From: Jan Blunck <jblunck@infradead.org>
To: dev@dpdk.org
Cc: shreyansh.jain@nxp.com, david.marchand@6wind.com,
stephen@networkplumber.org,
Jan Viktorin <viktorin@rehivetech.com>
Subject: [dpdk-dev] [PATCH v3 1/9] eal: define container_of macro
Date: Tue, 20 Dec 2016 12:11:47 +0100 [thread overview]
Message-ID: <1482232315-21626-2-git-send-email-jblunck@infradead.org> (raw)
In-Reply-To: <1482232315-21626-1-git-send-email-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 db5ac91..8dda3e2 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)
--
2.7.4
next prev parent reply other threads:[~2016-12-20 11:12 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-12-20 11:11 [dpdk-dev] [PATCH v3 0/9] Decouple ethdev from PCI device Jan Blunck
2016-12-20 11:11 ` Jan Blunck [this message]
2016-12-20 11:11 ` [dpdk-dev] [PATCH v3 2/9] ethdev: Helper to convert to struct rte_pci_device Jan Blunck
2016-12-20 15:38 ` Stephen Hemminger
2016-12-20 11:11 ` [dpdk-dev] [PATCH v3 3/9] drivers: Use ETH_DEV_PCI_DEV() helper Jan Blunck
2016-12-21 9:50 ` Shreyansh Jain
2016-12-21 9:57 ` Shreyansh Jain
2016-12-20 11:11 ` [dpdk-dev] [PATCH v3 4/9] virtio: Don't fill dev_info->driver_name Jan Blunck
2016-12-20 12:17 ` Ferruh Yigit
2016-12-20 12:40 ` Jan Blunck
2016-12-20 12:58 ` Ferruh Yigit
2016-12-20 11:11 ` [dpdk-dev] [PATCH v3 5/9] virtio: Add vtpci_intr_handle() helper to get rte_intr_handle Jan Blunck
2016-12-20 11:11 ` [dpdk-dev] [PATCH v3 6/9] virtio: Don't depend on struct rte_eth_dev's pci_dev Jan Blunck
2016-12-20 11:11 ` [dpdk-dev] [PATCH v3 7/9] ethdev: Move filling of rte_eth_dev_info->pci_dev to dev_infos_get() Jan Blunck
2016-12-20 15:41 ` Stephen Hemminger
2016-12-21 15:35 ` Jan Blunck
2016-12-21 9:54 ` Shreyansh Jain
2016-12-20 11:11 ` [dpdk-dev] [PATCH v3 8/9] ethdev: Decouple interrupt handling from PCI device Jan Blunck
2016-12-20 11:11 ` [dpdk-dev] [PATCH v3 9/9] ethdev: Decouple struct rte_eth_dev from struct rte_pci_device Jan Blunck
2016-12-21 10:00 ` [dpdk-dev] [PATCH v3 0/9] Decouple ethdev from PCI device Shreyansh Jain
2016-12-21 15:12 ` Jan Blunck
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