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 X-Spam-Level: X-Spam-Status: No, score=-6.8 required=3.0 tests=DKIM_INVALID,DKIM_SIGNED, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,UNPARSEABLE_RELAY autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 48108C433DF for ; Mon, 29 Jun 2020 04:40:47 +0000 (UTC) Received: from dpdk.org (dpdk.org [92.243.14.124]) by mail.kernel.org (Postfix) with ESMTP id B368120774 for ; Mon, 29 Jun 2020 04:40:46 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (1024-bit key) header.d=armh.onmicrosoft.com header.i=@armh.onmicrosoft.com header.b="5B1UotY+"; dkim=fail reason="signature verification failed" (1024-bit key) header.d=armh.onmicrosoft.com header.i=@armh.onmicrosoft.com header.b="5B1UotY+" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org B368120774 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=arm.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=dev-bounces@dpdk.org Received: from [92.243.14.124] (localhost [127.0.0.1]) by dpdk.org (Postfix) with ESMTP id EA6B11B13C; Mon, 29 Jun 2020 06:40:45 +0200 (CEST) Received: from EUR01-VE1-obe.outbound.protection.outlook.com (mail-eopbgr140054.outbound.protection.outlook.com [40.107.14.54]) by dpdk.org (Postfix) with ESMTP id A55D21150 for ; Mon, 29 Jun 2020 06:40:44 +0200 (CEST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=armh.onmicrosoft.com; s=selector2-armh-onmicrosoft-com; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck; bh=M7XRDWN6EHnuHQ8gL1bBZTGz/TDThTNcxoNYgsKOA2Y=; b=5B1UotY+cUCLo/1NK5Movr4HF+NEXbZHIzzy20en0+j8FbgHn89L6IysULQtpwNLl/wiWkqgvaOrGv51/70GKL0M3HNoGNga4aUNttsebiqgkzYp2gDH+55xutw1mmyQyadGTfSPVHZ6pU5jTwpjR2jKbmv5xuZ+SFjWIuU7DGk= Received: from DB7PR03CA0090.eurprd03.prod.outlook.com (2603:10a6:10:72::31) by DB6PR0802MB2199.eurprd08.prod.outlook.com (2603:10a6:4:82::13) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.3131.25; Mon, 29 Jun 2020 04:40:43 +0000 Received: from DB5EUR03FT049.eop-EUR03.prod.protection.outlook.com (2603:10a6:10:72:cafe::97) by DB7PR03CA0090.outlook.office365.com (2603:10a6:10:72::31) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.3131.24 via Frontend Transport; Mon, 29 Jun 2020 04:40:43 +0000 X-MS-Exchange-Authentication-Results: spf=pass (sender IP is 63.35.35.123) smtp.mailfrom=arm.com; dpdk.org; dkim=pass (signature was verified) header.d=armh.onmicrosoft.com;dpdk.org; dmarc=bestguesspass action=none header.from=arm.com; Received-SPF: Pass (protection.outlook.com: domain of arm.com designates 63.35.35.123 as permitted sender) receiver=protection.outlook.com; client-ip=63.35.35.123; helo=64aa7808-outbound-1.mta.getcheckrecipient.com; Received: from 64aa7808-outbound-1.mta.getcheckrecipient.com (63.35.35.123) by DB5EUR03FT049.mail.protection.outlook.com (10.152.20.191) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.3131.20 via Frontend Transport; Mon, 29 Jun 2020 04:40:42 +0000 Received: ("Tessian outbound cea5956745d7:v60"); Mon, 29 Jun 2020 04:40:42 +0000 X-CR-MTA-TID: 64aa7808 Received: from 