From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mx0b-00069f02.pphosted.com (mx0b-00069f02.pphosted.com [205.220.177.32]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 6F0F144B693; Mon, 7 Sep 2026 10:53:32 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=fail smtp.client-ip=205.220.177.32 ARC-Seal:i=2; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1788778414; cv=fail; b=f/Ih10nmIcUrH1krX3faGP7NbXyqMIjstIwZIzrU/suP93eU/7MMgoFft7S2vcHdO6+tXdwq/L+wX678iy/FLW7LqPaOBeQW9N8ZMDPpGwKjx818DgbdCdvP29nLuR+gVJVUaMdCmzxxRrVkey1a3c/ylrzFJtnxRR+rWOQV6LY= ARC-Message-Signature:i=2; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1788778414; c=relaxed/simple; bh=bcGOTlhWKWe0jzeTpP/KaFYLU5u4iuxJIHrGzDLJtKY=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: Content-Type:MIME-Version; b=EZSn0lLWFnl770T8KBQmY3exwr2EDBvaDM8AdYS53759LFya1IAZ1gxM7wSx8MSwqt3lNkMnYdB+eGMmLVSPMY+R+wMWjMNbptWZLg9I7Ug4nalkfed7uNWPBWJKCtPMRIydE04chqAMyzaOxZXZ+JrbV7Fk1irlnrHyuF1y+JE= ARC-Authentication-Results:i=2; smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=oracle.com; spf=pass smtp.mailfrom=oracle.com; dkim=pass (2048-bit key) header.d=oracle.com header.i=@oracle.com header.b=MvL7c4U4; dkim=pass (1024-bit key) header.d=oracle.onmicrosoft.com header.i=@oracle.onmicrosoft.com header.b=RFUdK42v; arc=fail smtp.client-ip=205.220.177.32 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=oracle.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=oracle.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=oracle.com header.i=@oracle.com header.b="MvL7c4U4"; dkim=pass (1024-bit key) header.d=oracle.onmicrosoft.com header.i=@oracle.onmicrosoft.com header.b="RFUdK42v" Received: from pps.filterd (m0246630.ppops.net [127.0.0.1]) by mx0b-00069f02.pphosted.com (8.18.1.11/8.18.1.11) with ESMTP id 6871NBFR287528; Mon, 7 Sep 2026 10:51:18 GMT DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=oracle.com; h=cc :content-transfer-encoding:content-type:date:from:in-reply-to :message-id:mime-version:references:subject:to; s= corp-2025-04-25; bh=9vZhiDW/lW3ihQBi6XvuhbnyvV4zjUPIhITgvKfCfI8=; b= MvL7c4U4Vp/dSQcZlcNzzOJdDFQRoVnGRZ8Dwli94vv0i5jthkH0XcFAkj8MsySq Er2CQ7pRbIfM3FUqaxrRG+ZB8Uwu9EyMrQOu4B7M45x0qZM7pfygvs39xW8G1kKK U6VYmKNIWNDs3fP4sDryGmO4LAqu1js2mB85DjtWFIDpHnyBs/Mj5VxyFGguil+9 Gfvjl4XY3KiXq5XDFZNCo/Yr5C4ob6VkIRBugj9/ty0n3YvPFYCRrc79UtLWTytf 0TO2chvVnkg1ZTebP3k3dveIJCXGLMDjsskndk1uyVHduvotTcVmXfwBg8V/WsM5 NAjc/WSKpOYtKBdRgtF5pw== Received: from phxpaimrmta02.imrmtpd1.prodappphxaev1.oraclevcn.com (phxpaimrmta02.appoci.oracle.com [147.154.114.232]) by mx0b-00069f02.pphosted.com (PPS) with ESMTPS id 