mirrors/linux-stable
1
0
Fork 0
mirror of https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git synced 2024-10-31 16:38:12 +00:00
Code Issues Releases Wiki Activity
linux-stable/tools/testing/selftests/bpf/prog_tests/tailcalls.c
Maciej Fijalkowski 3b03791111 selftests/bpf: Add tailcall_bpf2bpf tests 
Add four tests to tailcalls selftest explicitly named
"tailcall_bpf2bpf_X" as their purpose is to validate that combination
of tailcalls with bpf2bpf calls are working properly.
These tests also validate LD_ABS from subprograms.

Signed-off-by: Maciej Fijalkowski <maciej.fijalkowski@intel.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
2020-09-17 19:56:07 -07:00

819 lines
22 KiB
C
Raw Blame History

// SPDX-License-Identifier: GPL-2.0
#include <test_progs.h>
#include <network_helpers.h>
/* test_tailcall_1 checks basic functionality by patching multiple locations
* in a single program for a single tail call slot with nop->jmp, jmp->nop
* and jmp->jmp rewrites. Also checks for nop->nop.
*/
static void test_tailcall_1(void)
{
int err, map_fd, prog_fd, main_fd, i, j;
struct bpf_map *prog_array;
struct bpf_program *prog;
struct bpf_object *obj;
__u32 retval, duration;
char prog_name[32];
char buff[128] = {};
err = bpf_prog_load("tailcall1.o", BPF_PROG_TYPE_SCHED_CLS, &obj,
&prog_fd);
if (CHECK_FAIL(err))
return;
prog = bpf_object__find_program_by_title(obj, "classifier");
if (CHECK_FAIL(!prog))
goto out;
main_fd = bpf_program__fd(prog);
if (CHECK_FAIL(main_fd < 0))
goto out;
prog_array = bpf_object__find_map_by_name(obj, "jmp_table");
if (CHECK_FAIL(!prog_array))
goto out;
map_fd = bpf_map__fd(prog_array);
if (CHECK_FAIL(map_fd < 0))
goto out;
for (i = 0; i < bpf_map__def(prog_array)->max_entries; i++) {
snprintf(prog_name, sizeof(prog_name), "classifier/%i", i);
prog = bpf_object__find_program_by_title(obj, prog_name);
if (CHECK_FAIL(!prog))
goto out;
prog_fd = bpf_program__fd(prog);
if (CHECK_FAIL(prog_fd < 0))
goto out;
err = bpf_map_update_elem(map_fd, &i, &prog_fd, BPF_ANY);
if (CHECK_FAIL(err))
goto out;
}
for (i = 0; i < bpf_map__def(prog_array)->max_entries; i++) {
err = bpf_prog_test_run(main_fd, 1, buff, sizeof(buff), 0,
&duration, &retval, NULL);
CHECK(err || retval != i, "tailcall",
"err %d errno %d retval %d\n", err, errno, retval);
err = bpf_map_delete_elem(map_fd, &i);
if (CHECK_FAIL(err))
goto out;
}
err = bpf_prog_test_run(main_fd, 1, buff, sizeof(buff), 0,
&duration, &retval, NULL);
CHECK(err || retval != 3, "tailcall", "err %d errno %d retval %d\n",
err, errno, retval);
for (i = 0; i < bpf_map__def(prog_array)->max_entries; i++) {
snprintf(prog_name, sizeof(prog_name), "classifier/%i", i);
prog = bpf_object__find_program_by_title(obj, prog_name);
if (CHECK_FAIL(!prog))
goto out;
prog_fd = bpf_program__fd(prog);
if (CHECK_FAIL(prog_fd < 0))
goto out;
err = bpf_map_update_elem(map_fd, &i, &prog_fd, BPF_ANY);
if (CHECK_FAIL(err))
goto out;
}
err = bpf_prog_test_run(main_fd, 1, buff, sizeof(buff), 0,
&duration, &retval, NULL);
CHECK(err || retval != 0, "tailcall", "err %d errno %d retval %d\n",
err, errno, retval);
for (i = 0; i < bpf_map__def(prog_array)->max_entries; i++) {
j = bpf_map__def(prog_array)->max_entries - 1 - i;
