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 62E3343B7E; Mon, 26 Feb 2024 19:27:25 +0100 (CET) Received: from mails.dpdk.org (localhost [127.0.0.1]) by mails.dpdk.org (Postfix) with ESMTP id E756242EAE; Mon, 26 Feb 2024 19:26:17 +0100 (CET) Received: from linux.microsoft.com (linux.microsoft.com [13.77.154.182]) by mails.dpdk.org (Postfix) with ESMTP id 26B0842E36 for ; Mon, 26 Feb 2024 19:25:50 +0100 (CET) Received: by linux.microsoft.com (Postfix, from userid 1086) id B3E4A20B74C8; Mon, 26 Feb 2024 10:25:48 -0800 (PST) DKIM-Filter: OpenDKIM Filter v2.11.0 linux.microsoft.com B3E4A20B74C8 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.microsoft.com; s=default; t=1708971948; bh=tkTjFWnx8GSHrYIu6+hi9yDUEuY6s8kUJde+1jJ4sEo=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=UwHbLh82NEscgVUJ9NzYlnJepN40fDOVL2aUFsX0nL5KFG4Le+u8+fP+dk/g9EfT9 y+AXPdJueY93ZYYPkBqT1HvX5APS6+q3tpVLs/A3SADOl260rMIDEAotpFN3KfZ8tq oU/gamDK4JChslH52HhTVMVctNS2N9EdG+3gj+EI= 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 v6 08/39] mbuf: use C11 alignas Date: Mon, 26 Feb 2024 10:25:15 -0800 Message-Id: <1708971946-18231-9-git-send-email-roretzla@linux.microsoft.com> X-Mailer: git-send-email 1.8.3.1 In-Reply-To: <1708971946-18231-1-git-send-email-roretzla@linux.microsoft.com> References: <1707873986-29352-1-git-send-email-roretzla@linux.microsoft.com> <1708971946-18231-1-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/mbuf/rte_mbuf_core.h | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) diff --git a/lib/mbuf/rte_mbuf_core.h b/lib/mbuf/rte_mbuf_core.h index 5688683..917a811 100644 --- a/lib/mbuf/rte_mbuf_core.h +++ b/lib/mbuf/rte_mbuf_core.h @@ -463,7 +463,7 @@ enum { /** * The generic rte_mbuf, containing a packet mbuf. */ -struct rte_mbuf { +struct __rte_cache_aligned rte_mbuf { RTE_MARKER cacheline0; void *buf_addr; /**< Virtual address of segment buffer. */ @@ -476,7 +476,7 @@ struct rte_mbuf { * same mbuf cacheline0 layout for 32-bit and 64-bit. This makes * working on vector drivers easier. */ - rte_iova_t buf_iova __rte_aligned(sizeof(rte_iova_t)); + alignas(sizeof(rte_iova_t)) rte_iova_t buf_iova; #else /** * Next segment of scattered packet. @@ -662,7 +662,7 @@ struct rte_mbuf { uint16_t timesync; uint32_t dynfield1[9]; /**< Reserved for dynamic fields. */ -} __rte_cache_aligned; +}; /** * Function typedef of callback to free externally attached buffer. -- 1.8.3.1