4ggbdessgb-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Mon, 07 Sep 2026 10:51:18 +0000 (GMT) Received: from pps.filterd (phxpaimrmta02.imrmtpd1.prodappphxaev1.oraclevcn.com [127.0.0.1]) by phxpaimrmta02.imrmtpd1.prodappphxaev1.oraclevcn.com (8.18.1.7/8.18.1.7) with ESMTP id 687AopfD019106; Mon, 7 Sep 2026 10:51:17 GMT Received: from sj2pr03cu001.outbound.protection.outlook.com (mail-westusazon11012020.outbound.protection.outlook.com [52.101.43.20]) by phxpaimrmta02.imrmtpd1.prodappphxaev1.oraclevcn.com (PPS) with ESMTPS id 4gh74q8rtr-7 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=FAIL); Mon, 07 Sep 2026 10:51:17 +0000 (GMT) ARC-Seal: i=1; a=rsa-sha256; s=arcselector10001; d=microsoft.com; cv=none; b=tz+n0TYljd14b/Q+qXh0vF9RqhLNn2MXKQTR6A8J3TJf1FAQI0OXifaW90bQr7Zk0k62vxkRQUTbE8mZqvkwcTXOZkQ7D45q4NEuI3LwGWViXQGEMaW9MKSwQAPXaxiYtAIzGvbW/mR0YBZibzrik5oeLNDPoWLuPy6IN27hVoTNHNqJOG+Bn5P1wwVVE9AB/FgDgQ5w+toHsTYTxT6LzVrfTAAwcEHfMlkRYhkBCKHEH4Oexz80HezTwSlQSAR8+XYi1nhxqAZ/2NokNhl4DeZJvydRoJIa2QCfFsThI1w/r9KKEfW6YSj0ZsNXaKOkY/MvLmNfbf/kUc2JKwV8rw== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=microsoft.com; s=arcselector10001; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-AntiSpam-MessageData-ChunkCount:X-MS-Exchange-AntiSpam-MessageData-0:X-MS-Exchange-AntiSpam-MessageData-1; bh=9vZhiDW/lW3ihQBi6XvuhbnyvV4zjUPIhITgvKfCfI8=; b=X8oxprJf+so7sKLH3ZD4DrYBkl91O8EvHLOok39FmIjqI/6oRNDcAn2D+Zae4NVkB3lY/BZxVG7Sl7wEHykC5IujxqaIiPPfV8q//P/BJfNs/5ZnrNl6eqw3ZiESBGFUpq9U5s93KR1RrK0RmRxBLtORbfLYQ7CcfuE/IM0Jz1+CSF4Vn56oe2IwGIulSQAEwhNW+B5BJuDIhzncg50kyox+B6gsZYqNlbXU/8e8HJNdRQQo6u/BrqKRRVdxaVoqvQb2cEPt3Qs5jYg3QPvs05m0Nk0Oa3qzWOg7fNbVcQx5es232r3E+fKpnIlLtkKN7noEhY751WjBoqGQTbpFag== ARC-Authentication-Results: i=1; mx.microsoft.com 1; spf=pass smtp.mailfrom=oracle.com; dmarc=pass action=none header.from=oracle.com; dkim=pass header.d=oracle.com; arc=none DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=oracle.onmicrosoft.com; s=selector2-oracle-onmicrosoft-com; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck; bh=9vZhiDW/lW3ihQBi6XvuhbnyvV4zjUPIhITgvKfCfI8=; b=RFUdK42vulTmNTHGgGhjbwhtSg7j32426ryB5J4ayhu3Y4IydWd8uJibx2ddDbprMDErZGm/XD0tHvcxarFbpYaa3iTADRfyzpZCrkhEJLM/m9vjgRwwBYz/k/2pnUuHbAO0a3VQY1wp8N+b6VbOtncCN5TpsA2sN9bz1i/L5Ko= Received: from DM4PR10MB6229.namprd10.prod.outlook.com (2603:10b6:8:8c::12) by SJ5PPFA7D84DD83.namprd10.prod.outlook.com (2603:10b6:a0f:fc02::7c0) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.21.406.6; Mon, 7 Sep 2026 10:50:58 +0000 Received: from DM4PR10MB6229.namprd10.prod.outlook.com ([fe80::867:63e7:13fa:fa7d]) by DM4PR10MB6229.namprd10.prod.outlook.com ([fe80::867:63e7:13fa:fa7d%6]) with