| // SPDX-License-Identifier: GPL-2.0 |
| /* Copyright (c) 2026 Xiaomi */ |
| |
| #include <test_progs.h> |
| #include <bpf/btf.h> |
| #include "btf_helpers.h" |
| |
| static void permute_base_check(struct btf *btf) |
| { |
| VALIDATE_RAW_BTF( |
| btf, |
| "[1] STRUCT 's2' size=4 vlen=1\n" |
| "\t'm' type_id=4 bits_offset=0", |
| "[2] FUNC 'f' type_id=6 linkage=static", |
| "[3] PTR '(anon)' type_id=4", |
| "[4] INT 'int' size=4 bits_offset=0 nr_bits=32 encoding=SIGNED", |
| "[5] STRUCT 's1' size=4 vlen=1\n" |
| "\t'm' type_id=4 bits_offset=0", |
| "[6] FUNC_PROTO '(anon)' ret_type_id=4 vlen=1\n" |
| "\t'p' type_id=3"); |
| } |
| |
| /* Ensure btf__permute works as expected in the base-BTF scenario */ |
| static void test_permute_base(void) |
| { |
| struct btf *btf; |
| __u32 permute_ids[7]; |
| 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] = 0; /* [0] -> [0] */ |
| permute_ids[1] = 4; /* [1] -> [4] */ |
| permute_ids[2] = 3; /* [2] -> [3] */ |
| permute_ids[3] = 5; /* [3] -> [5] */ |
| permute_ids[4] = 1; /* [4] -> [1] */ |
| permute_ids[5] = 6; /* [5] -> [6] */ |
| permute_ids[6] = 2; /* [6] -> [2] */ |
| err = btf__permute(btf, permute_ids, ARRAY_SIZE(permute_ids), NULL); |
| if (!ASSERT_OK(err, "btf__permute_base")) |
| goto done; |
| permute_base_check(btf); |
| |
| /* ids[0] must be 0 for base BTF */ |
| permute_ids[0] = 4; /* [0] -> [0] */ |
| permute_ids[1] = 0; /* [1] -> [4] */ |
| permute_ids[2] = 3; /* [2] -> [3] */ |
| permute_ids[3] = 5; /* [3] -> [5] */ |
| permute_ids[4] = 1; /* [4] -> [1] */ |
| permute_ids[5] = 6; /* [5] -> [6] */ |
| permute_ids[6] = 2; /* [6] -> [2] */ |
| err = btf__permute(btf, permute_ids, ARRAY_SIZE(permute_ids), NULL); |
| if (!ASSERT_ERR(err, "btf__permute_base")) |
| goto done; |
| /* BTF is not modified */ |
| permute_base_check(btf); |
| |
| /* id_map_cnt is invalid */ |
| permute_ids[0] = 0; /* [0] -> [0] */ |
| permute_ids[1] = 4; /* [1] -> [4] */ |
| permute_ids[2] = 3; /* [2] -> [3] */ |
| permute_ids[3] = 5; /* [3] -> [5] */ |
| permute_ids[4] = 1; /* [4] -> [1] */ |
| permute_ids[5] = 6; /* [5] -> [6] */ |
| permute_ids[6] = 2; /* [6] -> [2] */ |
| err = btf__permute(btf, permute_ids, ARRAY_SIZE(permute_ids) - 1, NULL); |
| if (!ASSERT_ERR(err, "btf__permute_base")) |
| goto done; |
| /* BTF is not modified */ |
| permute_base_check(btf); |
| |
| /* Multiple types can not be mapped to the same ID */ |
| permute_ids[0] = 0; |
| permute_ids[1] = 4; |
| permute_ids[2] = 4; |
| permute_ids[3] = 5; |
| permute_ids[4] = 1; |
| permute_ids[5] = 6; |
| permute_ids[6] = 2; |
| err = btf__permute(btf, permute_ids, ARRAY_SIZE(permute_ids), NULL); |
| if (!ASSERT_ERR(err, "btf__permute_base")) |
| goto done; |
| /* BTF is not modified */ |
| permute_base_check(btf); |
| |
| /* Type ID must be valid */ |
| permute_ids[0] = 0; |
