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 15DEB43B9B; Mon, 4 Mar 2024 18:55:14 +0100 (CET) Received: from mails.dpdk.org (localhost [127.0.0.1]) by mails.dpdk.org (Postfix) with ESMTP id 5ABFC42E60; Mon, 4 Mar 2024 18:53:17 +0100 (CET) Received: from linux.microsoft.com (linux.microsoft.com [13.77.154.182]) by mails.dpdk.org (Postfix) with ESMTP id 9DE1340ED8 for ; Mon, 4 Mar 2024 18:52:52 +0100 (CET) Received: by linux.microsoft.com (Postfix, from userid 1086) id 9BE2A20B74DB; Mon, 4 Mar 2024 09:52:50 -0800 (PST) DKIM-Filter: OpenDKIM Filter v2.11.0 linux.microsoft.com 9BE2A20B74DB DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.microsoft.com; s=default; t=1709574771; bh=oo7QSt1N4Pog9OQNZoosMwn7lH156+gLB/d9qehW90U=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=gdLrHMIGiDXAMJ+KqIVbnXQsNczpvILYvwyfw3Li/v5mWKT6FEJ0/9SnGBY5OMZY0 1zVFDVefWY0k16P4rG8mkZxypbDaLrtdGa9/LUKYVfnynOU2dJEt897s/8Q+PhSg7k wcFCf3qtXxcsK9nT+mV3AQjLX/8oFO63mJ+yAb5s= 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 27/39] mempool: use C11 alignas Date: Mon, 4 Mar 2024 09:52:32 -0800 Message-Id: <1709574764-9041-28-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/mempool/rte_mempool.h | 27 ++++++++++++++------------- 1 file changed, 14 insertions(+), 13 deletions(-) diff --git a/lib/mempool/rte_mempool.h b/lib/mempool/rte_mempool.h index 6fa4d48..23fd5c8 100644 --- a/lib/mempool/rte_mempool.h +++ b/lib/mempool/rte_mempool.h @@ -34,6 +34,7 @@ * user cache created with rte_mempool_cache_create(). */ +#include #include #include #include @@ -66,7 +67,7 @@ * captured since they can be calculated from other stats. * For example: put_cache_objs = put_objs - put_common_pool_objs. */ -struct rte_mempool_debug_stats { +struct __rte_cache_aligned rte_mempool_debug_stats { uint64_t put_bulk; /**< Number of puts. */ uint64_t put_objs; /**< Number of objects successfully put. */ uint64_t put_common_pool_bulk; /**< Number of bulks enqueued in common pool. */ @@ -80,13 +81,13 @@ struct rte_mempool_debug_stats { uint64_t get_success_blks; /**< Successful allocation number of contiguous blocks. */ uint64_t get_fail_blks; /**< Failed allocation number of contiguous blocks. */ RTE_CACHE_GUARD; -} __rte_cache_aligned; +}; #endif /** * A structure that stores a per-core object cache. */ -struct rte_mempool_cache { +struct __rte_cache_aligned rte_mempool_cache { uint32_t size; /**< Size of the cache */ uint32_t flushthresh; /**< Threshold before we flush excess elements */ uint32_t len; /**< Current cache count */ @@ -109,8 +110,8 @@ struct rte_mempool_cache { * Cache is allocated to this size to allow it to overflow in certain * cases to avoid needless emptying of cache. */ - void *objs[RTE_MEMPOOL_CACHE_MAX_SIZE * 2] __rte_cache_aligned; -} __rte_cache_aligned; + alignas(RTE_CACHE_LINE_SIZE) void *objs[RTE_MEMPOOL_CACHE_MAX_SIZE * 2]; +}; /** * A structure that stores the size of mempool elements. @@ -218,15 +219,15 @@ struct rte_mempool_memhdr { * The structure is cache-line aligned to avoid ABI breakages in * a number of cases when something small is added. */ -struct rte_mempool_info { +struct __rte_cache_aligned rte_mempool_info { /** Number of objects in the contiguous block */ unsigned int contig_block_size; -} __rte_cache_aligned; +}; /** * The RTE mempool structure. */ -struct rte_mempool { +struct __rte_cache_aligned rte_mempool { char name[RTE_MEMPOOL_NAMESIZE]; /**< Name of mempool. */ union { void *pool_data; /**< Ring or pool to store objects. */ @@ -268,7 +269,7 @@ struct rte_mempool { */ struct rte_mempool_debug_stats stats[RTE_MAX_LCORE + 1]; #endif -} __rte_cache_aligned; +}; /** Spreading among memory channels not required. */ #define RTE_MEMPOOL_F_NO_SPREAD 0x0001 @@ -688,7 +689,7 @@ typedef int (*rte_mempool_get_info_t)(const struct rte_mempool *mp, /** Structure defining mempool operations structure */ -struct rte_mempool_ops { +struct __rte_cache_aligned rte_mempool_ops { char name[RTE_MEMPOOL_OPS_NAMESIZE]; /**< Name of mempool ops struct. */ rte_mempool_alloc_t alloc; /**< Allocate private data. */ rte_mempool_free_t free; /**< Free the external pool. */ @@ -713,7 +714,7 @@ struct rte_mempool_ops { * Dequeue a number of contiguous object blocks. */ rte_mempool_dequeue_contig_blocks_t dequeue_contig_blocks; -} __rte_cache_aligned; +}; #define RTE_MEMPOOL_MAX_OPS_IDX 16 /**< Max registered ops structs */ @@ -726,14 +727,14 @@ struct rte_mempool_ops { * any function pointers stored directly in the mempool struct would not be. * This results in us simply having "ops_index" in the mempool struct. */ -struct rte_mempool_ops_table { +struct __rte_cache_aligned rte_mempool_ops_table { rte_spinlock_t sl; /**< Spinlock for add/delete. */ uint32_t num_ops; /**< Number of used ops structs in the table. */ /** * Storage for all possible ops structs. */ struct rte_mempool_ops ops[RTE_MEMPOOL_MAX_OPS_IDX]; -} __rte_cache_aligned; +}; /** Array of registered ops structs. */ extern struct rte_mempool_ops_table rte_mempool_ops_table; -- 1.8.3.1