mapi id 15.21.0406.005; Mon, 7 Sep 2026 10:50:57 +0000 From: John Garry To: james.bottomley@hansenpartnership.com, hare@suse.com, mkp@kernel.org Cc: jmeneghi@redhat.com, linux-nvme@lists.infradead.org, linux-scsi@vger.kernel.org, michael.christie@oracle.com, snitzer@kernel.org, bmarzins@redhat.com, dm-devel@lists.linux.dev, linux-kernel@vger.kernel.org, nilay@linux.ibm.com, john.garry@linux.dev, hch@lst.de, kbusch@kernel.org, sagi@grimberg.me Subject: [PATCH v8 11/27] scsi-multipath: introduce basic SCSI device support Date: Mon, 7 Sep 2026 10:50:05 +0000 Message-ID: <20260907105021.1763236-12-john.g.garry@oracle.com> X-Mailer: git-send-email 2.43.7 In-Reply-To: <20260907105021.1763236-1-john.g.garry@oracle.com> References: <20260907105021.1763236-1-john.g.garry@oracle.com> Content-Transfer-Encoding: 8bit Content-Type: text/plain X-ClientProxiedBy: PH2PEPF0000385E.namprd17.prod.outlook.com (2603:10b6:518:1::6c) To DM4PR10MB6229.namprd10.prod.outlook.com (2603:10b6:8:8c::12) Precedence: bulk X-Mailing-List: linux-scsi@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: DM4PR10MB6229:EE_|SJ5PPFA7D84DD83:EE_ X-MS-Office365-Filtering-Correlation-Id: 81fd0b94-e9d5-49e5-40eb-08df0ccde5a5 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|376014|1800799024|7416014|23010399003|366016|10067099003|56012099006|22082099003|18002099003; X-Microsoft-Antispam-Message-Info: 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 X-Forefront-Antispam-Report: CIP:255.255.255.255;CTRY:;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:DM4PR10MB6229.namprd10.prod.outlook.com;PTR:;CAT:NONE;SFS:(13230040)(376014)(1800799024)(7416014)(23010399003)(366016)(10067099003)(56012099006)(22082099003)(18002099003);DIR:OUT;SFP:1101; X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: =?us-ascii?Q?u88xSK6bFFyzf4Vw7ipfJ8Ii7Ze/J5zS3O9f3oYzGiH3j1sfGDXzaHL3rD85?= =?us-ascii?Q?4vkNlwLszThaYTZ0ZZsTZy5FQNNiBswGw6CX5vebdwIZg1ugO+ZInwsANdcP?= =?us-ascii?Q?N6ysa/3WoWwmra3fg7VXv0jt7ZuT4yoL1A3MOU0Xf4tjyB4WyfAoRZdOdFvy?= =?us-ascii?Q?JFu0dowZaudjZNsQwkLXQeoyaHpibg2jXxq9R+7d/Ncyh6VVgqvEov3k0Oy4?= =?us-ascii?Q?Iq46wjxTgI3c3uFsnj2tUAHYkZfx6bsAUzvCWW58qunyI8vnV4G/+uRgxlKk?= =?us-ascii?Q?OZ97ra4kgWN//FVIOE5GftsiTPSiVsjGtIz/1z69UD97gCOZ3XZSCZELCXpg?= =?us-ascii?Q?o9o+ta79/IBiY4pYZ2fxA9nBE6zzf2vv3Q8ZTb3sF9fg2o7kicH7aIrj8QnL?= =?us-ascii?Q?iz6RyumM2TuqcKeXnrHrgJIC1z2S1MHsaJ3arEwm+NPxR8XXnjXJNOt5jtsY?= =?us-ascii?Q?ixOxvx9JZZv0XYET9eyUmHlh/3ZAVtW0H4vWbTPvtBeYtqoc8AyGgAJkjQ4P?= =?us-ascii?Q?46jWi9XRmOljcBZ5S6Vy8AkTbRLx+NVSK4Jn48V+Q4SPhA4D3Rkb0kNFQVlf?= =?us-ascii?Q?j25igDkmfbbvbaXHXxX1/ehVkT6gch3Fc4S/fK7GjYVLyj5Lcioi9ZkcdTUo?