02a31e26fa5e.1 by 64aa7808-outbound-1.mta.getcheckrecipient.com id F58BDFCC-228D-45EC-9CBA-0845E598F75B.1; Mon, 29 Jun 2020 04:40:37 +0000 Received: from EUR03-DB5-obe.outbound.protection.outlook.com by 64aa7808-outbound-1.mta.getcheckrecipient.com with ESMTPS id 02a31e26fa5e.1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384); Mon, 29 Jun 2020 04:40:37 +0000 ARC-Seal: i=1; a=rsa-sha256; s=arcselector9901; d=microsoft.com; cv=none; b=l+CFKd8sm7v/ek1zHDRMOy+/4ybxzMOE102IWcVBK+tVfjX75sEIFXf4roPqXz6nA66OPAblD914U+7GP+xt19mWaQBwDBvzAOgT13J4QjsNNf8sVqRS4hFKYDtGVDEhHaHNEljm3f1KXrMNn62IzKfjQrlsanXVkbnLke58iSncNh8bHE7b8TWM055F+/dI9CcXpobhjqi6h5Fp6pk/1voNMz8wis6JbaJ/DS5XDoCGdZHsC43cUGOFI6hf65ZXrfMaxqVOAHb8RR274ZZ5tSUFId2m9f73BW5B5QlIO60t2MhCqPxNm3fzuauKDc9pytZgtlj0nvrG9TVSzp0beQ== 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-SenderADCheck; bh=M7XRDWN6EHnuHQ8gL1bBZTGz/TDThTNcxoNYgsKOA2Y=; b=ZDMj1iFjp58R0bhYzWwhrfQQbcVqEQM10Smb1GWRtHt4d0JSwCrbuQPa6Up3OJxKimInT0EK086RuOu6vr2wInYBias3QbnKJIHkDWlFuCs1+8B15FreASpVbCG6ZstmppFY4XYBZqOTuLeKgHx1H/JBVwW2hx6plLNxkqfqwP5eAZ9B+r/MAPDtWtU7hu9SZm0YehCMlMi3Hv7//xqGQze/Qj5NTPoecOkWhpVgPVw7j7H6Z/4HooQOhdSsLRmQpyjCu0tmfx1jKZZsoL9+DITBsRHnlVcbVoW7XEhgD2oEuyiaGEzDy5srhrXazWNzVuPMUkuSEvijYCtANTLKyw== ARC-Authentication-Results: i=1; mx.microsoft.com 1; spf=pass smtp.mailfrom=arm.com; dmarc=pass action=none header.from=arm.com; dkim=pass header.d=arm.com; arc=none DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=armh.onmicrosoft.com; s=selector2-armh-onmicrosoft-com; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck; bh=M7XRDWN6EHnuHQ8gL1bBZTGz/TDThTNcxoNYgsKOA2Y=; b=5B1UotY+cUCLo/1NK5Movr4HF+NEXbZHIzzy20en0+j8FbgHn89L6IysULQtpwNLl/wiWkqgvaOrGv51/70GKL0M3HNoGNga4aUNttsebiqgkzYp2gDH+55xutw1mmyQyadGTfSPVHZ6pU5jTwpjR2jKbmv5xuZ+SFjWIuU7DGk= Received: from DB6PR0802MB2216.eurprd08.prod.outlook.com (2603:10a6:4:85::9) by DB8PR08MB5513.eurprd08.prod.outlook.com (2603:10a6:10:f8::14) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.3131.23; Mon, 29 Jun 2020 04:40:36 +0000 Received: from DB6PR0802MB2216.eurprd08.prod.outlook.com ([fe80::9d1d:207b:e89d:199d]) by DB6PR0802MB2216.eurprd08.prod.outlook.com ([fe80::9d1d:207b:e89d:199d%10]) with mapi id 15.20.3131.026; Mon, 29 Jun 2020 04:40:36 +0000 From: Honnappa Nagarahalli To: Phil Yang , "dev@dpdk.org" CC: "mattias.ronnblom@ericsson.com" , "mb@smartsharesystems.com" , "stephen@networkplumber.org" , "thomas@monjalon.net" , "bruce.richardson@intel.com" , "ferruh.yigit@intel.com" , "hemant.agrawal@nxp.com" , "jerinj@marvell.com" , "ktraynor@redhat.com" , "konstantin.ananyev@intel.com" , "maxime.coquelin@redhat.com" , "olivier.matz@6wind.com" , "harry.van.haaren@intel.com" , "erik.g.carrillo@intel.com" , "drc@linux.vnet.ibm.com" , "david.marchand@redhat.com" , "zhaoyan.chen@intel.com" , Ola Liljedahl , Ruifeng Wang , Phil Yang , nd , Honnappa Nagarahalli , nd Thread-Topic: [PATCH v5 4/4] eal/atomic: add wrapper for c11 atomic thread fence Thread-Index: AQHWMzxoM2zbSme4/km4FuceL3pW7ajtDKUw Date: Mon, 29 Jun 2020 