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selftests/bpf: Add bpf_core_field_offset() tests 

Add test cases for bpf_core_field_offset() helper.

Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Link: https://lore.kernel.org/bpf/20220509004148.1801791-7-andrii@kernel.org
This commit is contained in:
Andrii Nakryiko 2022-05-08 17:41:45 -07:00 committed by Daniel Borkmann
parent 7715f549a9
commit 785c3342cf
4 changed files with 56 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

13
tools/testing/selftests/bpf/prog_tests/core_reloc.c
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@ -277,13 +277,21 @@ static int duration = 0;
#define SIZE_OUTPUT_DATA(type) \
STRUCT_TO_CHAR_PTR(core_reloc_size_output) { \
.int_sz = sizeof(((type *)0)->int_field), \
.int_off = offsetof(type, int_field), \
.struct_sz = sizeof(((type *)0)->struct_field), \
.struct_off = offsetof(type, struct_field), \
.union_sz = sizeof(((type *)0)->union_field), \
.union_off = offsetof(type, union_field), \
.arr_sz = sizeof(((type *)0)->arr_field), \
.arr_elem_sz = sizeof(((type *)0)->arr_field[0]), \
.arr_off = offsetof(type, arr_field), \
.arr_elem_sz = sizeof(((type *)0)->arr_field[1]), \
.arr_elem_off = offsetof(type, arr_field[1]), \
.ptr_sz = 8, /* always 8-byte pointer for BPF */ \
.ptr_off = offsetof(type, ptr_field), \
.enum_sz = sizeof(((type *)0)->enum_field), \
.enum_off = offsetof(type, enum_field), \
.float_sz = sizeof(((type *)0)->float_field), \
.float_off = offsetof(type, float_field), \
}
#define SIZE_CASE(name) { \
@ -714,9 +722,10 @@ static const struct core_reloc_test_case test_cases[] = {
}),
BITFIELDS_ERR_CASE(bitfields___err_too_big_bitfield),
/* size relocation checks */
/* field size and offset relocation checks */
SIZE_CASE(size),
SIZE_CASE(size___diff_sz),
SIZE_CASE(size___diff_offs),
SIZE_ERR_CASE(size___err_ambiguous),
/* validate type existence and size relocations */

3
tools/testing/selftests/bpf/progs/btf__core_reloc_size___diff_offs.c Normal file
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@ -0,0 +1,3 @@
#include "core_reloc_types.h"
void f(struct core_reloc_size___diff_offs x) {}

18
tools/testing/selftests/bpf/progs/core_reloc_types.h
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@ -785,13 +785,21 @@ struct core_reloc_bitfields___err_too_big_bitfield {
*/
struct core_reloc_size_output {
int int_sz;
int int_off;
int struct_sz;
int struct_off;
int union_sz;
int union_off;
int arr_sz;
int arr_off;
int arr_elem_sz;
int arr_elem_off;
int ptr_sz;
int ptr_off;
int enum_sz;
int enum_off;
int float_sz;
int float_off;
};
struct core_reloc_size {
@ -814,6 +822,16 @@ struct core_reloc_size___diff_sz {
double float_field;
};
struct core_reloc_size___diff_offs {
float float_field;
enum { YET_OTHER_VALUE = 123 } enum_field;
void *ptr_field;
int arr_field[4];
union { int x; } union_field;
struct { int x; } struct_field;
int int_field;
};
/* Error case of two candidates with the fields (int_field) at the same
* offset, but with differing final relocation values: size 4 vs size 1
*/

25
tools/testing/selftests/bpf/progs/test_core_reloc_size.c
View File

@ -15,13 +15,21 @@ struct {
struct core_reloc_size_output {
int int_sz;
int int_off;
int struct_sz;
int struct_off;
int union_sz;
int union_off;
int arr_sz;
int arr_off;
int arr_elem_sz;
int arr_elem_off;
int ptr_sz;
int ptr_off;
int enum_sz;
int enum_off;
int float_sz;
int float_off;
};
struct core_reloc_size {
@ -41,13 +49,28 @@ int test_core_size(void *ctx)
struct core_reloc_size_output *out = (void *)&data.out;
out->int_sz = bpf_core_field_size(in->int_field);
out->int_off = bpf_core_field_offset(in->int_field);
out->struct_sz = bpf_core_field_size(in->struct_field);
out->struct_off = bpf_core_field_offset(in->struct_field);
out->union_sz = bpf_core_field_size(in->union_field);
out->union_off = bpf_core_field_offset(in->union_field);
out->arr_sz = bpf_core_field_size(in->arr_field);
out->arr_elem_sz = bpf_core_field_size(struct core_reloc_size, arr_field[0]);
out->arr_off = bpf_core_field_offset(in->arr_field);
out->arr_elem_sz = bpf_core_field_size(struct core_reloc_size, arr_field[1]);
out->arr_elem_off = bpf_core_field_offset(struct core_reloc_size, arr_field[1]);
out->ptr_sz = bpf_core_field_size(struct core_reloc_size, ptr_field);
out->ptr_off = bpf_core_field_offset(struct core_reloc_size, ptr_field);
out->enum_sz = bpf_core_field_size(struct core_reloc_size, enum_field);
out->enum_off = bpf_core_field_offset(struct core_reloc_size, enum_field);
out->float_sz = bpf_core_field_size(struct core_reloc_size, float_field);
out->float_off = bpf_core_field_offset(struct core_reloc_size, float_field);
return 0;
}