= =?us-ascii?Q?8AngfuT2dvCKDeOBorxakzH/J14Tr5+7NK1CjHYBAZdl3HSRY2FDpeHe04hM?= =?us-ascii?Q?+HXFx4LmXaf09y7WCwZ9VH6HWmT7kbNetM8YF9S35pRM2PEMv2ggD77dgc5a?= =?us-ascii?Q?WTodpiB/Ul5w1h+FEdu7wEruIwbKUQJ+7EKwMjC4+4Uigvrk1Cco3YEJDLZv?= =?us-ascii?Q?ir0gbNM1urEm3rICUihQspGaqbLufMHQZ7BhIeC6CmJP+60nfiSrxN4frNpm?= =?us-ascii?Q?iLqFxoeNJp2yVoUp/IfpG7PH2uSHsfSdt/AUALX7exq9KhIZH8NRJKLLRLXm?= =?us-ascii?Q?m283oD8gcD8htsz/Hq7ZKoO9pYfokrGqw0JVOdYW5SpyTIgFphUkjPRnjhSC?= =?us-ascii?Q?KTEUmJYNgLLZdfRjiHwJlF7WeIHp72iBOzHKxT19EL03pYWYfqPXFw2ukRl0?= =?us-ascii?Q?HL/JHRWjE5RJJSDqlF6iL1UaYim+Pw4E2Mi28gO+Pf9zCbS4yEsRjcsOdEVq?= =?us-ascii?Q?irzYmbZ/J2LwK4YhzSl5I3Vy+ca7svN84fP+W5HIRp0igEfa0QSTqrGVBeFi?= =?us-ascii?Q?TDlejPCiNa/DXdoyVV+A7QWFfeenDBellQyIdyAsZJZEm8ktkjTX0Qlru92f?= =?us-ascii?Q?t+m1g4d09/Ip6dlzDOGiHvRgc38ZAbuHYEEfRAC0GReQZ7WCnYMpaRjYzTB1?= =?us-ascii?Q?CGi8nCOeDMZTeAh+x07Z8W2MT+Az1WhfNd60Y4H9O5gmeZ/E+07G4KG7n8Ah?= =?us-ascii?Q?hFsRiX9r6qGtC14EILscZohDiR7f+GqqtbaqCN1avGamU/ST1TAArSAWvG2Z?= =?us-ascii?Q?mu0JykwFn8dPQW1sg6OY37hOWDyRgseLsdsW6k9vRd0TH311DEs8YL/fq0mm?= =?us-ascii?Q?4J2glVyTSgQaIILJNbWawIHQP15zpdXnotUd6sNL2djJKyXZyZIRpJTckr35?= =?us-ascii?Q?5y9IndyIzb89dX38s6hVhVXONZ/3qJLoXgTnKrZuQ860zAQOR9snAETW5+a1?= =?us-ascii?Q?zleUjfL/ohZJ9EeOhtDfyBv9wfmaNLnZN9tbLn2r5wZnc8eu7mY9+Hutq25u?= =?us-ascii?Q?Q310K2o7okYU0IDxlUsElegZNkbTVqgMZrs1Ose7sT/OrYODu7YPKEG+9NPQ?= =?us-ascii?Q?Go5cNKtHcg=3D=3D?= X-Exchange-RoutingPolicyChecked: f2oY8VwBEg3WSBByHuhtUL9g18iIyJ0M21Oix0CLdVYET23AxQmg/H+ohy5w6TeiybxZoQ9CUPN2zns8OPOrWncxdnITKJRsSNb/tlXYwycmlrVSfXKMndZ7Jt7UYfXZu6LmIgaq6e+PvKvFmg/E22aoFUOxX9NM3yEZl6fezSEIJ5ZvPAeWDfPSIXimDPx49UvooHQPsg0+KgEXd2VoIOAG/oJh5Qei67V6iJ3AdzoFpqHO85iFi8rhFyzQucJ5FbobBETfrkW19wpSTVy4M35ULWJS4WZMsrDWM/St3Qz/tMqrAYmHzhVTwXcFizKT76BZx2pd02DYspUryQD8zw== X-MS-Exchange-AntiSpam-ExternalHop-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-ExternalHop-MessageData-0: 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 X-OriginatorOrg: oracle.com X-MS-Exchange-CrossTenant-Network-Message-Id: 81fd0b94-e9d5-49e5-40eb-08df0ccde5a5 X-MS-Exchange-CrossTenant-AuthSource: DM4PR10MB6229.namprd10.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 07 Sep 2026 10:50:57.2800 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: 4e2c6054-71cb-48f1-bd6c-3a9705aca71b X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: IYoqdaluSjNCYOORzO5dsAbXDri8cGFlt/Yb9ptEEmeVtEzr0y/y6THE/YnbOyg3eOLRnZcxoDQa6VRdcdH/Ag== X-MS-Exchange-Transport-CrossTenantHeadersStamped: SJ5PPFA7D84DD83 X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1176,Hydra:6.1.134,FMLib:17.12.100.49 definitions=2026-09-07_03,2026-09-07_01,2025-10-01_01 