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GET /api/patches/139720/?format=api
{ "id": 139720, "url": "http://patches.dpdk.org/api/patches/139720/?format=api", "web_url": "http://patches.dpdk.org/project/dpdk/patch/20240429095138.106849-4-mattias.ronnblom@ericsson.com/", "project": { "id": 1, "url": "http://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": "<20240429095138.106849-4-mattias.ronnblom@ericsson.com>", "list_archive_url": "https://inbox.dpdk.org/dev/20240429095138.106849-4-mattias.ronnblom@ericsson.com", "date": "2024-04-29T09:51:35", "name": "[RFC,v3,3/6] eal: add exactly-once bit access functions", "commit_ref": null, "pull_url": null, "state": "new", "archived": false, "hash": "e0a87a9748cb1e427ea4f3103a55e020fd5f293e", "submitter": { "id": 1077, "url": "http://patches.dpdk.org/api/people/1077/?format=api", "name": "Mattias Rönnblom", "email": "mattias.ronnblom@ericsson.com" }, "delegate": { "id": 1, "url": "http://patches.dpdk.org/api/users/1/?format=api", "username": "tmonjalo", "first_name": "Thomas", "last_name": "Monjalon", "email": "thomas@monjalon.net" }, "mbox": "http://patches.dpdk.org/project/dpdk/patch/20240429095138.106849-4-mattias.ronnblom@ericsson.com/mbox/", "series": [ { "id": 31838, "url": "http://patches.dpdk.org/api/series/31838/?format=api", "web_url": "http://patches.dpdk.org/project/dpdk/list/?series=31838", "date": "2024-04-29T09:51:32", "name": "Improve EAL bit operations API", "version": 3, "mbox": "http://patches.dpdk.org/series/31838/mbox/" } ], "comments": "http://patches.dpdk.org/api/patches/139720/comments/", "check": "pending", "checks": "http://patches.dpdk.org/api/patches/139720/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 417D543F49;\n\tMon, 29 Apr 2024 12:02:27 +0200 (CEST)", "from mails.dpdk.org (localhost [127.0.0.1])\n\tby mails.dpdk.org (Postfix) with ESMTP id DFE5E402EB;\n\tMon, 29 Apr 2024 12:02:12 +0200 (CEST)", "from EUR04-VI1-obe.outbound.protection.outlook.com\n (mail-vi1eur04on2042.outbound.protection.outlook.com [40.107.8.42])\n by mails.dpdk.org (Postfix) with ESMTP id E8453402D0\n for <dev@dpdk.org>; Mon, 29 Apr 2024 12:02:08 +0200 (CEST)", "from DU2PR04CA0069.eurprd04.prod.outlook.com (2603:10a6:10:232::14)\n by AM7PR07MB6232.eurprd07.prod.outlook.com (2603:10a6:20b:135::7)\n with Microsoft SMTP Server (version=TLS1_2,\n cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.7472.44; Mon, 29 Apr\n 2024 10:02:07 +0000", "from DB1PEPF00039231.eurprd03.prod.outlook.com\n (2603:10a6:10:232:cafe::ed) by DU2PR04CA0069.outlook.office365.com\n (2603:10a6:10:232::14) with Microsoft SMTP Server (version=TLS1_2,\n cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.7519.34 via Frontend\n Transport; Mon, 29 Apr 2024 10:02:07 +0000", "from oa.msg.ericsson.com (192.176.1.74) by\n DB1PEPF00039231.mail.protection.outlook.com (10.167.8.104) with Microsoft\n SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id\n 15.20.7519.19 via Frontend Transport; Mon, 29 Apr 2024 10:02:07 +0000", "from seliicinfr00050.seli.gic.ericsson.se (153.88.142.248) by\n smtp-central.internal.ericsson.com (100.87.178.66) with Microsoft SMTP Server\n id 15.2.1544.9; Mon, 29 Apr 2024 12:02:06 +0200", "from breslau.. 