snprintf(prog_name, sizeof(prog_name), "classifier/%i", j);
prog = bpf_object__find_program_by_title(obj, prog_name);
if (CHECK_FAIL(!prog))
goto out;
prog_fd = bpf_program__fd(prog);
if (CHECK_FAIL(prog_fd < 0))
goto out;
err = bpf_map_update_elem(map_fd, &i, &prog_fd, BPF_ANY);
if (CHECK_FAIL(err))
goto out;
}
for (i = 0; i < bpf_map__def(prog_array)->max_entries; i++) {
j = bpf_map__def(prog_array)->max_entries - 1 - i;
err = bpf_prog_test_run(main_fd, 1, buff, sizeof(buff), 0,
&duration, &retval, NULL);
CHECK(err || retval != j, "tailcall",
"err %d errno %d retval %d\n", err, errno, retval);
err = bpf_map_delete_elem(map_fd, &i);
if (CHECK_FAIL(err))
goto out;
}
err = bpf_prog_test_run(main_fd, 1, buff, sizeof(buff), 0,
&duration, &retval, NULL);
CHECK(err || retval != 3, "tailcall", "err %d errno %d retval %d\n",
err, errno, retval);
for (i = 0; i < bpf_map__def(prog_array)->max_entries; i++) {
err = bpf_map_delete_elem(map_fd, &i);
if (CHECK_FAIL(err >= 0 || errno != ENOENT))
goto out;
err = bpf_prog_test_run(main_fd, 1, buff, sizeof(buff), 0,
&duration, &retval, NULL);
CHECK(err || retval != 3, "tailcall",
"err %d errno %d retval %d\n", err, errno, retval);
}
out:
bpf_object__close(obj);
}
/* test_tailcall_2 checks that patching multiple programs for a single
* tail call slot works. It also jumps through several programs and tests
* the tail call limit counter.
*/
static void test_tailcall_2(void)
{
int err, map_fd, prog_fd, main_fd, i;
struct bpf_map *prog_array;
struct bpf_program *prog;
struct bpf_object *obj;
__u32 retval, duration;
char prog_name[32];
char buff[128] = {};
err = bpf_prog_load("tailcall2.o", BPF_PROG_TYPE_SCHED_CLS, &obj,
&prog_fd);
if (CHECK_FAIL(err))
return;
prog = bpf_object__find_program_by_title(obj, "classifier");
if (CHECK_FAIL(!prog))
goto out;
main_fd = bpf_program__fd(prog);
if (CHECK_FAIL(main_fd < 0))
goto out;
prog_array = bpf_object__find_map_by_name(obj, "jmp_table");
if (CHECK_FAIL(!prog_array))
goto out;
map_fd = bpf_map__fd(prog_array);
if (CHECK_FAIL(map_fd < 0))
goto out;
for (i = 0; i < bpf_map__def(prog_array)->max_entries; i++) {
snprintf(prog_name, sizeof(prog_name), "classifier/%i", i);
prog = bpf_object__find_program_by_title(obj, prog_name);
if (CHECK_FAIL(!prog))
goto out;
prog_fd = bpf_program__fd(prog);
if (CHECK_FAIL(prog_fd < 0))
goto out;
err = bpf_map_update_elem(map_fd, &i, &prog_fd, BPF_ANY);
if (CHECK_FAIL(err))
goto out;
}
err = bpf_prog_test_run(main_fd, 1, buff, sizeof(buff), 0,
&duration, &retval, NULL);
CHECK(err || retval != 2, "tailcall", "err %d errno %d retval %d\n",
err, errno, retval);
i = 2;
err = bpf_map_delete_elem(map_fd, &i);
if (CHECK_FAIL(err))
goto out;
err = bpf_prog_test_run(main_fd, 1, buff, sizeof(buff), 0,
&duration, &retval, NULL);
CHECK(err || retval != 1, "tailcall", "err %d errno %d retval %d\n",
err, errno, retval);
i = 0;
err = bpf_map_delete_elem(map_fd, &i);
if (CHECK_FAIL(err))
goto out;
err = bpf_prog_test_run(main_fd, 1, buff, sizeof(buff), 0,
&duration, &retval, NULL);
CHECK(err || retval != 3, "tailcall", "err %d errno %d retval %d\n",
err, errno, retval);
out:
bpf_object__close(obj);
}
/* test_tailcall_3 checks that the count value of the tail call limit
* enforcement matches with expectations.
