From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from dpdk.org (dpdk.org [92.243.14.124]) by inbox.dpdk.org (Postfix) with ESMTP id 2974EA04B5; Wed, 30 Sep 2020 15:08:27 +0200 (CEST) Received: from [92.243.14.124] (localhost [127.0.0.1]) by dpdk.org (Postfix) with ESMTP id 3D54A1D629; Wed, 30 Sep 2020 15:08:10 +0200 (CEST) Received: from mga18.intel.com (mga18.intel.com [134.134.136.126]) by dpdk.org (Postfix) with ESMTP id A173D1D614 for ; Wed, 30 Sep 2020 15:08:05 +0200 (CEST) IronPort-SDR: lo7p61BFbjQC5HgDRQZR+A8IMZFC1uOHYdde0rZqqPm4j936nroYszyqdf7pABdsRIFf/QxEDv k4kD67dmbVHw== X-IronPort-AV: E=McAfee;i="6000,8403,9759"; a="150223433" X-IronPort-AV: E=Sophos;i="5.77,322,1596524400"; d="scan'208";a="150223433" X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from fmsmga008.fm.intel.com ([10.253.24.58]) by orsmga106.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 30 Sep 2020 06:08:04 -0700 IronPort-SDR: 3U4m/nSfvIKmbqcXwTy3cqH5e+EpM8piFRdnRl7CqNARzcCwTaNTiv5YC3U4OhLpEMOlWsTql3 XOTo//18MWiA== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.77,322,1596524400"; d="scan'208";a="294603152" Received: from silpixa00399953.ir.intel.com (HELO silpixa00399953.ger.corp.intel.com) ([10.237.222.53]) by fmsmga008.fm.intel.com with ESMTP; 30 Sep 2020 06:08:02 -0700 From: Ciara Power To: dev@dpdk.org Cc: Ciara Power , Ray Kinsella , Neil Horman Date: Wed, 30 Sep 2020 14:03:57 +0100 Message-Id: <20200930130415.11211-2-ciara.power@intel.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20200930130415.11211-1-ciara.power@intel.com> References: <20200807155859.63888-1-ciara.power@intel.com> <20200930130415.11211-1-ciara.power@intel.com> Subject: [dpdk-dev] [PATCH v3 01/18] eal: add max SIMD bitwidth 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" This patch adds a max SIMD bitwidth EAL configuration. The API allows for an app to set this value. It can also be set using EAL argument --force-max-simd-bitwidth, which will lock the value and override any modifications made by the app. Signed-off-by: Ciara Power --- v3: - Added enum value to essentially disable using max SIMD to choose paths, intended for use by ARM SVE. - Fixed parsing bitwidth argument to return an error for values greater than uint16_t. v2: Added to Doxygen comment for API. --- lib/librte_eal/common/eal_common_options.c | 64 ++++++++++++++++++++++ lib/librte_eal/common/eal_internal_cfg.h | 8 +++ lib/librte_eal/common/eal_options.h | 2 + lib/librte_eal/include/rte_eal.h | 33 +++++++++++ lib/librte_eal/rte_eal_version.map | 4 ++ 5 files changed, 111 insertions(+) diff --git a/lib/librte_eal/common/eal_common_options.c b/lib/librte_eal/common/eal_common_options.c index a5426e1234..e9117a96af 100644 --- a/lib/librte_eal/common/eal_common_options.c +++ b/lib/librte_eal/common/eal_common_options.c @@ -102,6 +102,7 @@ eal_long_options[] = { {OPT_MATCH_ALLOCATIONS, 0, NULL, OPT_MATCH_ALLOCATIONS_NUM}, {OPT_TELEMETRY, 0, NULL, OPT_TELEMETRY_NUM }, {OPT_NO_TELEMETRY, 0, NULL, OPT_NO_TELEMETRY_NUM }, + {OPT_FORCE_MAX_SIMD_BITWIDTH, 1, NULL, OPT_FORCE_MAX_SIMD_BITWIDTH_NUM}, {0, 0, NULL, 0 } }; @@ -1309,6 +1310,34 @@ eal_parse_iova_mode(const char *name) return 0; } +static int +eal_parse_simd_bitwidth(const char *arg, bool locked) +{ + char *end; + unsigned long bitwidth; + int ret; + struct internal_config *internal_conf = + eal_get_internal_configuration(); + + if (arg == NULL || arg[0] == '\0') + return -1; + + errno = 0; + bitwidth = strtoul(arg, &end, 0); + + /* check for errors */ + if (bitwidth > UINT16_MAX || errno != 0 || end == NULL || *end != '\0') + return -1; + + if (bitwidth == 0) + bitwidth = UINT16_MAX; + ret = rte_set_max_simd_bitwidth(bitwidth); + if (ret < 0) + return -1; + internal_conf->max_simd_bitwidth.locked = locked; + return 0; +} + static int eal_parse_base_virtaddr(const char *arg) { @@ -1707,6 +1736,13 @@ eal_parse_common_option(int opt, const char *optarg, case OPT_NO_TELEMETRY_NUM: conf->no_telemetry = 1; break; + case OPT_FORCE_MAX_SIMD_BITWIDTH_NUM: + if (eal_parse_simd_bitwidth(optarg, 1) < 0) { + RTE_LOG(ERR, EAL, "invalid parameter for --" + OPT_FORCE_MAX_SIMD_BITWIDTH "\n"); + return -1; + } + break; /* don't know