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helo=oa.msg.ericsson.com; pr=C", "From": "=?utf-8?q?Mattias_R=C3=B6nnblom?= <mattias.ronnblom@ericsson.com>", "To": "<dev@dpdk.org>", "CC": "<hofors@lysator.liu.se>, Heng Wang <heng.wang@ericsson.com>,\n \"Stephen Hemminger\" <stephen@networkplumber.org>,\n Tyler Retzlaff <roretzla@linux.microsoft.com>,\n =?utf-8?q?Morten_Br=C3=B8rup?= <mb@smartsharesystems.com>, =?utf-8?q?Mattia?=\n\t=?utf-8?q?s_R=C3=B6nnblom?= <mattias.ronnblom@ericsson.com>", "Subject": "[RFC v3 3/6] eal: add exactly-once bit access functions", "Date": "Mon, 29 Apr 2024 11:51:35 +0200", "Message-ID": "<20240429095138.106849-4-mattias.ronnblom@ericsson.com>", "X-Mailer": "git-send-email 2.34.1", "In-Reply-To": "<20240429095138.106849-1-mattias.ronnblom@ericsson.com>", "References": "<20240425085853.97888-2-mattias.ronnblom@ericsson.com>\n <20240429095138.106849-1-mattias.ronnblom@ericsson.com>", "MIME-Version": "1.0", "Content-Type": "text/plain; charset=\"UTF-8\"", "Content-Transfer-Encoding": "8bit", "X-EOPAttributedMessage": "0", "X-MS-PublicTrafficType": "Email", "X-MS-TrafficTypeDiagnostic": "DB1PEPF00039231:EE_|AM7PR07MB6232:EE_", "X-MS-Office365-Filtering-Correlation-Id": "5124dfca-bda7-494c-1f61-08dc68336d9f", "X-MS-Exchange-SenderADCheck": "1", "X-MS-Exchange-AntiSpam-Relay": "0", "X-Microsoft-Antispam": "BCL:0;", "X-Microsoft-Antispam-Message-Info": "=?utf-8?q?LMTMLkkKVTwIUsYdTFVk4++eIHdC5Mx?=\n\t=?utf-8?q?TnC+ZYybsfp1EDYiAg4MVQ8L+JMIl1Dun4zVwTGMRmkyPH1LDLNbgunLU4Z9b6tA9?=\n\t=?utf-8?q?UwtIMFwi9bzPGO+vBsJl5qmKSBdP25wktCC5Teux+5fDZOJGDQHx3Mm1AzwRHzRnF?=\n\t=?utf-8?q?/lgtBbOJkZxBUr0g5FVxDE4oaN+FV/jSAvAIRYEv+iWgT2q3Goh4SB7YfeGj198cw?=\n\t=?utf-8?q?SLFRuVLLJKF8sazj8lyYDCPFplJtP54k/yqgEwbOZUKzDlJhQ3cKSOgl6QO2WxfZo?=\n\t=?utf-8?q?Ss/7FKpOAmrUXypwS8ADPS0+i6OrS3KJOnBfPzYsanrv66j8ydH4ihCayCgp83dNN?=\n\t=?utf-8?q?Bhf4YDwLkom9+ewspNwlJxSf3Pd3AKTI8NkwNTNtuZe4y67QSso1lJHm8iG4mPzAX?=\n\t=?utf-8?q?KzKL4Q3FGfrNYBUfDMITUH6PcoPYVGSXHVBHoWBAWehxE9/CHwWDbEoHDzJ/ixjM6?=\n\t=?utf-8?q?ZF2zNEh1dZUtc8M8/7DYH60TRuPh+YbSwnB78DoggY/utLjJC4jHUigOLt0WbpCEq?=\n\t=?utf-8?q?mBfxwi0Ww399/7f+FcWp7ZTFL1q08CIRndMj86M7+c75VPtcqnEU567ryIc45AIRR?=\n\t=?utf-8?q?clv/3kX2NXlZR4/xH8YG6/BkIzwyyfYG+mg9EirTB7n2ebRDAQaLOpRPCCknTA8LV?=\n\t=?utf-8?q?qe4Y/alyZJiIVlnwnmPdg6W7XHhxPOQoqXKayoR0oR3Hrn026fSAETX03snHpno2Q?=\n\t=?utf-8?q?9ALPNTsCpEsPp2DG067CBRfGr07hz5tYc5I3LYmoUMWAZhorUx4umpaS95UKEDFZ1?=\n\t=?utf-8?q?uGy8uIdSvL0WlAX3jPO5Gl/O10pbpdyU+9+8ztOj6HK6EfV/cFPvC+jX12smqVgGa?=\n\t=?utf-8?q?vzWdulE/7r3PlGCPX0s5Y4Q7qUqR9W06hA0QGGqifD7BCKcIkhB9ujUd5GTEN869R?=\n\t=?utf-8?q?Ho1g4rhBcwSy1xe/JVflL/s3fQwcXie8yR07m7HF8Y5KuEL6pBLSRN7SdGRWlA2rb?=\n\t=?utf-8?q?0L8ypWBN9aq2a22DhFbat4mGsk4yRrvpSSlZWCKs0ZbPl7zyaUJBUthg9bZieNf+5?=\n\t=?utf-8?q?rWqEPP+caPZBEGf4KSdPG9nKvw1Cr2Nslk/2Vvix5LxGk4h0yjSrtR00f+anS/hST?=\n\t=?utf-8?q?LYAEzICsZrxcAwG+q3Tx7pBZgUpQQbe6GfFAynqMXy0rLlrbCiNq9hG/F0HlVDHVI?