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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>
This commit is contained in:
Maciej Fijalkowski 2019-02-01 22:42:23 +01:00 committed by Daniel Borkmann
parent 6f20c71d85
commit f3cea32d56
3 changed files with 10 additions and 0 deletions
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6
tools/lib/bpf/libbpf.c
View File

@ -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)
{

3
tools/lib/bpf/libbpf.h
View File

@ -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.

1
tools/lib/bpf/libbpf.map
View File

@ -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;