On 8/26/2016 2:56 PM, Shreyansh Jain wrote: > Signed-off-by: Jan Viktorin <viktorin at rehivetech.com> > Signed-off-by: Shreyansh Jain <shreyansh.jain at nxp.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 332f2a4..a9b6792 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) >
This gives compilation error for mlx5, because the libraries mlx depends defines same macro: .../rte_common.h:338:9: error: 'container_of' macro redefined /usr/include/infiniband/verbs.h:77:9: note: previous definition is here Does it make sense to protect macro with #ifndef container_of ... #endif OR add a dpdk prefix? Regards, ferruh