| Message ID | 20200507053935.1545181-1-yhs@fb.com |
|---|---|
| State | Changes Requested |
| Delegated to: | BPF Maintainers |
| Headers | show |
| Series | bpf: implement bpf iterator for kernel data | expand |
On Wed, May 6, 2020 at 10:40 PM Yonghong Song <yhs@fb.com> wrote: > > These two helpers will be used later in bpf_iter bpf program > bpf_iter_netlink.c. Put them in bpf_helpers.h since they could > be useful in other cases. > > Signed-off-by: Yonghong Song <yhs@fb.com> > --- Not sure #ifndef/#endif guards are needed, but won't hurt either. Acked-by: Andrii Nakryiko <andriin@fb.com> > tools/lib/bpf/bpf_helpers.h | 14 ++++++++++++++ > 1 file changed, 14 insertions(+) > [...]
diff --git a/tools/lib/bpf/bpf_helpers.h b/tools/lib/bpf/bpf_helpers.h index da00b87aa199..f67dce2af802 100644 --- a/tools/lib/bpf/bpf_helpers.h +++ b/tools/lib/bpf/bpf_helpers.h @@ -36,6 +36,20 @@ #define __weak __attribute__((weak)) #endif +/* + * Helper macro to manipulate data structures + */ +#ifndef offsetof +#define offsetof(TYPE, MEMBER) ((size_t)&((TYPE *)0)->MEMBER) +#endif +#ifndef container_of +#define container_of(ptr, type, member) \ + ({ \ + void *__mptr = (void *)(ptr); \ + ((type *)(__mptr - offsetof(type, member))); \ + }) +#endif + /* * Helper structure used by eBPF C program * to describe BPF map attributes to libbpf loader
These two helpers will be used later in bpf_iter bpf program bpf_iter_netlink.c. Put them in bpf_helpers.h since they could be useful in other cases. Signed-off-by: Yonghong Song <yhs@fb.com> --- tools/lib/bpf/bpf_helpers.h | 14 ++++++++++++++ 1 file changed, 14 insertions(+)