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 mlxlogscore=999 bulkscore=0 lowpriorityscore=0 adultscore=0 mlxscore=0 malwarescore=0 phishscore=0 spamscore=0 suspectscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.19.0-2606160000 definitions=main-2609070119 X-Proofpoint-GUID: eEYM5aEgTuguJL-D7ho09ZFGihym4FvS X-Proofpoint-ORIG-GUID: eEYM5aEgTuguJL-D7ho09ZFGihym4FvS X-Authority-Analysis: v=2.4 cv=R94z39RX c=1 sm=1 tr=0 ts=6a9e9726 cx=c_pps a=OOZaFjgC48PWsiFpTAqLcw==:117 a=OOZaFjgC48PWsiFpTAqLcw==:17 a=6eWqkTHjU83fiwn7nKZWdM+Sl24=:19 a=z/mQ4Ysz8XfWz/Q5cLBRGdckG28=:19 a=lCpzRmAYbLLaTzLvsPZ7Mbvzbb8=:19 a=xqWC_Br6kY4A:10 a=VdqzKS8jKosA:10 a=GoEa3M9JfhUA:10 a=VkNPw1HP01LnGYTKEx00:22 a=jiCTI4zE5U7BLdzWsZGv:22 a=x4eqshVgHu-cdnggieHk:22 a=pCOl5fTshOrEa-n2-VQA:9 X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwOTA3MDExOCBTYWx0ZWRfX4puzIgAg35Of 6df0FGAilna0jPvw2BEMXHxzREqEJJMhSlWYXbp8XCaILqe8pWO9fReMhCt7ldQKA5n2+NtZbC/ iNpg96yVMBLY4c3LgFT8sbyWTu7EQKNc3qpDf6TI5hwUXY+zh6aTlpJ5dkEUz4og9JM5JbbzYGD UXYS01BMpj3oCWSrgWNinxLsZBAuxPpqUuPvnMLdUAm09E8Soi//PHtfLN+cxKULkp7EVLc5viD 3vfYoRz1YEcWNGPjx2zeyUKb1SbVtF/neiEc5Zttpvj63RXp6ArVLl97L7cBx0bU1JUd/GcJf46 dIAXAy9F48I4mCt3bWqcUqQW0ed+1Eou6aSdZ1yKVgzLDqkHnQRuZckre5mcy1ARKaPsrxIN78N b6Br9oQm3OjsH+oZLvtMQuqC06h0ivqG2b3+b2TvzBaJgXS8rmlgfyT2azhz5n8VY1qXtascIc9 oQ13dYH4+0QgWAnoEbg== X-Proofpoint-Spam-Info: AW1haW4tMjYwOTA3MDExOCBTYWx0ZWRfX5ekVHQPiX4Iz Gfr6bCi1VnkbUoijIo6ku6/Vin6wO0Z4bGERBZoAMQcxe23cM/veACPQz0vOGaQl1fTU8gfwygg p/WZF/BSi6lND+nnWEtdgVkyejEB6V/X1/Zj5fI4b+GTd4Nds7NE From: John Garry For a scsi_device to support multipath, introduce structure scsi_mpath_device to hold multipath-specific details. Like NS structure for NVME, scsi_mpath_device holds the mpath_device structure to device management and path selection. A module param are introduced to enable multipath - the following modes are available: - on - off - always SCSI multipath will only be available until the following conditions: - scsi_multipath enabled and implicit ALUA supported and unique ID available in VPD page 83. - scsi_multipath always mode and unique ID available in VPD page 83 The scsi_device structure contains a pointer to scsi_mpath_device; having this pointer set or unset indicates whether multipath is enabled or disabled for the scsi_device. Signed-off-by: John Garry --- drivers/scsi/Kconfig | 10 +++ drivers/scsi/Makefile | 1 + drivers/scsi/scsi.c | 8 +- drivers/scsi/scsi_multipath.c | 148 ++++++++++++++++++++++++++++++++++ drivers/scsi/scsi_scan.c | 4 + drivers/scsi/scsi_sysfs.c | 2 + include/scsi/scsi_device.h | 2 + include/scsi/scsi_multipath.h | 55 +++++++++++++ 8 files changed, 229 insertions(+), 1 deletion(-) create