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GET /api/patches/70503/?format=api
{ "id": 70503, "url": "http://patchwork.dpdk.org/api/patches/70503/?format=api", "web_url": "http://patchwork.dpdk.org/project/dpdk/patch/20200522043013.12535-1-honnappa.nagarahalli@arm.com/", "project": { "id": 1, "url": "http://patchwork.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": "<20200522043013.12535-1-honnappa.nagarahalli@arm.com>", "list_archive_url": "https://inbox.dpdk.org/dev/20200522043013.12535-1-honnappa.nagarahalli@arm.com", "date": "2020-05-22T04:30:13", "name": "[v2] doc: announce adoption of C11 atomic operations semantics", "commit_ref": null, "pull_url": null, "state": "accepted", "archived": true, "hash": "0b1c70e9489f3c6a416fa1102e9f06be1ca95c6b", "submitter": { "id": 1045, "url": "http://patchwork.dpdk.org/api/people/1045/?format=api", "name": "Honnappa Nagarahalli", "email": "honnappa.nagarahalli@arm.com" }, "delegate": { "id": 1, "url": "http://patchwork.dpdk.org/api/users/1/?format=api", "username": "tmonjalo", "first_name": "Thomas", "last_name": "Monjalon", "email": "thomas@monjalon.net" }, "mbox": "http://patchwork.dpdk.org/project/dpdk/patch/20200522043013.12535-1-honnappa.nagarahalli@arm.com/mbox/", "series": [ { "id": 10196, "url": "http://patchwork.dpdk.org/api/series/10196/?format=api", "web_url": "http://patchwork.dpdk.org/project/dpdk/list/?series=10196", "date": "2020-05-22T04:30:13", "name": "[v2] doc: announce adoption of C11 atomic operations semantics", "version": 2, "mbox": "http://patchwork.dpdk.org/series/10196/mbox/" } ], "comments": "http://patchwork.dpdk.org/api/patches/70503/comments/", "check": "success", "checks": "http://patchwork.dpdk.org/api/patches/70503/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 dpdk.org (dpdk.org [92.243.14.124])\n\tby inbox.dpdk.org (Postfix) with ESMTP id 82D4CA0093;\n\tFri, 22 May 2020 06:30:24 +0200 (CEST)", "from [92.243.14.124] (localhost [127.0.0.1])\n\tby dpdk.org (Postfix) with ESMTP id E87491D8D8;\n\tFri, 22 May 2020 06:30:23 +0200 (CEST)", "from foss.arm.com (foss.arm.com [217.140.110.172])\n by dpdk.org (Postfix) with ESMTP id BF6941D73C\n for <dev@dpdk.org>; Fri, 22 May 2020 06:30:21 +0200 (CEST)", "from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14])\n by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id 0633231B;\n Thu, 21 May 2020 21:30:21 -0700 (PDT)", "from qc2400f-1.austin.arm.com (qc2400f-1.austin.arm.com\n [10.118.14.48])\n by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id E4DC33F305;\n Thu, 21 May 2020 21:30:20 -0700 (PDT)" ], "From": "Honnappa Nagarahalli <honnappa.nagarahalli@arm.com>", "To": "dev@dpdk.org, konstantin.ananyev@intel.com, stephen@networkplumber.org,\n jerinj@marvell.com, hemant.agrawal@nxp.com", "Cc": "ruifeng.wang@arm.com, phil.yang@arm.com, honnappa.nagarahalli@arm.com,\n nd@arm.com", "Date": "Thu, 21 May 2020 23:30:13 -0500", "Message-Id": "<20200522043013.12535-1-honnappa.nagarahalli@arm.com>", "X-Mailer": "git-send-email 2.17.1", "In-Reply-To": "<1588835193-27550-1-git-send-email-phil.yang@arm.com>", "References": "<1588835193-27550-1-git-send-email-phil.yang@arm.com>", "Subject": "[dpdk-dev] [PATCH v2] doc: announce adoption of C11 atomic\n\toperations semantics", "X-BeenThere": "dev@dpdk.org", "X-Mailman-Version": "2.1.15", "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": "As agreed in the DPDK tech board [1], after 20.05 release, patches must\nuse C11 atomic operations semantics with the help of wrappers.\n\n[1] http://mails.dpdk.org/archives/dev/2020-April/165143.html\n\nSigned-off-by: Honnappa Nagarahalli <honnappa.nagarahalli@arm.com>\nReviewed-by: Phil Yang <phil.yang@arm.com>\nReviewed-by: Ruifeng Wang <ruifeng.wang@arm.com>\nAcked-by: Hemant Agrawal <hemant.agrawal@nxp.com>\nAcked-by: Jerin Jacob <jerinj@marvell.com>\n---\n doc/guides/rel_notes/deprecation.rst | 13 +++++++++++++\n 1 file changed, 13 insertions(+)", "diff": "diff --git a/doc/guides/rel_notes/deprecation.rst b/doc/guides/rel_notes/deprecation.rst\nindex 20aa745b7..01f99a0d6 100644\n--- a/doc/guides/rel_notes/deprecation.rst\n+++ b/doc/guides/rel_notes/deprecation.rst\n@@ -113,3 +113,16 @@ Deprecation Notices\n Python 2 support will be completely removed in 20.11.\n In 20.08, explicit deprecation warnings will be displayed when running\n scripts with Python 2.\n+\n+* rte_atomicNN_xxx: These APIs do not take memory order parameter. This does\n+ not allow for writing optimized code for all the CPU architectures supported\n+ in DPDK. DPDK will adopt C11 atomic operations semantics and provide wrappers\n+ using C11 atomic built-ins. These wrappers must be used for patches that\n+ need to be merged in 20.08 onwards. This change will not introduce any\n+ performance degradation.\n+\n+* rte_smp_*mb: These APIs provide full barrier functionality. However, many\n+ use cases do not require full barriers. To support such use cases, DPDK will\n+ adopt C11 barrier semantics and provide wrappers using C11 atomic built-ins.\n+ These wrappers must be used for patches that need to be merged in 20.08\n+ onwards. This change will not introduce any performance degradation.\n", "prefixes": [ "v2" ] }