selftests/bpf: Test bpf_link's get_next_id, get_fd_by_id, and get_obj_info
Extend bpf_obj_id selftest to verify bpf_link's observability APIs. Signed-off-by: Andrii Nakryiko <andriin@fb.com> Signed-off-by: Alexei Starovoitov <ast@kernel.org> Link: https://lore.kernel.org/bpf/20200429001614.1544-7-andriin@fb.com
This commit is contained in:
Andrii Nakryiko
Alexei Starovoitov
parent
0dbc866832
commit
2c2837b09e
|
|
@ -1,26 +1,30 @@
|
|||
// SPDX-License-Identifier: GPL-2.0
|
||||
#include <test_progs.h>
|
||||
|
||||
#define nr_iters 2
|
||||
|
||||
void test_bpf_obj_id(void)
|
||||
{
|
||||
const __u64 array_magic_value = 0xfaceb00c;
|
||||
const __u32 array_key = 0;
|
||||
const int nr_iters = 2;
|
||||
const char *file = "./test_obj_id.o";
|
||||
const char *expected_prog_name = "test_obj_id";
|
||||
const char *expected_map_name = "test_map_id";
|
||||
const __u64 nsec_per_sec = 1000000000;
|
||||
|
||||
struct bpf_object *objs[nr_iters];
|
||||
struct bpf_object *objs[nr_iters] = {};
|
||||
struct bpf_link *links[nr_iters] = {};
|
||||
struct bpf_program *prog;
|
||||
int prog_fds[nr_iters], map_fds[nr_iters];
|
||||
/* +1 to test for the info_len returned by kernel */
|
||||
struct bpf_prog_info prog_infos[nr_iters + 1];
|
||||
struct bpf_map_info map_infos[nr_iters + 1];
|
||||
struct bpf_link_info link_infos[nr_iters + 1];
|
||||
/* Each prog only uses one map. +1 to test nr_map_ids
|
||||
* returned by kernel.
|
||||
*/
|
||||
__u32 map_ids[nr_iters + 1];
|
||||
char jited_insns[128], xlated_insns[128], zeros[128];
|
||||
char jited_insns[128], xlated_insns[128], zeros[128], tp_name[128];
|
||||
__u32 i, next_id, info_len, nr_id_found, duration = 0;
|
||||
struct timespec real_time_ts, boot_time_ts;
|
||||
int err = 0;
|
||||
|
|
@ -36,14 +40,15 @@ void test_bpf_obj_id(void)
|
|||
CHECK(err >= 0 || errno != ENOENT,
|
||||
"get-fd-by-notexist-map-id", "err %d errno %d\n", err, errno);
|
||||
|
||||
for (i = 0; i < nr_iters; i++)
|
||||
objs[i] = NULL;
|
||||
err = bpf_link_get_fd_by_id(0);
|
||||
CHECK(err >= 0 || errno != ENOENT,
|
||||
"get-fd-by-notexist-link-id", "err %d errno %d\n", err, errno);
|
||||
|
||||
/* Check bpf_obj_get_info_by_fd() */
|
||||
bzero(zeros, sizeof(zeros));
|
||||
for (i = 0; i < nr_iters; i++) {
|
||||
now = time(NULL);
|
||||
err = bpf_prog_load(file, BPF_PROG_TYPE_SOCKET_FILTER,
|
||||
err = bpf_prog_load(file, BPF_PROG_TYPE_RAW_TRACEPOINT,
|
||||
&objs[i], &prog_fds[i]);
|
||||
/* test_obj_id.o is a dumb prog. It should never fail
|
||||
* to load.
