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Message-Id: <20251104134033.344807-8-dolinux.peng@gmail.com>
Date: Tue, 4 Nov 2025 21:40:33 +0800
From: Donglin Peng <dolinux.peng@...il.com>
To: ast@...nel.org
Cc: linux-kernel@...r.kernel.org,
bpf@...r.kernel.org,
Donglin Peng <dolinux.peng@...il.com>,
Eduard Zingerman <eddyz87@...il.com>,
Andrii Nakryiko <andrii.nakryiko@...il.com>,
Alan Maguire <alan.maguire@...cle.com>,
Song Liu <song@...nel.org>,
pengdonglin <pengdonglin@...omi.com>
Subject: [RFC PATCH v4 7/7] selftests/bpf: Add test cases for btf__permute functionality
From: pengdonglin <pengdonglin@...omi.com>
This patch introduces test cases for the btf__permute function to ensure
it works correctly with both base BTF and split BTF scenarios.
The test suite includes:
- test_permute_base: Validates permutation on standalone BTF
- test_permute_split: Tests permutation on split BTF with base dependencies
Each test verifies that type IDs are correctly rearranged and type
references are properly updated after permutation operations.
Cc: Eduard Zingerman <eddyz87@...il.com>
Cc: Alexei Starovoitov <ast@...nel.org>
Cc: Andrii Nakryiko <andrii.nakryiko@...il.com>
Cc: Alan Maguire <alan.maguire@...cle.com>
Cc: Song Liu <song@...nel.org>
Signed-off-by: pengdonglin <pengdonglin@...omi.com>
Signed-off-by: Donglin Peng <dolinux.peng@...il.com>
---
.../selftests/bpf/prog_tests/btf_permute.c | 142 ++++++++++++++++++
1 file changed, 142 insertions(+)
create mode 100644 tools/testing/selftests/bpf/prog_tests/btf_permute.c
diff --git a/tools/testing/selftests/bpf/prog_tests/btf_permute.c b/tools/testing/selftests/bpf/prog_tests/btf_permute.c
new file mode 100644
index 000000000000..2692cef627ab
--- /dev/null
+++ b/tools/testing/selftests/bpf/prog_tests/btf_permute.c
@@ -0,0 +1,142 @@
+// SPDX-License-Identifier: GPL-2.0
+/* Copyright (c) 2025 Xiaomi */
+
+#include <test_progs.h>
+#include <bpf/btf.h>
+#include "btf_helpers.h"
+
+/* ensure btf__permute work as expected with base_btf */
+static void test_permute_base(void)
+{
+ struct btf *btf;
+ __u32 permute_ids[6];
+ int err;
+
+ btf = btf__new_empty();
+ if (!ASSERT_OK_PTR(btf, "empty_main_btf"))
+ return;
+
+ btf__add_int(btf, "int", 4, BTF_INT_SIGNED); /* [1] int */
+ btf__add_ptr(btf, 1); /* [2] ptr to int */
+ btf__add_struct(btf, "s1", 4); /* [3] struct s1 { */
+ btf__add_field(btf, "m", 1, 0, 0); /* int m; */
+ /* } */
+ btf__add_struct(btf, "s2", 4); /* [4] struct s2 { */
+ btf__add_field(btf, "m", 1, 0, 0); /* int m; */
+ /* } */
+ btf__add_func_proto(btf, 1); /* [5] int (*)(int *p); */
+ btf__add_func_param(btf, "p", 2);
+ btf__add_func(btf, "f", BTF_FUNC_STATIC, 5); /* [6] int f(int *p); */
+
+ VALIDATE_RAW_BTF(
+ btf,
+ "[1] INT 'int' size=4 bits_offset=0 nr_bits=32 encoding=SIGNED",
+ "[2] PTR '(anon)' type_id=1",
+ "[3] STRUCT 's1' size=4 vlen=1\n"
+ "\t'm' type_id=1 bits_offset=0",
+ "[4] STRUCT 's2' size=4 vlen=1\n"
+ "\t'm' type_id=1 bits_offset=0",
+ "[5] FUNC_PROTO '(anon)' ret_type_id=1 vlen=1\n"
+ "\t'p' type_id=2",
+ "[6] FUNC 'f' type_id=5 linkage=static");
+
+ permute_ids[0] = 4; /* struct s2 */
