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[ { "id": 116487, "web_url": "https://patches.dpdk.org/comment/116487/", "msgid": "<AM0PR05MB6707F17FFB6B42A5B78EB735C2790@AM0PR05MB6707.eurprd05.prod.outlook.com>", "list_archive_url": "https://inbox.dpdk.org/dev/AM0PR05MB6707F17FFB6B42A5B78EB735C2790@AM0PR05MB6707.eurprd05.prod.outlook.com", "date": "2020-07-22T09:17:19", "subject": "Re: [dpdk-dev] [PATCH v2] common/mlx5: fix Rx/Tx queue doorbell\n\trecord size", "submitter": { "id": 513, "url": "https://patches.dpdk.org/api/people/513/?format=api", "name": "Raslan Darawsheh", "email": "rasland@mellanox.com" }, "content": "Hi,\n> -----Original Message-----\n> From: Viacheslav Ovsiienko <viacheslavo@mellanox.com>\n> Sent: Tuesday, July 21, 2020 2:11 PM\n> To: dev@dpdk.org\n> Cc: Matan Azrad <matan@mellanox.com>; Raslan Darawsheh\n> <rasland@mellanox.com>; Thomas Monjalon <thomas@monjalon.net>;\n> Dekel Peled <dekelp@mellanox.com>; stable@dpdk.org\n> Subject: [PATCH v2] common/mlx5: fix Rx/Tx queue doorbell record size\n> \n> When Rx/Tx queue was being created with DevX the allocated\n> doorbell record size was only uint64_t. That was definitely\n> less than size of CPU cacheline and it might have happened the\n> doorbell records attached to different queues handled by\n> different cores were allocated within same cacheline. It might\n> have caused the contention on doorbell record writing.\n> \n> This patch extends the allocated memory size for doorbell\n> record to cacheline size.\n> \n> Fixes: 21cae8580fd0 (\"net/mlx5: allocate door-bells via DevX\")\n> Cc: stable@dpdk.org\n> \n> Signed-off-by: Viacheslav Ovsiienko <viacheslavo@mellanox.com>\n> Acked-by: Matan Azrad <matan@mellanox.com>\n> \n> ---\n> v2: - rebase\n> - clarify commit message, register is replaced with record\n> \n> drivers/common/mlx5/mlx5_common.c | 2 +-\n> drivers/common/mlx5/mlx5_common.h | 10 ++++++----\n> 2 files changed, 7 insertions(+), 5 deletions(-)\n> \n> diff --git a/drivers/common/mlx5/mlx5_common.c\n> b/drivers/common/mlx5/mlx5_common.c\n> index 79cd5ba..193e73b 100644\n> --- a/drivers/common/mlx5/mlx5_common.c\n> +++ b/drivers/common/mlx5/mlx5_common.c\n> @@ -187,7 +187,7 @@ static inline void mlx5_cpu_id(unsigned int level,\n> \tpage->dbr_bitmap[i] |= (UINT64_C(1) << j);\n> \tpage->dbr_count++;\n> \t*dbr_page = page;\n> -\treturn (((i * 64) + j) * sizeof(uint64_t));\n> +\treturn (i * CHAR_BIT * sizeof(uint64_t) + j) * MLX5_DBR_SIZE;\n> }\n> \n> /**\n> diff --git a/drivers/common/mlx5/mlx5_common.h\n> b/drivers/common/mlx5/mlx5_common.h\n> index 5b9b7bd..ef7b61b 100644\n> --- a/drivers/common/mlx5/mlx5_common.h\n> +++ b/drivers/common/mlx5/mlx5_common.h\n> @@ -214,10 +214,12 @@ enum mlx5_class {\n> \tMLX5_CLASS_VDPA = RTE_BIT64(1),\n> };\n> \n> -#define MLX5_DBR_PAGE_SIZE 4096 /* Must be >= 512. */\n> -#define MLX5_DBR_SIZE 8\n> -#define MLX5_DBR_PER_PAGE (MLX5_DBR_PAGE_SIZE / MLX5_DBR_SIZE)\n> -#define MLX5_DBR_BITMAP_SIZE (MLX5_DBR_PER_PAGE / 64)\n> +#define MLX5_DBR_SIZE RTE_CACHE_LINE_SIZE\n> +#define MLX5_DBR_PER_PAGE 64\n> +/* Must be >= CHAR_BIT * sizeof(uint64_t) */\n> +#define MLX5_DBR_PAGE_SIZE (MLX5_DBR_PER_PAGE * MLX5_DBR_SIZE)\n> +/* Page size must be >= 512. */\n> +#define MLX5_DBR_BITMAP_SIZE (MLX5_DBR_PER_PAGE / (CHAR_BIT *\n> sizeof(uint64_t)))\n> \n> struct mlx5_devx_dbr_page {\n> \t/* Door-bell records, must be first member in structure. */\n> --\n> 1.8.3.1\n\nPatch applied to next-net-mlx,\n\nKindest regards,\nRaslan Darawsheh", "headers": { "Return-Path": "<dev-bounces@dpdk.org>", "X-Original-To": "patchwork@inbox.dpdk.org", "Delivered-To": "patchwork@inbox.dpdk.org", "Received": [ "from dpdk.org (dpdk.org [92.243.14.124])\n\tby inbox.dpdk.org (Postfix) with ESMTP id 5CC99A0526;\n\tWed, 22 Jul 2020 11:17:23 +0200 (CEST)", "from [92.243.14.124] (localhost [127.0.0.1])\n\tby dpdk.org (Postfix) with ESMTP id 0F06A1BFBB;\n\tWed, 22 Jul 2020 11:17:22 +0200 (CEST)", "from EUR03-AM5-obe.outbound.protection.outlook.com\n (mail-eopbgr30085.outbound.protection.outlook.com [40.107.3.85])\n by dpdk.org (Postfix) with ESMTP id BC0541BE90;\n Wed, 22 Jul 2020 11:17:20 +0200 (CEST)", "from AM0PR05MB6707.eurprd05.prod.outlook.com (2603:10a6:20b:15b::17)\n by AM0PR05MB6468.eurprd05.prod.outlook.com (2603:10a6:208:139::10)\n with Microsoft SMTP Server (version=TLS1_2,\n cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.3195.23; Wed, 22 Jul\n 2020 09:17:19 +0000", "from AM0PR05MB6707.eurprd05.prod.outlook.com\n ([fe80::ecd3:6008:3784:4012]) by AM0PR05MB6707.eurprd05.prod.outlook.com\n ([fe80::ecd3:6008:3784:4012%5]) with mapi id 15.20.3195.028; Wed, 22 Jul 2020\n 09:17:19 +0000" ], "ARC-Seal": "i=1; a=rsa-sha256; s=arcselector9901; d=microsoft.com; cv=none;\n b=ijTQXcbzgr1+csy+S4rZcVBBxGK/skId0A3AHdl403jrUdN8M4RyWOqxK+VHDHHEoDV17dBr1C2PfFO1JhLKF16pRVBKGdiLmu8LaIMQMmeB3WP6S6fUgte3cPqBoZVfYfm/yizUG9R/PCDVvb9S6wzawFuf9O81WlOBqMbjVf9TuedhPlmlOkm8ixhWXXIMeXC4H7ffEIQBWZ61ACoTJr1ejhlcKc+mkkS3+yoLHswu6jx9SVOwULGPxaGfnJKxZ95vUAcfmdK5Fk1ABQN6qtA42S/MCIwnccs8Fd8fUT8oKXFfYCe00pezYxbosZ2ytwp7X5k+8+4P+g5lfPDTJA==", "ARC-Message-Signature": "i=1; a=rsa-sha256; c=relaxed/relaxed; d=microsoft.com;\n s=arcselector9901;\n h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck;\n bh=WJYChS4gx4BGfX2xNrZcaUhCwf8e8zopAMqleH4j1Js=;\n b=IxsVL53TlQQt3/itpZfvbdDFrfLA1Ua6rDzzq3OccD5hIOFup1ePGvlohyNAHoG5QHzNEnJQCrxz0Fhil2C1dKAN0DzgV1qr/i0QELwDmeCbdfwEC0HyCmT8vHzoQpVr/nyNTIIOz7rj1+BEdl+Vx6Nv7H4CSiZnpr82KIoDzSKDOuMdKUEj4Z8nnISHAFKrMHRtBaXl3bXJX5dm0usoYRK3+Lx4X6MSuAfvWPTLDJ9zKn1melmgsEcyuUrFKl6JndZ8gi2mAmWAX9re1AxeFCIv8YqSQ9VgfvqSR0CCcASyp9KbY+dKl4EzwW5IHLSOYnDVP3s7oiuBLRftrfY85g==", "ARC-Authentication-Results": "i=1; mx.microsoft.com 1; spf=pass\n smtp.mailfrom=mellanox.com; dmarc=pass action=none header.from=mellanox.com;\n dkim=pass header.d=mellanox.com; arc=none", "DKIM-Signature": "v=1; a=rsa-sha256; c=relaxed/relaxed; d=Mellanox.com;\n s=selector1;\n h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck;\n bh=WJYChS4gx4BGfX2xNrZcaUhCwf8e8zopAMqleH4j1Js=;\n b=smiwTOaWx4D4sfhLad5f1IXpLHr/mQ566a0L4d20FLgESDVHvfIASmiIF6h0AVszDcDJief+augPsa0o7Ur/7jU53Gqnhoi1SgsWK/0p20+T+7EzaQlYrRu+l6tT8kbTTepGzoZRaGjUkOvgEx4tgZ7vrvNtsnJoaEYfGb+4Cbo=", "From": "Raslan Darawsheh <rasland@mellanox.com>", "To": "Slava Ovsiienko <viacheslavo@mellanox.com>, \"dev@dpdk.org\" <dev@dpdk.org>", "CC": "Matan Azrad <matan@mellanox.com>, Thomas Monjalon <thomas@monjalon.net>,\n Dekel Peled <dekelp@mellanox.com>, \"stable@dpdk.org\" <stable@dpdk.org>", "Thread-Topic": "[PATCH v2] common/mlx5: fix Rx/Tx queue doorbell record size", "Thread-Index": "AQHWX0+zmF9OvwKUpEulZor6H6buDakTUa2w", "Date": "Wed, 22 Jul 2020 09:17:19 +0000", "Message-ID": "\n <AM0PR05MB6707F17FFB6B42A5B78EB735C2790@AM0PR05MB6707.eurprd05.prod.outlook.com>", "References": "<1595165997-12225-1-git-send-email-viacheslavo@mellanox.com>\n <1595329889-31516-1-git-send-email-viacheslavo@mellanox.com>", "In-Reply-To": "<1595329889-31516-1-git-send-email-viacheslavo@mellanox.com>", "Accept-Language": "en-US", "Content-Language": "en-US", "X-MS-Has-Attach": "", "X-MS-TNEF-Correlator": "", "authentication-results": "mellanox.com; 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