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 bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (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 24550C433FE for ; Thu, 20 Oct 2022 10:36:23 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help :List-Post:List-Archive:List-Unsubscribe:List-Id:MIME-Version:Content-Type: Content-Transfer-Encoding:References:In-Reply-To:Message-Id:Date:Subject:Cc: To:From:Reply-To:Content-ID:Content-Description:Resent-Date:Resent-From: Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=Bq4nxhdkdi0kdenlVbgoq6mtI8OUGz8na7GBkH8UT54=; b=2acBz9lfkKvLO/SR+eTbW1Pu3l OjuU9uw7xoRC8OUUWT2qnmbUmL1+W45E4uNhk0VqXP7B9ao1+6dGTkbV65VWitI6lndbHZd0zXzlf kZNjqMSzl0ZunCxhuHCtdkuTWLsJiJf3Dr71d/aLG1KjtSAFhFQ8S/Ydswjpapzkj41gt5f00ODZq wn/h1J9x85kaiopucJ3sSG4JnBGF9arJZCaD/QXFB75OGwXcd+jT/mTAdLKVrBHn8NhFKr/NjwRnJ 1/GfECSy7KnZob988bHje1deg0p+9ahvtQJK1eABbqLMjyUzEpsG4iSCyQBAxcAFmOpw84x826zwo z6YSk7XA==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1olSuQ-00Ddck-MA; Thu, 20 Oct 2022 10:36:19 +0000 Received: from mail-bn1nam07on2062.outbound.protection.outlook.com ([40.107.212.62] helo=NAM02-BN1-obe.outbound.protection.outlook.com) by bombadil.infradead.org with esmtps (Exim 4.94.2 #2 (Red Hat Linux)) id 1olSdh-00DSlg-EX for linux-nvme@lists.infradead.org; Thu, 20 Oct 2022 10:19:02 +0000 ARC-Seal: i=1; a=rsa-sha256; s=arcselector9901; d=microsoft.com; cv=none; b=mOZYc7NMs8y5qDPWa+zYYwlvWH+nFy63Iij1MS7OzjKSBMK0IYmwrMtin3n/L+wVxkDL92Bapzq4jZvIZ494i/yi2Rh+TH03Wgkn8eSegDsSMZxLU2z7PiInmaS2zYNIt+TSGBOiDUY9kXU0fi86pCfFwYfEyYiFgfVHogh0wsyOs+71Wg248f10hLc3DFAQXsBsHbzEKGol3f4iyzzUFx/JnOIrDfRTJFrA+wE4CKZbD9PhdsmeK3ZkFJsn/QFyKlta6nrMa1z/0svEo25ToG9WIPBL+k4l8D4G5yTaBqUU6vOjT3jcLIkqa6TDtI0X7dSerha+ZRNyvwxytNR8Ig== 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-AntiSpam-MessageData-ChunkCount:X-MS-Exchange-AntiSpam-MessageData-0:X-MS-Exchange-AntiSpam-MessageData-1; bh=Bq4nxhdkdi0kdenlVbgoq6mtI8OUGz8na7GBkH8UT54=; b=J23UXC4UYoxIdChwH9XU31ScuNwc1IpwcNZAtHo71OHGXs2Lw5usIgv++MxJkqiIYtaEkeI2ZOF5ZfdvD+WbQOJ6dNJAuOzXPg9/A6vHjG/eW+Ye27ny4lWSZQPQEHySEKRYpJinSEZIPhpt+5FbNiWf0KkxrMg7CbKCDL6z8F7LXYsWYyxuQtnJX1t3475kdLEuOWmMgVm/fp+wHHSknV0Q0aTZrB2iCjWDKfsYTtPgae9R1hg/2KF8Wj4HFDClyRSw3grfeW1hOuB4ENwd4IfSfLsvTXIf/Vq084d/epNAJlCcoDUcG98JcTL5cNnF2uAhPVpScpXR5uvyu6IAkw== ARC-Authentication-Results: i=1; mx.microsoft.com 1; spf=pass smtp.mailfrom=nvidia.com; dmarc=pass action=none header.from=nvidia.com; dkim=pass header.d=nvidia.com; arc=none DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=Nvidia.com; s=selector2; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck; bh=Bq4nxhdkdi0kdenlVbgoq6mtI8OUGz8na7GBkH8UT54=; b=VelAZh3PsTcWB3xaW9V1xiSBG8VstCfGWg4E7a4v62n5waxmPpEW3aAifFwmFz7iuqdLABldPo6/LD0sAN+e5+9IKoYkeyKvuaLnfn2tdBp8a4DcMtyuKjnDIEdhX3jNEGtDb0YUEbis4o7MM05n0Ey1tTpE5+8LMugfgGRVw8DT6tk08zA5HNCh505GwHmJlUt124hA19OBHG6/9kwYUjRUXHneLhg0iT6le6t9AYjJdD5x4YomCYaykvtcU+KBRbGw8azarsLrq0jf/2qraiAlNSBQR8CWDLnvbmrGTt6dHTcLTnuqYi7NV8Qaw6vYpYIoz4U2xVH8YrlyDSKgHg== Authentication-Results: dkim=none (message not signed) header.d=none;dmarc=none action=none