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libbpf: Add getter for program size 

This adds a new getter for the BPF program size (in bytes). This is useful
for a caller that is trying to predict how much memory will be locked by
loading a BPF object into the kernel.

Signed-off-by: Toke Høiland-Jørgensen <toke@redhat.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Acked-by: Andrii Nakryiko <andriin@fb.com>
Acked-by: David S. Miller <davem@davemloft.net>
Acked-by: Song Liu <songliubraving@fb.com>
Link: https://lore.kernel.org/bpf/157333185272.88376.10996937115395724683.stgit@toke.dk
This commit is contained in:
Toke Høiland-Jørgensen 2019-11-09 21:37:32 +01:00 committed by Alexei Starovoitov
parent 473f4e133a
commit 1a734efe06
3 changed files with 9 additions and 0 deletions
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5
tools/lib/bpf/libbpf.c
View File

@ -4782,6 +4782,11 @@ int bpf_program__fd(const struct bpf_program *prog)
return bpf_program__nth_fd(prog, 0);
}
size_t bpf_program__size(const struct bpf_program *prog)
{
return prog->insns_cnt * sizeof(struct bpf_insn);
}
int bpf_program__set_prep(struct bpf_program *prog, int nr_instances,
bpf_program_prep_t prep)
{

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

@ -214,6 +214,9 @@ LIBBPF_API void bpf_program__set_ifindex(struct bpf_program *prog,
LIBBPF_API const char *bpf_program__title(const struct bpf_program *prog,
bool needs_copy);
/* returns program size in bytes */
LIBBPF_API size_t bpf_program__size(const struct bpf_program *prog);
LIBBPF_API int bpf_program__load(struct bpf_program *prog, char *license,
__u32 kern_version);
LIBBPF_API int bpf_program__fd(const struct bpf_program *prog);

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

@ -203,4 +203,5 @@ LIBBPF_0.0.6 {
bpf_program__get_type;
bpf_program__is_tracing;
bpf_program__set_tracing;
bpf_program__size;
} LIBBPF_0.0.5;