linux-kernel - [PATCH v2 bpf-next 1/4] libbpf: add btf_has_size() and btf

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Message-Id: <1610921764-7526-2-git-send-email-alan.maguire@oracle.com>
Date:   Sun, 17 Jan 2021 22:16:01 +0000
From:   Alan Maguire <alan.maguire@...cle.com>
To:     ast@...nel.org, daniel@...earbox.net, andrii@...nel.org
Cc:     kafai@...com, songliubraving@...com, yhs@...com,
        john.fastabend@...il.com, kpsingh@...nel.org, morbo@...gle.com,
        shuah@...nel.org, bpf@...r.kernel.org, netdev@...r.kernel.org,
        linux-kselftest@...r.kernel.org, linux-kernel@...r.kernel.org,
        Alan Maguire <alan.maguire@...cle.com>
Subject: [PATCH v2 bpf-next 1/4] libbpf: add btf_has_size() and btf_int() inlines

BTF type data dumping will use them in later patches, and they
are useful generally when handling BTF data.

Signed-off-by: Alan Maguire <alan.maguire@...cle.com>
---
 tools/lib/bpf/btf.h | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

diff --git a/tools/lib/bpf/btf.h b/tools/lib/bpf/btf.h
index 1237bcd..0c48f2e 100644
--- a/tools/lib/bpf/btf.h
+++ b/tools/lib/bpf/btf.h
@@ -294,6 +294,20 @@ static inline bool btf_is_datasec(const struct btf_type *t)
 	return btf_kind(t) == BTF_KIND_DATASEC;
 }
 
+static inline bool btf_has_size(const struct btf_type *t)
+{
+	switch (BTF_INFO_KIND(t->info)) {
+	case BTF_KIND_INT:
+	case BTF_KIND_STRUCT:
+	case BTF_KIND_UNION:
+	case BTF_KIND_ENUM:
+	case BTF_KIND_DATASEC:
+		return true;
+	default:
+		return false;
+	}
+}
+
 static inline __u8 btf_int_encoding(const struct btf_type *t)
 {
 	return BTF_INT_ENCODING(*(__u32 *)(t + 1));
@@ -309,6 +323,11 @@ static inline __u8 btf_int_bits(const struct btf_type *t)
 	return BTF_INT_BITS(*(__u32 *)(t + 1));
 }
 
+static inline __u32 btf_int(const struct btf_type *t)
+{
+	return *(__u32 *)(t + 1);
+}
+
 static inline struct btf_array *btf_array(const struct btf_type *t)
 {
 	return (struct btf_array *)(t + 1);
-- 
1.8.3.1