From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mails.dpdk.org (mails.dpdk.org [217.70.189.124]) by inbox.dpdk.org (Postfix) with ESMTP id 8ACBFA034D for ; Thu, 10 Feb 2022 09:16:42 +0100 (CET) Received: from [217.70.189.124] (localhost [127.0.0.1]) by mails.dpdk.org (Postfix) with ESMTP id 7697241172; Thu, 10 Feb 2022 09:16:42 +0100 (CET) Received: from NAM04-BN8-obe.outbound.protection.outlook.com (mail-bn8nam08on2061.outbound.protection.outlook.com [40.107.100.61]) by mails.dpdk.org (Postfix) with ESMTP id 2BCA240041; Thu, 10 Feb 2022 09:16:40 +0100 (CET) ARC-Seal: i=1; a=rsa-sha256; s=arcselector9901; d=microsoft.com; cv=none; b=chAutXp+8nHOMeyZRhbx9By/PAg2K+2AdRRDqmLtV6PCLyyN/c/NuHrjtTP/apObKezVVhKX81yVACpYt6s7t+Qa+aWbJQcdBQM5tiSI5AzbUOKlWmrfLT48Ofr6NPeDKmqcgl+QBH5smDBDZOiiHuFm98gTLc/ipE/oC1LVAGdJHPmrMgMtvONc8e6lsxEjulfoOb615MaaOtUKopCRcG1kI/iaG0xRg9XGjOqYhLe5NBUVnZ25kHAEadIZwOq8G8989wiTGMdOa6OALgn/lwNK013fHb81eHFLoVf3VfAx4w/Hw0TC7JjAe0+kSBGxc/e1XBa0X2O16rtgW5vynw== 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=O2UahS+WisUhAm7JpAo2ir0ZcE/37FXAg9Sd7QLYZMQ=; b=mqSOEI4mAFcB53c5mBVqdXZbO+js4BJnsX+EuZa73keK8PZ1m1OcQxy7rZBMkgk0Vq2L9GjzlEFk+sF+fcFAtVWUyIYaPxuH8UCXZyB+op1i2QJkMTOS/DIAjLg0ENy4obMDYJwmD2JZZOcZQBGKh1Wp0r5CfFfoegp6thrq/h+wsyGJGHnfTjeePg9792Sm2NqPxvo2z2XikRa1wyMna+XsJgwrglHikzoE3S8kahYE9MKueSjXn65Cmvcqu8Az0t62hY9EDXlcGsbwBroxGM2muZq+y2G3NZZ+NAVZYYmNt8GqVgaW2ASoJR57ukHe3vNzT3P60OzBeVV+8SOeSw== ARC-Authentication-Results: i=1; mx.microsoft.com 1; spf=none; dmarc=none; dkim=none; 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=O2UahS+WisUhAm7JpAo2ir0ZcE/37FXAg9Sd7QLYZMQ=; b=Exv0Wz20d2tVCjWrONyn7yx1kYOoeSf52Qg00FvAEW3m3Uo1lqtl8numpXtA+tPZf34wsi/CwkF8UdJTB6lzQDcejtYgskqm6LaHtvqVPHqpzcORP2OsqpDZbKYvnQLiFO9hOJVC8KzVvGKBNk2vJJACmNBXZ3B2ZS7VnlVt9CTYS/kccQSYTezuwAvsPNH3u8gM9IbvxuV50JWPt+yvIbVSoodex4FTc2sTGJ9iB0oYqOUm80x7Ulyz2MOVq3o/LoBoyKR4UbnGp1yJEDfMTJ57GUyw6jYPris5j5BxzX5a+8C3yLc+7K9xdaOSE098QhrzXPbUYHLVi+kCBfrgHQ== Received: from DM6PR12MB3753.namprd12.prod.outlook.com (2603:10b6:5:1c7::18) by DM5PR1201MB0075.namprd12.prod.outlook.com (2603:10b6:4:54::17) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.4975.11; Thu, 10 Feb 2022 08:16:38 +0000 Received: from DM6PR12MB3753.namprd12.prod.outlook.com ([fe80::f032:e2f5:9e29:2775]) by DM6PR12MB3753.namprd12.prod.outlook.com ([fe80::f032:e2f5:9e29:2775%4]) with mapi id 15.20.4975.011; Thu, 10 Feb 2022 08:16:38 +0000 From: Slava Ovsiienko To: Ruifeng Wang , Matan Azrad CC: "dev@dpdk.org" , Honnappa Nagarahalli , "stable@dpdk.org" , nd , nd Subject: RE: [PATCH] net/mlx5: fix risk in Rx descriptor read in NEON vector path Thread-Topic: [PATCH] net/mlx5: fix risk in Rx descriptor read in NEON vector path Thread-Index: AQHYARdfa+I7kzN/pEut6P8zdK0chayMi6EAgAAesiA= Date: Thu, 10 Feb 2022 08:16:38 +0000 Message-ID: References: <20220104030056.268974-1-ruifeng.wang@arm.com> In-Reply-To: Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: authentication-results: dkim=none (message not signed) header.d=none;dmarc=none action=none header.from=nvidia.com; x-ms-publictraffictype: Email