spf=pass spfdomain=mellanox.com dmarc=pass fromdomain=mellanox.com); spf=pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=mellanox.com Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1732751AbfHVIuu (ORCPT + 99 others); Thu, 22 Aug 2019 04:50:50 -0400 Received: from mail-eopbgr130059.outbound.protection.outlook.com ([40.107.13.59]:40933 "EHLO EUR01-HE1-obe.outbound.protection.outlook.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1730488AbfHVIuu (ORCPT ); Thu, 22 Aug 2019 04:50:50 -0400 ARC-Seal: i=1; a=rsa-sha256; s=arcselector9901; d=microsoft.com; cv=none; b=ZssP3R6H2QtWg+Nm3knsDOp2nGmQJRpuDYMu6YVlfDlGetcfA5Fba0cqJi9UlnvZouJlZNiweA/aOYxf/1DZVwSLXr2GR/IBH3k1gBN0fszYV1ZBVNB+a2oWovX5db0JxeSglQgIDvgaH71JaWojmq8Jct7+qzKtsxZxcNwzAWdC8ukEJN/Q1yRg6Ria/jIki+mReordJfoqAlmoJtYliJGqFJw0IH6Y2k9ydaalkh1A0Rr5IOqJSbGMql4tTQR4nDUMWk9/cvZxN2kyxaMRWCksomirkx0yKh9OwaEFfBzdxbH/qI7ZSV/QvzJEQdIRF1+Yib3tm6Hb/nDfPoDGZg== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=microsoft.com; s=arcselector9901; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck; bh=PnLoCxABMtAX3omr7pMVdNrggxZn5x0JCJL9YY/zEKA=; b=BXpG7yCygj9zq9ubBo10zgOiZshBNe5OKbfyKQxVmU5TqYFhDNAaH+bDHzqDfa2EHXpDszaf+dPRagfC6N+eujZit0I/MHBU+9Nu5/+nW4VBS3orCVQSuZmoHZoJy86zDj3mwNG81KikXvr0xcQOOqPSOy4Ok6bfs7kK3Hq6X6n8t3OP7s8fDYtYr5ZlDQ0ANiMtMCOFWn9ZyjOAoU3rw+UbVuW/JPpdjPw0CEutkHBSxyG4R6hLmiT5M7RZInNFjRe7m6ILyVeJGSrfp0fwhPpLRMSlOzRqp8KUiiLSz0AO3B8oIRIKjqlpZd/wxHxxlPHzuMzIoIxpUXrYp+Nfjg== ARC-Authentication-Results: i=1; mx.microsoft.com 1; spf=pass (sender ip is 193.47.165.251) smtp.rcpttodomain=lst.de smtp.mailfrom=mellanox.com; dmarc=pass (p=none sp=none pct=100) action=none header.from=mellanox.com; dkim=none (message not signed); arc=none DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=Mellanox.com; s=selector2; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck; bh=PnLoCxABMtAX3omr7pMVdNrggxZn5x0JCJL9YY/zEKA=; b=hiYyr9FWm9jxV+GF78d5r8usBa3UtpqshgDKSq1chOglmrtzuUILr6b2nwL2b7fzi/CKBAsygH5cX6tjYVGS4ZJ/m2KD/dYI58zQ56pRUQlpt1cc2oS1HC1LfBL5Hi5AMK3ONdOXM/twEbi9uq5UkBJH4GG1wb0DEsi4Ja7TOXw= Received: from DB6PR05CA0024.eurprd05.prod.outlook.com (2603:10a6:6:14::37) by HE1PR05MB3386.eurprd05.prod.outlook.com (2603:10a6:7:33::12) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.2178.18; Thu, 22 Aug 2019 08:50:44 +0000 Received: from AM5EUR03FT008.eop-EUR03.prod.protection.outlook.com (2a01:111:f400:7e08::203) by DB6PR05CA0024.outlook.office365.com (2603:10a6:6:14::37) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.2199.14 via Frontend Transport; Thu, 22 Aug 2019 08:50:44 +0000 Authentication-Results: spf=pass (sender IP is 193.47.165.251) smtp.mailfrom=mellanox.com; lst.de; dkim=none (message not signed) header.d=none;lst.de; dmarc=pass action=none header.from=mellanox.com; Received-SPF: Pass (protection.outlook.com: domain of mellanox.com designates 193.47.165.251 as permitted sender) receiver=protection.outlook.com; client-ip=193.47.165.251; helo=mtlcas13.mtl.com; Received: from mtlcas13.mtl.com (193.47.165.251) by AM5EUR03FT008.mail.protection.outlook.com (10.152.16.123) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA384) id 15.20.2199.13 via Frontend Transport; Thu, 22 Aug 2019 08:50:43 +0000 Received: from MTLCAS13.mtl.com (10.0.8.78) by mtlcas13.mtl.com (10.0.8.78) with Microsoft SMTP Server (TLS) id 15.0.1178.4; Thu, 22 Aug 2019 11:50:43 +0300 Received: from MTLCAS01.mtl.com (10.0.8.71) by MTLCAS13.mtl.com (10.0.8.78) with Microsoft SMTP Server (TLS) id 15.0.1178.4 via Frontend Transport; Thu, 22 Aug 2019 11:50:43 +0300 Received: from [10.223.0.54] (10.223.0.54) by MTLCAS01.mtl.com (10.0.8.71) with Microsoft SMTP Server (TLS) id 14.3.301.0; Thu, 22 Aug 2019 11:50:41 +0300 Subject: Re: [PATCH v7 08/14] nvmet-core: allow one host per passthru-ctrl To: Sagi Grimberg , Logan