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 DDAA843B6A; Mon, 4 Mar 2024 18:57:20 +0100 (CET) Received: from mails.dpdk.org (localhost [127.0.0.1]) by mails.dpdk.org (Postfix) with ESMTP id 9EDF842EC3; Mon, 4 Mar 2024 18:53:36 +0100 (CET) Received: from linux.microsoft.com (linux.microsoft.com [13.77.154.182]) by mails.dpdk.org (Postfix) with ESMTP id 13FD3410ED for ; Mon, 4 Mar 2024 18:52:53 +0100 (CET) Received: by linux.microsoft.com (Postfix, from userid 1086) id B841D20B74DD; Mon, 4 Mar 2024 09:52:50 -0800 (PST) DKIM-Filter: OpenDKIM Filter v2.11.0 linux.microsoft.com B841D20B74DD DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.microsoft.com; s=default; t=1709574771; bh=vwOsZ6LuePygY3eSg5nNeZMaaqrqDyIqhamwBfyqqUo=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=b3qAYCmCCoho1cDPpYnfsfeEkepFJm8/r2NW8YjsMf3y1Y4AVNNX2oxXvgUvxQEJy ltbe5/HPvU+39/C/fEVtBRfme+U66IcBVMqeMBn/R4UgI+z9rRlos7DuAyztswXUl0 uIPnjF96v1s41jpCmFz9CPGZggNmRUvKcuIhVhUQ= 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 29/39] lpm: use C11 alignas Date: Mon, 4 Mar 2024 09:52:34 -0800 Message-Id: <1709574764-9041-30-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 --- lib/lpm/rte_lpm.h | 5 +++-- lib/lpm/rte_lpm6.c | 8 ++++---- 2 files changed, 7 insertions(+), 6 deletions(-) diff --git a/lib/lpm/rte_lpm.h b/lib/lpm/rte_lpm.h index f57977b..f311fd9 100644 --- a/lib/lpm/rte_lpm.h +++ b/lib/lpm/rte_lpm.h @@ -11,6 +11,7 @@ * RTE Longest Prefix Match (LPM) */ +#include #include #include @@ -118,8 +119,8 @@ struct rte_lpm_config { /** @internal LPM structure. */ struct rte_lpm { /* LPM Tables. */ - struct rte_lpm_tbl_entry tbl24[RTE_LPM_TBL24_NUM_ENTRIES] - __rte_cache_aligned; /**< LPM tbl24 table. */ + alignas(RTE_CACHE_LINE_SIZE) struct rte_lpm_tbl_entry tbl24[RTE_LPM_TBL24_NUM_ENTRIES]; + /**< LPM tbl24 table. */ struct rte_lpm_tbl_entry *tbl8; /**< LPM tbl8 table. */ }; diff --git a/lib/lpm/rte_lpm6.c b/lib/lpm/rte_lpm6.c index 271bc48..ed5970c 100644 --- a/lib/lpm/rte_lpm6.c +++ b/lib/lpm/rte_lpm6.c @@ -98,16 +98,16 @@ struct rte_lpm6 { /* LPM Tables. */ struct rte_hash *rules_tbl; /**< LPM rules. */ - struct rte_lpm6_tbl_entry tbl24[RTE_LPM6_TBL24_NUM_ENTRIES] - __rte_cache_aligned; /**< LPM tbl24 table. */ + alignas(RTE_CACHE_LINE_SIZE) struct rte_lpm6_tbl_entry tbl24[RTE_LPM6_TBL24_NUM_ENTRIES]; + /**< LPM tbl24 table. */ uint32_t *tbl8_pool; /**< pool of indexes of free tbl8s */ uint32_t tbl8_pool_pos; /**< current position in the tbl8 pool */ struct rte_lpm_tbl8_hdr *tbl8_hdrs; /* array of tbl8 headers */ - struct rte_lpm6_tbl_entry tbl8[0] - __rte_cache_aligned; /**< LPM tbl8 table. */ + alignas(RTE_CACHE_LINE_SIZE) struct rte_lpm6_tbl_entry tbl8[0]; + /**< LPM tbl8 table. */ }; /* -- 1.8.3.1