x-ms-office365-filtering-correlation-id: 5cfdbcf2-33d8-4b07-d1c9-08d9ec6da957 x-ms-traffictypediagnostic: DM5PR1201MB0075:EE_ x-microsoft-antispam-prvs: x-ms-oob-tlc-oobclassifiers: OLM:6790; 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:DM6PR12MB3753.namprd12.prod.outlook.com; PTR:; CAT:NONE; SFS:(13230001)(4636009)(366004)(76116006)(316002)(55016003)(2906002)(83380400001)(53546011)(71200400001)(110136005)(66446008)(6636002)(6506007)(7696005)(66476007)(66556008)(9686003)(4326008)(8676002)(54906003)(64756008)(26005)(52536014)(33656002)(38070700005)(186003)(66946007)(8936002)(508600001)(5660300002)(86362001)(38100700002)(122000001); DIR:OUT; SFP:1101; x-ms-exchange-antispam-messagedata-chunkcount: 1 x-ms-exchange-antispam-messagedata-0: =?us-ascii?Q?doE8BoM3kBpIL+glt2UD5uKkPQW6pQ0BIS2RLf2hILDtlQt1LYbHw0C3ROny?= =?us-ascii?Q?R94eQyQHfVHYTVfMaZj7G9WOcVJJynWq/3Mdy5bf7i+Hn5U6wHoM/hAPkAUt?= =?us-ascii?Q?kZiScU/3kHQOEARcCPqs5uH2TkvCkYi+zHwHau6XSfCtiYu9E/UM9iyfySEf?= =?us-ascii?Q?fJSGwQ4OVuqTSrwxz23t06lfxC9l4ykAm6B1PbXMMfGlpDfykbrTj8WDvWwc?= =?us-ascii?Q?+b4u0+yJAzfvqJYisUaGhXGZaKBRRZ6NN3vDsRA59wi++rJSOCA7eL9RO5z3?= =?us-ascii?Q?BMPOcnl27x4n8mNS6IHkXQ3s2dKvnGdmZrWQS/BUGLlIEWRqW885EokwwUmz?= =?us-ascii?Q?qDpupZfoCGZqOX4BW9ScLpMeWT0n5tHGO0EXX4XEYPDrRZj0HsfXb6iR7c8x?= =?us-ascii?Q?7iAyov8WZECbQBxJkvJFGOkK1cR7/lB4hEJnkNyCYoOaDoeJ/NPorUGkX9nq?= =?us-ascii?Q?l1VNpLrrNW5Aphonb8uql1B/b92KnmzoEWizR+GMkkK3ke5KdTiOXoT4Nhfx?= =?us-ascii?Q?YwB6DWs7++sAQjTMwvC0vdvBik2d5/ak1K3h/Qx7VG2ZI0EtgQ4eY07CL1ue?= =?us-ascii?Q?pinEvvnRJcvkVEdMXoKocCSKDxRLOHqj8EjngCbG1nNLQQGii+NNOu/zgv/z?= =?us-ascii?Q?emfvaBLwNtKIp37WIj6Hv5T0HxHyuglzhK8cw+rUzIearhf8vY1YoPhDQDXu?= =?us-ascii?Q?mez1nNPD+f3EPOjpxmhpqE3Db4XfFxuzEd9NccclbqQvmxmMr3NtzTkX2aaY?= =?us-ascii?Q?lsfPvs1Nl6U0VuqT+ST6exCBR5ESdUZY/DSqPX1BYF+GdkAkUAVvDyGplCFJ?= =?us-ascii?Q?WGPPuzCRrqFTAOx28l7ZKQY1pfA8Wi6C0kH+gg7JtoRLZbKaxLetv/vpxgyx?= =?us-ascii?Q?FyeUCH3vERbcXrENLmDJ7xjowzLe2F7tf6YLtJ2bTyf4q9By4PG7MG0ouneQ?= =?us-ascii?Q?bz5AgkA5ieDQC3hhMuKYHORNVcarbd7I74P9bY0QJtWny6EVeE1J3JTULYaj?= =?us-ascii?Q?nCglpMB7hIeRNsqH4KOpwaM9grW/Wm65XYNe7P03niYufu3LIVKwGNO9MVOu?= =?us-ascii?Q?iHn8ppWyZ4qP9hvIuZZQdfsgdDvP53Byu7e6/HXpjDHD/1E1DT4ZCfzXDeLU?= =?us-ascii?Q?bN8icNNRfmaVCNMClHsD+DNmh3G4I/uy9oHv20nvFZMjcb+uNKpjQZQpqQ81?= =?us-ascii?Q?kVuSVGYAPGLpFjsG78O8AuPlgfSLoPn8IP2apx3C6dNXe4scvq2jx88tkXVr?= =?us-ascii?Q?mjtVf8KaOn0maaqhk0rNe6jtOZ/zWh9F42pgw0IaDyCs2riULjNvRKwHl0EW?= =?us-ascii?Q?YzXFt3WhPYNOfRagShXqc6fCi0tbpN/JOsxPlSmz2DehCP1aHyitg69JUKB/?= =?us-ascii?Q?tK1BerjHgZsx885rq16kWE+6rYyp94vAwiXTtXD1+LBSRcTQwtQdoE4pPD/T?= =?us-ascii?Q?icq7ZEJf/pm8rtwrymvkgq3ReTR5aS4C0RypzxIRl7omeVMrwezD/myk+NXr?= =?us-ascii?Q?1xF0Ri1b/vuSfnnd9iCpMhsuduW54Ebr20gESbPvpB4MahuRSpbYCu0vm9yD?= =?us-ascii?Q?zXvGNyaaYPP5AcxbSq0z6XnaOlZuvnxyYEBVwjR2Es384QVS8KPtXjSwquXq?= =?us-ascii?Q?sg=3D=3D?= Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-AuthSource: DM6PR12MB3753.namprd12.prod.outlook.com X-MS-Exchange-CrossTenant-Network-Message-Id: 5cfdbcf2-33d8-4b07-d1c9-08d9ec6da957 X-MS-Exchange-CrossTenant-originalarrivaltime: 10 Feb 2022 08:16:38.5393 (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: rQA4HWo6/nvXXqXaL7ZkrVldX71ncGUKYNeHVMsfwfu/Nbui5f40diIAuuxDSxKuMnOnWbu/cQr/GBTW3EqabQ== X-MS-Exchange-Transport-CrossTenantHeadersStamped: DM5PR1201MB0075 X-BeenThere: stable@dpdk.