header.from=nvidia.com; Received: from SJ1PR12MB6075.namprd12.prod.outlook.com (2603:10b6:a03:45e::8) by IA1PR12MB7568.namprd12.prod.outlook.com (2603:10b6:208:42c::10) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.5723.29; Thu, 20 Oct 2022 10:18:57 +0000 Received: from SJ1PR12MB6075.namprd12.prod.outlook.com ([fe80::b8be:60e9:7ad8:c088]) by SJ1PR12MB6075.namprd12.prod.outlook.com ([fe80::b8be:60e9:7ad8:c088%3]) with mapi id 15.20.5723.033; Thu, 20 Oct 2022 10:18:57 +0000 From: Aurelien Aptel To: netdev@vger.kernel.org, davem@davemloft.net, kuba@kernel.org, edumazet@google.com, pabeni@redhat.com, saeedm@nvidia.com, tariqt@nvidia.com, linux-nvme@lists.infradead.org, sagi@grimberg.me, hch@lst.de, kbusch@kernel.org, axboe@fb.com, chaitanyak@nvidia.com Cc: smalin@nvidia.com, aaptel@nvidia.com, ogerlitz@nvidia.com, yorayz@nvidia.com, borisp@nvidia.com, aurelien.aptel@gmail.com, malin1024@gmail.com Subject: [PATCH v6 02/23] iov_iter: DDP copy to iter/pages Date: Thu, 20 Oct 2022 13:18:17 +0300 Message-Id: <20221020101838.2712846-3-aaptel@nvidia.com> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20221020101838.2712846-1-aaptel@nvidia.com> References: <20221020101838.2712846-1-aaptel@nvidia.com> Content-Transfer-Encoding: 8bit Content-Type: text/plain X-ClientProxiedBy: LO4P123CA0661.GBRP123.PROD.OUTLOOK.COM (2603:10a6:600:316::15) To SJ1PR12MB6075.namprd12.prod.outlook.com (2603:10b6:a03:45e::8) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: SJ1PR12MB6075:EE_|IA1PR12MB7568:EE_ X-MS-Office365-Filtering-Correlation-Id: 397099e2-14ae-4fdf-b0b3-08dab2847f77 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; 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:SJ1PR12MB6075.namprd12.prod.outlook.com;PTR:;CAT:NONE;SFS:(13230022)(4636009)(136003)(39860400002)(376002)(396003)(346002)(366004)(451199015)(921005)(6486002)(38100700002)(478600001)(6506007)(36756003)(2616005)(4326008)(6636002)(86362001)(316002)(66946007)(66556008)(8676002)(6666004)(186003)(66476007)(5660300002)(1076003)(6512007)(26005)(2906002)(8936002)(7416002)(83380400001)(41300700001);DIR:OUT;SFP:1101; X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: =?us-ascii?Q?gOMxAwGLjM50M7NGbB2wGI5+Dp+ZpbfIkNodoGAGPB6IbKQ90Y8w7l/aVvW4?= =?us-ascii?Q?g63htzWMTp3sOuDG3YDDZIrxt01zi0NAAM4BVHLyCE+6YpyglX0ZHEq5R5M+?= =?us-ascii?Q?mHfEMVRlBSBv5sq0ZvMVycx7FxZvrUkieky7sZQVAlBlIDVBUIlp1NHOO/wY?= =?us-ascii?Q?0xqY+G+D23tBQHVp6w1DV4faZFbBJYjby0VvNsCmytQYjV42gy99FkNL+kEI?= =?us-ascii?Q?Wpvi9bZe8zqh/hTKf/Kh4r8/XNzeqZSI86T61IQtYznORNO+ZV1xKnkL15Mb?= =?us-ascii?Q?8OJU5dJLIJ1OSfZLuUVPY2kWJbDEcxNfMMK8ZMKvMNJ/cIfr2vYPbMrIiBo+?= =?us-ascii?Q?BvQ19Ph7Z95Q8t5VjmZLxnGm97oQNv/qWm/lU/H0yDzyf7qhPli7MJOKfCeo?= =?us-ascii?Q?8JjV4bs4QxUbIAOQ6Kc8ywp+dLqBrs60pdpH2lHBCl/YCyL+lAB7RGyq1SnI?= =?us-ascii?Q?rq/9hRq2GvUR4zNbrVy9zx7hdEFL3pAP8gWF1KWYZPyJ9iavMePaJtbeK0MM?= =?us-ascii?Q?vOuse3+YirvOXk5oKPETU5oepAbDc3uNVZ0WqVYQdV/LMPeaV2JCBArPmpFY?= =?us-ascii?Q?wwkb6SbphHDSNhQuAdLEaVdtfoSR2WFc4DXr2/tVchzMNkaHlcSftNHWr4hh?= =?us-ascii?Q?h03/w3RgEOLLXsL0CWmnJZHzV7cRH1UrxmA/Z0cZ9V7f+L6kIjsk82dtAem3?= =?us-ascii?Q?3c3Hz5fGjU8j9OQMXBxw7NzBfGfaHOBAJxkOGaf/ECAGk5UrETcUVlCngEVE?