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From: Andrii Nakryiko <andriin@fb.com>
To: <andrii.nakryiko@gmail.com>, <ast@fb.com>, <daniel@iogearbox.net>,
	<netdev@vger.kernel.org>, <bpf@vger.kernel.org>,
	<kernel-team@fb.com>
Cc: Andrii Nakryiko <andriin@fb.com>
Subject: [PATCH v2 bpf-next 02/11] libbpf: extract BTF loading logic
Date: Mon, 17 Jun 2019 12:26:51 -0700	[thread overview]
Message-ID: <20190617192700.2313445-3-andriin@fb.com> (raw)
In-Reply-To: <20190617192700.2313445-1-andriin@fb.com>

As a preparetion fro adding BTF-based BPF map loading, extract .BTF and
.BTF.ext loading logic.

Signed-off-by: Andrii Nakryiko <andriin@fb.com>
---
 tools/lib/bpf/libbpf.c | 93 +++++++++++++++++++++++++-----------------
 1 file changed, 55 insertions(+), 38 deletions(-)

diff --git a/tools/lib/bpf/libbpf.c b/tools/lib/bpf/libbpf.c
index e725fa86b189..49d3a808e754 100644
--- a/tools/lib/bpf/libbpf.c
+++ b/tools/lib/bpf/libbpf.c
@@ -1078,6 +1078,58 @@ static void bpf_object__sanitize_btf_ext(struct bpf_object *obj)
 	}
 }
 
+static int bpf_object__load_btf(struct bpf_object *obj,
+				Elf_Data *btf_data,
+				Elf_Data *btf_ext_data)
+{
+	int err = 0;
+
+	if (btf_data) {
+		obj->btf = btf__new(btf_data->d_buf, btf_data->d_size);
+		if (IS_ERR(obj->btf)) {
+			pr_warning("Error loading ELF section %s: %d.\n",
+				   BTF_ELF_SEC, err);
+			goto out;
+		}
+		err = btf__finalize_data(obj, obj->btf);
+		if (err) {
+			pr_warning("Error finalizing %s: %d.\n",
+				   BTF_ELF_SEC, err);
+			goto out;
+		}
+		bpf_object__sanitize_btf(obj);
+		err = btf__load(obj->btf);
+		if (err) {
+			pr_warning("Error loading %s into kernel: %d.\n",
+				   BTF_ELF_SEC, err);
+			goto out;
+		}
+	}
+	if (btf_ext_data) {
+		if (!obj->btf) {
+			pr_debug("Ignore ELF section %s because its depending ELF section %s is not found.\n",
+				 BTF_EXT_ELF_SEC, BTF_ELF_SEC);
+			goto out;
+		}
+		obj->btf_ext = btf_ext__new(btf_ext_data->d_buf,
+					    btf_ext_data->d_size);
+		if (IS_ERR(obj->btf_ext)) {
+			pr_warning("Error loading ELF section %s: %ld. Ignored and continue.\n",
+				   BTF_EXT_ELF_SEC, PTR_ERR(obj->btf_ext));
+			obj->btf_ext = NULL;
+			goto out;
+		}
+		bpf_object__sanitize_btf_ext(obj);
+	}
+out:
+	if (err || IS_ERR(obj->btf)) {
+		if (!IS_ERR_OR_NULL(obj->btf))
+			btf__free(obj->btf);
+		obj->btf = NULL;
+	}
+	return 0;
+}
+
 static int bpf_object__elf_collect(struct bpf_object *obj, int flags)
 {
 	Elf *elf = obj->efile.elf;
@@ -1212,44 +1264,9 @@ static int bpf_object__elf_collect(struct bpf_object *obj, int flags)
 		pr_warning("Corrupted ELF file: index of strtab invalid\n");
 		return -LIBBPF_ERRNO__FORMAT;
 	}
-	if (btf_data) {
-		obj->btf = btf__new(btf_data->d_buf, btf_data->d_size);
-		if (IS_ERR(obj->btf)) {
-			pr_warning("Error loading ELF section %s: %ld. Ignored and continue.\n",
-				   BTF_ELF_SEC, PTR_ERR(obj->btf));
-			obj->btf = NULL;
-		} else {
-			err = btf__finalize_data(obj, obj->btf);
-			if (!err) {
-				bpf_object__sanitize_btf(obj);
-				err = btf__load(obj->btf);
-			}
-			if (err) {
-				pr_warning("Error finalizing and loading %s into kernel: %d. Ignored and continue.\n",
-					   BTF_ELF_SEC, err);
-				btf__free(obj->btf);
-				obj->btf = NULL;
-				err = 0;
-			}
-		}
-	}
-	if (btf_ext_data) {
-		if (!obj->btf) {
-			pr_debug("Ignore ELF section %s because its depending ELF section %s is not found.\n",
-				 BTF_EXT_ELF_SEC, BTF_ELF_SEC);
-		} else {
-			obj->btf_ext = btf_ext__new(btf_ext_data->d_buf,
-						    btf_ext_data->d_size);
-			if (IS_ERR(obj->btf_ext)) {
-				pr_warning("Error loading ELF section %s: %ld. Ignored and continue.\n",
-					   BTF_EXT_ELF_SEC,
-					   PTR_ERR(obj->btf_ext));
-				obj->btf_ext = NULL;
-			} else {
-				bpf_object__sanitize_btf_ext(obj);
-			}
-		}
-	}
+	err = bpf_object__load_btf(obj, btf_data, btf_ext_data);
+	if (err)
+		return err;
 	if (bpf_object__has_maps(obj)) {
 		err = bpf_object__init_maps(obj, flags);
 		if (err)
-- 
2.17.1


