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 5E3DA42A7BB; Thu, 23 Jul 2026 09:38:26 +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=1784799508; cv=fail; b=SQN70nubfu98AoWV7fg1WYd1F2ds38AhwEj7IoHThIt6DNMi9IiM3bA1cT2zJV9/LpmESBhpK9aFC1lz7khJ3YweT0ntrX3BAsAEL26vKFxsTegu/Y3MkacN/LGbfsmHw6onU/PELn0jNgx23t/LD87PXqsdtWgeGoaWYHU1LO0= ARC-Message-Signature:i=2; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1784799508; c=relaxed/simple; bh=6PpzII+tLOGLjy0Xa2gKITREMUr66wbpnSdMBH+cyx8=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: Content-Type:MIME-Version; b=boM8n4FJWYTQjh3QZEyBKmiHcQoxUXvZnnylvW1SKYr2oNoZpJnqpTbkk5f/uFZXLUW2dIVVW0wGDNaKMN5EkukpV/cYYejWNggcQGYbsRmISMYfeTuUjlaMwyu0eViHQxVMVswHNBZRdPreS4Ht9rxStzf/z4kMDJ+3hrD9Q4M= 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=p9/nOtwi; dkim=pass (1024-bit key) header.d=oracle.onmicrosoft.com header.i=@oracle.onmicrosoft.com header.b=UaanbVZ4; 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="p9/nOtwi"; dkim=pass (1024-bit key) header.d=oracle.onmicrosoft.com header.i=@oracle.onmicrosoft.com header.b="UaanbVZ4" 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 66MJthbn3353529; Thu, 23 Jul 2026 09:37:10 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=8WY5zpBveHhpGo39RTEV8d6/FM9E1MSDdqlGBk7PMbQ=; b= p9/nOtwiuGBO97yz/AcYGBo44ZWZ2WqsuHAkwI5LGvXoqxQvy5Q7r5Iwv6xAzu0y pXLcxpql7WUx67IIfmed3h6Wgir2KhJaGITIX5E1ijvhQj8m9S9Uw4uSCwWBFiuV GEQWX9FhoI6J2K6ZeMDF1iKPtb1RmGY0jUYxAookjPYsNbHvrpaIkubNz1/QAbRQ S1y5GcwG2YgoEASW/W4VTGS6DDLxK4BWYMzgwiv582XmNl/dJjSThpmQ2WO5sHek DOrxRlTLR14dieaWOMm9pCmTVtDNSF69BmpoblSs7Gw7JZ0cwJYW+tblQ3oyXW0g 5ltvDQQFswYd8s6qY5NZMA== Received: from iadpaimrmta02.imrmtpd1.prodappiadaev1.oraclevcn.com (iadpaimrmta02.appoci.oracle.com [147.154.18.20]) by mx0b-00069f02.pphosted.com (PPS) with ESMTPS id 4fg1mv6kp0-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Thu, 23 Jul 2026 09:37:10 +0000 (GMT) Received: from pps.filterd (iadpaimrmta02.imrmtpd1.prodappiadaev1.oraclevcn.com [127.0.0.1]) by iadpaimrmta02.imrmtpd1.prodappiadaev1.oraclevcn.com (8.18.1.7/8.18.1.7) with ESMTP id 66N9XYnq030082; Thu, 23 Jul 2026 09:37:10 GMT Received: from ch1pr05cu001.outbound.protection.outlook.com (mail-northcentralusazon11010003.outbound.protection.outlook.com [52.101.193.3]) by iadpaimrmta02.imrmtpd1.prodappiadaev1.oraclevcn.com (PPS) with ESMTPS id 4ffyxs5xfk-2 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=FAIL); Thu, 23 Jul 2026 09:37:09 +0000 (GMT) ARC-Seal: i=1; a=rsa-sha256; s=arcselector10001; d=microsoft.com; cv=none; b=k8T33upQZRsMrxNWJwBT88d33Kye6cDNWH+SqvpU3gz2jVLov3/rd+M6+dzeUyMpy4Oizav118xdlL9GD59Df5wrUABQMyaFL/z8t32lNrE+qRpv2C+23oB0Yk8RPEwsa8e2i4K7HpuJ3mPYSaNgmsuQUm+rwX5qoGVwYbPT9C5vIq6XUKxqRHelOIeVfrfwIEcb+O2ZFG8/kW1c3GdtT8SxF+jRBmFfTNY4jyaK0Yk9TpVRse+VyEzF6xtAK34cyM9V9G43WZ2lZomdB9AI8HG2Z8GYz+wF/s+MhVEHdVUMjpF+CaCCPm05cC+QlmLKS9zs4GQwowcCfSf9+H4xJw== 