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selftests/bpf: Add test cases for btf__permute functionality
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 base BTF - test_permute_split: Tests permutation on split BTF Signed-off-by: Donglin Peng <pengdonglin@xiaomi.com> Signed-off-by: Andrii Nakryiko <andrii@kernel.org> Acked-by: Eduard Zingerman <eddyz87@gmail.com> Link: https://lore.kernel.org/bpf/20260109130003.3313716-3-dolinux.peng@gmail.com
This commit is contained in:
Donglin Peng
Andrii Nakryiko
parent
6fbf129c49
commit
a3acd7d434
244
tools/testing/selftests/bpf/prog_tests/btf_permute.c
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244
tools/testing/selftests/bpf/prog_tests/btf_permute.c
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@ -0,0 +1,244 @@
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// SPDX-License-Identifier: GPL-2.0
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/* Copyright (c) 2026 Xiaomi */
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#include <test_progs.h>
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#include <bpf/btf.h>
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#include "btf_helpers.h"
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static void permute_base_check(struct btf *btf)
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{
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VALIDATE_RAW_BTF(
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btf,
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"[1] STRUCT 's2' size=4 vlen=1\n"
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"\t'm' type_id=4 bits_offset=0",
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"[2] FUNC 'f' type_id=6 linkage=static",
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"[3] PTR '(anon)' type_id=4",
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"[4] INT 'int' size=4 bits_offset=0 nr_bits=32 encoding=SIGNED",
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"[5] STRUCT 's1' size=4 vlen=1\n"
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"\t'm' type_id=4 bits_offset=0",
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"[6] FUNC_PROTO '(anon)' ret_type_id=4 vlen=1\n"
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"\t'p' type_id=3");
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}
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/* Ensure btf__permute works as expected in the base-BTF scenario */
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static void test_permute_base(void)
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{
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struct btf *btf;
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__u32 permute_ids[7];
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int err;
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btf = btf__new_empty();
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if (!ASSERT_OK_PTR(btf, "empty_main_btf"))
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return;
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btf__add_int(btf, "int", 4, BTF_INT_SIGNED); /* [1] int */
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btf__add_ptr(btf, 1); /* [2] ptr to int */
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btf__add_struct(btf, "s1", 4); /* [3] struct s1 { */
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btf__add_field(btf, "m", 1, 0, 0); /* int m; */
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/* } */
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btf__add_struct(btf, "s2", 4); /* [4] struct s2 { */
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btf__add_field(btf, "m", 1, 0, 0); /* int m; */
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/* } */
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btf__add_func_proto(btf, 1); /* [5] int (*)(int *p); */
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btf__add_func_param(btf, "p", 2);
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btf__add_func(btf, "f", BTF_FUNC_STATIC, 5); /* [6] int f(int *p); */
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VALIDATE_RAW_BTF(
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btf,
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"[1] INT 'int' size=4 bits_offset=0 nr_bits=32 encoding=SIGNED",
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"[2] PTR '(anon)' type_id=1",
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"[3] STRUCT 's1' size=4 vlen=1\n"
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"\t'm' type_id=1 bits_offset=0",
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"[4] STRUCT 's2' size=4 vlen=1\n"
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"\t'm' type_id=1 bits_offset=0",
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"[5] FUNC_PROTO '(anon)' ret_type_id=1 vlen=1\n"
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"\t'p' type_id=2",
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"[6] FUNC 'f' type_id=5 linkage=static");
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permute_ids[0] = 0; /* [0] -> [0] */
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permute_ids[1] = 4; /* [1] -> [4] */
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permute_ids[2] = 3; /* [2] -> [3] */
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permute_ids[3] = 5; /* [3] -> [5] */
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permute_ids[4] = 1; /* [4] -> [1] */
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permute_ids[5] = 6; /* [5] -> [6] */
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permute_ids[6] = 2; /* [6] -> [2] */
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err = btf__permute(btf, permute_ids, ARRAY_SIZE(permute_ids), NULL);
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if (!ASSERT_OK(err, "btf__permute_base"))
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goto done;
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permute_base_check(btf);
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/* ids[0] must be 0 for base BTF */
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permute_ids[0] = 4; /* [0] -> [0] */
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permute_ids[1] = 0; /* [1] -> [4] */
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permute_ids[2] = 3; /* [2] -> [3] */
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permute_ids[3] = 5; /* [3] -> [5] */
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permute_ids[4] = 1; /* [4] -> [1] */