| permute_ids[1] = 4; |
| permute_ids[2] = 3; |
| permute_ids[3] = 5; |
| permute_ids[4] = 1; |
| permute_ids[5] = 7; |
| permute_ids[6] = 2; |
| err = btf__permute(btf, permute_ids, ARRAY_SIZE(permute_ids), NULL); |
| if (!ASSERT_ERR(err, "btf__permute_base")) |
| goto done; |
| /* BTF is not modified */ |
| permute_base_check(btf); |
| |
| done: |
| btf__free(btf); |
| } |
| |
| static void permute_split_check(struct btf *btf) |
| { |
| 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 's2' size=4 vlen=1\n" |
| "\t'm' type_id=1 bits_offset=0", |
| "[4] FUNC 'f' type_id=5 linkage=static", |
| "[5] FUNC_PROTO '(anon)' ret_type_id=1 vlen=1\n" |
| "\t'p' type_id=2", |
| "[6] STRUCT 's1' size=4 vlen=1\n" |
| "\t'm' type_id=1 bits_offset=0"); |
| } |
| |
| /* Ensure btf__permute works as expected in the split-BTF scenario */ |
| static void test_permute_split(void) |
| { |
| struct btf *split_btf = NULL, *base_btf = NULL; |
| __u32 permute_ids[4]; |
| int err, start_id; |
| |
| 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"); |
| |
| start_id = btf__type_cnt(base_btf); |
| permute_ids[3 - start_id] = 6; /* [3] -> [6] */ |
| permute_ids[4 - start_id] = 3; /* [4] -> [3] */ |
| permute_ids[5 - start_id] = 5; /* [5] -> [5] */ |
| permute_ids[6 - start_id] = 4; /* [6] -> [4] */ |
| err = btf__permute(split_btf, permute_ids, ARRAY_SIZE(permute_ids), NULL); |
| if (!ASSERT_OK(err, "btf__permute_split")) |
| goto cleanup; |
| permute_split_check(split_btf); |
| |
| /* |
| * For split BTF, id_map_cnt must equal to the number of types |
| * added on top of base BTF |
| */ |
| permute_ids[3 - start_id] = 4; |
| permute_ids[4 - start_id] = 3; |
| permute_ids[5 - start_id] = 5; |
| permute_ids[6 - start_id] = 6; |
| err = btf__permute(split_btf, permute_ids, ARRAY_SIZE(permute_ids) - 1, NULL); |
| if (!ASSERT_ERR(err, "btf__permute_split")) |
| goto cleanup; |
| /* BTF is not modified */ |
| permute_split_check(split_btf); |
| |
| /* Multiple types can not be mapped to the same ID */ |
| permute_ids[3 - start_id] = 4; |
| permute_ids[4 - start_id] = 3; |
| permute_ids[5 - start_id] = 3; |
| permute_ids[6 - start_id] = 6; |
| err = btf__permute(split_btf, permute_ids, ARRAY_SIZE(permute_ids), NULL); |
| if (!ASSERT_ERR(err, "btf__permute_split")) |
| goto cleanup; |
| /* BTF is not modified */ |
| permute_split_check(split_btf); |
| |
| /* Can not map to base ID */ |
| permute_ids[3 - start_id] = 4; |
| permute_ids[4 - start_id] = 2; |
| permute_ids[5 - start_id] = 5; |
| permute_ids[6 - start_id] = 6; |
| err = btf__permute(split_btf, permute_ids, ARRAY_SIZE(permute_ids), NULL); |
| if (!ASSERT_ERR(err, "btf__permute_split")) |
| goto cleanup; |
| /* BTF is not modified */ |
| permute_split_check(split_btf); |
| |
| 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(); |
| } |