*/
static void test_tailcall_3(void)
{
int err, map_fd, prog_fd, main_fd, data_fd, i, val;
struct bpf_map *prog_array, *data_map;
struct bpf_program *prog;
struct bpf_object *obj;
__u32 retval, duration;
char buff[128] = {};
err = bpf_prog_load("tailcall3.o", BPF_PROG_TYPE_SCHED_CLS, &obj,
&prog_fd);
if (CHECK_FAIL(err))
return;
prog = bpf_object__find_program_by_title(obj, "classifier");
if (CHECK_FAIL(!prog))
goto out;
main_fd = bpf_program__fd(prog);
if (CHECK_FAIL(main_fd < 0))
goto out;
prog_array = bpf_object__find_map_by_name(obj, "jmp_table");
if (CHECK_FAIL(!prog_array))
goto out;
map_fd = bpf_map__fd(prog_array);
if (CHECK_FAIL(map_fd < 0))
goto out;
prog = bpf_object__find_program_by_title(obj, "classifier/0");
if (CHECK_FAIL(!prog))
goto out;
prog_fd = bpf_program__fd(prog);
if (CHECK_FAIL(prog_fd < 0))
goto out;
i = 0;
err = bpf_map_update_elem(map_fd, &i, &prog_fd, BPF_ANY);
if (CHECK_FAIL(err))
goto out;
err = bpf_prog_test_run(main_fd, 1, buff, sizeof(buff), 0,
&duration, &retval, NULL);
CHECK(err || retval != 1, "tailcall", "err %d errno %d retval %d\n",
err, errno, retval);
data_map = bpf_object__find_map_by_name(obj, "tailcall.bss");
if (CHECK_FAIL(!data_map || !bpf_map__is_internal(data_map)))
return;
data_fd = bpf_map__fd(data_map);
if (CHECK_FAIL(map_fd < 0))
return;
i = 0;
err = bpf_map_lookup_elem(data_fd, &i, &val);
CHECK(err || val != 33, "tailcall count", "err %d errno %d count %d\n",
err, errno, val);
i = 0;
err = bpf_map_delete_elem(map_fd, &i);
if (CHECK_FAIL(err))
goto out;
err = bpf_prog_test_run(main_fd, 1, buff, sizeof(buff), 0,
&duration, &retval, NULL);
CHECK(err || retval != 0, "tailcall", "err %d errno %d retval %d\n",
err, errno, retval);
out:
bpf_object__close(obj);
}
/* test_tailcall_4 checks that the kernel properly selects indirect jump
* for the case where the key is not known. Latter is passed via global
* data to select different targets we can compare return value of.
*/
static void test_tailcall_4(void)
{
int err, map_fd, prog_fd, main_fd, data_fd, i;
struct bpf_map *prog_array, *data_map;
struct bpf_program *prog;
struct bpf_object *obj;
__u32 retval, duration;
static const int zero = 0;
char buff[128] = {};
char prog_name[32];
err = bpf_prog_load("tailcall4.o", BPF_PROG_TYPE_SCHED_CLS, &obj,
&prog_fd);
if (CHECK_FAIL(err))
return;
prog = bpf_object__find_program_by_title(obj, "classifier");
if (CHECK_FAIL(!prog))
goto out;
main_fd = bpf_program__fd(prog);
if (CHECK_FAIL(main_fd < 0))
goto out;
prog_array = bpf_object__find_map_by_name(obj, "jmp_table");
if (CHECK_FAIL(!prog_array))
goto out;
map_fd = bpf_map__fd(prog_array);
if (CHECK_FAIL(map_fd < 0))
goto out;
data_map = bpf_object__find_map_by_name(obj, "tailcall.bss");
if (CHECK_FAIL(!data_map || !bpf_map__is_internal(data_map)))
return;
data_fd = bpf_map__fd(data_map);