what to do, leave this to caller */ default: @@ -1903,6 +1939,33 @@ eal_check_common_options(struct internal_config *internal_cfg) return 0; } +uint16_t +rte_get_max_simd_bitwidth(void) +{ + const struct internal_config *internal_conf = + eal_get_internal_configuration(); + return internal_conf->max_simd_bitwidth.bitwidth; +} + +int +rte_set_max_simd_bitwidth(uint16_t bitwidth) +{ + struct internal_config *internal_conf = + eal_get_internal_configuration(); + if (internal_conf->max_simd_bitwidth.locked) { + RTE_LOG(NOTICE, EAL, "Cannot set max SIMD bitwidth - user runtime override enabled"); + return -EPERM; + } + + if (bitwidth != RTE_MAX_SIMD_DISABLE && (bitwidth < RTE_NO_SIMD || + !rte_is_power_of_2(bitwidth))) { + RTE_LOG(ERR, EAL, "Invalid bitwidth value!\n"); + return -EINVAL; + } + internal_conf->max_simd_bitwidth.bitwidth = bitwidth; + return 0; +} + void eal_common_usage(void) { @@ -1981,6 +2044,7 @@ eal_common_usage(void) " --"OPT_BASE_VIRTADDR" Base virtual address\n" " --"OPT_TELEMETRY" Enable telemetry support (on by default)\n" " --"OPT_NO_TELEMETRY" Disable telemetry support\n" + " --"OPT_FORCE_MAX_SIMD_BITWIDTH" Force the max SIMD bitwidth\n" "\nEAL options for DEBUG use only:\n" " --"OPT_HUGE_UNLINK" Unlink hugepage files after init\n" " --"OPT_NO_HUGE" Use malloc instead of hugetlbfs\n" diff --git a/lib/librte_eal/common/eal_internal_cfg.h b/lib/librte_eal/common/eal_internal_cfg.h index 13f93388a7..367e0cc19e 100644 --- a/lib/librte_eal/common/eal_internal_cfg.h +++ b/lib/librte_eal/common/eal_internal_cfg.h @@ -33,6 +33,12 @@ struct hugepage_info { int lock_descriptor; /**< file descriptor for hugepage dir */ }; +struct simd_bitwidth { + /**< flag indicating if bitwidth is locked from further modification */ + bool locked; + uint16_t bitwidth; /**< bitwidth value */ +}; + /** * internal configuration */ @@ -85,6 +91,8 @@ struct internal_config { volatile unsigned int init_complete; /**< indicates whether EAL has completed initialization */ unsigned int no_telemetry; /**< true to disable Telemetry */ + /** max simd bitwidth path to use */ + struct simd_bitwidth max_simd_bitwidth; }; void eal_reset_internal_config(struct internal_config *internal_cfg); diff --git a/lib/librte_eal/common/eal_options.h b/lib/librte_eal/common/eal_options.h index 89769d48b4..ef33979664 100644 --- a/lib/librte_eal/common/eal_options.h +++ b/lib/librte_eal/common/eal_options.h @@ -85,6 +85,8 @@ enum { OPT_TELEMETRY_NUM, #define OPT_NO_TELEMETRY "no-telemetry" OPT_NO_TELEMETRY_NUM, +#define OPT_FORCE_MAX_SIMD_BITWIDTH "force-max-simd-bitwidth" + OPT_FORCE_MAX_SIMD_BITWIDTH_NUM, OPT_LONG_MAX_NUM }; diff --git a/lib/librte_eal/include/rte_eal.h b/lib/librte_eal/include/rte_eal.h index ddcf6a2e7a..fb739f3474 100644 --- a/lib/librte_eal/include/rte_eal.h +++ b/lib/librte_eal/include/rte_eal.h @@ -43,6 +43,14 @@ enum rte_proc_type_t { RTE_PROC_INVALID }; +enum rte_max_simd_t { + RTE_NO_SIMD = 64, + RTE_MAX_128_SIMD = 128, + RTE_MAX_256_SIMD = 256, + RTE_MAX_512_SIMD = 512, + RTE_MAX_SIMD_DISABLE = UINT16_MAX, +}; + /** * Get the process type in a multi-process setup * @@ -51,6 +59,31 @@ enum rte_proc_type_t { */ enum rte_proc_type_t rte_eal_process_type(void); +/** + * Get the supported SIMD bitwidth. + * + * @return + * uint16_t bitwidth. + */ +__rte_experimental +uint16_t rte_get_max_simd_bitwidth(void); + +/** + * Set the supported SIMD bitwidth. + * This API should only be called once at initialization, before EAL init. + * + * @param bitwidth + * uint16_t bitwidth. + * @return + * 0 on success. + * @return + * -EINVAL on invalid bitwidth parameter. + * @return + * -EPERM if bitwidth is locked. + */ +__rte_experimental +int rte_set_max_simd_bitwidth(uint16_t bitwidth); + /** * Request iopl privilege for all RPL. * diff --git a/lib/librte_eal/rte_eal_version.map b/lib/librte_eal/rte_eal_version.map index c32461c663..17a7195a3d 100644 --- a/lib/librte_eal/rte_eal_version.map +++ b/lib/librte_eal/rte_eal_version.map @@ -397,6 +397,10 @@ EXPERIMENTAL { rte_service_lcore_may_be_active; rte_thread_register; rte_thread_unregister; + + # added in 20.11 + rte_get_max_simd_bitwidth; + rte_set_max_simd_bitwidth; }; INTERNAL { -- 2.17.1