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GET /api/patches/137804/?format=api
{ "id": 137804, "url": "https://patches.dpdk.org/api/patches/137804/?format=api", "web_url": "https://patches.dpdk.org/project/dpdk/patch/20240302135328.531940-4-mattias.ronnblom@ericsson.com/", "project": { "id": 1, "url": "https://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": "<20240302135328.531940-4-mattias.ronnblom@ericsson.com>", "list_archive_url": "https://inbox.dpdk.org/dev/20240302135328.531940-4-mattias.ronnblom@ericsson.com", "date": "2024-03-02T13:53:24", "name": "[RFC,3/7] eal: add bit manipulation functions which read or write once", "commit_ref": null, "pull_url": null, "state": "superseded", "archived": false, "hash": "13bb5eb6c13484945a045a47f7253f57cf84892e", "submitter": { "id": 1077, "url": "https://patches.dpdk.org/api/people/1077/?format=api", "name": "Mattias Rönnblom", "email": "mattias.ronnblom@ericsson.com" }, "delegate": { "id": 1, "url": "https://patches.dpdk.org/api/users/1/?format=api", "username": "tmonjalo", "first_name": "Thomas", "last_name": "Monjalon", "email": "thomas@monjalon.net" }, "mbox": "https://patches.dpdk.org/project/dpdk/patch/20240302135328.531940-4-mattias.ronnblom@ericsson.com/mbox/", "series": [ { "id": 31345, "url": "https://patches.dpdk.org/api/series/31345/?format=api", "web_url": "https://patches.dpdk.org/project/dpdk/list/?series=31345", "date": "2024-03-02T13:53:21", "name": "Improve EAL bit operations API", "version": 1, "mbox": "https://patches.dpdk.org/series/31345/mbox/" } ], "comments": "https://patches.dpdk.org/api/patches/137804/comments/", "check": "warning", "checks": "https://patches.dpdk.org/api/patches/137804/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 9CCB143C3A;\n\tSat, 2 Mar 2024 15:02:47 +0100 (CET)", "from mails.dpdk.org (localhost [127.0.0.1])\n\tby mails.dpdk.org (Postfix) with ESMTP id 4DFA042DC3;\n\tSat, 2 Mar 2024 15:02:22 +0100 (CET)", "from EUR02-VI1-obe.outbound.protection.outlook.com\n (mail-vi1eur02on2051.outbound.protection.outlook.com [40.107.241.51])\n by mails.dpdk.org (Postfix) with ESMTP id 3981242D7D\n for <dev@dpdk.org>; Sat, 2 Mar 2024 15:02:18 +0100 (CET)", "from AM7PR03CA0010.eurprd03.prod.outlook.com (2603:10a6:20b:130::20)\n by DB8PR07MB6428.eurprd07.prod.outlook.com (2603:10a6:10:132::23)\n with Microsoft SMTP Server (version=TLS1_2,\n cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.7339.32; Sat, 2 Mar\n 2024 14:02:16 +0000", "from AMS0EPF00000197.eurprd05.prod.outlook.com\n (2603:10a6:20b:130:cafe::a2) by AM7PR03CA0010.outlook.office365.com\n (2603:10a6:20b:130::20) with Microsoft SMTP Server (version=TLS1_2,\n cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.7339.34 via Frontend\n Transport; Sat, 2 Mar 2024 14:02:16 +0000", "from oa.msg.ericsson.com (192.176.1.74) by\n AMS0EPF00000197.mail.protection.outlook.com (10.167.16.219) with Microsoft\n SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id\n 15.20.7362.11 via Frontend Transport; Sat, 2 Mar 2024 14:02:15 +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 15.2.1258.12; Sat, 2 Mar 2024 15:02:15 +0100", "from breslau.. 