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From: Andrii Nakryiko <andriin@fb.com>
To: <bpf@vger.kernel.org>, <netdev@vger.kernel.org>, <ast@fb.com>,
	<daniel@iogearbox.net>
Cc: <andrii.nakryiko@gmail.com>, <kernel-team@fb.com>,
	Andrii Nakryiko <andriin@fb.com>
Subject: [PATCH bpf-next 2/3] tools/bpftool: use libbpf's btf__parse() API for parsing BTF from file
Date: Sat, 1 Aug 2020 18:32:18 -0700
Message-ID: <20200802013219.864880-3-andriin@fb.com> (raw)
In-Reply-To: <20200802013219.864880-1-andriin@fb.com>

Use generic libbpf API to parse BTF data from file, instead of re-implementing
it in bpftool.

Signed-off-by: Andrii Nakryiko <andriin@fb.com>
---
 tools/bpf/bpftool/btf.c | 54 +----------------------------------------
 1 file changed, 1 insertion(+), 53 deletions(-)

diff --git a/tools/bpf/bpftool/btf.c b/tools/bpf/bpftool/btf.c
index fc9bc7a23db6..42d1df2c1939 100644
--- a/tools/bpf/bpftool/btf.c
+++ b/tools/bpf/bpftool/btf.c
@@ -422,54 +422,6 @@ static int dump_btf_c(const struct btf *btf,
 	return err;
 }
 
-static struct btf *btf__parse_raw(const char *file)
-{
-	struct btf *btf;
-	struct stat st;
-	__u8 *buf;
-	FILE *f;
-
-	if (stat(file, &st))
-		return NULL;
-
-	f = fopen(file, "rb");
-	if (!f)
-		return NULL;
-
-	buf = malloc(st.st_size);
-	if (!buf) {
-		btf = ERR_PTR(-ENOMEM);
-		goto exit_close;
-	}
-
-	if ((size_t) st.st_size != fread(buf, 1, st.st_size, f)) {
-		btf = ERR_PTR(-EINVAL);
-		goto exit_free;
-	}
-
-	btf = btf__new(buf, st.st_size);
-
-exit_free:
-	free(buf);
-exit_close:
-	fclose(f);
-	return btf;
-}
-
-static bool is_btf_raw(const char *file)
-{
-	__u16 magic = 0;
-	int fd, nb_read;
-
-	fd = open(file, O_RDONLY);
-	if (fd < 0)
-		return false;
-
-	nb_read = read(fd, &magic, sizeof(magic));
-	close(fd);
-	return nb_read == sizeof(magic) && magic == BTF_MAGIC;
-}
-
 static int do_dump(int argc, char **argv)
 {
 	struct btf *btf = NULL;
@@ -547,11 +499,7 @@ static int do_dump(int argc, char **argv)
 		}
 		NEXT_ARG();
 	} else if (is_prefix(src, "file")) {
-		if (is_btf_raw(*argv))
-			btf = btf__parse_raw(*argv);
-		else
-			btf = btf__parse_elf(*argv, NULL);
-
+		btf = btf__parse(*argv, NULL);
 		if (IS_ERR(btf)) {
 			err = -PTR_ERR(btf);
 			btf = NULL;
-- 
2.24.1


  parent reply index

Thread overview: 8+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-08-02  1:32 [PATCH bpf-next 0/3] Add generic and raw BTF parsing APIs to libbpf Andrii Nakryiko
2020-08-02  1:32 ` [PATCH bpf-next 1/3] libbpf: add btf__parse_raw() and generic btf__parse() APIs Andrii Nakryiko
2020-08-02  1:32 ` Andrii Nakryiko [this message]
2020-08-02  1:32 ` [PATCH bpf-next 3/3] tools/resolve_btfids: use libbpf's btf__parse() API Andrii Nakryiko
2020-08-03 14:45 ` [PATCH bpf-next 0/3] Add generic and raw BTF parsing APIs to libbpf Daniel Borkmann
2020-08-06 17:39 ` Arnaldo Carvalho de Melo
2020-08-06 17:49   ` Andrii Nakryiko
2020-08-06 18:01     ` Alexei Starovoitov

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