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| author |   Yonghong Song <yhs@fb.com> | 2020-05-09 10:59:19 -0700 |
|---|---|---|
| committer |   Alexei Starovoitov <ast@kernel.org> | 2020-05-09 17:05:27 -0700 |
| commit | 5fbc220862fc7a53a0455ccd2d96c82141e222d4 (patch) | |
| tree | a163830ff0f8a707eb45743aa95b3947857e0d1f | |
| parent | tools/libbpf: Add bpf_iter support (diff) | |
| download | wireguard-linux-5fbc220862fc7a53a0455ccd2d96c82141e222d4.tar.xz wireguard-linux-5fbc220862fc7a53a0455ccd2d96c82141e222d4.zip | |
tools/libpf: Add offsetof/container_of macro in bpf_helpers.h
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>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Acked-by: Andrii Nakryiko <andriin@fb.com>
Link: https://lore.kernel.org/bpf/20200509175919.2477104-1-yhs@fb.com
| -rw-r--r-- | tools/lib/bpf/bpf_helpers.h | 14 |
1 files changed, 14 insertions, 0 deletions
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 @@ -37,6 +37,20 @@ #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 */ |