=\n\t=?utf-8?q?h5umcT2Tp4WztpRmpGTuLAWM286rB6FBqj0dj5SmrRd5rRgWvBD1tt/22DFBye5j0?=\n\t=?utf-8?q?oOMoCiVjQKUB2GWdV2S0H3o3urHICBWFup6kQ0Q1U88u9SKlK+KgAuAKobH8VaVpd?=\n\t=?utf-8?q?3X23Dyx/XWv1W9qEK3wpC/PEcaJsUohHJ3sc1oWci/jgh2nKLLLyO4FCuRMCjT7HO?=\n\t=?utf-8?q?NaVd2hYEG7fx?=", "X-Forefront-Antispam-Report": "CIP:192.176.1.74; CTRY:SE; LANG:en; SCL:1; SRV:;\n IPV:NLI; SFV:NSPM; H:oa.msg.ericsson.com; PTR:office365.se.ericsson.net;\n CAT:NONE; SFS:(13230031)(1800799015)(82310400014)(376005)(36860700004);\n DIR:OUT; SFP:1101;", "X-OriginatorOrg": "ericsson.com", "X-MS-Exchange-CrossTenant-OriginalArrivalTime": "29 Apr 2024 10:02:07.0595 (UTC)", "X-MS-Exchange-CrossTenant-Network-Message-Id": "\n 5124dfca-bda7-494c-1f61-08dc68336d9f", "X-MS-Exchange-CrossTenant-Id": "92e84ceb-fbfd-47ab-be52-080c6b87953f", "X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp": "\n TenantId=92e84ceb-fbfd-47ab-be52-080c6b87953f; Ip=[192.176.1.74];\n Helo=[oa.msg.ericsson.com]", "X-MS-Exchange-CrossTenant-AuthSource": "\n DB1PEPF00039231.eurprd03.prod.outlook.com", "X-MS-Exchange-CrossTenant-AuthAs": "Anonymous", "X-MS-Exchange-CrossTenant-FromEntityHeader": "HybridOnPrem", "X-MS-Exchange-Transport-CrossTenantHeadersStamped": "AM7PR07MB6232", "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" }, "content": "Add bit test/set/clear/assign functions which prevents certain\ncompiler optimizations and guarantees that program-level memory loads\nand/or stores will actually occur.\n\nThese functions are useful when interacting with memory-mapped\nhardware devices.\n\nThe \"once\" family of functions does not promise atomicity and provides\nno memory ordering guarantees beyond the C11 relaxed memory model.\n\nRFC v3:\n * Work around lack of C++ support for _Generic (Tyler Retzlaff).\n\nSigned-off-by: Mattias Rönnblom <mattias.ronnblom@ericsson.com>\n---\n lib/eal/include/rte_bitops.h | 180 +++++++++++++++++++++++++++++++++++\n 1 file changed, 180 insertions(+)", "diff": "diff --git a/lib/eal/include/rte_bitops.h b/lib/eal/include/rte_bitops.h\nindex fb2e3dae7b..eac3f8b86a 100644\n--- a/lib/eal/include/rte_bitops.h\n+++ b/lib/eal/include/rte_bitops.h\n@@ -201,6 +201,147 @@ extern \"C\" {\n \t\t uint32_t *: __rte_bit_assign32,\t\t\t\\\n \t\t uint64_t *: __rte_bit_assign64)(addr, nr, value)\n \n+/**\n+ * @warning\n+ * @b EXPERIMENTAL: this API may change without prior notice.\n+ *\n+ * Generic selection macro to test exactly once the value of a bit in\n+ * a 32-bit or 64-bit word. The type of operation depends on the type\n+ * of the @c addr parameter.\n+ *\n+ * This function is guaranteed to result in exactly one memory load\n+ * (e.g., it may not be eliminate or merged by the compiler).\n+ *\n+ * \\code{.c}\n+ * rte_bit_once_set(addr, 17);\n+ * if (rte_bit_once_test(addr, 17)) {\n+ * ...\n+ * }\n+ * \\endcode\n+ *\n+ * In the above example, rte_bit_once_set() may not be removed by\n+ * the compiler, which would be allowed in case rte_bit_set() and\n+ * rte_bit_test() was used.