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| author |   Christian Ehrhardt <christian.ehrhardt@canonical.com> | 2017-05-16 14:51:32 +0200 |
|---|---|---|
| committer | Christian Ehrhardt <christian.ehrhardt@canonical.com> | 2017-05-16 14:51:32 +0200 |
| commit | fca143f059a0bddd7d47b8dc2df646a891b0eb0f (patch) | |
| tree | 4bfeadc905c977e45e54a90c42330553b8942e4e /lib/librte_eal/common/include/rte_common.h | |
| parent | ce3d555e43e3795b5d9507fcfc76b7a0a92fd0d6 (diff) | |
Imported Upstream version 17.05
Diffstat (limited to 'lib/librte_eal/common/include/rte_common.h')
| -rw-r--r-- | lib/librte_eal/common/include/rte_common.h | 23 |
1 files changed, 23 insertions, 0 deletions
diff --git a/lib/librte_eal/common/include/rte_common.h b/lib/librte_eal/common/include/rte_common.h index db5ac91c..e057f6e2 100644 --- a/lib/librte_eal/common/include/rte_common.h +++ b/lib/librte_eal/common/include/rte_common.h @@ -331,6 +331,29 @@ 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__ ({ \ + const typeof(((type *)0)->member) *_ptr = (ptr); \ + __attribute__((unused)) type *_target_ptr = \ + (type *)(ptr); \ + (type *)(((uintptr_t)_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) |