netdev - [PATCH perf/core 1/5] libbpf: Add bpf_program__set

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Date:   Fri, 22 Apr 2022 12:00:21 +0200
From:   Jiri Olsa <jolsa@...nel.org>
To:     Arnaldo Carvalho de Melo <acme@...nel.org>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Andrii Nakryiko <andrii@...nel.org>
Cc:     linux-perf-users@...r.kernel.org, netdev@...r.kernel.org,
        bpf@...r.kernel.org, Ingo Molnar <mingo@...nel.org>,
        Namhyung Kim <namhyung@...nel.org>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Peter Zijlstra <a.p.zijlstra@...llo.nl>,
        Martin KaFai Lau <kafai@...com>,
        Song Liu <songliubraving@...com>, Yonghong Song <yhs@...com>,
        John Fastabend <john.fastabend@...il.com>,
        Ian Rogers <irogers@...gle.com>
Subject: [PATCH perf/core 1/5] libbpf: Add bpf_program__set_insns function

Adding bpf_program__set_insns that allows to set new
instructions for program.

Also moving bpf_program__attach_kprobe_multi_opts on
the proper name sorted place in map file.

Signed-off-by: Jiri Olsa <jolsa@...nel.org>
---
 tools/lib/bpf/libbpf.c   |  8 ++++++++
 tools/lib/bpf/libbpf.h   | 12 ++++++++++++
 tools/lib/bpf/libbpf.map |  3 ++-
 3 files changed, 22 insertions(+), 1 deletion(-)

diff --git a/tools/lib/bpf/libbpf.c b/tools/lib/bpf/libbpf.c
index 809fe209cdcc..284790d81c1b 100644
--- a/tools/lib/bpf/libbpf.c
+++ b/tools/lib/bpf/libbpf.c
@@ -8457,6 +8457,14 @@ size_t bpf_program__insn_cnt(const struct bpf_program *prog)
 	return prog->insns_cnt;
 }
 
+void bpf_program__set_insns(struct bpf_program *prog,
+			    struct bpf_insn *insns, size_t insns_cnt)
+{
+	free(prog->insns);
+	prog->insns = insns;
+	prog->insns_cnt = insns_cnt;
+}
+
 int bpf_program__set_prep(struct bpf_program *prog, int nr_instances,
 			  bpf_program_prep_t prep)
 {
diff --git a/tools/lib/bpf/libbpf.h b/tools/lib/bpf/libbpf.h
index 05dde85e19a6..b31ad58d335f 100644
--- a/tools/lib/bpf/libbpf.h
+++ b/tools/lib/bpf/libbpf.h
@@ -323,6 +323,18 @@ 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.
+ * @param prog BPF program for which to return instructions
+ * @param insn a pointer to an array of BPF instructions
+ * @param insns_cnt number of `struct bpf_insn`'s that form
+ * specified BPF program
+ */
+LIBBPF_API void bpf_program__set_insns(struct bpf_program *prog,
+				       struct bpf_insn *insns, size_t insns_cnt);
+
 /**
  * @brief **bpf_program__insn_cnt()** returns number of `struct bpf_insn`'s
  * that form specified BPF program.
diff --git a/tools/lib/bpf/libbpf.map b/tools/lib/bpf/libbpf.map
index dd35ee58bfaa..afa10d24ab41 100644
--- a/tools/lib/bpf/libbpf.map
+++ b/tools/lib/bpf/libbpf.map
@@ -444,7 +444,8 @@ LIBBPF_0.8.0 {
 	global:
 		bpf_object__destroy_subskeleton;
 		bpf_object__open_subskeleton;
+		bpf_program__attach_kprobe_multi_opts;
+		bpf_program__set_insns;
 		libbpf_register_prog_handler;
 		libbpf_unregister_prog_handler;
-		bpf_program__attach_kprobe_multi_opts;
 } LIBBPF_0.7.0;
-- 
2.35.1