if (CHECK_FAIL(map_fd < 0))
return;
for (i = 0; i < bpf_map__def(prog_array)->max_entries; i++) {
snprintf(prog_name, sizeof(prog_name), "classifier/%i", i);
prog = bpf_object__find_program_by_title(obj, prog_name);
if (CHECK_FAIL(!prog))
goto out;
prog_fd = bpf_program__fd(prog);
if (CHECK_FAIL(prog_fd < 0))
goto out;
err = bpf_map_update_elem(map_fd, &i, &prog_fd, BPF_ANY);
if (CHECK_FAIL(err))
goto out;
}
for (i = 0; i < bpf_map__def(prog_array)->max_entries; i++) {
err = bpf_map_update_elem(data_fd, &zero, &i, BPF_ANY);
if (CHECK_FAIL(err))
goto out;
err = bpf_prog_test_run(main_fd, 1, buff, sizeof(buff), 0,
&duration, &retval, NULL);
CHECK(err || retval != i, "tailcall",
"err %d errno %d retval %d\n", err, errno, retval);
}
for (i = 0; i < bpf_map__def(prog_array)->max_entries; i++) {
err = bpf_map_update_elem(data_fd, &zero, &i, BPF_ANY);
if (CHECK_FAIL(err))
goto out;
err = bpf_map_delete_elem(map_fd, &i);
if (CHECK_FAIL(err))
goto out;
err = bpf_prog_test_run(main_fd, 1, buff, sizeof(buff), 0,
&duration, &retval, NULL);
CHECK(err || retval != 3, "tailcall",
"err %d errno %d retval %d\n", err, errno, retval);
}
out:
bpf_object__close(obj);
}
/* test_tailcall_5 probes similarly to test_tailcall_4 that the kernel generates
* an indirect jump when the keys are const but different from different branches.
*/
static void test_tailcall_5(void)
{
int err, map_fd, prog_fd, main_fd, data_fd, i, key[] = { 1111, 1234, 5678 };
struct bpf_map *prog_array, *data_map;
struct bpf_program *prog;
struct bpf_object *obj;
__u32 retval, duration;
static const int zero = 0;
char buff[128] = {};
char prog_name[32];
err = bpf_prog_load("tailcall5.o", BPF_PROG_TYPE_SCHED_CLS, &obj,
&prog_fd);
if (CHECK_FAIL(err))
return;
prog = bpf_object__find_program_by_title(obj, "classifier");
if (CHECK_FAIL(!prog))
goto out;
main_fd = bpf_program__fd(prog);
if (CHECK_FAIL(main_fd < 0))
goto out;
prog_array = bpf_object__find_map_by_name(obj, "jmp_table");
if (CHECK_FAIL(!prog_array))
goto out;
map_fd = bpf_map__fd(prog_array);
if (CHECK_FAIL(map_fd < 0))
goto out;
data_map = bpf_object__find_map_by_name(obj, "tailcall.bss");
if (CHECK_FAIL(!data_map || !bpf_map__is_internal(data_map)))
return;
data_fd = bpf_map__fd(data_map);
if (CHECK_FAIL(map_fd < 0))
return;
for (i = 0; i < bpf_map__def(prog_array)->max_entries; i++) {
snprintf(prog_name, sizeof(prog_name), "classifier/%i", i);
prog = bpf_object__find_program_by_title(obj, prog_name);
if (CHECK_FAIL(!prog))
goto out;
prog_fd = bpf_program__fd(prog);
if (CHECK_FAIL(prog_fd < 0))
goto out;
err = bpf_map_update_elem(map_fd, &i, &prog_fd, BPF_ANY);
if (CHECK_FAIL(err))
goto out;
}
for (i = 0; i < bpf_map__def(prog_array)->max_entries; i++) {
err = bpf_map_update_elem(data_fd, &zero, &key[i], BPF_ANY);
if (CHECK_FAIL(err))
goto out;