04:40:36 +0000 Message-ID: References: <1589270586-4480-1-git-send-email-phil.yang@arm.com> <1590483667-10318-1-git-send-email-phil.yang@arm.com> <1590483667-10318-5-git-send-email-phil.yang@arm.com> In-Reply-To: <1590483667-10318-5-git-send-email-phil.yang@arm.com> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-ts-tracking-id: cc53c4a7-9780-4e3a-9e24-9b2b7050a7ac.0 x-checkrecipientchecked: true Authentication-Results-Original: arm.com; dkim=none (message not signed) header.d=none;arm.com; dmarc=none action=none header.from=arm.com; x-originating-ip: [70.112.90.121] x-ms-publictraffictype: Email X-MS-Office365-Filtering-HT: Tenant X-MS-Office365-Filtering-Correlation-Id: 01dfca8b-5cf8-4d7c-085c-08d81be6950d x-ms-traffictypediagnostic: DB8PR08MB5513:|DB6PR0802MB2199: x-ld-processed: f34e5979-57d9-4aaa-ad4d-b122a662184d,ExtAddr x-ms-exchange-transport-forked: True X-Microsoft-Antispam-PRVS: x-checkrecipientrouted: true nodisclaimer: true x-ms-oob-tlc-oobclassifiers: OLM:7219;OLM:7219; x-forefront-prvs: 044968D9E1 X-MS-Exchange-SenderADCheck: 1 X-Microsoft-Antispam-Untrusted: BCL:0; X-Microsoft-Antispam-Message-Info-Original: 7EVk3GqzwoXEFoPLtR0S0JpqUiPs+QjKDMMEgs4l6RN4nMJKWGrR1z9kvhUPiWyXQvxgk7maC9gnm+nz83bVM1XkJesKkUoAmnXkMKNf0ghg0Mkhqtl7DHkNCLU8c/OQavcaE6SRTZORCi7UhaBtewpBI3yhJbsglXZsQcBq9QyLD66fVxhw63AeUWryCyz185ifgX6Ca8pHeOT3oi/U7WVC0+aopoxFti81IEDUzY2pqmTAcffdlMm5TZkPSsQX422jJpsFfSr9Z8RYV8VQ9JUzWo0zp34HGpaMfMpNw3OjPHJCVkYO6UTwhQfyWRv2Az2pdG2Td2YUCaw3s+XMUw== X-Forefront-Antispam-Report-Untrusted: CIP:255.255.255.255; CTRY:; LANG:en; SCL:1; SRV:; IPV:NLI; SFV:NSPM; H:DB6PR0802MB2216.eurprd08.prod.outlook.com; PTR:; CAT:NONE; SFTY:; SFS:(4636009)(39850400004)(396003)(346002)(366004)(136003)(376002)(71200400001)(8936002)(86362001)(8676002)(26005)(186003)(83380400001)(2906002)(33656002)(7416002)(6506007)(7696005)(5660300002)(66556008)(9686003)(76116006)(66946007)(55016002)(478600001)(64756008)(66476007)(52536014)(66446008)(4326008)(316002)(54906003)(110136005); DIR:OUT; SFP:1101; x-ms-exchange-antispam-messagedata: ZaApm7hvx8GtRPfE19x2X1JXFRHfV18ey09oL/Y6g6R00GVAeiPXlb1+P8wV9hxEv48fw1qKbGzJFudB2L+5kBPSjDkLp64n+KghDbOimj7e0GO/byVk6dcrHsjADicEvsGv7CKMpUwshamrF7vpkvu4lXkSBmdxHc2/BKoSD9UGvVX0OZ4jeVI1Z8WSjuw69TIB72OboEXufksO7kEp5Stmv1B2WAM7ZN0AJ3WNQEQrV6FXGrYL1JRCVyuznyGwDZNP9KBH2eCrv1IAdDOB0+SXUiqPoqHgAIq/nBUGHgJ/uJb/3Ao+cPaJGJ0SexFoUqFT3Duajzq0NeBfrT3di08UGhEFIsaOVaD/mXUbnM3S41UnOHEekqe6IIzeoGjtW/Hhuj1eC8R7jN1djP6TFQ8XKev/D7X2Vs2di50cZ6gv8OAX3aPNBPX1CCuuQfpWlTc88Fun+de1LYIlyWWigxEedZOuxXqQICfToPa3GJY= Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-MS-Exchange-Transport-CrossTenantHeadersStamped: DB8PR08MB5513 Original-Authentication-Results: arm.com; dkim=none (message not signed) header.d=none;arm.com; dmarc=none action=none header.from=arm.com; X-EOPAttributedMessage: 0 X-MS-Exchange-Transport-CrossTenantHeadersStripped: DB5EUR03FT049.eop-EUR03.prod.protection.outlook.com X-Forefront-Antispam-Report: CIP:63.35.35.123; CTRY:IE; LANG:en; SCL:1; SRV:; IPV:CAL; SFV:NSPM; H:64aa7808-outbound-1.mta.getcheckrecipient.com; PTR:ec2-63-35-35-123.eu-west-1.compute.amazonaws.com; CAT:NONE; SFTY:; SFS:(4636009)(376002)(396003)(39850400004)(136003)(346002)(46966005)(82310400002)(26005)(186003)(6506007)(5660300002)(33656002)(8676002)(52536014)(8936002)(478600001)(336012)(83380400001)(316002)(86362001)(81166007)(70586007)(54906003)(110136005)(4326008)(82740400003)(55016002)(2906002)(47076004)(70206006)(9686003)(7696005)(356005); DIR:OUT; SFP:1101; X-MS-Office365-Filtering-Correlation-Id-Prvs: 08db135a-eaf4-4b13-315d-08d81be6914d X-Forefront-PRVS: 044968D9E1 X-Microsoft-Antispam: BCL:0; X-Microsoft-Antispam-Message-Info: qq5yR+AnCeSy1R4is8FkWyVY5rtxIqmHdGLPXTYnlYyjihZIVWFP7f4PObUQoX7EFXxg7IYajG8P6zerXcG0keMvPGpi0VnJ1kiO6hE9AzG84fECNPfBdc51LGPALo/lwcymuirwqgmokBeGA69w+NqSN3p3WmXE3PYLujAfSptWUDPXHtDLim2KcFN5KQAhttNXv2HLaAW97ZVrNjzttFMd+ei5lge7xXUcVM6J3pyQX7+M80SBZTD3g13R3Xzlz9vMDjHGyvRS6vMq2EL+NkBrLBHts3QFFnNMSluYGzHHhi8BFK+vk3L3nTW9VXp3/sXcA1CbGZ8uibAuXlk/mcGvhvDD+S3wtfT3hw4Vb8bYJUQQ6UQnEwHvf+nbrOcYLn8+tqXNUzsNoRKaXyvuqw== X-OriginatorOrg: arm.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 29 Jun 2020 04:40:42.9942 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 01dfca8b-5cf8-4d7c-085c-08d81be6950d X-MS-Exchange-CrossTenant-Id: f34e5979-57d9-4aaa-ad4d-b122a662184d X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=f34e5979-57d9-4aaa-ad4d-b122a662184d; Ip=[63.35.35.123]; Helo=[64aa7808-outbound-1.mta.getcheckrecipient.com] X-MS-Exchange-CrossTenant-AuthSource: DB5EUR03FT049.eop-EUR03.prod.protection.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: DB6PR0802MB2199 Subject: Re: [dpdk-dev] [PATCH v5 4/4] eal/atomic: add wrapper for c11 atomic thread fence X-BeenThere: dev@dpdk.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: DPDK patches and discussions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: dev-bounces@dpdk.org Sender: "dev" > Subject: [PATCH v5 4/4] eal/atomic: add wrapper for c11 atomic thread fen= ce >=20 > Provide a wrapper for __atomic_thread_fence built-in to support optimized > code for __ATOMIC_SEQ_CST memory order for x86 platforms. >=20 > Suggested-by: Honnappa Nagarahalli > Signed-off-by: Phil Yang > Reviewed-by: Ola Liljedahl > --- > lib/librte_eal/arm/include/rte_atomic_32.h | 6 ++++++ > lib/librte_eal/arm/include/rte_atomic_64.h | 6 ++++++ > lib/librte_eal/include/generic/rte_atomic.h | 6 ++++++ > lib/librte_eal/ppc/include/rte_atomic.h | 6 ++++++ > lib/librte_eal/x86/include/rte_atomic.h | 17 +++++++++++++++++ > 5 files changed, 41 insertions(+) >=20 > diff --git a/lib/librte_eal/arm/include/rte_atomic_32.h > b/lib/librte_eal/arm/include/rte_atomic_32.h > index 7dc0d06..dbe7cc6 100644 > --- a/lib/librte_eal/arm/include/rte_atomic_32.h > +++ b/lib/librte_eal/arm/include/rte_atomic_32.h > @@ -37,6 +37,12 @@ extern "C" { >=20 > #define rte_cio_rmb() rte_rmb() >=20 > +static __rte_always_inline void > +rte_atomic_thread_fence(int mo) > +{ > + __atomic_thread_fence(mo); > +} > + > #ifdef __cplusplus > } > #endif > diff --git