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=8WY5zpBveHhpGo39RTEV8d6/FM9E1MSDdqlGBk7PMbQ=; b=M/Rvs1kJ3mIrtMVuYMYOIEBvpOVkKCujt4QsqgaII7SBH6b9WWws4xyhk3ZPHC6prstXnfpDE2GHvRmmRKrFppFqj84IWv6kx33mnWjY/E9BAvkEPchlpIZK1VQgIdgwYUW+Eo5L+9R6cclAD03gCTt56NfttQlMd8iHgJmBKCvTf6TYs3H0vg7HT+9qAf3PM+fR2BZuMX7VsveeoiTioZDj7kr/bFvhFL08W1qvyr3Ec3mrHPMx1Vk/yVRDYtJUcH+WM5r0VftUfoSZVt7TuVDV3fr07sHpLOpwu5eFvBQlsb4rDiHtENT+cywHPwNqDeHRxZTJH3778gKpZRewhg== 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=8WY5zpBveHhpGo39RTEV8d6/FM9E1MSDdqlGBk7PMbQ=; b=UaanbVZ4NCvi0wkvPJQICcdKt/dBe8a1NeBUHTRen+60EbN1fWE2qhSyqamqOk62/cOWOdpb76Fv0NauamG5h6TqH04lOISUJRxK6sZnm57YRQw4PJwxr/tsPPyNRUF7QFsepaQYpqlF8bgT15Hus9abNWaeXZbjmsftQRtFw4Y= Received: from DM4PR10MB6229.namprd10.prod.outlook.com (2603:10b6:8:8c::12) by DM3PPF2FC05F2F4.namprd10.prod.outlook.com (2603:10b6:f:fc00::c16) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.21.245.11; Thu, 23 Jul 2026 09:37:07 +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 15.21.0245.009; Thu, 23 Jul 2026 09:37:07 +0000 From: John Garry To: martin.petersen@oracle.com, james.bottomley@hansenpartnership.com, hare@suse.com 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, John Garry Subject: [PATCH v4 12/28] scsi-multipath: introduce basic SCSI device support Date: Thu, 23 Jul 2026 09:36:10 +0000 Message-ID: <20260723093627.2327456-13-john.g.garry@oracle.com> X-Mailer: git-send-email 2.43.7 In-Reply-To: <20260723093627.2327456-1-john.g.garry@oracle.com> References: <20260723093627.2327456-1-john.g.garry@oracle.com> Content-Transfer-Encoding: 8bit Content-Type: text/plain X-ClientProxiedBy: CH5P221CA0022.NAMP221.PROD.OUTLOOK.COM (2603:10b6:610:1f2::23) To DM4PR10MB6229.namprd10.prod.outlook.com (2603:10b6:8:8c::12) Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: DM4PR10MB6229:EE_|DM3PPF2FC05F2F4:EE_ X-MS-Office365-Filtering-Correlation-Id: b22a8c71-72ec-4186-233c-08dee89df5eb X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|376014|7416014|23010399003|1800799024|366016|56012099006|10067099003|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)(7416014)(23010399003)(1800799024)(366016)(56012099006)(10067099003)(22082099003)(18002099003);DIR:OUT;SFP:1101; X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: =?us-ascii?Q?odsM6570R3n6qwlUfnYqqqWSQVJVje6OHENG4DQjf33IU67HP4tbVf/d4Ikr?= =?us-ascii?Q?uDzX+tmXq2pwEhg+o4MiLoI85tkMkPz1FnCFnNW+Wv1fe++SZCOF0Kmwn2Rw?= =?us-ascii?Q?j2YuI2QuDiDSIxUonFMjwX1gzyDw8fZ7aAii7Dn+Z54b2moGOvmbPZjFnhpl?= =?us-ascii?Q?LMfqCihirC/fuOJgANqC9gc4I3sZ+nLLVsylaytFv0m9V1kwrcOlmUTynwwG?= =?us-ascii?Q?clfeIPL0hFYb4PuaCw4uYGZE01wNjRsDyN+yOH8j4UGT9+T2axdayMb0jTPy?