netdev - [PATCH v4 bpf-next 2/4] btf: expose API to work with raw btf data

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Message-ID: <20190208191939.3105592-3-andriin@fb.com>
Date:   Fri, 8 Feb 2019 11:19:37 -0800
From:   Andrii Nakryiko <andriin@...com>
To:     <alexei.starovoitov@...il.com>, <andrii.nakryiko@...il.com>,
        <songliubraving@...com>, <yhs@...com>, <ast@...com>,
        <kafai@...com>, <netdev@...r.kernel.org>, <kernel-team@...com>,
        <daniel@...earbox.net>, <acme@...nel.org>
CC:     Andrii Nakryiko <andriin@...com>
Subject: [PATCH v4 bpf-next 2/4] btf: expose API to work with raw btf data

This patch exposes new API btf__get_raw_data() that allows to get a copy
of raw BTF data out of struct btf. This is useful for external programs
that need to manipulate raw data, e.g., pahole using btf__dedup() to
deduplicate BTF type info and then writing it back to file.

Signed-off-by: Andrii Nakryiko <andriin@...com>
Acked-by: Song Liu <songliubraving@...com>
---
 tools/lib/bpf/btf.c      | 6 ++++++
 tools/lib/bpf/btf.h      | 1 +
 tools/lib/bpf/libbpf.map | 1 +
 3 files changed, 8 insertions(+)

diff --git a/tools/lib/bpf/btf.c b/tools/lib/bpf/btf.c
index 96674057224d..1216b93eed03 100644
--- a/tools/lib/bpf/btf.c
+++ b/tools/lib/bpf/btf.c
@@ -438,6 +438,12 @@ int btf__fd(const struct btf *btf)
 	return btf->fd;
 }
 
+const void *btf__get_raw_data(const struct btf *btf, __u32 *size)
+{
+	*size = btf->data_size;
+	return btf->data;
+}
+
 void btf__get_strings(const struct btf *btf, const char **strings,
 		      __u32 *str_len)
 {
diff --git a/tools/lib/bpf/btf.h b/tools/lib/bpf/btf.h
index f55b7bc98d9e..10fe412461fe 100644
--- a/tools/lib/bpf/btf.h
+++ b/tools/lib/bpf/btf.h
@@ -66,6 +66,7 @@ LIBBPF_API const struct btf_type *btf__type_by_id(const struct btf *btf,
 LIBBPF_API __s64 btf__resolve_size(const struct btf *btf, __u32 type_id);
 LIBBPF_API int btf__resolve_type(const struct btf *btf, __u32 type_id);
 LIBBPF_API int btf__fd(const struct btf *btf);
+LIBBPF_API const void *btf__get_raw_data(const struct btf *btf, __u32 *size);
 LIBBPF_API void btf__get_strings(const struct btf *btf, const char **strings,
 				 __u32 *str_len);
 LIBBPF_API const char *btf__name_by_offset(const struct btf *btf, __u32 offset);
diff --git a/tools/lib/bpf/libbpf.map b/tools/lib/bpf/libbpf.map
index f5372df143f4..9e10467f8cbb 100644
--- a/tools/lib/bpf/libbpf.map
+++ b/tools/lib/bpf/libbpf.map
@@ -136,6 +136,7 @@ LIBBPF_0.0.2 {
 		btf__dedup;
 		btf__get_map_kv_tids;
 		btf__get_nr_types;
+		btf__get_raw_data;
 		btf__get_strings;
 		btf__load;
 		btf_ext__free;
-- 
2.17.1