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permute_ids[5] = 6; /* [5] -> [6] */
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permute_ids[6] = 2; /* [6] -> [2] */
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err = btf__permute(btf, permute_ids, ARRAY_SIZE(permute_ids), NULL);
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if (!ASSERT_ERR(err, "btf__permute_base"))
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goto done;
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/* BTF is not modified */
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permute_base_check(btf);
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/* id_map_cnt is invalid */
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permute_ids[0] = 0; /* [0] -> [0] */
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permute_ids[1] = 4; /* [1] -> [4] */
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permute_ids[2] = 3; /* [2] -> [3] */
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permute_ids[3] = 5; /* [3] -> [5] */
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permute_ids[4] = 1; /* [4] -> [1] */
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permute_ids[5] = 6; /* [5] -> [6] */
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permute_ids[6] = 2; /* [6] -> [2] */
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err = btf__permute(btf, permute_ids, ARRAY_SIZE(permute_ids) - 1, NULL);
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if (!ASSERT_ERR(err, "btf__permute_base"))
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goto done;
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/* BTF is not modified */
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permute_base_check(btf);
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/* Multiple types can not be mapped to the same ID */
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permute_ids[0] = 0;
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permute_ids[1] = 4;
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permute_ids[2] = 4;
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permute_ids[3] = 5;
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permute_ids[4] = 1;
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permute_ids[5] = 6;
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permute_ids[6] = 2;
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err = btf__permute(btf, permute_ids, ARRAY_SIZE(permute_ids), NULL);
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if (!ASSERT_ERR(err, "btf__permute_base"))
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goto done;
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/* BTF is not modified */
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permute_base_check(btf);
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/* Type ID must be valid */
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permute_ids[0] = 0;
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permute_ids[1] = 4;
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permute_ids[2] = 3;
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permute_ids[3] = 5;
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permute_ids[4] = 1;
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permute_ids[5] = 7;
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permute_ids[6] = 2;
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err = btf__permute(btf, permute_ids, ARRAY_SIZE(permute_ids), NULL);
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if (!ASSERT_ERR(err, "btf__permute_base"))
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goto done;
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/* BTF is not modified */
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permute_base_check(btf);
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done:
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btf__free(btf);
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}
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static void permute_split_check(struct btf *btf)
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{
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VALIDATE_RAW_BTF(
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btf,
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"[1] INT 'int' size=4 bits_offset=0 nr_bits=32 encoding=SIGNED",
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"[2] PTR '(anon)' type_id=1",
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"[3] STRUCT 's2' size=4 vlen=1\n"
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"\t'm' type_id=1 bits_offset=0",
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"[4] FUNC 'f' type_id=5 linkage=static",
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"[5] FUNC_PROTO '(anon)' ret_type_id=1 vlen=1\n"
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"\t'p' type_id=2",
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"[6] STRUCT 's1' size=4 vlen=1\n"
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"\t'm' type_id=1 bits_offset=0");
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}
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/* Ensure btf__permute works as expected in the split-BTF scenario */
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static void test_permute_split(void)
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{
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struct btf *split_btf = NULL, *base_btf = NULL;
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__u32 permute_ids[4];
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int err, start_id;
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base_btf = btf__new_empty();
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if (!ASSERT_OK_PTR(base_btf, "empty_main_btf"))
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return;
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btf__add_int(base_btf, "int", 4, BTF_INT_SIGNED); /* [1] int */
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btf__add_ptr(base_btf, 1); /* [2] ptr to int */
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VALIDATE_RAW_BTF(
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base_btf,
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"[1] INT 'int' size=4 bits_offset=0 nr_bits=32 encoding=SIGNED",
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"[2] PTR '(anon)' type_id=1");
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split_btf = btf__new_empty_split(base_btf);