= =?us-ascii?Q?TImu6Xwcrb9iIMlnbvf+QD80PbmJZUmiJWMxrS6VRGYQcMfL643UHv7qkKzh?= =?us-ascii?Q?3+ZocTPAbsb7VPDfylpcM/GHVRa2eHUzvRKAbQC2uaFBkMoYT+iOjx2d5ZN9?= =?us-ascii?Q?/1YGMZ/puwU8lWiTdgsgBhQKr8wPfS3GRtNptvjX9wX51CKHgDLJB4CS7eIm?= =?us-ascii?Q?9QDt5vbpc2ndJm6/T0y4RlKxSFTgGxy6lYYdoQKa9uzdFH9p514j/fD1G2fn?= =?us-ascii?Q?TjJauU8qjqp4v4dN/chHugdJlbdOpHLv+1zu0NaWhkxUwLz58IFrOMTGQ6Wk?= =?us-ascii?Q?yyYX4pEe18vXWkGxO5DskzJHjFGFDKQ/LYWuu/+cfhBSax9kA/fEtNfURniV?= =?us-ascii?Q?jIgVnEZqsAkgRHifexP9fiGdoHQOZbI6xeSyq6x5kby2szsE3bpq+BvViAQw?= =?us-ascii?Q?ucbBT9v4n7iPBhZem5b2eHoo3dxoIN6Gr5+fh0w/oR+Lx9jpSZ+6FqZ4Q/6G?= =?us-ascii?Q?RZhL7OniAIRBty4H77dxpmNVPc9CIQ0zBQk2s82aTpncKVuz/+Bhs41FDd9b?= =?us-ascii?Q?PUixS2wwEW7QakP1H/nNBsfNgNsHkPkmWbO97bBYCGB03AfAUvR0OsM/++er?= =?us-ascii?Q?hphFqtol6lU+7IS+NJjhxbOPnb83pv2TkHGiAzRXb83ioukYXq0+GBflK46E?= =?us-ascii?Q?tkPrYcOepu5cXh6bDfXnDS3dTrZXaZqJ6VdUyRuSjCA6qdG2PWE/ZKS2Mw6n?= =?us-ascii?Q?wv0R5TmK1sPLD2w1z+3ta3fFTVtr4PSMbkf46DkrjGQbCj4j531wj3rutpyI?= =?us-ascii?Q?TEO2Pos6tmMWuoY2QJHM2hrDY7tQ4/kO2evgKfSW?= X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-Network-Message-Id: 397099e2-14ae-4fdf-b0b3-08dab2847f77 X-MS-Exchange-CrossTenant-AuthSource: SJ1PR12MB6075.namprd12.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 20 Oct 2022 10:18:57.1105 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: 43083d15-7273-40c1-b7db-39efd9ccc17a X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: LLdTPBLLbnAHrKOMC0ZY5U7ehthel7jClm+gi4Q0/sK2MlZ/o73V3oZSbSfEZ5mD/ySdaG9WWPMvn6/bMov9+Q== X-MS-Exchange-Transport-CrossTenantHeadersStamped: IA1PR12MB7568 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20221020_031901_586083_92260C90 X-CRM114-Status: GOOD ( 11.62 ) X-BeenThere: linux-nvme@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "Linux-nvme" Errors-To: linux-nvme-bounces+linux-nvme=archiver.kernel.org@lists.infradead.org From: Ben Ben-Ishay When using direct data placement (DDP) the NIC writes some of the payload directly to the destination buffer, and constructs SKBs such that they point to this data. To skip copies when SKB data already resides in the destination we use the newly introduced routines in this commit, which check if (src == dst), and skip the copy when that's true. As the current user for these routines is in the block layer (nvme-tcp), then we only apply the change for bio_vec. Other routines use the normal methods for copying. Signed-off-by: Ben Ben-Ishay Signed-off-by: Boris Pismenny Signed-off-by: Or Gerlitz Signed-off-by: Yoray Zack Signed-off-by: Shai Malin Signed-off-by: Aurelien Aptel Reviewed-by: Chaitanya Kulkarni --- lib/iov_iter.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/lib/iov_iter.c b/lib/iov_iter.c index c3ca28ca68a6..75470a4b8ab3 100644 --- a/lib/iov_iter.c +++ b/lib/iov_iter.c @@ -526,7 +526,7 @@ size_t _copy_to_iter(const void *addr, size_t bytes, struct iov_iter *i) might_fault(); iterate_and_advance(i, bytes, base, len, off, copyout(base, addr + off, len), - memcpy(base, addr + off, len) + (base != addr + off) && memcpy(base, addr + off, len) ) return bytes; -- 2.31.1