|
||||
|
|
@ -60,6 +65,17 @@ void test_bpf_obj_id(void)
|
|||
if (CHECK_FAIL(err))
|
||||
goto done;
|
||||
|
||||
prog = bpf_object__find_program_by_title(objs[i],
|
||||
"raw_tp/sys_enter");
|
||||
if (CHECK_FAIL(!prog))
|
||||
goto done;
|
||||
links[i] = bpf_program__attach(prog);
|
||||
err = libbpf_get_error(links[i]);
|
||||
if (CHECK(err, "prog_attach", "prog #%d, err %d\n", i, err)) {
|
||||
links[i] = NULL;
|
||||
goto done;
|
||||
}
|
||||
|
||||
/* Check getting map info */
|
||||
info_len = sizeof(struct bpf_map_info) * 2;
|
||||
bzero(&map_infos[i], info_len);
|
||||
|
|
@ -107,7 +123,7 @@ void test_bpf_obj_id(void)
|
|||
load_time = (real_time_ts.tv_sec - boot_time_ts.tv_sec)
|
||||
+ (prog_infos[i].load_time / nsec_per_sec);
|
||||
if (CHECK(err ||
|
||||
prog_infos[i].type != BPF_PROG_TYPE_SOCKET_FILTER ||
|
||||
prog_infos[i].type != BPF_PROG_TYPE_RAW_TRACEPOINT ||
|
||||
info_len != sizeof(struct bpf_prog_info) ||
|
||||
(env.jit_enabled && !prog_infos[i].jited_prog_len) ||
|
||||
(env.jit_enabled &&
|
||||
|
|
@ -120,7 +136,11 @@ void test_bpf_obj_id(void)
|
|||
*(int *)(long)prog_infos[i].map_ids != map_infos[i].id ||
|
||||
strcmp((char *)prog_infos[i].name, expected_prog_name),
|
||||
"get-prog-info(fd)",
|
||||
"err %d errno %d i %d type %d(%d) info_len %u(%zu) jit_enabled %d jited_prog_len %u xlated_prog_len %u jited_prog %d xlated_prog %d load_time %lu(%lu) uid %u(%u) nr_map_ids %u(%u) map_id %u(%u) name %s(%s)\n",
|
||||
"err %d errno %d i %d type %d(%d) info_len %u(%zu) "
|
||||
"jit_enabled %d jited_prog_len %u xlated_prog_len %u "
|
||||
"jited_prog %d xlated_prog %d load_time %lu(%lu) "
|
||||
"uid %u(%u) nr_map_ids %u(%u) map_id %u(%u) "
|
||||
"name %s(%s)\n",
|
||||
err, errno, i,
|
||||
prog_infos[i].type, BPF_PROG_TYPE_SOCKET_FILTER,
|
||||
info_len, sizeof(struct bpf_prog_info),
|
||||
|
|
@ -135,6 +155,33 @@ void test_bpf_obj_id(void)
|
|||
*(int *)(long)prog_infos[i].map_ids, map_infos[i].id,
|
||||
prog_infos[i].name, expected_prog_name))
|
||||
goto done;
|
||||
|
||||
/* Check getting link info */
|
||||
info_len = sizeof(struct bpf_link_info) * 2;
|
||||
bzero(&link_infos[i], info_len);
|
||||
link_infos[i].raw_tracepoint.tp_name = (__u64)&tp_name;
|
||||
link_infos[i].raw_tracepoint.tp_name_len = sizeof(tp_name);
|
||||
err = bpf_obj_get_info_by_fd(bpf_link__fd(links[i]),
|
||||
&link_infos[i], &info_len);
|
||||
if (CHECK(err ||
|
||||
link_infos[i].type != BPF_LINK_TYPE_RAW_TRACEPOINT ||
|
||||
link_infos[i].prog_id != prog_infos[i].id ||
|
||||
link_infos[i].raw_tracepoint.tp_name != (__u64)&tp_name ||
|
||||
strcmp((char *)link_infos[i].raw_tracepoint.tp_name,
|
||||
"sys_enter") ||
|
||||
info_len != sizeof(struct bpf_link_info),
|
||||
"get-link-info(fd)",
|
||||
"err %d errno %d info_len %u(%zu) type %d(%d) id %d "
|
||||
"prog_id %d (%d) tp_name %s(%s)\n",
|
||||
err, errno,
|
||||
info_len, sizeof(struct bpf_link_info),
