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GET /api/patches/104008/?format=api
{ "id": 104008, "url": "https://patches.dpdk.org/api/patches/104008/?format=api", "web_url": "https://patches.dpdk.org/project/dpdk/patch/20211108164101.26308-1-viacheslavo@nvidia.com/", "project": { "id": 1, "url": "https://patches.dpdk.org/api/projects/1/?format=api", "name": "DPDK", "link_name": "dpdk", "list_id": "dev.dpdk.org", "list_email": "dev@dpdk.org", "web_url": "http://core.dpdk.org", "scm_url": "git://dpdk.org/dpdk", "webscm_url": "http://git.dpdk.org/dpdk", "list_archive_url": "https://inbox.dpdk.org/dev", "list_archive_url_format": "https://inbox.dpdk.org/dev/{}", "commit_url_format": "" }, "msgid": "<20211108164101.26308-1-viacheslavo@nvidia.com>", "list_archive_url": "https://inbox.dpdk.org/dev/20211108164101.26308-1-viacheslavo@nvidia.com", "date": "2021-11-08T16:41:01", "name": "doc: describe timestamp limitations for mlx5", "commit_ref": null, "pull_url": null, "state": "accepted", "archived": true, "hash": "e7f8b9211ac13313b0e0f82c9e7b9fe4d35030ad", "submitter": { "id": 1926, "url": "https://patches.dpdk.org/api/people/1926/?format=api", "name": "Slava Ovsiienko", "email": "viacheslavo@nvidia.com" }, "delegate": { "id": 3268, "url": "https://patches.dpdk.org/api/users/3268/?format=api", "username": "rasland", "first_name": "Raslan", "last_name": "Darawsheh", "email": "rasland@nvidia.com" }, "mbox": "https://patches.dpdk.org/project/dpdk/patch/20211108164101.26308-1-viacheslavo@nvidia.com/mbox/", "series": [ { "id": 20398, "url": "https://patches.dpdk.org/api/series/20398/?format=api", "web_url": "https://patches.dpdk.org/project/dpdk/list/?series=20398", "date": "2021-11-08T16:41:01", "name": "doc: describe timestamp limitations for mlx5", "version": 1, "mbox": "https://patches.dpdk.org/series/20398/mbox/" } ], "comments": "https://patches.dpdk.org/api/patches/104008/comments/", "check": "fail", "checks": "https://patches.dpdk.org/api/patches/104008/checks/", "tags": {}, "related": [], "headers": { "Return-Path": "<dev-bounces@dpdk.org>", "X-Original-To": "patchwork@inbox.dpdk.org", "Delivered-To": "patchwork@inbox.dpdk.org", "Received": [ "from mails.dpdk.org (mails.dpdk.org [217.70.189.124])\n\tby inbox.dpdk.org (Postfix) with ESMTP id CAEACA0C4E;\n\tMon, 8 Nov 2021 17:41:35 +0100 (CET)", "from [217.70.189.124] (localhost [127.0.0.1])\n\tby mails.dpdk.org (Postfix) with ESMTP id 65B5F410FD;\n\tMon, 8 Nov 2021 17:41:35 +0100 (CET)", "from NAM11-BN8-obe.outbound.protection.outlook.com\n (mail-bn8nam11on2056.outbound.protection.outlook.com [40.107.236.56])\n by mails.dpdk.org (Postfix) with ESMTP id 630D340E28;\n Mon, 8 Nov 2021 17:41:34 +0100 (CET)", "from BN9PR03CA0698.namprd03.prod.outlook.com (2603:10b6:408:ef::13)\n by SN1PR12MB2480.namprd12.prod.outlook.com (2603:10b6:802:22::21)\n with Microsoft SMTP Server (version=TLS1_2,\n cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.4669.11; 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dpdk.org; dkim=none (message not signed)\n header.d=none;dpdk.org; dmarc=pass action=none header.from=nvidia.com;", "Received-SPF": "Pass (protection.outlook.com: domain of nvidia.com designates\n 216.228.112.34 as permitted sender) receiver=protection.outlook.com;\n client-ip=216.228.112.34; helo=mail.nvidia.com;", "From": "Viacheslav Ovsiienko <viacheslavo@nvidia.com>", "To": "<dev@dpdk.org>", "CC": "<rasland@nvidia.com>, <matan@nvidia.com>, <stable@dpdk.org>", "Date": "Mon, 8 Nov 2021 18:41:01 +0200", "Message-ID": "<20211108164101.26308-1-viacheslavo@nvidia.com>", "X-Mailer": "git-send-email 2.18.1", "MIME-Version": "1.0", "Content-Type": "text/plain", "X-Originating-IP": "[172.20.187.6]", "X-ClientProxiedBy": "HQMAIL101.nvidia.com (172.20.187.10) To\n HQMAIL107.nvidia.com (172.20.187.13)", "X-EOPAttributedMessage": "0", "X-MS-PublicTrafficType": "Email", "X-MS-Office365-Filtering-Correlation-Id": "2af69dd1-f208-4ac2-0071-08d9a2d69e8b", "X-MS-TrafficTypeDiagnostic": "SN1PR12MB2480:", "X-Microsoft-Antispam-PRVS": "\n <SN1PR12MB248086958AD526D98DA62FA4DF919@SN1PR12MB2480.namprd12.prod.outlook.com>", "X-MS-Oob-TLC-OOBClassifiers": "OLM:8273;", "X-MS-Exchange-SenderADCheck": "1", "X-MS-Exchange-AntiSpam-Relay": "0", "X-Microsoft-Antispam": "BCL:0;", "X-Microsoft-Antispam-Message-Info": "\n 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", "X-Forefront-Antispam-Report": "CIP:216.228.112.34; CTRY:US; LANG:en; SCL:1;\n SRV:;\n IPV:NLI; SFV:NSPM; H:mail.nvidia.com; PTR:schybrid03.nvidia.com; CAT:NONE;\n SFS:(4636009)(46966006)(36840700001)(6666004)(356005)(47076005)(83380400001)(1076003)(2616005)(70586007)(426003)(70206006)(7636003)(336012)(6286002)(8936002)(36906005)(5660300002)(82310400003)(36860700001)(55016002)(450100002)(2906002)(7696005)(6916009)(54906003)(16526019)(186003)(4326008)(86362001)(36756003)(316002)(508600001)(26005)(8676002);\n DIR:OUT; SFP:1101;", "X-OriginatorOrg": "Nvidia.com", "X-MS-Exchange-CrossTenant-OriginalArrivalTime": "08 Nov 2021 16:41:31.4627 (UTC)", "X-MS-Exchange-CrossTenant-Network-Message-Id": "\n 2af69dd1-f208-4ac2-0071-08d9a2d69e8b", "X-MS-Exchange-CrossTenant-Id": "43083d15-7273-40c1-b7db-39efd9ccc17a", "X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp": "\n TenantId=43083d15-7273-40c1-b7db-39efd9ccc17a; Ip=[216.228.112.34];\n Helo=[mail.nvidia.com]", "X-MS-Exchange-CrossTenant-AuthSource": "\n BN8NAM11FT023.eop-nam11.prod.protection.outlook.com", "X-MS-Exchange-CrossTenant-AuthAs": "Anonymous", "X-MS-Exchange-CrossTenant-FromEntityHeader": "HybridOnPrem", "X-MS-Exchange-Transport-CrossTenantHeadersStamped": "SN1PR12MB2480", "Subject": "[dpdk-dev] [PATCH] doc: describe timestamp limitations for mlx5", "X-BeenThere": "dev@dpdk.org", "X-Mailman-Version": "2.1.29", "Precedence": "list", "List-Id": "DPDK patches and discussions <dev.dpdk.org>", "List-Unsubscribe": "<https://mails.dpdk.org/options/dev>,\n <mailto:dev-request@dpdk.org?subject=unsubscribe>", "List-Archive": "<http://mails.dpdk.org/archives/dev/>", "List-Post": "<mailto:dev@dpdk.org>", "List-Help": "<mailto:dev-request@dpdk.org?subject=help>", "List-Subscribe": "<https://mails.dpdk.org/listinfo/dev>,\n <mailto:dev-request@dpdk.org?subject=subscribe>", "Errors-To": "dev-bounces@dpdk.org", "Sender": "\"dev\" <dev-bounces@dpdk.org>" }, "content": "The ConnectX NIC series hardware provides only 63-bit\nwide timestamps. The imposed limitations description\nadded to documentation.\n\nAt the moment there are no affected applications known\nor bug reports neither, this is just the declaration\nof limitation.\n\nCc: stable@dpdk.org\n\nSigned-off-by: Viacheslav Ovsiienko <viacheslavo@nvidia.com>\n---\n doc/guides/nics/mlx5.rst | 17 +++++++++++++++++\n 1 file changed, 17 insertions(+)", "diff": "diff --git a/doc/guides/nics/mlx5.rst b/doc/guides/nics/mlx5.rst\nindex d175c2061e..043d006a2b 100644\n--- a/doc/guides/nics/mlx5.rst\n+++ b/doc/guides/nics/mlx5.rst\n@@ -480,6 +480,19 @@ Limitations\n \n - Needs OFED 5.4+.\n \n+- Timestamps:\n+\n+ - CQE timestamp field width is limited by hardware to 63 bits, msb is zero\n+ - in the free-running mode the timestamp coounter is reset on power on\n+ and 63-bit value provides over 1800 years of uptime till overflow\n+ - in the real-time mode (configurable with REAL_TIME_CLOCK_ENABLE firmware\n+ settings), the timestamp presents the nanoseconds elapsed since 01-Jan-1970,\n+ hardware timestamp overflow will happen on 19-Jan-2038\n+ (0x80000000 seconds since 01-Jan-1970)\n+ - the send scheduling is based on timestamps from the reference \"Clock Queue\"\n+ completions, the scheduled send timestamps should not be specified\n+ with non-zero msb\n+\n Statistics\n ----------\n \n@@ -1242,6 +1255,10 @@ Below are some firmware configurations listed.\n FLEX_PARSER_PROFILE_ENABLE=4\n PROG_PARSE_GRAPH=1\n \n+- enable realtime timestamp format::\n+\n+ REAL_TIME_CLOCK_ENABLE=1\n+\n Linux Prerequisites\n -------------------\n \n", "prefixes": [] }