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: patches for DPDK stable branches List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: stable-bounces@dpdk.org Hi Ruifeng, Patch looks reasonable, thank you. Just curious - did you see the real issue with re-ordering in this code fra= gment? And, please, let us do performance check. With best regards, Slava > -----Original Message----- > From: Ruifeng Wang > Sent: Thursday, February 10, 2022 8:25 > To: Matan Azrad ; Slava Ovsiienko > > Cc: dev@dpdk.org; Honnappa Nagarahalli > ; stable@dpdk.org; nd ; > Ruifeng Wang ; nd > Subject: RE: [PATCH] net/mlx5: fix risk in Rx descriptor read in NEON vec= tor > path >=20 > Ping. > Please could you help to review this patch? >=20 > Thanks. > Ruifeng >=20 > > -----Original Message----- > > From: Ruifeng Wang > > Sent: Tuesday, January 4, 2022 11:01 AM > > To: matan@nvidia.com; viacheslavo@nvidia.com > > Cc: dev@dpdk.org; Honnappa Nagarahalli > ; > > stable@dpdk.org; nd ; Ruifeng Wang > > > Subject: [PATCH] net/mlx5: fix risk in Rx descriptor read in NEON > > vector path > > > > In NEON vector PMD, vector load loads two contiguous 8B of descriptor > > data into vector register. Given vector load ensures no 16B atomicity, > > read of the word that includes op_own field could be reordered after > > read of other words. In this case, some words could contain invalid dat= a. > > > > Reloaded qword0 after read barrier to update vector register. This > > ensures that the fetched data is correct. > > > > Testpmd single core test on N1SDP/ThunderX2 showed no performance > > drop. > > > > Fixes: 1742c2d9fab0 ("net/mlx5: fix synchronization on polling Rx > > completions") > > Cc: stable@dpdk.org > > > > Signed-off-by: Ruifeng Wang > > --- > > drivers/net/mlx5/mlx5_rxtx_vec_neon.h | 8 ++++++++ > > 1 file changed, 8 insertions(+) > > > > diff --git a/drivers/net/mlx5/mlx5_rxtx_vec_neon.h > > b/drivers/net/mlx5/mlx5_rxtx_vec_neon.h > > index b1d16baa61..b1ec615b51 100644 > > --- a/drivers/net/mlx5/mlx5_rxtx_vec_neon.h > > +++ b/drivers/net/mlx5/mlx5_rxtx_vec_neon.h > > @@ -647,6 +647,14 @@ rxq_cq_process_v(struct mlx5_rxq_data *rxq, > > volatile struct mlx5_cqe *cq, > > c0 =3D vld1q_u64((uint64_t *)(p0 + 48)); > > /* Synchronize for loading the rest of blocks. */ > > rte_io_rmb(); > > + /* B.0 (CQE 3) reload lower half of the block. */ > > + c3 =3D vld1q_lane_u64((uint64_t *)(p3 + 48), c3, 0); > > + /* B.0 (CQE 2) reload lower half of the block. */ > > + c2 =3D vld1q_lane_u64((uint64_t *)(p2 + 48), c2, 0); > > + /* B.0 (CQE 1) reload lower half of the block. */ > > + c1 =3D vld1q_lane_u64((uint64_t *)(p1 + 48), c1, 0); > > + /* B.0 (CQE 0) reload lower half of the block. */ > > + c0 =3D vld1q_lane_u64((uint64_t *)(p0 + 48), c0, 0); > > /* Prefetch next 4 CQEs. */ > > if (pkts_n - pos >=3D 2 * MLX5_VPMD_DESCS_PER_LOOP) { > > unsigned int next =3D pos + > > MLX5_VPMD_DESCS_PER_LOOP; > > -- > > 2.25.1