From mboxrd@z Thu Jan 1 00:00:00 1970 From: Shreyansh Jain Subject: [RFC PATCH 1/6] eal: define container macro Date: Thu, 17 Nov 2016 11:00:00 +0530 Message-ID: <1479360605-20558-2-git-send-email-shreyansh.jain@nxp.com> References: <1479360605-20558-1-git-send-email-shreyansh.jain@nxp.com> Mime-Version: 1.0 Content-Type: text/plain Cc: , Jan Viktorin , Shreyansh Jain To: Return-path: Received: from NAM02-CY1-obe.outbound.protection.outlook.com (mail-cys01nam02on0044.outbound.protection.outlook.com [104.47.37.44]) by dpdk.org (Postfix) with ESMTP id C249C5599 for ; Thu, 17 Nov 2016 06:28:09 +0100 (CET) In-Reply-To: <1479360605-20558-1-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" From: Jan Viktorin Signed-off-by: Jan Viktorin Signed-off-by: Shreyansh Jain --- lib/librte_eal/common/include/rte_common.h | 18 ++++++++++++++++++ 1 file changed, 18 insertions(+) diff --git a/lib/librte_eal/common/include/rte_common.h b/lib/librte_eal/common/include/rte_common.h index db5ac91..8152bd9 100644 --- a/lib/librte_eal/common/include/rte_common.h +++ b/lib/librte_eal/common/include/rte_common.h @@ -331,6 +331,24 @@ 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); + */ +#ifndef container_of +#define container_of(p, type, member) \ + ((type *) (((char *) (p)) - offsetof(type, member))) +#endif + #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