diff options
| author |   Maciej Fijalkowski <maciejromanfijalkowski@gmail.com> | 2019-02-01 22:42:23 +0100 |
|---|---|---|
| committer |   Daniel Borkmann <daniel@iogearbox.net> | 2019-02-01 23:37:50 +0100 |
| commit | f3cea32d56e96c510af454616104e3979f7626dd (patch) | |
| tree | c533d2064965a7f1071d14b53105e591cbb24867 /tools/lib | |
| parent | bpf: powerpc64: add JIT support for bpf line info (diff) | |
| download | linux-dev-f3cea32d56e96c510af454616104e3979f7626dd.tar.xz linux-dev-f3cea32d56e96c510af454616104e3979f7626dd.zip | |
libbpf: Add a helper for retrieving a map fd for a given name
XDP samples are mostly cooperating with eBPF maps through their file
descriptors. In case of a eBPF program that contains multiple maps it
might be tiresome to iterate through them and call bpf_map__fd for each
one. Add a helper mostly based on bpf_object__find_map_by_name, but
instead of returning the struct bpf_map pointer, return map fd.
Suggested-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Signed-off-by: Maciej Fijalkowski <maciej.fijalkowski@intel.com>
Reviewed-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Acked-by: John Fastabend <john.fastabend@gmail.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Diffstat (limited to 'tools/lib')
| -rw-r--r-- | tools/lib/bpf/libbpf.c | 6 | ||||
| -rw-r--r-- | tools/lib/bpf/libbpf.h | 3 | ||||
| -rw-r--r-- | tools/lib/bpf/libbpf.map | 1 |
3 files changed, 10 insertions, 0 deletions
diff --git a/tools/lib/bpf/libbpf.c b/tools/lib/bpf/libbpf.c index 2ccde17957e6..03bc01ca2577 100644 --- a/tools/lib/bpf/libbpf.c +++ b/tools/lib/bpf/libbpf.c @@ -2884,6 +2884,12 @@ bpf_object__find_map_by_name(struct bpf_object *obj, const char *name) return NULL; } +int +bpf_object__find_map_fd_by_name(struct bpf_object *obj, const char *name) +{ + return bpf_map__fd(bpf_object__find_map_by_name(obj, name)); +} + struct bpf_map * bpf_object__find_map_by_offset(struct bpf_object *obj, size_t offset) { diff --git a/tools/lib/bpf/libbpf.h b/tools/lib/bpf/libbpf.h index 62ae6cb93da1..931be6f3408c 100644 --- a/tools/lib/bpf/libbpf.h +++ b/tools/lib/bpf/libbpf.h @@ -264,6 +264,9 @@ struct bpf_map; LIBBPF_API struct bpf_map * bpf_object__find_map_by_name(struct bpf_object *obj, const char *name); +LIBBPF_API int +bpf_object__find_map_fd_by_name(struct bpf_object *obj, const char *name); + /* * Get bpf_map through the offset of corresponding struct bpf_map_def * in the BPF object file. diff --git a/tools/lib/bpf/libbpf.map b/tools/lib/bpf/libbpf.map index f6f96fc38c50..43ba9bb8d24b 100644 --- a/tools/lib/bpf/libbpf.map +++ b/tools/lib/bpf/libbpf.map @@ -131,4 +131,5 @@ LIBBPF_0.0.2 { bpf_probe_map_type; bpf_probe_prog_type; bpf_map_lookup_elem_flags; + bpf_object__find_map_fd_by_name; } LIBBPF_0.0.1; |