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// 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();
}
|
