From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mails.dpdk.org (mails.dpdk.org [217.70.189.124]) by inbox.dpdk.org (Postfix) with ESMTP id 5F19543BA4; Fri, 23 Feb 2024 20:04:33 +0100 (CET) Received: from mails.dpdk.org (localhost [127.0.0.1]) by mails.dpdk.org (Postfix) with ESMTP id 9744C42D26; Fri, 23 Feb 2024 20:04:20 +0100 (CET) Received: from linux.microsoft.com (linux.microsoft.com [13.77.154.182]) by mails.dpdk.org (Postfix) with ESMTP id 40E554027C for ; Fri, 23 Feb 2024 20:04:17 +0100 (CET) Received: by linux.microsoft.com (Postfix, from userid 1086) id 39BA420B74C3; Fri, 23 Feb 2024 11:04:16 -0800 (PST) DKIM-Filter: OpenDKIM Filter v2.11.0 linux.microsoft.com 39BA420B74C3 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.microsoft.com; s=default; t=1708715056; bh=zKJ961EbQTJWoO1uMBuAwGXwfBRHrKgGVNIZifwcPvo=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=omPW3Kke5wlvygUqInptGJr8mF/XABvZE6eITEYDRgb87/xA/OKigTiux2zsUE5Y0 xIor+rb3vq311VZO/YkcDTf8yxnEM7XBuMWEwBlwYbKiC9NQ26qQsnQS9UhAKf+REC QGOB8AF9IQCLRJ0fC8ElchT0U+kUA7AhMyIxGj20= From: Tyler Retzlaff To: dev@dpdk.org Cc: Andrew Rybchenko , Bruce Richardson , Chengwen Feng , Cristian Dumitrescu , David Christensen , David Hunt , Ferruh Yigit , Honnappa Nagarahalli , Jasvinder Singh , Jerin Jacob , Kevin Laatz , Konstantin Ananyev , Min Zhou , Ruifeng Wang , Sameh Gobriel , Stanislaw Kardach , Thomas Monjalon , Vladimir Medvedkin , Yipeng Wang , Tyler Retzlaff Subject: [PATCH v5 03/39] stack: use C11 alignas Date: Fri, 23 Feb 2024 11:03:38 -0800 Message-Id: <1708715054-22386-4-git-send-email-roretzla@linux.microsoft.com> X-Mailer: git-send-email 1.8.3.1 In-Reply-To: <1708715054-22386-1-git-send-email-roretzla@linux.microsoft.com> References: <1707873986-29352-1-git-send-email-roretzla@linux.microsoft.com> <1708715054-22386-1-git-send-email-roretzla@linux.microsoft.com> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-BeenThere: dev@dpdk.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: DPDK patches and discussions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: dev-bounces@dpdk.org The current location used for __rte_aligned(a) for alignment of types and variables is not compatible with MSVC. There is only a single location accepted by both toolchains. For variables standard C11 offers alignas(a) supported by conformant compilers i.e. both MSVC and GCC. For types the standard offers no alignment facility that compatibly interoperates with C and C++ but may be achieved by relocating the placement of __rte_aligned(a) to the aforementioned location accepted by all currently supported toolchains. To allow alignment for both compilers do the following: * Move __rte_aligned from the end of {struct,union} definitions to be between {struct,union} and tag. The placement between {struct,union} and the tag allows the desired alignment to be imparted on the type regardless of the toolchain being used for all of GCC, LLVM, MSVC compilers building both C and C++. * Replace use of __rte_aligned(a) on variables/fields with alignas(a). Signed-off-by: Tyler Retzlaff Acked-by: Morten Brørup --- lib/stack/rte_stack.h | 16 +++++++++------- 1 file changed, 9 insertions(+), 7 deletions(-) diff --git a/lib/stack/rte_stack.h b/lib/stack/rte_stack.h index a379300..8ff0659 100644 --- a/lib/stack/rte_stack.h +++ b/lib/stack/rte_stack.h @@ -15,6 +15,8 @@ #ifndef _RTE_STACK_H_ #define _RTE_STACK_H_ +#include + #ifdef __cplusplus extern "C" { #endif @@ -42,7 +44,7 @@ struct rte_stack_lf_head { struct rte_stack_lf_list { /** List head */ - struct rte_stack_lf_head head __rte_aligned(16); + alignas(16) struct rte_stack_lf_head head; /** List len */ RTE_ATOMIC(uint64_t) len; }; @@ -52,11 +54,11 @@ struct rte_stack_lf_list { */ struct rte_stack_lf { /** LIFO list of elements */ - struct rte_stack_lf_list used __rte_cache_aligned; + alignas(RTE_CACHE_LINE_SIZE) struct rte_stack_lf_list used; /** LIFO list of free elements */ - struct rte_stack_lf_list free __rte_cache_aligned; + alignas(RTE_CACHE_LINE_SIZE) struct rte_stack_lf_list free; /** LIFO elements */ - struct rte_stack_lf_elem elems[] __rte_cache_aligned; + alignas(RTE_CACHE_LINE_SIZE) struct rte_stack_lf_elem elems[]; }; /* Structure containing the LIFO, its current length, and a lock for mutual @@ -71,9 +73,9 @@ struct rte_stack_std { /* The RTE stack structure contains the LIFO structure itself, plus metadata * such as its name and memzone pointer. */ -struct rte_stack { +struct __rte_cache_aligned rte_stack { /** Name of the stack. */ - char name[RTE_STACK_NAMESIZE] __rte_cache_aligned; + alignas(RTE_CACHE_LINE_SIZE) char name[RTE_STACK_NAMESIZE]; /** Memzone containing the rte_stack structure. */ const struct rte_memzone *memzone; uint32_t capacity; /**< Usable size of the stack. */ @@ -82,7 +84,7 @@ struct rte_stack { struct rte_stack_lf stack_lf; /**< Lock-free LIFO structure. */ struct rte_stack_std stack_std; /**< LIFO structure. */ }; -} __rte_cache_aligned; +}; /** * The stack uses lock-free push and pop functions. This flag is only -- 1.8.3.1