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Thu, 15 Aug 2019 15:36:12 +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, 15 Aug 2019 15:36:10 +0300 Subject: Re: [PATCH v7 08/14] nvmet-core: allow one host per passthru-ctrl To: Logan Gunthorpe , , , , CC: Christoph Hellwig , Sagi Grimberg , "Keith Busch" , Jens Axboe , Chaitanya Kulkarni , Stephen Bates References: <20190801234514.7941-1-logang@deltatee.com> <20190801234514.7941-9-logang@deltatee.com> From: Max Gurtovoy Message-ID: <05a74e81-1dbd-725f-1369-5ca5c5918db1@mellanox.com> Date: Thu, 15 Aug 2019 15:36:02 +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: <20190801234514.7941-9-logang@deltatee.com> 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)(136003)(346002)(376002)(396003)(39860400002)(2980300002)(189003)(199004)(230700001)(2201001)(36756003)(5660300002)(86362001)(2906002)(31696002)(3846002)(6116002)(7736002)(7416002)(305945005)(65826007)(2616005)(476003)(126002)(486006)(26005)(186003)(16526019)(11346002)(229853002)(446003)(70206006)(70586007)(4744005)(53546011)(336012)(4326008)(2486003)(6246003)(76176011)(53936002)(50466002)(316002)(478600001)(36906005)(8936002)(16576012)(356004)(23676004)(6666004)(58126008)(110136005)(54906003)(106002)(31686004)(47776003)(65956001)(65806001)(8676002)(81156014)(81166006)(64126003)(3940600001)(2101003);DIR:OUT;SFP:1101;SCL:1;SRVR:VI1PR0502MB3072;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: 49d5e323-ad65-4e91-7fc6-08d7217d289c X-Microsoft-Antispam: BCL:0;PCL:0;RULEID:(2390118)(7020095)(4652040)(8989299)(4534185)(4627221)(201703031133081)(201702281549075)(8990200)(5600148)(711020)(4605104)(4709080)(1401327)(2017052603328)(7193020);SRVR:VI1PR0502MB3072; X-MS-TrafficTypeDiagnostic: VI1PR0502MB3072: X-Microsoft-Antispam-PRVS: X-MS-Oob-TLC-OOBClassifiers: OLM:4502; X-Forefront-PRVS: 01304918F3 X-MS-Exchange-SenderADCheck: 1 X-Microsoft-Antispam-Message-Info: JJKQusnZ9YbpiydBdlLayxL8/OBxfUt87G2tfK/wgm74SF0HT1vO90/c7U7QEMfJWnq/RSgf2YZQ1iLMGymg66bARHJIW5XGujbMuXhEe3K/a8ciuYbj+bRiHjwWaELLL4qvjtJgEjV+ZxgR8a54yM/KOH3kP2N5X0zG48d6E8ho/HNtHEjMHUVayV8kcm1Ad87oOysUgn0lniZ5aXk9Ll0iB88QMD86wZxwTCqBUbuAJsGXWZ5rXzkiyxKkERtUWjjd0wi87KenrdUUZA6nyEk9lng6/oMs/rozhDriy2X4C7gCBuzU/7Vt5ZigcVYW0T7gCl/8v//fFx+aCPXM41OF5BAV39CQsPT2vjbbfCNJ/HrouwnwQturDWQxKFtZ88z8KNhVcHYVZNwclHeM5B9MAOSn196Zulio91KTplQ= X-OriginatorOrg: Mellanox.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 15 Aug 2019 12:36:12.8585 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 49d5e323-ad65-4e91-7fc6-08d7217d289c 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: VI1PR0502MB3072 Sender: linux-fsdevel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-fsdevel@vger.kernel.org On 8/2/2019 2:45 AM, Logan Gunthorpe wrote: > This patch rejects any new connection to the passthru-ctrl if this > controller is already connected to a different host. At the time of > allocating the controller we check if the subsys associated with > the passthru ctrl is already connected to a host and reject it > if the hostnqn differs. This is a big limitation. Are we plan to enable many front-end ctrl's to connect to the single back-end ctrl in the future ? I guess it can be incremental to this series.