mode 100644 drivers/scsi/scsi_multipath.c create mode 100644 include/scsi/scsi_multipath.h diff --git a/drivers/scsi/Kconfig b/drivers/scsi/Kconfig index 4a2af0f702e1b..ffb7d12664b09 100644 --- a/drivers/scsi/Kconfig +++ b/drivers/scsi/Kconfig @@ -76,6 +76,16 @@ config SCSI_LIB_KUNIT_TEST If unsure say N. +config SCSI_MULTIPATH + bool "SCSI multipath support (EXPERIMENTAL)" + depends on SCSI_MOD + select LIBMULTIPATH + help + This option enables support for native SCSI multipath support for + SCSI host. + + If unsure say N. + comment "SCSI support type (disk, tape, CD-ROM)" depends on SCSI diff --git a/drivers/scsi/Makefile b/drivers/scsi/Makefile index 533623382eca4..8bf4e548b395e 100644 --- a/drivers/scsi/Makefile +++ b/drivers/scsi/Makefile @@ -192,6 +192,7 @@ scsi_mod-y += scsi_trace.o scsi_logging.o scsi_mod-$(CONFIG_PM) += scsi_pm.o scsi_mod-$(CONFIG_SCSI_DH) += scsi_dh.o scsi_mod-$(CONFIG_BLK_DEV_BSG) += scsi_bsg.o +scsi_mod-$(CONFIG_SCSI_MULTIPATH) += scsi_multipath.o hv_storvsc-y := storvsc_drv.o diff --git a/drivers/scsi/scsi.c b/drivers/scsi/scsi.c index 4e7e7a6b7315b..8cc33348a3637 100644 --- a/drivers/scsi/scsi.c +++ b/drivers/scsi/scsi.c @@ -64,6 +64,7 @@ #include #include #include +#include #include #include "scsi_priv.h" @@ -1042,12 +1043,16 @@ static int __init init_scsi(void) error = scsi_sysfs_register(); if (error) goto cleanup_sysctl; + error = scsi_multipath_init(); + if (error) + goto cleanup_sysfs; scsi_netlink_init(); printk(KERN_NOTICE "SCSI subsystem initialized\n"); return 0; - +cleanup_sysfs: + scsi_sysfs_unregister(); cleanup_sysctl: scsi_exit_sysctl(); cleanup_hosts: @@ -1066,6 +1071,7 @@ static int __init init_scsi(void) static void __exit exit_scsi(void) { scsi_netlink_exit(); + scsi_multipath_exit(); scsi_sysfs_unregister(); scsi_exit_sysctl(); scsi_exit_hosts(); diff --git a/drivers/scsi/scsi_multipath.c b/drivers/scsi/scsi_multipath.c new file mode 100644 index 0000000000000..5559e2e8d64a8 --- /dev/null +++ b/drivers/scsi/scsi_multipath.c @@ -0,0 +1,148 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright (c) 2026 Oracle Corp + * + */ + +#include +#include +#include +#include +#include +#include + +#include "scsi_priv.h" + +#define TPGS_MODE_IMPLICIT 0x1 + +enum { + SCSI_MULTIPATH_OFF, + SCSI_MULTIPATH_ON, + SCSI_MULTIPATH_ALWAYS, +}; + +static const char *scsi_multipath_modes[] = { + [SCSI_MULTIPATH_OFF] = "off", + [SCSI_MULTIPATH_ON] = "on", + [SCSI_MULTIPATH_ALWAYS] = "always", +}; + +static int scsi_multipath = SCSI_MULTIPATH_OFF; + +static int scsi_multipath_param_set(const char *val, const struct kernel_param *kp) +{ + int mode; + + if (!val) + return -EINVAL; + mode = __sysfs_match_string(scsi_multipath_modes, + ARRAY_SIZE(scsi_multipath_modes), val); + + if (mode < 0) + return mode; + scsi_multipath = mode; + return 0; +} + +static int scsi_multipath_param_get(char *buf, const struct kernel_param *kp) +{ + return sprintf(buf, "%s\n", scsi_multipath_modes[scsi_multipath]); +} + +static const struct kernel_param_ops multipath_param_ops = { + .set = scsi_multipath_param_set, + .get = scsi_multipath_param_get, +}; + +module_param_cb(multipath, &multipath_param_ops, &scsi_multipath, 0444); +MODULE_PARM_DESC(multipath, "turn on native multipath support, options: on, off, always"); + +static int scsi_mpath_unique_lun_id(struct scsi_device *sdev) +{ + struct scsi_mpath_device *scsi_mpath_dev = sdev->scsi_mpath_dev; + int ret; + + ret = scsi_vpd_lun_id(sdev, scsi_mpath_dev->device_id_str, + SCSI_MPATH_DEVICE_ID_LEN); + if (ret < 0) + return ret; + else if (ret == 0) + return -EINVAL; + + return 0; +} + +static int scsi_multipath_sdev_init(struct scsi_device *sdev) +{ + struct Scsi_Host *shost = sdev->host; + struct scsi_mpath_device *scsi_mpath_dev; + struct mpath_device *mpath_device; + + scsi_mpath_dev = kzalloc(sizeof(*scsi_mpath_dev), GFP_KERNEL); + if (!scsi_mpath_dev) + return -ENOMEM; + scsi_mpath_dev->sdev = sdev; + sdev->scsi_mpath_dev = scsi_mpath_dev; + + mpath_device = &scsi_mpath_dev->mpath_device; + mpath_device->numa_node = dev_to_node(shost->dma_dev); + mpath_device->access_state = MPATH_STATE_OPTIMIZED; + + return 0; +} + +static void scsi_multipath_sdev_uninit(struct scsi_device *sdev) +{ + kfree(sdev->scsi_mpath_dev); + sdev->scsi_mpath_dev = NULL; +} + +int scsi_mpath_dev_alloc(struct scsi_device *sdev) +{ + int ret; + + if (scsi_multipath == SCSI_MULTIPATH_OFF) + return 0; + + if (!(scsi_device_tpgs(sdev) & TPGS_MODE_IMPLICIT) && + (scsi_multipath != SCSI_MULTIPATH_ALWAYS)) { + sdev_printk(KERN_DEBUG, sdev, "IMPLICIT TPGS are required for multipath support\n"); + return 0; + } + + ret = scsi_multipath_sdev_init(sdev); + if (ret) + return ret; + + ret = scsi_mpath_unique_lun_id(sdev); + if (ret < 0) + goto out_uninit; + + return 0; + +out_uninit: + scsi_multipath_sdev_uninit(sdev); + return 0; +} + +void scsi_mpath_dev_release(struct scsi_device *sdev) +{ + struct scsi_mpath_device *scsi_mpath_dev = sdev->scsi_mpath_dev; + + if (!scsi_mpath_dev) + return; + + scsi_multipath_sdev_uninit(sdev); +} + +int __init scsi_multipath_init(void) +{ + return 0; +} + +void __exit scsi_multipath_exit(void) +{ +} + +MODULE_LICENSE("GPL"); +MODULE_DESCRIPTION("scsi_multipath"); diff --git a/drivers/scsi/scsi_scan.c b/drivers/scsi/scsi_scan.c index 96e4065ae8b55..f7a782568faac 