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bpftool: Fix bpftool build by switching to bpf_object__open_file() 

As part of libbpf in 5e61f27070 ("libbpf: stop enforcing kern_version,
populate it for users") non-LIBBPF_API __bpf_object__open_xattr() API
was removed from libbpf.h header. This broke bpftool, which relied on
that function. This patch fixes the build by switching to newly added
bpf_object__open_file() which provides the same capabilities, but is
official and future-proof API.

v1->v2:
- fix prog_type shadowing (Stanislav).

Fixes: 5e61f27070 ("libbpf: stop enforcing kern_version, populate it for users")
Reported-by: Stanislav Fomichev <sdf@google.com>
Signed-off-by: Andrii Nakryiko <andriin@fb.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Reviewed-by: Stanislav Fomichev <sdf@google.com>
Link: https://lore.kernel.org/bpf/20191007225604.2006146-1-andriin@fb.com
This commit is contained in:
Andrii Nakryiko 2019-10-07 15:56:04 -07:00 committed by Alexei Starovoitov
parent dcb5f40054
commit 32e3e58e4c
3 changed files with 15 additions and 13 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

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

@ -27,7 +27,7 @@ bool json_output;
bool show_pinned;
bool block_mount;
bool verifier_logs;
int bpf_flags;
bool relaxed_maps;
struct pinned_obj_table prog_table;
struct pinned_obj_table map_table;
@ -396,7 +396,7 @@ int main(int argc, char **argv)
show_pinned = true;
break;
case 'm':
bpf_flags = MAPS_RELAX_COMPAT;
relaxed_maps = true;
break;
case 'n':
block_mount = true;

2
tools/bpf/bpftool/main.h
View File

@ -94,7 +94,7 @@ extern bool json_output;
extern bool show_pinned;
extern bool block_mount;
extern bool verifier_logs;
extern int bpf_flags;
extern bool relaxed_maps;
extern struct pinned_obj_table prog_table;
extern struct pinned_obj_table map_table;

22
tools/bpf/bpftool/prog.c
View File

@ -1092,9 +1092,7 @@ static int do_run(int argc, char **argv)
static int load_with_options(int argc, char **argv, bool first_prog_only)
{
struct bpf_object_load_attr load_attr = { 0 };
struct bpf_object_open_attr open_attr = {
.prog_type = BPF_PROG_TYPE_UNSPEC,
};
enum bpf_prog_type common_prog_type = BPF_PROG_TYPE_UNSPEC;
enum bpf_attach_type expected_attach_type;
struct map_replace *map_replace = NULL;
struct bpf_program *prog = NULL, *pos;
@ -1105,11 +1103,16 @@ static int load_with_options(int argc, char **argv, bool first_prog_only)
const char *pinfile;
unsigned int i, j;
__u32 ifindex = 0;
const char *file;
int idx, err;
LIBBPF_OPTS(bpf_object_open_opts, open_opts,
.relaxed_maps = relaxed_maps,
);
if (!REQ_ARGS(2))
return -1;
open_attr.file = GET_ARG();
file = GET_ARG();
pinfile = GET_ARG();
while (argc) {
@ -1118,7 +1121,7 @@ static int load_with_options(int argc, char **argv, bool first_prog_only)
NEXT_ARG();
if (open_attr.prog_type != BPF_PROG_TYPE_UNSPEC) {
if (common_prog_type != BPF_PROG_TYPE_UNSPEC) {
p_err("program type already specified");
goto err_free_reuse_maps;
}
@ -1135,8 +1138,7 @@ static int load_with_options(int argc, char **argv, bool first_prog_only)
strcat(type, *argv);
strcat(type, "/");
err = libbpf_prog_type_by_name(type,
&open_attr.prog_type,
err = libbpf_prog_type_by_name(type, &common_prog_type,
&expected_attach_type);
free(type);
if (err < 0)
@ -1224,16 +1226,16 @@ static int load_with_options(int argc, char **argv, bool first_prog_only)
set_max_rlimit();
obj = __bpf_object__open_xattr(&open_attr, bpf_flags);
obj = bpf_object__open_file(file, &open_opts);
if (IS_ERR_OR_NULL(obj)) {
p_err("failed to open object file");
goto err_free_reuse_maps;
}
bpf_object__for_each_program(pos, obj) {
enum bpf_prog_type prog_type = open_attr.prog_type;
enum bpf_prog_type prog_type = common_prog_type;
if (open_attr.prog_type == BPF_PROG_TYPE_UNSPEC) {
if (prog_type == BPF_PROG_TYPE_UNSPEC) {
const char *sec_name = bpf_program__title(pos, false);
err = libbpf_prog_type_by_name(sec_name, &prog_type,