\n+ *\n+ * \\code{.c}\n+ * while (rte_bit_once_test(addr, 17);\n+ * ;\n+ * \\endcode\n+ *\n+ * In case rte_bit_test(addr, 17) was used instead, the resulting\n+ * object code could (and in many cases would be) replaced with\n+ * the equivalent to\n+ * \\code{.c}\n+ * if (rte_bit_test(addr, 17)) {\n+ * for (;;) // spin forever\n+ * ;\n+ * }\n+ * \\endcode\n+ *\n+ * rte_bit_once_test() does not give any guarantees in regards to\n+ * memory ordering or atomicity.\n+ *\n+ * The regular bit set operations (e.g., rte_bit_test()) should be\n+ * preferred over the \"once\" family of operations (e.g.,\n+ * rte_bit_once_test()) if possible, since the latter may prevent\n+ * optimizations crucial for run-time performance.\n+ *\n+ * @param addr\n+ * A pointer to the word to query.\n+ * @param nr\n+ * The index of the bit.\n+ * @return\n+ * Returns true if the bit is set, and false otherwise.\n+ */\n+\n+#define rte_bit_once_test(addr, nr)\t\t\t\t\\\n+\t_Generic((addr),\t\t\t\t\t\\\n+\t\t uint32_t *: __rte_bit_once_test32,\t\t\\\n+\t\t uint64_t *: __rte_bit_once_test64)(addr, nr)\n+\n+/**\n+ * @warning\n+ * @b EXPERIMENTAL: this API may change without prior notice.\n+ *\n+ * Set bit in word exactly once.\n+ *\n+ * Set bit specified by @c nr in the word pointed to by @c addr to '1'\n+ * exactly once.\n+ *\n+ * This function is guaranteed to result in exactly one memory load\n+ * and exactly one memory store, *or* an atomic bit set operation.\n+ *\n+ * See rte_bit_test_once32() for more information and uses cases for\n+ * the \"once\" class of functions.\n+ *\n+ * This macro does not give any guarantees in regards to memory\n+ * ordering or atomicity.\n+ *\n+ * @param addr\n+ * A pointer to the word to modify.\n+ * @param nr\n+ * The index of the bit.\n+ */\n+#define rte_bit_once_set(addr, nr)\t\t\t\t\\\n+\t_Generic((addr),\t\t\t\t\t\\\n+\t\t uint32_t *: __rte_bit_once_set32,\t\t\\\n+\t\t uint64_t *: __rte_bit_once_set64)(addr, nr)\n+\n+/**\n+ * @warning\n+ * @b EXPERIMENTAL: this API may change without prior notice.\n+ *\n+ * Clear bit in word exactly once.\n+ *\n+ * Set bit specified by @c nr in the word pointed to by @c addr to '0'\n+ * exactly once.\n+ *\n+ * This function is guaranteed to result in exactly one memory load\n+ * and exactly one memory store, *or* an atomic bit clear operation.\n+ *\n+ * See rte_bit_test_once32() for more information and uses cases for\n+ * the \"once\" class of functions.\n+ *\n+ * This macro does not give any guarantees in regards to memory\n+ * ordering or atomicity.\n+ *\n+ * @param addr\n+ * A pointer to the word to modify.\n+ * @param nr\n+ * The index of the bit.\n+ */\n+#define rte_bit_once_clear(addr, nr)\t\t\t\t\\\n+\t_Generic((addr),\t\t\t\t\t\\\n+\t\t uint32_t *: __rte_bit_once_clear32,\t\t\\\n+\t\t uint64_t *: __rte_bit_once_clear64)(addr, nr)\n+\n+/**\n+ * @warning\n+ * @b EXPERIMENTAL: this API may change without prior notice.\n+ *\n+ * Assign a value to bit in a word exactly once.\n+ *\n+ * Set bit specified by @c nr in the word pointed to by @c addr to the\n+ * value indicated by @c value exactly once.