From: Jan Blunck <jblunck@infradead.org>
To: dev@dpdk.org
Cc: shreyansh.jain@nxp.com, Jan Viktorin <viktorin@rehivetech.com>
Subject: [dpdk-dev] [PATCH 1/7] eal: define container_of macro
Date: Sun, 20 Nov 2016 11:05:21 +0100 [thread overview]
Message-ID: <1479636327-4166-1-git-send-email-jblunck@infradead.org> (raw)
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 reply other threads:[~2016-11-20 10:07 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-11-20 10:05 Jan Blunck [this message]
2016-11-20 10:05 ` [dpdk-dev] [PATCH 2/7] eal: Helper to convert to struct rte_pci_device Jan Blunck
2016-11-20 15:20 ` David Marchand
2016-11-21 16:57 ` Jan Blunck
2016-11-20 10:05 ` [dpdk-dev] [PATCH 3/7] drivers: Use ETH_DEV_PCI_DEV() helper Jan Blunck
2016-11-20 10:05 ` [dpdk-dev] [PATCH 4/7] virtio: Don't fill dev_info->driver_name Jan Blunck
2016-11-20 15:22 ` David Marchand
2016-11-21 16:34 ` Jan Blunck
2016-11-21 16:49 ` David Marchand
2016-11-21 16:52 ` Jan Blunck
2016-11-20 10:05 ` [dpdk-dev] [PATCH 5/7] virtio: Add vtpci_intr_handle() helper to get rte_intr_handle Jan Blunck
2016-11-20 10:05 ` [dpdk-dev] [PATCH 6/7] virtio: Don't depend on struct rte_eth_dev's pci_dev Jan Blunck
2016-11-20 10:05 ` [dpdk-dev] [PATCH 7/7] ethdev: Move filling of rte_eth_dev_info->pci_dev to dev_infos_get() Jan Blunck
2016-11-20 15:23 ` David Marchand
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=1479636327-4166-1-git-send-email-jblunck@infradead.org \
--to=jblunck@infradead.org \
--cc=dev@dpdk.org \
--cc=shreyansh.jain@nxp.com \
--cc=viktorin@rehivetech.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).