= =?us-ascii?Q?/wkRP3M0tqb9lQUG7onsvtWNMvCoSUoP1ffAGU7CwtfaTkQpN+oB7/GiAne9?= =?us-ascii?Q?7oEc61H4+hJSER1tUD1O2Az+a4KZJapDYEqc1EXmIi3rom06WXVyf8b28M/K?= =?us-ascii?Q?MEHmHGpL9tvPIY8usQNAPVdxUuZxGrjRtasFRcIA7IYzoTBlqi/NGVR4w9cG?= =?us-ascii?Q?ddlmmgBYVHrYomF8pQngAsaPIsRz/IrYKhAL+WIw0fRKL51ylAs1DDXrTJOk?= =?us-ascii?Q?v46hGZqflJPqtvePn7NdcYgvdkO7yfi7Wf6fhN8Mc59uuE+oHpRjndiTk3+i?= =?us-ascii?Q?OQmDrz51apCqfPZiODnVkMK2L8LGDTmAdOKqw3y0QWmgiDVNWWAuceBecdEY?= =?us-ascii?Q?PFDVi4l4eoIG6ucckDEfu1b0TBPGSgVOHzjEWeUWtMTtYSz4eZSPBUnS+xiA?= =?us-ascii?Q?pU+6hYJIGOjxsxiQGmHRf8SYGSlCEX8LW4EAcbClglD1VGeSWRolELF4Zlog?= =?us-ascii?Q?XsHAI2NY1tmJgOJTZMicwO2RJsOfajTr/9ieWgPxVJ9DmME7r9eW9KSm5tuG?= =?us-ascii?Q?D9Lunia35XM3cqAAw5tubDIO9wpK469u/xCOoBTc9EUrY2L1FlJ40yhAYqtq?= =?us-ascii?Q?uGGl1f1WIuVy+e+huRHkDDNPmvTtl8A8E4W1SoV1Cy4OrfjHtGmkG8lcnxDx?= =?us-ascii?Q?yK/SgBBAW1Bv951tfofFt81zsbxmzd3peSRCVH3yWTKH3UC1kh+s3y+MDChD?= =?us-ascii?Q?fCdTlgFPIOmgqvtEQTwTKdm5Yddl4gIJCAoZUdoR9TGUOhP26qZyuKJBzAn4?= =?us-ascii?Q?HKeM4WwW2f3WPDtXC/lwZcyHKUxTr1HUPr9ttI0rw/JLL62pdDzVzMvCsZGC?= =?us-ascii?Q?lmR875J8a8uuVf27fmKZ5fWtvcN0GKAdSuM+48OsljFns9y54/PW1HRmCAv5?= =?us-ascii?Q?0gLaE5nKxFRSGQ3VbEqPsmIKGVxsy4VtX1gbfnnBGOYOSkKhA7XYc5YibE7S?= =?us-ascii?Q?V5s7T2zxHZJLije5BjBpXx5booYabWT7tOKcvD7Ipbl48AcC96C2redsUkHH?= =?us-ascii?Q?NY2Y3WzMdDzV7YcUfiMdq6A6wDOKWKqZCkZWJ35QhBqWLlNRZ9WZLq3i1nHr?= =?us-ascii?Q?GYdaEsrGKF1481t7MEDWmgqq++ANG1nRGyFVvasa/LJt1jiuQsshEQ0/zGW8?= =?us-ascii?Q?uhXUVwsTl5nh9cMb9KPUuKNjXFxsvP7AOIyrdwGOFf8MFzFBom9SxIU7VRnV?= =?us-ascii?Q?OI9UDOWxm3+X2V763JRfNcQv7ZvoisOy22Xj7zJaCaIaA4HJv3cKLb+ylUxF?= =?us-ascii?Q?mzFDAPQX3YiGF28cHlKn5iKivhSUMHW8d3vZjxfWDRD0uuMlfEHfCfupsxU0?= =?us-ascii?Q?+r3ycngeJH+Uixyy31saQIYg+73DqhOXGxLDlCjVcEXSHcJFB/4acSpC98d4?= =?us-ascii?Q?tmgeGR73uxgdmpJU6k+ojyM1ILT+DLb0uh3KfLtAQKarGQwIbdcNaCVDjbCg?= =?us-ascii?Q?AN+B9w51SQ=3D=3D?= X-Exchange-RoutingPolicyChecked: rGYLvW9qRtdt/UMZSqxpOxdgAcA36fb6hOt2t+Of/LTUZfff8hoc3MyVeMcYBdNeUFwv32uv4RgflkJyOfCtW3sUbuzr7WsWkB3okfOVITFQuw/iTqzzl5S3Ex1/taI3BoXBe4P3Y5fSa4i1ZzeBlxtuW3lc7mNtMWyq6iuqpFCuXEzp0aH4C/cKUXZgKUxmK6t2c4cdPLr48ejwHeey4EirYMYM+WwXU4zOGvICQHY6ago3eZoGJd/W9dxpzO9i1BfpJAVUHXwt8ITwh+MSF6keMUgPcVpQ9EiJ6UeWIztivi6cgRFg1PEdUhc8nmlMHLPTw4xgrR2T4Y4oo38Wjg== 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: b22a8c71-72ec-4186-233c-08dee89df5eb X-MS-Exchange-CrossTenant-AuthSource: DM4PR10MB6229.namprd10.