Gunthorpe , , , , CC: Chaitanya Kulkarni , Stephen Bates , Jens Axboe , Keith Busch , Christoph Hellwig References: <20190801234514.7941-1-logang@deltatee.com> <20190801234514.7941-9-logang@deltatee.com> <05a74e81-1dbd-725f-1369-5ca5c5918db1@mellanox.com> <5717f515-e051-c420-07b7-299bcfcd1f32@mellanox.com> From: Max Gurtovoy Message-ID: Date: Thu, 22 Aug 2019 11:50:41 +0300 User-Agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:60.0) Gecko/20100101 Thunderbird/60.8.0 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset="utf-8"; format=flowed Content-Transfer-Encoding: 7bit Content-Language: en-US X-Originating-IP: [10.223.0.54] X-EOPAttributedMessage: 0 X-MS-Office365-Filtering-HT: Tenant X-Forefront-Antispam-Report: CIP:193.47.165.251;IPV:NLI;CTRY:IL;EFV:NLI;SFV:NSPM;SFS:(10009020)(4636009)(39860400002)(376002)(346002)(136003)(396003)(2980300002)(189003)(199004)(305945005)(4744005)(229853002)(81166006)(2201001)(14444005)(6116002)(65956001)(336012)(2616005)(2906002)(126002)(7416002)(476003)(7736002)(47776003)(81156014)(65806001)(8676002)(356004)(86362001)(446003)(11346002)(31696002)(110136005)(8936002)(70206006)(16526019)(76176011)(54906003)(5660300002)(58126008)(70586007)(26005)(53546011)(16576012)(2486003)(23676004)(230700001)(31686004)(50466002)(53936002)(4326008)(3846002)(486006)(6246003)(106002)(478600001)(36756003)(36906005)(186003)(316002)(3940600001)(2101003);DIR:OUT;SFP:1101;SCL:1;SRVR:HE1PR05MB3386;H:mtlcas13.mtl.com;FPR:;SPF:Pass;LANG:en;PTR:InfoDomainNonexistent;MX:1;A:1; X-MS-PublicTrafficType: Email X-MS-Office365-Filtering-Correlation-Id: 27cf8248-09ad-4689-adf4-08d726ddd199 X-Microsoft-Antispam: BCL:0;PCL:0;RULEID:(2390118)(7020095)(4652040)(8989299)(5600166)(711020)(4605104)(4709080)(1401327)(4534185)(4627221)(201703031133081)(201702281549075)(8990200)(2017052603328)(7193020);SRVR:HE1PR05MB3386; X-MS-TrafficTypeDiagnostic: HE1PR05MB3386: X-Microsoft-Antispam-PRVS: X-MS-Oob-TLC-OOBClassifiers: OLM:4502; X-Forefront-PRVS: 01371B902F X-MS-Exchange-SenderADCheck: 1 X-Microsoft-Antispam-Message-Info: o0D3b+LPtTFxEh6LIDZnvyDQ85SdBeQ9jRo13on+wTps+/+Ghi97u9iUcX57HNTYC0DUjkmQjCxNZknXihOm9caoL0CUeM47rfcUcH42VzoVauuCoXpugbFqU1lptvENkI38SGjSC5qudpcaNXfxeqSEOXO8vC/glKaEkTqLs2dgAFfH7e+JNXYRsQj3N1g9Smy7c3ZikJusnMYTecvOq/tSGS/tevJcBxJf3XxVfN0ccOncUuZWr5ziw/qvLiUKbQBOjrD3oDikCV7iiHTHVk710rsR2FwbdFYlACbw6k/JDZp16wubYMm/ETbeRNIetdLZ73VjpIMSNbdY7DaU3yxysZ0nvSuyilwShH1qiLgkgYnzB5EzPtJ6flAolw8gJJBunVLYu5JzFaIP/nrasmaEBeZW/t6ShIMk7RH8MMM= X-OriginatorOrg: Mellanox.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 22 Aug 2019 08:50:43.8478 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 27cf8248-09ad-4689-adf4-08d726ddd199 X-MS-Exchange-CrossTenant-Id: a652971c-7d2e-4d9b-a6a4-d149256f461b X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=a652971c-7d2e-4d9b-a6a4-d149256f461b;Ip=[193.47.165.251];Helo=[mtlcas13.mtl.com] X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: HE1PR05MB3386 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 8/22/2019 3:09 AM, Sagi Grimberg wrote: > >> I don't understand why we don't limit a regular ctrl to single access >> and we do it for the PT ctrl. >> >> I guess the block layer helps to sync between multiple access in >> parallel but we can do it as well. >> >> Also, let's say you limit the access to this subsystem to 1 user, the >> bdev is still accessibly for local user and also you can create a >> different subsystem that will use this device (PT and non-PT ctrl). >> >> Sagi, >> >> can you explain the trouble you meant and how this limitation solve it ? > > Its different to emulate the controller with all its admin > commands vs. passing it through to the nvme device.. (think of format > nvm) > > > we don't need to support format command for PT ctrl as we don't support other commands such create_sq/cq.