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<mattias.ronnblom@ericsson.com>", "Subject": "[RFC 3/7] eal: add bit manipulation functions which read or write\n once", "Date": "Sat, 2 Mar 2024 14:53:24 +0100", "Message-ID": "<20240302135328.531940-4-mattias.ronnblom@ericsson.com>", "X-Mailer": "git-send-email 2.34.1", "In-Reply-To": "<20240302135328.531940-1-mattias.ronnblom@ericsson.com>", "References": "<20240302135328.531940-1-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": "AMS0EPF00000197:EE_|DB8PR07MB6428:EE_", "X-MS-Office365-Filtering-Correlation-Id": "06f2e0a1-1799-4b23-2a8f-08dc3ac15df7", "X-MS-Exchange-SenderADCheck": "1", "X-MS-Exchange-AntiSpam-Relay": "0", "X-Microsoft-Antispam": "BCL:0;", "X-Microsoft-Antispam-Message-Info": "\n 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", "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)(376005)(36860700004)(82310400014); DIR:OUT;\n SFP:1101;", "X-OriginatorOrg": "ericsson.com", "X-MS-Exchange-CrossTenant-OriginalArrivalTime": "02 Mar 2024 14:02:15.8721 (UTC)", "X-MS-Exchange-CrossTenant-Network-Message-Id": "\n 06f2e0a1-1799-4b23-2a8f-08dc3ac15df7", "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 AMS0EPF00000197.eurprd05.prod.outlook.com", "X-MS-Exchange-CrossTenant-AuthAs": "Anonymous", "X-MS-Exchange-CrossTenant-FromEntityHeader": "HybridOnPrem", "X-MS-Exchange-Transport-CrossTenantHeadersStamped": "DB8PR07MB6428", "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\nSigned-off-by: Mattias Rönnblom <mattias.ronnblom@ericsson.com>\n---\n lib/eal/include/rte_bitops.h | 229 +++++++++++++++++++++++++++++++++++\n 1 file changed, 229 insertions(+)", "diff": "diff --git a/lib/eal/include/rte_bitops.h b/lib/eal/include/rte_bitops.h\nindex afd0f11033..3118c51748 100644\n--- a/lib/eal/include/rte_bitops.h\n+++ b/lib/eal/include/rte_bitops.h\n@@ -338,6 +338,227 @@ rte_bit_assign64(uint64_t *addr, unsigned int nr, bool value)\n \t\trte_bit_clear64(addr, nr);\n }\n \n+/**\n+ * Test exactly once if a particular bit in a 32-bit word is set.\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_set32(addr, 17);\n+ * if (rte_bit_once_test32(addr, 17)) {\n+ * ...\n+ * }\n+ * \\endcode\n+ *\n+ * In the above example, rte_bit_once_set32() may not be removed by\n+ * the compiler, which would be allowed in case rte_bit_set32() and\n+ * rte_bit_test32() was used.\n+ *\n+ * \\code{.c}\n+ * while (rte_bit_once_test32(addr, 17);\n+ * ;\n+ * \\endcode\n+ *\n+ * In case rte_bit_test32(addr, 17) was used instead, the resulting\n+ * object code could (and in many cases would be) replaced with\n+ * with the equivalent to\n+ * \\code{.c}\n+ * if (rte_bit_test32(addr, 17)) {\n+ * for (;;) // spin forever\n+ * ;\n+ * }\n+ * \\endcode\n+ *\n+ * The regular bit set operations (e.g., rte_bit_test32()) should be\n+ * preffered over the \"once\" family of operations (e.g.,\n+ * rte_bit_once_test32()), since the latter may prevent optimizations\n+ * crucial for run-time performance.\n+ *\n+ * This function does not give any guarantees in regards to memory\n+ * ordering (except ordering from the same thread to the same memory\n+ * location) or atomicity.\n+ *\n+ * @param addr\n+ * A pointer to the 32-bit word to query.\n+ * @param nr\n+ * The index of the bit (0-31).\n+ * @return\n+ * Returns true if the bit is set, and false otherwise.\n+ */\n+\n+static inline bool\n+rte_bit_once_test32(const volatile uint32_t *addr, unsigned int nr);\n+\n+/**\n+ * Set bit in 32-bit word exactly once.\n+ *\n+ * Set bit specified by @c nr in the 32-bit word pointed to by\n+ * @c addr to '1'.\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 function does not give any guarantees in regards to memory\n+ * ordering or atomicity.\n+ *\n+ * @param addr\n+ * A pointer to the 32-bit word to modify.\n+ * @param nr\n+ * The index of the bit (0-31).\n+ */\n+static inline void\n+rte_bit_once_set32(volatile uint32_t *addr, unsigned int nr);\n+\n+/**\n+ * Clear bit in 32-bit word exactly once.