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From: Andrii Nakryiko <andrii@kernel.org>
To: <bpf@vger.kernel.org>, <netdev@vger.kernel.org>, <ast@fb.com>,
	<daniel@iogearbox.net>
Cc: <andrii@kernel.org>, <kernel-team@fb.com>
Subject: [PATCH bpf-next 2/3] libbpf: add base BTF accessor
Date: Tue, 1 Dec 2020 22:52:42 -0800	[thread overview]
Message-ID: <20201202065244.530571-3-andrii@kernel.org> (raw)
In-Reply-To: <20201202065244.530571-1-andrii@kernel.org>

Add ability to get base BTF. It can be also used to check if BTF is split BTF.

Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
---
 tools/lib/bpf/btf.c      | 5 +++++
 tools/lib/bpf/btf.h      | 1 +
 tools/lib/bpf/libbpf.map | 1 +
 3 files changed, 7 insertions(+)

diff --git a/tools/lib/bpf/btf.c b/tools/lib/bpf/btf.c
index 8ff46cd30ca1..1935e83d309c 100644
--- a/tools/lib/bpf/btf.c
+++ b/tools/lib/bpf/btf.c
@@ -432,6 +432,11 @@ __u32 btf__get_nr_types(const struct btf *btf)
 	return btf->start_id + btf->nr_types - 1;
 }
 
+const struct btf *btf__base_btf(const struct btf *btf)
+{
+	return btf->base_btf;
+}
+
 /* internal helper returning non-const pointer to a type */
 static struct btf_type *btf_type_by_id(struct btf *btf, __u32 type_id)
 {
diff --git a/tools/lib/bpf/btf.h b/tools/lib/bpf/btf.h
index 1093f6fe6800..1237bcd1dd17 100644
--- a/tools/lib/bpf/btf.h
+++ b/tools/lib/bpf/btf.h
@@ -51,6 +51,7 @@ LIBBPF_API __s32 btf__find_by_name(const struct btf *btf,
 LIBBPF_API __s32 btf__find_by_name_kind(const struct btf *btf,
 					const char *type_name, __u32 kind);
 LIBBPF_API __u32 btf__get_nr_types(const struct btf *btf);
+LIBBPF_API const struct btf *btf__base_btf(const struct btf *btf);
 LIBBPF_API const struct btf_type *btf__type_by_id(const struct btf *btf,
 						  __u32 id);
 LIBBPF_API size_t btf__pointer_size(const struct btf *btf);
diff --git a/tools/lib/bpf/libbpf.map b/tools/lib/bpf/libbpf.map
index 29ff4807b909..ed55498c4122 100644
--- a/tools/lib/bpf/libbpf.map
+++ b/tools/lib/bpf/libbpf.map
@@ -340,6 +340,7 @@ LIBBPF_0.2.0 {
 
 LIBBPF_0.3.0 {
 	global:
+		btf__base_btf;
 		btf__parse_elf_split;
 		btf__parse_raw_split;
 		btf__parse_split;
-- 
2.24.1


  parent reply	other threads:[~2020-12-02  6:53 UTC|newest]

Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-12-02  6:52 [PATCH bpf-next 0/3] bpftool: improve split BTF support Andrii Nakryiko
2020-12-02  6:52 ` [PATCH bpf-next 1/3] tools/bpftool: emit name <anon> for anonymous BTFs Andrii Nakryiko
2020-12-02  6:52 ` Andrii Nakryiko [this message]
2020-12-02  6:52 ` [PATCH bpf-next 3/3] tools/bpftool: auto-detect split BTFs in common cases Andrii Nakryiko
2020-12-03 18:31 ` [PATCH bpf-next 0/3] bpftool: improve split BTF support Alexei Starovoitov

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