|
||||
link_infos[i].type, BPF_LINK_TYPE_RAW_TRACEPOINT,
|
||||
link_infos[i].id,
|
||||
link_infos[i].prog_id, prog_infos[i].id,
|
||||
(char *)link_infos[i].raw_tracepoint.tp_name,
|
||||
"sys_enter"))
|
||||
goto done;
|
||||
|
||||
}
|
||||
|
||||
/* Check bpf_prog_get_next_id() */
|
||||
|
|
@ -247,7 +294,52 @@ void test_bpf_obj_id(void)
|
|||
"nr_id_found %u(%u)\n",
|
||||
nr_id_found, nr_iters);
|
||||
|
||||
done:
|
||||
/* Check bpf_link_get_next_id() */
|
||||
nr_id_found = 0;
|
||||
next_id = 0;
|
||||
while (!bpf_link_get_next_id(next_id, &next_id)) {
|
||||
struct bpf_link_info link_info;
|
||||
int link_fd, cmp_res;
|
||||
|
||||
info_len = sizeof(link_info);
|
||||
memset(&link_info, 0, info_len);
|
||||
|
||||
link_fd = bpf_link_get_fd_by_id(next_id);
|
||||
if (link_fd < 0 && errno == ENOENT)
|
||||
/* The bpf_link is in the dead row */
|
||||
continue;
|
||||
if (CHECK(link_fd < 0, "get-link-fd(next_id)",
|
||||
"link_fd %d next_id %u errno %d\n",
|
||||
link_fd, next_id, errno))
|
||||
break;
|
||||
|
||||
for (i = 0; i < nr_iters; i++)
|
||||
if (link_infos[i].id == next_id)
|
||||
break;
|
||||
|
||||
if (i == nr_iters)
|
||||
continue;
|
||||
|
||||
nr_id_found++;
|
||||
|
||||
err = bpf_obj_get_info_by_fd(link_fd, &link_info, &info_len);
|
||||
cmp_res = memcmp(&link_info, &link_infos[i],
|
||||
offsetof(struct bpf_link_info, raw_tracepoint));
|
||||
CHECK(err || info_len != sizeof(link_info) || cmp_res,
|
||||
"check get-link-info(next_id->fd)",
|
||||
"err %d errno %d info_len %u(%zu) memcmp %d\n",
|
||||
err, errno, info_len, sizeof(struct bpf_link_info),
|
||||
cmp_res);
|
||||
|
||||
close(link_fd);
|
||||
}
|
||||
CHECK(nr_id_found != nr_iters,
|
||||
"check total link id found by get_next_id",
|
||||
"nr_id_found %u(%u)\n", nr_id_found, nr_iters);
|
||||
|
||||
done:
|
||||
for (i = 0; i < nr_iters; i++) {
|
||||
bpf_link__destroy(links[i]);
|
||||
bpf_object__close(objs[i]);
|
||||
}
|
||||
}
|
||||
|
|
|
|||
|
|
@ -3,16 +3,8 @@
|
|||
*/
|
||||
#include <stddef.h>
|
||||
#include <linux/bpf.h>
|
||||
#include <linux/pkt_cls.h>
|
||||
#include <bpf/bpf_helpers.h>
|
||||
|
||||
/* It is a dumb bpf program such that it must have no
|
||||
* issue to be loaded since testing the verifier is
|
||||
* not the focus here.
|
||||
*/
|
||||
|
||||
int _version SEC("version") = 1;
|
||||
|
||||
struct {
|
||||
__uint(type, BPF_MAP_TYPE_ARRAY);
|
||||
__uint(max_entries, 1);
|
||||
|
|
@ -20,13 +12,13 @@ struct {
|
|||
__type(value, __u64);
|
||||
} test_map_id SEC(".maps");
|
||||
|
||||
SEC("test_obj_id_dummy")
|
||||
int test_obj_id(struct __sk_buff *skb)
|
||||
SEC("raw_tp/sys_enter")
|
||||
int test_obj_id(void *ctx)
|
||||
{
|
||||
__u32 key = 0;
|
||||
__u64 *value;
|
||||
|
||||
value = bpf_map_lookup_elem(&test_map_id, &key);
|
||||
|
||||
return TC_ACT_OK;
|
||||
return 0;
|
||||
}
|
||||
|
|
|
|||
Loading…
Reference in New Issue