\n+ *\n+ * This function is guaranteed to result in exactly one memory load\n+ * and exactly one memory store, *or* an atomic bit clear operation.\n+ *\n+ * This function does not give any guarantees in regards to memory\n+ * ordering or atomicity.\n+ *\n+ * @param addr\n+ * A pointer to the word to modify.\n+ * @param nr\n+ * The index of the bit.\n+ * @param value\n+ * The new value of the bit - true for '1', or false for '0'.\n+ */\n+#define rte_bit_once_assign(addr, nr, value)\t\t\t\t\\\n+\t_Generic((addr),\t\t\t\t\t\t\\\n+\t\t uint32_t *: __rte_bit_once_assign32,\t\t\t\\\n+\t\t uint64_t *: __rte_bit_once_assign64)(addr, nr, value)\n+\n #define __RTE_GEN_BIT_TEST(name, size, qualifier)\t\t\t\\\n \tstatic inline bool\t\t\t\t\t\t\\\n \tname(const qualifier uint ## size ## _t *addr, unsigned int nr)\t\\\n@@ -239,6 +380,14 @@ __RTE_GEN_BIT_TEST(__rte_bit_test64, 64, )\n __RTE_GEN_BIT_SET(__rte_bit_set64, 64, )\n __RTE_GEN_BIT_CLEAR(__rte_bit_clear64, 64, )\n \n+__RTE_GEN_BIT_TEST(__rte_bit_once_test32, 32, volatile)\n+__RTE_GEN_BIT_SET(__rte_bit_once_set32, 32, volatile)\n+__RTE_GEN_BIT_CLEAR(__rte_bit_once_clear32, 32, volatile)\n+\n+__RTE_GEN_BIT_TEST(__rte_bit_once_test64, 64, volatile)\n+__RTE_GEN_BIT_SET(__rte_bit_once_set64, 64, volatile)\n+__RTE_GEN_BIT_CLEAR(__rte_bit_once_clear64, 64, volatile)\n+\n __rte_experimental\n static inline void\n __rte_bit_assign32(uint32_t *addr, unsigned int nr, bool value)\n@@ -259,6 +408,27 @@ __rte_bit_assign64(uint64_t *addr, unsigned int nr, bool value)\n \t\t__rte_bit_clear64(addr, nr);\n }\n \n+\n+__rte_experimental\n+static inline void\n+__rte_bit_once_assign32(uint32_t *addr, unsigned int nr, bool value)\n+{\n+\tif (value)\n+\t\t__rte_bit_once_set32(addr, nr);\n+\telse\n+\t\t__rte_bit_once_clear32(addr, nr);\n+}\n+\n+__rte_experimental\n+static inline void\n+__rte_bit_once_assign64(volatile uint64_t *addr, unsigned int nr, bool value)\n+{\n+\tif (value)\n+\t\t__rte_bit_once_set64(addr, nr);\n+\telse\n+\t\t__rte_bit_once_clear64(addr, nr);\n+}\n+\n /*------------------------ 32-bit relaxed operations ------------------------*/\n \n /**\n@@ -953,6 +1123,11 @@ rte_log2_u64(uint64_t v)\n #undef rte_bit_clear\n #undef rte_bit_assign\n \n+#undef rte_bit_once_test\n+#undef rte_bit_once_set\n+#undef rte_bit_once_clear\n+#undef rte_bit_once_assign\n+\n #define __RTE_BIT_OVERLOAD_SZ_2(fun, qualifier, size, arg1_type, arg1_name) \\\n \tstatic inline void\t\t\t\t\t\t\\\n \trte_bit_ ## fun(qualifier uint ## size ## _t *addr,\t\t\\\n@@ -1001,6 +1176,11 @@ __RTE_BIT_OVERLOAD_2(set, , unsigned int, nr)\n __RTE_BIT_OVERLOAD_2(clear, , unsigned int, nr)\n __RTE_BIT_OVERLOAD_3(assign, , unsigned int, nr, bool, value)\n \n+__RTE_BIT_OVERLOAD_2R(once_test, const volatile, bool, unsigned int, nr)\n+__RTE_BIT_OVERLOAD_2(once_set, volatile, unsigned int, nr)\n+__RTE_BIT_OVERLOAD_2(once_clear, volatile, unsigned int, nr)\n+__RTE_BIT_OVERLOAD_3(once_assign, volatile, unsigned int, nr, bool, value)\n+\n #endif\n \n #endif /* _RTE_BITOPS_H_ */\n", "prefixes": [ "RFC", "v3", "3/6" ] }