err = bpf_prog_test_run(main_fd, 1, buff, sizeof(buff), 0,
&duration, &retval, NULL);
CHECK(err || retval != i, "tailcall",
"err %d errno %d retval %d\n", err, errno, retval);
}
for (i = 0; i < bpf_map__def(prog_array)->max_entries; i++) {
err = bpf_map_update_elem(data_fd, &zero, &key[i], BPF_ANY);
if (CHECK_FAIL(err))
goto out;
err = bpf_map_delete_elem(map_fd, &i);
if (CHECK_FAIL(err))
goto out;
err = bpf_prog_test_run(main_fd, 1, buff, sizeof(buff), 0,
&duration, &retval, NULL);
CHECK(err || retval != 3, "tailcall",
"err %d errno %d retval %d\n", err, errno, retval);
}
out:
bpf_object__close(obj);
}
/* test_tailcall_bpf2bpf_1 purpose is to make sure that tailcalls are working
* correctly in correlation with BPF subprograms
*/
static void test_tailcall_bpf2bpf_1(void)
{
int err, map_fd, prog_fd, main_fd, i;
struct bpf_map *prog_array;
struct bpf_program *prog;
struct bpf_object *obj;
__u32 retval, duration;
char prog_name[32];
err = bpf_prog_load("tailcall_bpf2bpf1.o", BPF_PROG_TYPE_SCHED_CLS,
&obj, &prog_fd);
if (CHECK_FAIL(err))
return;
prog = bpf_object__find_program_by_title(obj, "classifier");
if (CHECK_FAIL(!prog))
goto out;
main_fd = bpf_program__fd(prog);
if (CHECK_FAIL(main_fd < 0))
goto out;
prog_array = bpf_object__find_map_by_name(obj, "jmp_table");
if (CHECK_FAIL(!prog_array))
goto out;
map_fd = bpf_map__fd(prog_array);
if (CHECK_FAIL(map_fd < 0))
goto out;
/* nop -> jmp */
for (i = 0; i < bpf_map__def(prog_array)->max_entries; i++) {
snprintf(prog_name, sizeof(prog_name), "classifier/%i", i);
prog = bpf_object__find_program_by_title(obj, prog_name);
if (CHECK_FAIL(!prog))
goto out;
prog_fd = bpf_program__fd(prog);
if (CHECK_FAIL(prog_fd < 0))
goto out;
err = bpf_map_update_elem(map_fd, &i, &prog_fd, BPF_ANY);
if (CHECK_FAIL(err))
goto out;
}
err = bpf_prog_test_run(main_fd, 1, &pkt_v4, sizeof(pkt_v4), 0,
0, &retval, &duration);
CHECK(err || retval != 1, "tailcall",
"err %d errno %d retval %d\n", err, errno, retval);
/* jmp -> nop, call subprog that will do tailcall */
i = 1;
err = bpf_map_delete_elem(map_fd, &i);
if (CHECK_FAIL(err))
goto out;
err = bpf_prog_test_run(main_fd, 1, &pkt_v4, sizeof(pkt_v4), 0,
0, &retval, &duration);
CHECK(err || retval != 0, "tailcall", "err %d errno %d retval %d\n",
err, errno, retval);
/* make sure that subprog can access ctx and entry prog that
* called this subprog can properly return
*/
i = 0;
err = bpf_map_delete_elem(map_fd, &i);
if (CHECK_FAIL(err))
goto out;
err = bpf_prog_test_run(main_fd, 1, &pkt_v4, sizeof(pkt_v4), 0,
0, &retval, &duration);
CHECK(err || retval != sizeof(pkt_v4) * 2,
"tailcall", "err %d errno %d retval %d\n",
err, errno, retval);
out:
bpf_object__close(obj);
}
/* test_tailcall_bpf2bpf_2 checks that the count value of the tail call limit
* enforcement matches with expectations when tailcall is preceded with
* bpf2bpf call.
