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bpf: Expect !info.func_info and insn_off name changes in test_btf/libbpf/bpftool

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Similar to info.jited_*, info.func_info could be 0 if
bpf_dump_raw_ok() == false.

This patch makes changes to test_btf and bpftool to expect info.func_info
could be 0.

This patch also makes the needed changes for s/insn_offset/insn_off/.

Signed-off-by: Martin KaFai Lau <kafai@fb.com>
Acked-by: Yonghong Song <yhs@fb.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
This commit is contained in:
Martin KaFai Lau 2018-12-05 17:35:47 -08:00 committed by Alexei Starovoitov
parent 555249df71
commit 84ecc1f98c
4 changed files with 22 additions and 9 deletions
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7
tools/bpf/bpftool/prog.c
View File

@ -589,6 +589,13 @@ static int do_dump(int argc, char **argv)
goto err_free;
}
if (func_info && !info.func_info) {
/* kernel.kptr_restrict is set. No func_info available. */
free(func_info);
func_info = NULL;
finfo_cnt = 0;
}
if ((member_len == &info.jited_prog_len &&
info.jited_prog_insns == 0) ||
(member_len == &info.xlated_prog_len &&

4
tools/bpf/bpftool/xlated_dumper.c
View File

@ -261,7 +261,7 @@ void dump_xlated_json(struct dump_data *dd, void *buf, unsigned int len,
jsonw_start_object(json_wtr);
if (btf && record) {
if (record->insn_offset == i) {
if (record->insn_off == i) {
btf_dumper_type_only(btf, record->type_id,
func_sig,
sizeof(func_sig));
@ -330,7 +330,7 @@ void dump_xlated_plain(struct dump_data *dd, void *buf, unsigned int len,
}
if (btf && record) {
if (record->insn_offset == i) {
if (record->insn_off == i) {
btf_dumper_type_only(btf, record->type_id,
func_sig,
sizeof(func_sig));

12
tools/lib/bpf/btf.c
View File

@ -45,7 +45,7 @@ struct btf_ext {
/* The minimum bpf_func_info checked by the loader */
struct bpf_func_info_min {
__u32 insn_offset;
__u32 insn_off;
__u32 type_id;
};
@ -670,7 +670,7 @@ int btf_ext__reloc_init(struct btf *btf, struct btf_ext *btf_ext,
memcpy(data, sinfo->data, records_len);
/* adjust the insn_offset, the data in .BTF.ext is
/* adjust the insn_off, the data in .BTF.ext is
* the actual byte offset, and the kernel expects
* the offset in term of bpf_insn.
*
@ -681,7 +681,7 @@ int btf_ext__reloc_init(struct btf *btf, struct btf_ext *btf_ext,
struct bpf_func_info_min *record;
record = data + i * record_size;
record->insn_offset /= sizeof(struct bpf_insn);
record->insn_off /= sizeof(struct bpf_insn);
}
*func_info = data;
@ -722,15 +722,15 @@ int btf_ext__reloc(struct btf *btf, struct btf_ext *btf_ext,
return -ENOMEM;
memcpy(data + existing_flen, sinfo->data, records_len);
/* adjust insn_offset only, the rest data will be passed
/* adjust insn_off only, the rest data will be passed
* to the kernel.
*/
for (i = 0; i < sinfo->num_func_info; i++) {
struct bpf_func_info_min *record;
record = data + existing_flen + i * record_size;
record->insn_offset =
record->insn_offset / sizeof(struct bpf_insn) +
record->insn_off =
record->insn_off / sizeof(struct bpf_insn) +
insns_cnt;
}
*func_info = data;

8
tools/testing/selftests/bpf/test_btf.c
View File

@ -3156,7 +3156,7 @@ static struct btf_func_type_test {
},
{
.descr = "func_type (Incorrect bpf_func_info.insn_offset)",
.descr = "func_type (Incorrect bpf_func_info.insn_off)",
.raw_types = {
BTF_TYPE_INT_ENC(NAME_TBD, BTF_INT_SIGNED, 0, 32, 4), /* [1] */
BTF_TYPE_INT_ENC(NAME_TBD, 0, 0, 32, 4), /* [2] */
@ -3303,6 +3303,12 @@ static int do_test_func_type(int test_num)
goto done;
}
if (CHECK(!info.func_info,
"info.func_info == 0. kernel.kptr_restrict is set?")) {
err = -1;
goto done;
}
finfo = func_info;
for (i = 0; i < 2; i++) {
if (CHECK(finfo->type_id != test->func_info[i][1],