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 23 Jul 2026 09:37:06.8878 (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: HI3Fi4/UL0vnyU3ZvdFuxmMH1xP4g3qkQWIvtn5t7nklRuVMDHUiYcy3y4fIjIAEZQx+Pl4g8LDvWYh3x9/QtA== X-MS-Exchange-Transport-CrossTenantHeadersStamped: DM3PPF2FC05F2F4 X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1143,Hydra:6.1.134,FMLib:17.12.100.49 definitions=2026-07-23_03,2026-07-22_02,2025-10-01_01 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 suspectscore=0 mlxlogscore=999 lowpriorityscore=0 malwarescore=0 bulkscore=0 phishscore=0 mlxscore=0 adultscore=0 spamscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.19.0-2606160000 definitions=main-2607230094 X-Proofpoint-GUID: FaIsBb0QXqF7LhC5lVw-H-FJeQO3yrLy X-Proofpoint-Spam-Info: AW1haW4tMjYwNzIzMDA5NSBTYWx0ZWRfX/tk3EVW0dHdC jrYg0d0zedWrsIgfNm5PlHryQAhvLRSdOXNE147zBLnWLCerEhEDu9+ZuiZan43hl5zBg52SMIg 92YzGFYMajF7qpOCs7Jts+C1bCZih6CvDbrshdI6ai0aMsyGJeEt X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwNzIzMDA5NSBTYWx0ZWRfX0DOcrwYNvpE2 26XKfTn9iMFVOMc4rHhgCQMHGlTVYhLvGODruYvjnZndBYj9ExvK2GzG7NhgTLtITmRwklhklOh 3jCJNKhYao29Eh72kd+r7Fg8FUfDZRNnvjA5CSR15DeGIpgXCPdftg2XF0UFMtsigypB8X8BVPn Ssk6kOOJM8LC0cHxczsod2GJz+GQAxaKciq4R2msswdw/WbzwoAEvFQf1w7BmlSbonIKviVetSo dZEd463hAzSsNMayYax/ZdSNnSCIJg7Nk/CQbN74eHsb+zhTcRdF3vbyCJN8Njd9nGeOyw9U+F4 QjF/GMJrXIrnddXbezNi7HflfDEd+RzqBge386kufvQRS0uMGiSyAGiL6jlCeQVZaUQtdjWAFVA F7c7bOIKWbDyjowKf457I9Q6NXTJn9M8yLdmIxU1ljgE7nEWHXWKynFUp0qbEDOLlzdIZ17ws1O 5MebD2Dn77WbOHcPyIj3sMipK4eW640U88TT2CAM= X-Authority-Analysis: v=2.4 cv=ZpPd7d7G c=1 sm=1 tr=0 ts=6a61e0c6 b=1 cx=c_pps a=e1sVV491RgrpLwSTMOnk8w==:117 a=e1sVV491RgrpLwSTMOnk8w==:17 a=6eWqkTHjU83fiwn7nKZWdM+Sl24=:19 a=z/mQ4Ysz8XfWz/Q5cLBRGdckG28=:19 a=lCpzRmAYbLLaTzLvsPZ7Mbvzbb8=:19 a=xqWC_Br6kY4A:10 a=RAioF0-LDSMA:10 a=GoEa3M9JfhUA:10 a=VkNPw1HP01LnGYTKEx00:22 a=jiCTI4zE5U7BLdzWsZGv:22 a=x4eqshVgHu-cdnggieHk:22 a=yPCof4ZbAAAA:8 a=pCOl5fTshOrEa-n2-VQA:9 a=5yU3S35YU4bGjq-dph-N:22 a=Bho9c0fBagfJEIQBS7DQ:22 cc=ntf awl=host:13523 X-Proofpoint-ORIG-GUID: FaIsBb0QXqF7LhC5lVw-H-FJeQO3yrLy 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 | 146 ++++++++++++++++++++++++++++++++++ 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, 227 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 c3042393af234..d6c31df454825 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 842c254bb2269..04f9c2e51fcbd 100644 --- a/drivers/scsi/Makefile +++ b/drivers/scsi/Makefile @@ -168,6 +168,7 @@ 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 76cdad063f7bc..70aa1dbeacebf 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..b9b58a3641aa2 --- /dev/null +++ b/drivers/scsi/scsi_multipath.c @@ -0,0 +1,146 @@ +// SPDX-License-Indentifier: 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; + + 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 e27da038603a2..3f1ac302719c2 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 dfc3559e7e04f..2f80d703ce640 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" @@ -455,6 +456,7 @@ 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 029f5115b2ea0..40a435e66b34e 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