From: Stephen Hemminger <stephen@networkplumber.org>
To: dev@dpdk.org
Cc: Jan Blunck <jblunck@infradead.org>,
Jan Viktorin <viktorin@rehivetech.com>,
Shreyansh Jain <shreyansh.jain@nxp.com>
Subject: [dpdk-dev] [PATCH 03/13] eal: define container_of macro
Date: Mon, 19 Dec 2016 13:59:34 -0800 [thread overview]
Message-ID: <20161219215944.17226-4-sthemmin@microsoft.com> (raw)
In-Reply-To: <20161219215944.17226-1-sthemmin@microsoft.com>
From: Jan Blunck <jblunck@infradead.org>
This macro is based on Jan Viktorin's original patch but also checks the
type of the passed pointer against the type of the member.
Signed-off-by: Jan Viktorin <viktorin@rehivetech.com>
Signed-off-by: Shreyansh Jain <shreyansh.jain@nxp.com>
[jblunck@infradead.org: add type checking and __extension__]
Signed-off-by: Jan Blunck <jblunck@infradead.org>
---
lib/librte_eal/common/include/rte_common.h | 20 ++++++++++++++++++++
1 file changed, 20 insertions(+)
diff --git a/lib/librte_eal/common/include/rte_common.h b/lib/librte_eal/common/include/rte_common.h
index db5ac91c..8dda3e29 100644
--- a/lib/librte_eal/common/include/rte_common.h
+++ b/lib/librte_eal/common/include/rte_common.h
@@ -331,6 +331,26 @@ 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(ptr, type, member) __extension__ ({ \
+ typeof(((type *)0)->member) *_ptr = (ptr); \
+ (type *)(((char *)_ptr) - 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)
--
2.11.0
next prev parent reply other threads:[~2016-12-19 21:59 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-12-19 21:59 [dpdk-dev] [RFC v2 00/13] Generalize rte_eth_dev model Stephen Hemminger
2016-12-19 21:59 ` [dpdk-dev] [PATCH 01/13] ethdev: increase length ethernet device internal name Stephen Hemminger
2016-12-20 6:53 ` Shreyansh Jain
2016-12-20 17:14 ` Stephen Hemminger
2016-12-19 21:59 ` [dpdk-dev] [PATCH 02/13] rte_device: make driver pointer const Stephen Hemminger
2016-12-20 11:14 ` Jan Blunck
2016-12-19 21:59 ` Stephen Hemminger [this message]
2016-12-19 21:59 ` [dpdk-dev] [PATCH 04/13] eal: introduce driver type Stephen Hemminger
2016-12-20 7:16 ` Shreyansh Jain
2016-12-20 17:16 ` Stephen Hemminger
2016-12-20 13:00 ` Jan Blunck
2016-12-20 17:09 ` Stephen Hemminger
2016-12-20 13:04 ` Ferruh Yigit
2016-12-19 21:59 ` [dpdk-dev] [PATCH 05/13] pmd: remove useless reset of dev_info->dev_pci Stephen Hemminger
2016-12-20 11:16 ` Jan Blunck
2016-12-19 21:59 ` [dpdk-dev] [PATCH 06/13] ethdev: make dev_info generic (not just PCI) Stephen Hemminger
2016-12-20 11:20 ` Jan Blunck
2016-12-19 21:59 ` [dpdk-dev] [PATCH 07/13] e1000: localize mapping from eth_dev to pci Stephen Hemminger
2016-12-19 21:59 ` [dpdk-dev] [PATCH 08/13] ixgbe: localize mapping from eth_dev to pci_device Stephen Hemminger
2016-12-19 21:59 ` [dpdk-dev] [PATCH 09/13] i40e: localize mapping of eth_dev to pci Stephen Hemminger
2016-12-19 21:59 ` [dpdk-dev] [PATCH 10/13] virtio: localize mapping from rte_eth " Stephen Hemminger
2016-12-19 21:59 ` [dpdk-dev] [PATCH 11/13] broadcom: localize mapping from eth_dev " Stephen Hemminger
2016-12-19 21:59 ` [dpdk-dev] [PATCH 12/13] ethdev: change pci_dev to generic device Stephen Hemminger
2016-12-19 21:59 ` [dpdk-dev] [PATCH 13/13] hyperv: VMBUS support infrastucture Stephen Hemminger
2016-12-20 12:48 ` [dpdk-dev] [RFC v2 00/13] Generalize rte_eth_dev model Jan Blunck
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