From: Jan Viktorin <viktorin@rehivetech.com>
To: dev@dpdk.org
Cc: Jan Viktorin <viktorin@rehivetech.com>
Subject: [dpdk-dev] [RFC 2/6] eal: define macro container_of
Date: Mon, 18 Jan 2016 17:03:03 +0100 [thread overview]
Message-ID: <1453132987-20564-3-git-send-email-viktorin@rehivetech.com> (raw)
In-Reply-To: <1453132987-20564-1-git-send-email-viktorin@rehivetech.com>
Signed-off-by: Jan Viktorin <viktorin@rehivetech.com>
---
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 b58a384..bf6560d 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)
--
2.7.0
next prev parent reply other threads:[~2016-01-18 16:05 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-01-18 16:03 [dpdk-dev] [RFC 0/6] Preview of a big eal/ethdev cleanup Jan Viktorin
2016-01-18 16:03 ` [dpdk-dev] [RFC 1/6] eal: introduce rte_bus_device and rte_bus_driver Jan Viktorin
2016-01-18 16:03 ` Jan Viktorin [this message]
2016-01-18 16:03 ` [dpdk-dev] [RFC 3/6] eal: move devargs from rte_pci_device to rte_device Jan Viktorin
2016-01-18 16:03 ` [dpdk-dev] [RFC 4/6] eal: move numa_node " Jan Viktorin
2016-01-18 16:03 ` [dpdk-dev] [RFC 5/6] eal: move intr_handle " Jan Viktorin
2016-01-18 16:03 ` [dpdk-dev] [RFC 6/6] eal: move driver pointer from rte_pci_device to rte_bus_device Jan Viktorin
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