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| author | Wang Nan | 2016-11-26 08:03:27 +0100 |
|---|---|---|
| committer | Arnaldo Carvalho de Melo | 2016-11-29 16:10:19 +0100 |
| commit | 5a6acad17d2e81765dd4c2fce7346a6f045eab25 (patch) | |
| tree | c5ee94f9aec5b8ac2d1b09e7e1b8b28f927a1204 /tools/lib/bpf/libbpf.c | |
| parent | tools lib bpf: Add private field for bpf_object (diff) | |
| download | kernel-qcow2-linux-5a6acad17d2e81765dd4c2fce7346a6f045eab25.tar.gz kernel-qcow2-linux-5a6acad17d2e81765dd4c2fce7346a6f045eab25.tar.xz kernel-qcow2-linux-5a6acad17d2e81765dd4c2fce7346a6f045eab25.zip | |
tools lib bpf: Retrive bpf_map through offset of bpf_map_def
Add a new API to libbpf, caller is able to get bpf_map through the
offset of bpf_map_def to 'maps' section.
The API will be used to help jitted perf hook code find fd of a map.
Signed-off-by: Wang Nan <wangnan0@huawei.com>
Acked-by: Alexei Starovoitov <ast@kernel.org>
Cc: He Kuang <hekuang@huawei.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Joe Stringer <joe@ovn.org>
Cc: Zefan Li <lizefan@huawei.com>
Cc: pi3orama@163.com
Link: http://lkml.kernel.org/r/20161126070354.141764-4-wangnan0@huawei.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Diffstat (limited to 'tools/lib/bpf/libbpf.c')
| -rw-r--r-- | tools/lib/bpf/libbpf.c | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/tools/lib/bpf/libbpf.c b/tools/lib/bpf/libbpf.c index 866d5cdeffc7..2e974593f3e8 100644 --- a/tools/lib/bpf/libbpf.c +++ b/tools/lib/bpf/libbpf.c @@ -1524,3 +1524,15 @@ bpf_object__find_map_by_name(struct bpf_object *obj, const char *name) } return NULL; } + +struct bpf_map * +bpf_object__find_map_by_offset(struct bpf_object *obj, size_t offset) +{ + int i; + + for (i = 0; i < obj->nr_maps; i++) { + if (obj->maps[i].offset == offset) + return &obj->maps[i]; + } + return ERR_PTR(-ENOENT); +} |