a/lib/librte_eal/arm/include/rte_atomic_64.h > b/lib/librte_eal/arm/include/rte_atomic_64.h > index 7b7099c..22ff8ec 100644 > --- a/lib/librte_eal/arm/include/rte_atomic_64.h > +++ b/lib/librte_eal/arm/include/rte_atomic_64.h > @@ -41,6 +41,12 @@ extern "C" { >=20 > #define rte_cio_rmb() asm volatile("dmb oshld" : : : "memory") >=20 > +static __rte_always_inline void > +rte_atomic_thread_fence(int mo) > +{ > + __atomic_thread_fence(mo); > +} > + > /*------------------------ 128 bit atomic operations -------------------= ------*/ >=20 > #if defined(__ARM_FEATURE_ATOMICS) || > defined(RTE_ARM_FEATURE_ATOMICS) diff --git > a/lib/librte_eal/include/generic/rte_atomic.h > b/lib/librte_eal/include/generic/rte_atomic.h > index e6ab15a..5b941db 100644 > --- a/lib/librte_eal/include/generic/rte_atomic.h > +++ b/lib/librte_eal/include/generic/rte_atomic.h > @@ -158,6 +158,12 @@ static inline void rte_cio_rmb(void); > asm volatile ("" : : : "memory"); \ > } while(0) >=20 > +/** > + * Synchronization fence between threads based on the specified > + * memory order. > + */ > +static inline void rte_atomic_thread_fence(int mo); > + > /*------------------------- 16 bit atomic operations -------------------= ------*/ >=20 > /** > diff --git a/lib/librte_eal/ppc/include/rte_atomic.h > b/lib/librte_eal/ppc/include/rte_atomic.h > index 7e3e131..91c5f30 100644 > --- a/lib/librte_eal/ppc/include/rte_atomic.h > +++ b/lib/librte_eal/ppc/include/rte_atomic.h > @@ -40,6 +40,12 @@ extern "C" { >=20 > #define rte_cio_rmb() rte_rmb() >=20 > +static __rte_always_inline void > +rte_atomic_thread_fence(int mo) > +{ > + __atomic_thread_fence(mo); > +} > + > /*------------------------- 16 bit atomic operations -------------------= ------*/ > /* To be compatible with Power7, use GCC built-in functions for 16 bit > * operations */ > diff --git a/lib/librte_eal/x86/include/rte_atomic.h > b/lib/librte_eal/x86/include/rte_atomic.h > index b9dcd30..bd256e7 100644 > --- a/lib/librte_eal/x86/include/rte_atomic.h > +++ b/lib/librte_eal/x86/include/rte_atomic.h > @@ -83,6 +83,23 @@ rte_smp_mb(void) >=20 > #define rte_cio_rmb() rte_compiler_barrier() >=20 > +/** > + * Synchronization fence between threads based on the specified > + * memory order. > + * > + * On x86 the __atomic_thread_fence(__ATOMIC_SEQ_CST) generates > + * full 'mfence' which is quite expensive. The optimized > + * implementation of rte_smp_mb is used instead. > + */ > +static __rte_always_inline void > +rte_atomic_thread_fence(int mo) > +{ > + if (mo =3D=3D __ATOMIC_SEQ_CST) > + rte_smp_mb(); > + else > + __atomic_thread_fence(mo); > +} I think __ATOMIC_SEQ_CST needs to be used rarely. IMO, rte_atomic_thread_fe= nce should be called only for __ATOMIC_SEQ_CST memory order. For all others= the __atomic_thread_fence can be used directly. This will help us to stick= to using the atomic built-ins in most of the cases. Konstantin, is this ok for you? > + > /*------------------------- 16 bit atomic operations -------------------= ------*/ >=20 > #ifndef RTE_FORCE_INTRINSICS > -- > 2.7.4