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if (!ASSERT_OK_PTR(split_btf, "empty_split_btf"))
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goto cleanup;
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btf__add_struct(split_btf, "s1", 4); /* [3] struct s1 { */
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btf__add_field(split_btf, "m", 1, 0, 0); /* int m; */
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/* } */
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btf__add_struct(split_btf, "s2", 4); /* [4] struct s2 { */
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btf__add_field(split_btf, "m", 1, 0, 0); /* int m; */
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/* } */
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btf__add_func_proto(split_btf, 1); /* [5] int (*)(int p); */
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btf__add_func_param(split_btf, "p", 2);
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btf__add_func(split_btf, "f", BTF_FUNC_STATIC, 5); /* [6] int f(int *p); */
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VALIDATE_RAW_BTF(
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split_btf,
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"[1] INT 'int' size=4 bits_offset=0 nr_bits=32 encoding=SIGNED",
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"[2] PTR '(anon)' type_id=1",
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"[3] STRUCT 's1' size=4 vlen=1\n"
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"\t'm' type_id=1 bits_offset=0",
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"[4] STRUCT 's2' size=4 vlen=1\n"
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"\t'm' type_id=1 bits_offset=0",
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"[5] FUNC_PROTO '(anon)' ret_type_id=1 vlen=1\n"
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"\t'p' type_id=2",
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"[6] FUNC 'f' type_id=5 linkage=static");
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start_id = btf__type_cnt(base_btf);
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permute_ids[3 - start_id] = 6; /* [3] -> [6] */
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permute_ids[4 - start_id] = 3; /* [4] -> [3] */
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permute_ids[5 - start_id] = 5; /* [5] -> [5] */
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permute_ids[6 - start_id] = 4; /* [6] -> [4] */
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err = btf__permute(split_btf, permute_ids, ARRAY_SIZE(permute_ids), NULL);
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if (!ASSERT_OK(err, "btf__permute_split"))
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goto cleanup;
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permute_split_check(split_btf);
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/*
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* For split BTF, id_map_cnt must equal to the number of types
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* added on top of base BTF
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*/
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permute_ids[3 - start_id] = 4;
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permute_ids[4 - start_id] = 3;
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permute_ids[5 - start_id] = 5;
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permute_ids[6 - start_id] = 6;
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err = btf__permute(split_btf, permute_ids, ARRAY_SIZE(permute_ids) - 1, NULL);
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if (!ASSERT_ERR(err, "btf__permute_split"))
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goto cleanup;
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/* BTF is not modified */
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permute_split_check(split_btf);
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/* Multiple types can not be mapped to the same ID */
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permute_ids[3 - start_id] = 4;
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permute_ids[4 - start_id] = 3;
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permute_ids[5 - start_id] = 3;
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permute_ids[6 - start_id] = 6;
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err = btf__permute(split_btf, permute_ids, ARRAY_SIZE(permute_ids), NULL);
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if (!ASSERT_ERR(err, "btf__permute_split"))
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goto cleanup;
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/* BTF is not modified */
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permute_split_check(split_btf);
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/* Can not map to base ID */
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permute_ids[3 - start_id] = 4;
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permute_ids[4 - start_id] = 2;
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permute_ids[5 - start_id] = 5;
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permute_ids[6 - start_id] = 6;
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err = btf__permute(split_btf, permute_ids, ARRAY_SIZE(permute_ids), NULL);
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if (!ASSERT_ERR(err, "btf__permute_split"))
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goto cleanup;
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/* BTF is not modified */
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permute_split_check(split_btf);
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cleanup:
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btf__free(split_btf);
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btf__free(base_btf);
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}
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void test_btf_permute(void)
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{
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if (test__start_subtest("permute_base"))
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test_permute_base();
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if (test__start_subtest("permute_split"))
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test_permute_split();
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}
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