\n+ *\n+ * Set bit specified by @c nr in the 32-bit word pointed to by @c addr\n+ * to '0'.\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_once_test32() for more information and uses cases for the\n+ * \"once\" class of functions.\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 32-bit word to modify.\n+ * @param nr\n+ * The index of the bit (0-31).\n+ */\n+static inline void\n+rte_bit_once_clear32(volatile uint32_t *addr, unsigned int nr);\n+\n+/**\n+ * Assign a value to bit in a 32-bit word exactly once.\n+ *\n+ * Set bit specified by @c nr in the 32-bit word pointed to by\n+ * @c addr to the value indicated by @c value.\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 32-bit word to modify.\n+ * @param nr\n+ * The index of the bit (0-31).\n+ * @param value\n+ * The new value of the bit - true for '1', or false for '0'.\n+ */\n+static inline void\n+rte_bit_once_assign32(uint32_t *addr, unsigned int nr, bool value)\n+{\n+\tif (value)\n+\t\trte_bit_once_set32(addr, nr);\n+\telse\n+\t\trte_bit_once_clear32(addr, nr);\n+}\n+\n+/**\n+ * Test exactly once if a particular bit in a 64-bit word is set.\n+ *\n+ * This function is guaranteed to result in exactly one memory load.\n+ * See rte_bit_once_test32() for more information and uses cases for the\n+ * \"once\" class of functions.\n+ *\n+ * rte_v_bit_test64() does give any guarantees in regards to memory\n+ * ordering or atomicity.\n+ *\n+ * @param addr\n+ * A pointer to the 64-bit word to query.\n+ * @param nr\n+ * The index of the bit (0-63).\n+ * @return\n+ * Returns true if the bit is set, and false otherwise.\n+ */\n+\n+static inline bool\n+rte_bit_once_test64(const volatile uint64_t *addr, unsigned int nr);\n+\n+/**\n+ * Set bit in 64-bit word exactly once.\n+ *\n+ * Set bit specified by @c nr in the 64-bit word pointed to by\n+ * @c addr to '1'.\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_once_test32() for more information and uses cases for the\n+ * \"once\" class of functions.\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 64-bit word to modify.\n+ * @param nr\n+ * The index of the bit (0-63).\n+ */\n+static inline void\n+rte_bit_once_set64(volatile uint64_t *addr, unsigned int nr);\n+\n+/**\n+ * Clear bit in 64-bit word exactly once.\n+ *\n+ * Set bit specified by @c nr in the 64-bit word pointed to by @c addr\n+ * to '0'.\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_once_test32() for more information and uses cases for the\n+ * \"once\" class of functions.\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 64-bit word to modify.\n+ * @param nr\n+ * The index of the bit (0-63).\n+ */\n+static inline void\n+rte_bit_once_clear64(volatile uint64_t *addr, unsigned int nr);\n+\n+/**\n+ * Assign a value to bit in a 64-bit word exactly once.\n+ *\n+ * Set bit specified by @c nr in the 64-bit word pointed to by\n+ * @c addr to the value indicated by @c value.\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 64-bit word to modify.\n+ * @param nr\n+ * The index of the bit (0-63).\n+ * @param value\n+ * The new value of the bit - true for '1', or false for '0'.\n+ */\n+static inline void\n+rte_bit_once_assign64(volatile uint64_t *addr, unsigned int nr, bool value)\n+{\n+\tif (value)\n+\t\trte_bit_once_set64(addr, nr);\n+\telse\n+\t\trte_bit_once_clear64(addr, nr);\n+}\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@@ -376,6 +597,14 @@ __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 /*------------------------ 32-bit relaxed operations ------------------------*/\n \n /**\n", "prefixes": [ "RFC", "3/7" ] }