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 9418843B9B; Mon, 4 Mar 2024 18:53:27 +0100 (CET) Received: from mails.dpdk.org (localhost [127.0.0.1]) by mails.dpdk.org (Postfix) with ESMTP id C53C5427E0; Mon, 4 Mar 2024 18:52:59 +0100 (CET) Received: from linux.microsoft.com (linux.microsoft.com [13.77.154.182]) by mails.dpdk.org (Postfix) with ESMTP id AA27F40695 for ; Mon, 4 Mar 2024 18:52:51 +0100 (CET) Received: by linux.microsoft.com (Postfix, from userid 1086) id 4E3DE20B74C5; Mon, 4 Mar 2024 09:52:50 -0800 (PST) DKIM-Filter: OpenDKIM Filter v2.11.0 linux.microsoft.com 4E3DE20B74C5 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.microsoft.com; s=default; t=1709574770; bh=waLp9S8LDY5sxabQBZjrYLI5Iaamv/o8fF3084OtYpU=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=Dem9XLVdBYs3wx8W10SAW1Yk1jAanlqXk80SYZ9EG+2g4Zz7PNfk3Z1z5TvLJ/XTz viuL4V1bAoZHQwoNy2I+gGcrxL2LRG7WR2QpHcgkqrobv7FIUevw1a/k4msG6ylrNR wuOpQmhXUn+artT8ygs8mlexg+9w6kkzeo403KPs= 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 v7 05/39] ring: use C11 alignas Date: Mon, 4 Mar 2024 09:52:10 -0800 Message-Id: <1709574764-9041-6-git-send-email-roretzla@linux.microsoft.com> X-Mailer: git-send-email 1.8.3.1 In-Reply-To: <1709574764-9041-1-git-send-email-roretzla@linux.microsoft.com> References: <1707873986-29352-1-git-send-email-roretzla@linux.microsoft.com> <1709574764-9041-1-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 Acked-by: Konstantin Ananyev --- lib/ring/rte_ring_core.h | 16 +++++++++------- lib/ring/rte_ring_peek_zc.h | 4 ++-- 2 files changed, 11 insertions(+), 9 deletions(-) diff --git a/lib/ring/rte_ring_core.h b/lib/ring/rte_ring_core.h index b770873..f958064 100644 --- a/lib/ring/rte_ring_core.h +++ b/lib/ring/rte_ring_core.h @@ -19,6 +19,8 @@ * instead. */ +#include + #ifdef __cplusplus extern "C" { #endif @@ -78,7 +80,7 @@ struct rte_ring_headtail { union __rte_ring_rts_poscnt { /** raw 8B value to read/write *cnt* and *pos* as one atomic op */ - RTE_ATOMIC(uint64_t) raw __rte_aligned(8); + alignas(sizeof(uint64_t)) RTE_ATOMIC(uint64_t) raw; struct { uint32_t cnt; /**< head/tail reference counter */ uint32_t pos; /**< head/tail position */ @@ -94,7 +96,7 @@ struct rte_ring_rts_headtail { union __rte_ring_hts_pos { /** raw 8B value to read/write *head* and *tail* as one atomic op */ - RTE_ATOMIC(uint64_t) raw __rte_aligned(8); + alignas(sizeof(uint64_t)) RTE_ATOMIC(uint64_t) raw; struct { RTE_ATOMIC(uint32_t) head; /**< head position */ RTE_ATOMIC(uint32_t) tail; /**< tail position */ @@ -117,7 +119,7 @@ struct rte_ring_hts_headtail { * a problem. */ struct rte_ring { - char name[RTE_RING_NAMESIZE] __rte_cache_aligned; + alignas(RTE_CACHE_LINE_SIZE) char name[RTE_RING_NAMESIZE]; /**< Name of the ring. */ int flags; /**< Flags supplied at creation. */ const struct rte_memzone *memzone; @@ -129,20 +131,20 @@ struct rte_ring { RTE_CACHE_GUARD; /** Ring producer status. */ - union { + union __rte_cache_aligned { struct rte_ring_headtail prod; struct rte_ring_hts_headtail hts_prod; struct rte_ring_rts_headtail rts_prod; - } __rte_cache_aligned; + }; RTE_CACHE_GUARD; /** Ring consumer status. */ - union { + union __rte_cache_aligned { struct rte_ring_headtail cons; struct rte_ring_hts_headtail hts_cons; struct rte_ring_rts_headtail rts_cons; - } __rte_cache_aligned; + }; RTE_CACHE_GUARD; }; diff --git a/lib/ring/rte_ring_peek_zc.h b/lib/ring/rte_ring_peek_zc.h index 8fb279c..0b5e34b 100644 --- a/lib/ring/rte_ring_peek_zc.h +++ b/lib/ring/rte_ring_peek_zc.h @@ -79,7 +79,7 @@ * This structure contains the pointers and length of the space * reserved on the ring storage. */ -struct rte_ring_zc_data { +struct __rte_cache_aligned rte_ring_zc_data { /* Pointer to the first space in the ring */ void *ptr1; /* Pointer to the second space in the ring if there is wrap-around. @@ -92,7 +92,7 @@ struct rte_ring_zc_data { * will give the number of elements available at ptr2. */ unsigned int n1; -} __rte_cache_aligned; +}; static __rte_always_inline void __rte_ring_get_elem_addr(struct rte_ring *r, uint32_t head, -- 1.8.3.1