+ permute_ids[1] = 3; /* struct s1 */
+ permute_ids[2] = 5; /* int (*)(int *p) */
+ permute_ids[3] = 1; /* int */
+ permute_ids[4] = 6; /* int f(int *p) */
+ permute_ids[5] = 2; /* ptr to int */
+ err = btf__permute(btf, permute_ids, NULL);
+ if (!ASSERT_OK(err, "btf__permute"))
+ goto done;
+
+ VALIDATE_RAW_BTF(
+ btf,
+ "[1] STRUCT 's2' size=4 vlen=1\n"
+ "\t'm' type_id=4 bits_offset=0",
+ "[2] STRUCT 's1' size=4 vlen=1\n"
+ "\t'm' type_id=4 bits_offset=0",
+ "[3] FUNC_PROTO '(anon)' ret_type_id=4 vlen=1\n"
+ "\t'p' type_id=6",
+ "[4] INT 'int' size=4 bits_offset=0 nr_bits=32 encoding=SIGNED",
+ "[5] FUNC 'f' type_id=3 linkage=static",
+ "[6] PTR '(anon)' type_id=4");
+
+done:
+ btf__free(btf);
+}
+
+/* ensure btf__permute work as expected with split_btf */
+static void test_permute_split(void)
+{
+ struct btf *split_btf = NULL, *base_btf = NULL;
+ __u32 permute_ids[4];
+ int err;
+
+ base_btf = btf__new_empty();
+ if (!ASSERT_OK_PTR(base_btf, "empty_main_btf"))
+ return;
+
+ btf__add_int(base_btf, "int", 4, BTF_INT_SIGNED); /* [1] int */
+ btf__add_ptr(base_btf, 1); /* [2] ptr to int */
+ VALIDATE_RAW_BTF(
+ base_btf,
+ "[1] INT 'int' size=4 bits_offset=0 nr_bits=32 encoding=SIGNED",
+ "[2] PTR '(anon)' type_id=1");
+ split_btf = btf__new_empty_split(base_btf);
+ if (!ASSERT_OK_PTR(split_btf, "empty_split_btf"))
+ goto cleanup;
+ btf__add_struct(split_btf, "s1", 4); /* [3] struct s1 { */
+ btf__add_field(split_btf, "m", 1, 0, 0); /* int m; */
+ /* } */
+ btf__add_struct(split_btf, "s2", 4); /* [4] struct s2 { */
+ btf__add_field(split_btf, "m", 1, 0, 0); /* int m; */
+ /* } */
+ btf__add_func_proto(split_btf, 1); /* [5] int (*)(int p); */
+ btf__add_func_param(split_btf, "p", 2);
+ btf__add_func(split_btf, "f", BTF_FUNC_STATIC, 5); /* [6] int f(int *p); */
+
+ VALIDATE_RAW_BTF(
+ split_btf,
+ "[1] INT 'int' size=4 bits_offset=0 nr_bits=32 encoding=SIGNED",
+ "[2] PTR '(anon)' type_id=1",
+ "[3] STRUCT 's1' size=4 vlen=1\n"
+ "\t'm' type_id=1 bits_offset=0",
+ "[4] STRUCT 's2' size=4 vlen=1\n"
+ "\t'm' type_id=1 bits_offset=0",
+ "[5] FUNC_PROTO '(anon)' ret_type_id=1 vlen=1\n"
+ "\t'p' type_id=2",
+ "[6] FUNC 'f' type_id=5 linkage=static");
+
+ permute_ids[0] = 6; /* int f(int *p) */
+ permute_ids[1] = 3; /* struct s1 */
+ permute_ids[2] = 5; /* int (*)(int *p) */
+ permute_ids[3] = 4; /* struct s2 */
+ err = btf__permute(split_btf, permute_ids, NULL);
+ if (!ASSERT_OK(err, "btf__permute"))
+ goto cleanup;
+
+ VALIDATE_RAW_BTF(
+ split_btf,
+ "[1] INT 'int' size=4 bits_offset=0 nr_bits=32 encoding=SIGNED",
+ "[2] PTR '(anon)' type_id=1",
+ "[3] FUNC 'f' type_id=5 linkage=static",
+ "[4] STRUCT 's1' size=4 vlen=1\n"
+ "\t'm' type_id=1 bits_offset=0",
+ "[5] FUNC_PROTO '(anon)' ret_type_id=1 vlen=1\n"
+ "\t'p' type_id=2",
+ "[6] STRUCT 's2' size=4 vlen=1\n"
+ "\t'm' type_id=1 bits_offset=0");
+
+cleanup:
+ btf__free(split_btf);
+ btf__free(base_btf);
+}
+
+void test_btf_permute(void)
+{
+ if (test__start_subtest("permute_base"))
+ test_permute_base();
+ if (test__start_subtest("permute_split"))
+ test_permute_split();
+}
--
2.34.1
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