  parent reply	other threads:[~2019-06-17 19:27 UTC|newest]

Thread overview: 29+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-06-17 19:26 [PATCH v2 bpf-next 00/11] BTF-defined BPF map definitions Andrii Nakryiko
2019-06-17 19:26 ` [PATCH v2 bpf-next 01/11] libbpf: add common min/max macro to libbpf_internal.h Andrii Nakryiko
2019-06-17 19:26 ` Andrii Nakryiko [this message]
2019-06-17 19:40   ` [PATCH v2 bpf-next 02/11] libbpf: extract BTF loading logic Song Liu
2019-06-17 19:26 ` [PATCH v2 bpf-next 03/11] libbpf: streamline ELF parsing error-handling Andrii Nakryiko
2019-06-17 19:46   ` Song Liu
2019-06-17 19:26 ` [PATCH v2 bpf-next 04/11] libbpf: refactor map initialization Andrii Nakryiko
2019-06-17 19:39   ` Song Liu
2019-06-26 14:48   ` Matt Hart
2019-06-26 18:28     ` Andrii Nakryiko
2019-06-27 15:11       ` Matt Hart
2019-06-17 19:26 ` [PATCH v2 bpf-next 05/11] libbpf: identify maps by section index in addition to offset Andrii Nakryiko
2019-06-17 19:26 ` [PATCH v2 bpf-next 06/11] libbpf: split initialization and loading of BTF Andrii Nakryiko
2019-06-17 19:26 ` [PATCH v2 bpf-next 07/11] libbpf: allow specifying map definitions using BTF Andrii Nakryiko
2019-06-17 19:43   ` Song Liu
2019-06-17 19:26 ` [PATCH v2 bpf-next 08/11] selftests/bpf: add test for BTF-defined maps Andrii Nakryiko
2019-06-17 19:26 ` [PATCH v2 bpf-next 09/11] selftests/bpf: switch BPF_ANNOTATE_KV_PAIR tests to " Andrii Nakryiko
2019-06-17 21:41   ` Song Liu
2019-06-17 22:20     ` Daniel Borkmann
2019-06-17 19:26 ` [PATCH v2 bpf-next 10/11] selftests/bpf: convert tests w/ custom values " Andrii Nakryiko
2019-06-17 19:27 ` [PATCH v2 bpf-next 11/11] selftests/bpf: convert remaining selftests " Andrii Nakryiko
2019-06-17 21:17 ` [PATCH v2 bpf-next 00/11] BTF-defined BPF map definitions Daniel Borkmann
2019-06-17 22:17   ` Daniel Borkmann
2019-06-18 21:37   ` Andrii Nakryiko
2019-06-20 14:49     ` Lorenz Bauer
2019-06-21  4:19       ` Andrii Nakryiko
2019-06-21 10:29         ` Lorenz Bauer
2019-06-21 17:56           ` Andrii Nakryiko
2019-06-25 18:14             ` Andrii Nakryiko

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