From mboxrd@z Thu Jan 1 00:00:00 1970 From: Shreyansh Jain Subject: [PATCH v8 01/25] eal: define macro container_of Date: Fri, 26 Aug 2016 19:26:39 +0530 Message-ID: <1472219823-29486-2-git-send-email-shreyansh.jain@nxp.com> References: <1466510566-9240-1-git-send-email-shreyansh.jain@nxp.com> <1472219823-29486-1-git-send-email-shreyansh.jain@nxp.com> Mime-Version: 1.0 Content-Type: text/plain Cc: , , , , Shreyansh Jain To: Return-path: Received: from NAM02-CY1-obe.outbound.protection.outlook.com (mail-cys01nam02on0071.outbound.protection.outlook.com [104.47.37.71]) by dpdk.org (Postfix) with ESMTP id 135D05937 for ; Fri, 26 Aug 2016 15:57:31 +0200 (CEST) In-Reply-To: <1472219823-29486-1-git-send-email-shreyansh.jain@nxp.com> List-Id: patches and discussions about DPDK List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: dev-bounces@dpdk.org Sender: "dev" Signed-off-by: Jan Viktorin Signed-off-by: Shreyansh Jain --- lib/librte_eal/common/include/rte_common.h | 16 ++++++++++++++++ 1 file changed, 16 insertions(+) diff --git a/lib/librte_eal/common/include/rte_common.h b/lib/librte_eal/common/include/rte_common.h index 332f2a4..a9b6792 100644 --- a/lib/librte_eal/common/include/rte_common.h +++ b/lib/librte_eal/common/include/rte_common.h @@ -322,6 +322,22 @@ rte_bsf32(uint32_t v) #define offsetof(TYPE, MEMBER) __builtin_offsetof (TYPE, MEMBER) #endif +/** + * Return pointer to the wrapping struct instance. + * Example: + * + * struct wrapper { + * ... + * struct child c; + * ... + * }; + * + * struct child *x = obtain(...); + * struct wrapper *w = container_of(x, struct wrapper, c); + */ +#define container_of(p, type, member) \ + ((type *) (((char *) (p)) - offsetof(type, member))) + #define _RTE_STR(x) #x /** Take a macro value and get a string version of it */ #define RTE_STR(x) _RTE_STR(x) -- 2.7.4