netdev - [PATCH bpf-next 2/6] libbpf: rename btf__get_from_id() as btf__load_from_kernel_by

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Date:   Wed, 14 Jul 2021 15:15:28 +0100
From:   Quentin Monnet <quentin@...valent.com>
To:     Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Andrii Nakryiko <andrii@...nel.org>
Cc:     netdev@...r.kernel.org, bpf@...r.kernel.org,
        Quentin Monnet <quentin@...valent.com>
Subject: [PATCH bpf-next 2/6] libbpf: rename btf__get_from_id() as btf__load_from_kernel_by_id()

Rename function btf__get_from_id() as btf__load_from_kernel_by_id() to
better indicate what the function does.

The other tools calling the deprecated btf__get_from_id() function will
be updated in a future commit.

References:

- https://github.com/libbpf/libbpf/issues/278
- https://github.com/libbpf/libbpf/wiki/Libbpf:-the-road-to-v1.0#btfh-apis

Signed-off-by: Quentin Monnet <quentin@...valent.com>
---
 tools/lib/bpf/btf.c      | 4 +++-
 tools/lib/bpf/btf.h      | 1 +
 tools/lib/bpf/libbpf.c   | 2 +-
 tools/lib/bpf/libbpf.map | 1 +
 4 files changed, 6 insertions(+), 2 deletions(-)

diff --git a/tools/lib/bpf/btf.c b/tools/lib/bpf/btf.c
index 7e0de560490e..05b63b63083a 100644
--- a/tools/lib/bpf/btf.c
+++ b/tools/lib/bpf/btf.c
@@ -1383,7 +1383,7 @@ struct btf *btf_get_from_fd(int btf_fd, struct btf *base_btf)
 	return btf;
 }
 
-int btf__get_from_id(__u32 id, struct btf **btf)
+int btf__load_from_kernel_by_id(__u32 id, struct btf **btf)
 {
 	struct btf *res;
 	int err, btf_fd;
@@ -1404,6 +1404,8 @@ int btf__get_from_id(__u32 id, struct btf **btf)
 	*btf = res;
 	return 0;
 }
+int btf__get_from_id(__u32, struct btf **)
+	__attribute__((alias("btf__load_from_kernel_by_id")));
 
 int btf__get_map_kv_tids(const struct btf *btf, const char *map_name,
 			 __u32 expected_key_size, __u32 expected_value_size,
diff --git a/tools/lib/bpf/btf.h b/tools/lib/bpf/btf.h
index b36f1b2805dc..0bd9d3952d19 100644
--- a/tools/lib/bpf/btf.h
+++ b/tools/lib/bpf/btf.h
@@ -68,6 +68,7 @@ LIBBPF_API const void *btf__get_raw_data(const struct btf *btf, __u32 *size);
 LIBBPF_API const char *btf__name_by_offset(const struct btf *btf, __u32 offset);
 LIBBPF_API const char *btf__str_by_offset(const struct btf *btf, __u32 offset);
 LIBBPF_API int btf__get_from_id(__u32 id, struct btf **btf);
+LIBBPF_API int btf__load_from_kernel_by_id(__u32 id, struct btf **btf);
 LIBBPF_API int btf__get_map_kv_tids(const struct btf *btf, const char *map_name,
 				    __u32 expected_key_size,
 				    __u32 expected_value_size,
diff --git a/tools/lib/bpf/libbpf.c b/tools/lib/bpf/libbpf.c
index d8b7c7750402..e54fa1e57d48 100644
--- a/tools/lib/bpf/libbpf.c
+++ b/tools/lib/bpf/libbpf.c
@@ -9571,7 +9571,7 @@ static int libbpf_find_prog_btf_id(const char *name, __u32 attach_prog_fd)
 		pr_warn("The target program doesn't have BTF\n");
 		goto out;
 	}
-	if (btf__get_from_id(info->btf_id, &btf)) {
+	if (btf__load_from_kernel_by_id(info->btf_id, &btf)) {
 		pr_warn("Failed to get BTF of the program\n");
 		goto out;
 	}
diff --git a/tools/lib/bpf/libbpf.map b/tools/lib/bpf/libbpf.map
index d42f20b0e9e4..a687cc63cd80 100644
--- a/tools/lib/bpf/libbpf.map
+++ b/tools/lib/bpf/libbpf.map
@@ -378,5 +378,6 @@ LIBBPF_0.5.0 {
 
 LIBBPF_0.6.0 {
 	global:
+		btf__load_from_kernel_by_id;
 		btf__load_into_kernel;
 } LIBBPF_0.5.0;
-- 
2.30.2