*/
static void test_tailcall_bpf2bpf_2(void)
{
int err, map_fd, prog_fd, main_fd, data_fd, i, val;
struct bpf_map *prog_array, *data_map;
struct bpf_program *prog;
struct bpf_object *obj;
__u32 retval, duration;
char buff[128] = {};
err = bpf_prog_load("tailcall_bpf2bpf2.o", BPF_PROG_TYPE_SCHED_CLS,
&obj, &prog_fd);
if (CHECK_FAIL(err))
return;
prog = bpf_object__find_program_by_title(obj, "classifier");
if (CHECK_FAIL(!prog))
goto out;
main_fd = bpf_program__fd(prog);
if (CHECK_FAIL(main_fd < 0))
goto out;
prog_array = bpf_object__find_map_by_name(obj, "jmp_table");
if (CHECK_FAIL(!prog_array))
goto out;
map_fd = bpf_map__fd(prog_array);
if (CHECK_FAIL(map_fd < 0))
goto out;
prog = bpf_object__find_program_by_title(obj, "classifier/0");
if (CHECK_FAIL(!prog))
goto out;
prog_fd = bpf_program__fd(prog);
if (CHECK_FAIL(prog_fd < 0))
goto out;
i = 0;
err = bpf_map_update_elem(map_fd, &i, &prog_fd, BPF_ANY);
if (CHECK_FAIL(err))
goto out;
err = bpf_prog_test_run(main_fd, 1, buff, sizeof(buff), 0,
&duration, &retval, NULL);
CHECK(err || retval != 1, "tailcall", "err %d errno %d retval %d\n",
err, errno, retval);
data_map = bpf_object__find_map_by_name(obj, "tailcall.bss");
if (CHECK_FAIL(!data_map || !bpf_map__is_internal(data_map)))
return;
data_fd = bpf_map__fd(data_map);
if (CHECK_FAIL(map_fd < 0))
return;
i = 0;
err = bpf_map_lookup_elem(data_fd, &i, &val);
CHECK(err || val != 33, "tailcall count", "err %d errno %d count %d\n",
err, errno, val);
i = 0;
err = bpf_map_delete_elem(map_fd, &i);
if (CHECK_FAIL(err))
goto out;
err = bpf_prog_test_run(main_fd, 1, buff, sizeof(buff), 0,
&duration, &retval, NULL);
CHECK(err || retval != 0, "tailcall", "err %d errno %d retval %d\n",
err, errno, retval);
out:
bpf_object__close(obj);
}
/* test_tailcall_bpf2bpf_3 checks that non-trivial amount of stack (up to
* 256 bytes) can be used within bpf subprograms that have the tailcalls
* in them
*/
static void test_tailcall_bpf2bpf_3(void)
{
int err, map_fd, prog_fd, main_fd, i;
struct bpf_map *prog_array;
struct bpf_program *prog;
struct bpf_object *obj;
__u32 retval, duration;
char prog_name[32];
err = bpf_prog_load("tailcall_bpf2bpf3.o", BPF_PROG_TYPE_SCHED_CLS,
&obj, &prog_fd);
if (CHECK_FAIL(err))
return;
prog = bpf_object__find_program_by_title(obj, "classifier");
if (CHECK_FAIL(!prog))
goto out;
main_fd = bpf_program__fd(prog);
if (CHECK_FAIL(main_fd < 0))
goto out;
prog_array = bpf_object__find_map_by_name(obj, "jmp_table");
if (CHECK_FAIL(!prog_array))
goto out;
map_fd = bpf_map__fd(prog_array);
if (CHECK_FAIL(map_fd < 0))
goto out;
for (i = 0; i < bpf_map__def(prog_array)->max_entries; i++) {
snprintf(prog_name, sizeof(prog_name), "classifier/%i", i);
prog = bpf_object__find_program_by_title(obj, prog_name);
if (CHECK_FAIL(!prog))
goto out;
prog_fd = bpf_program__fd(prog);
if (CHECK_FAIL(prog_fd < 0))
goto out;
err = bpf_map_update_elem(map_fd, &i, &prog_fd, BPF_ANY);
if (CHECK_FAIL(err))
goto out;
}
err = bpf_prog_test_run(main_fd, 1, &pkt_v4, sizeof(pkt_v4), 0,
&duration, &retval, NULL);
CHECK(err || retval != sizeof(pkt_v4) * 3,
"tailcall", "err %d errno %d retval %d\n",
err, errno, retval);
i = 1;
err = bpf_map_delete_elem(map_fd, &i);
if (CHECK_FAIL(err))
goto out;
err = bpf_prog_test_run(main_fd, 1, &pkt_v4, sizeof(pkt_v4), 0,
&duration, &retval, NULL);
CHECK(err || retval != sizeof(pkt_v4),
"tailcall", "err %d errno %d retval %d\n",
err, errno, retval);
i = 0;
err = bpf_map_delete_elem(map_fd, &i);
if (CHECK_FAIL(err))
goto out;
err = bpf_prog_test_run(main_fd, 1, &pkt_v4, sizeof(pkt_v4), 0,
&duration, &retval, NULL);
CHECK(err || retval != sizeof(pkt_v4) * 2,
"tailcall", "err %d errno %d retval %d\n",
err, errno, retval);
out:
bpf_object__close(obj);
}
/* test_tailcall_bpf2bpf_4 checks that tailcall counter is correctly preserved
* across tailcalls combined with bpf2bpf calls. for making sure that tailcall
* counter behaves correctly, bpf program will go through following flow:
*
* entry -> entry_subprog -> tailcall0 -> bpf_func0 -> subprog0 ->
* -> tailcall1 -> bpf_func1 -> subprog1 -> tailcall2 -> bpf_func2 ->
* subprog2 [here bump global counter] --------^
*
* We go through first two tailcalls and start counting from the subprog2 where
* the loop begins. At the end of the test make sure that the global counter is
* equal to 31, because tailcall counter includes the first two tailcalls
* whereas global counter is incremented only on loop presented on flow above.
