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libbpf: Add bpf_program__set_insns function

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Adding bpf_program__set_insns that allows to set new instructions
for a BPF program.

This is a very advanced libbpf API and users need to know what
they are doing. This should be used from prog_prepare_load_fn
callback only.

We can have changed instructions after calling prog_prepare_load_fn
callback, reloading them.

One of the users of this new API will be perf's internal BPF prologue
generation.

Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Andrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/bpf/20220510074659.2557731-2-jolsa@kernel.org
This commit is contained in:
Jiri Olsa
2022-05-10 09:46:57 +02:00
committed by Andrii Nakryiko
parent 7062757357
commit e335f3fa5f
3 changed files with 41 additions and 0 deletions
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18
src/libbpf.h
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@@ -323,6 +323,24 @@ struct bpf_insn;
* different.
*/
LIBBPF_API const struct bpf_insn *bpf_program__insns(const struct bpf_program *prog);
/**
* @brief **bpf_program__set_insns()** can set BPF program's underlying
* BPF instructions.
*
* WARNING: This is a very advanced libbpf API and users need to know
* what they are doing. This should be used from prog_prepare_load_fn
* callback only.
*
* @param prog BPF program for which to return instructions
* @param new_insns a pointer to an array of BPF instructions
* @param new_insn_cnt number of `struct bpf_insn`'s that form
* specified BPF program
* @return 0, on success; negative error code, otherwise
*/
LIBBPF_API int bpf_program__set_insns(struct bpf_program *prog,
struct bpf_insn *new_insns, size_t new_insn_cnt);
/**
* @brief **bpf_program__insn_cnt()** returns number of `struct bpf_insn`'s
* that form specified BPF program.