100644 --- a/drivers/scsi/scsi_scan.c +++ b/drivers/scsi/scsi_scan.c @@ -46,6 +46,7 @@ #include #include #include +#include #include "scsi_priv.h" #include "scsi_logging.h" @@ -1130,6 +1131,9 @@ static int scsi_add_lun(struct scsi_device *sdev, unsigned char *inq_result, sdev->max_queue_depth = sdev->queue_depth; WARN_ON_ONCE(sdev->max_queue_depth > sdev->budget_map.depth); + if (scsi_mpath_dev_alloc(sdev)) + return SCSI_SCAN_NO_RESPONSE; + /* * Ok, the device is now all set up, we can * register it and tell the rest of the kernel diff --git a/drivers/scsi/scsi_sysfs.c b/drivers/scsi/scsi_sysfs.c index fe54792ed69e4..6a68da42df913 100644 --- a/drivers/scsi/scsi_sysfs.c +++ b/drivers/scsi/scsi_sysfs.c @@ -23,6 +23,7 @@ #include #include #include +#include #include "scsi_priv.h" #include "scsi_logging.h" @@ -456,6 +457,7 @@ static void scsi_device_dev_release(struct device *dev) might_sleep(); scsi_dh_release_device(sdev); + scsi_mpath_dev_release(sdev); parent = sdev->sdev_gendev.parent; diff --git a/include/scsi/scsi_device.h b/include/scsi/scsi_device.h index 8694eeadd753e..1d1356a21c3a5 100644 --- a/include/scsi/scsi_device.h +++ b/include/scsi/scsi_device.h @@ -280,6 +280,8 @@ struct scsi_device { struct device sdev_gendev, sdev_dev; + struct scsi_mpath_device *scsi_mpath_dev; + struct work_struct requeue_work; struct scsi_device_handler *handler; diff --git a/include/scsi/scsi_multipath.h b/include/scsi/scsi_multipath.h new file mode 100644 index 0000000000000..d3d410dafd17a --- /dev/null +++ b/include/scsi/scsi_multipath.h @@ -0,0 +1,55 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#ifndef _SCSI_SCSI_MULTIPATH_H +#define _SCSI_SCSI_MULTIPATH_H + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#ifdef CONFIG_SCSI_MULTIPATH +#define SCSI_MPATH_DEVICE_ID_LEN 256 + +struct scsi_mpath_device { + struct mpath_device mpath_device; + struct scsi_device *sdev; + + char device_id_str[SCSI_MPATH_DEVICE_ID_LEN]; +}; +#define to_scsi_mpath_device(d) \ + container_of(d, struct scsi_mpath_device, mpath_device) + +int scsi_mpath_dev_alloc(struct scsi_device *sdev); +void scsi_mpath_dev_release(struct scsi_device *sdev); +int scsi_multipath_init(void); +void scsi_multipath_exit(void); +#else /* CONFIG_SCSI_MULTIPATH */ + +struct scsi_mpath_device { +}; + +static inline int scsi_mpath_dev_alloc(struct scsi_device *sdev) +{ + return 0; +} +static inline void scsi_mpath_dev_release(struct scsi_device *sdev) +{ +} +static inline int scsi_multipath_init(void) +{ + return 0; +} +static inline void scsi_multipath_exit(void) +{ +} +#endif /* CONFIG_SCSI_MULTIPATH */ +#endif /* _SCSI_SCSI_MULTIPATH_H */ -- 2.43.7