*/
static void test_tailcall_bpf2bpf_4(void)
{
int err, map_fd, prog_fd, main_fd, data_fd, i, val;
struct bpf_map *prog_array, *data_map;
struct bpf_program *prog;
struct bpf_object *obj;
__u32 retval, duration;
char prog_name[32];
err = bpf_prog_load("tailcall_bpf2bpf4.o", BPF_PROG_TYPE_SCHED_CLS,
&obj, &prog_fd);
if (CHECK_FAIL(err))
return;
prog = bpf_object__find_program_by_title(obj, "classifier");
if (CHECK_FAIL(!prog))
goto out;
main_fd = bpf_program__fd(prog);
if (CHECK_FAIL(main_fd < 0))
goto out;
prog_array = bpf_object__find_map_by_name(obj, "jmp_table");
if (CHECK_FAIL(!prog_array))
goto out;
map_fd = bpf_map__fd(prog_array);
if (CHECK_FAIL(map_fd < 0))
goto out;
for (i = 0; i < bpf_map__def(prog_array)->max_entries; i++) {
snprintf(prog_name, sizeof(prog_name), "classifier/%i", i);
prog = bpf_object__find_program_by_title(obj, prog_name);
if (CHECK_FAIL(!prog))
goto out;
prog_fd = bpf_program__fd(prog);
if (CHECK_FAIL(prog_fd < 0))
goto out;
err = bpf_map_update_elem(map_fd, &i, &prog_fd, BPF_ANY);
if (CHECK_FAIL(err))
goto out;
}
err = bpf_prog_test_run(main_fd, 1, &pkt_v4, sizeof(pkt_v4), 0,
&duration, &retval, NULL);
CHECK(err || retval != sizeof(pkt_v4) * 3, "tailcall", "err %d errno %d retval %d\n",
err, errno, retval);
data_map = bpf_object__find_map_by_name(obj, "tailcall.bss");
if (CHECK_FAIL(!data_map || !bpf_map__is_internal(data_map)))
return;
data_fd = bpf_map__fd(data_map);
if (CHECK_FAIL(map_fd < 0))
return;
i = 0;
err = bpf_map_lookup_elem(data_fd, &i, &val);
CHECK(err || val != 31, "tailcall count", "err %d errno %d count %d\n",
err, errno, val);
out:
bpf_object__close(obj);
}
void test_tailcalls(void)
{
if (test__start_subtest("tailcall_1"))
test_tailcall_1();
if (test__start_subtest("tailcall_2"))
test_tailcall_2();
if (test__start_subtest("tailcall_3"))
test_tailcall_3();
if (test__start_subtest("tailcall_4"))
test_tailcall_4();
if (test__start_subtest("tailcall_5"))
test_tailcall_5();
if (test__start_subtest("tailcall_bpf2bpf_1"))
test_tailcall_bpf2bpf_1();
if (test__start_subtest("tailcall_bpf2bpf_2"))
test_tailcall_bpf2bpf_2();
if (test__start_subtest("tailcall_bpf2bpf_3"))
test_tailcall_bpf2bpf_3();
if (test__start_subtest("tailcall_bpf2bpf_4"))
test_tailcall_bpf2bpf_4();
}
Reference in a new issue View git blame Copy permalink