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selftests/bpf: Test may_goto

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Add tests for may_goto instruction via cond_break macro.

Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Acked-by: John Fastabend <john.fastabend@gmail.com>
Tested-by: John Fastabend <john.fastabend@gmail.com>
Link: https://lore.kernel.org/bpf/20240306031929.42666-5-alexei.starovoitov@gmail.com
This commit is contained in:
Alexei Starovoitov 2024-03-05 19:19:29 -08:00 committed by Andrii Nakryiko
parent 0637580152
commit 0c8bbf990b
2 changed files with 101 additions and 3 deletions
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1
tools/testing/selftests/bpf/DENYLIST.s390x
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@ -3,3 +3,4 @@
exceptions # JIT does not support calling kfunc bpf_throw (exceptions)
get_stack_raw_tp # user_stack corrupted user stack (no backchain userspace)
stacktrace_build_id # compare_map_keys stackid_hmap vs. stackmap err -2 errno 2 (?)
verifier_iterating_callbacks

103
tools/testing/selftests/bpf/progs/verifier_iterating_callbacks.c
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@ -1,8 +1,6 @@
// SPDX-License-Identifier: GPL-2.0
#include <linux/bpf.h>
#include <bpf/bpf_helpers.h>
#include "bpf_misc.h"
#include "bpf_experimental.h"
struct {
__uint(type, BPF_MAP_TYPE_ARRAY);
@ -239,4 +237,103 @@ int bpf_loop_iter_limit_nested(void *unused)
return 1000 * a + b + c;
}
#define ARR_SZ 1000000
int zero;
char arr[ARR_SZ];
SEC("socket")
__success __retval(0xd495cdc0)
int cond_break1(const void *ctx)
{
unsigned long i;
unsigned int sum = 0;
for (i = zero; i < ARR_SZ; cond_break, i++)
sum += i;
for (i = zero; i < ARR_SZ; i++) {
barrier_var(i);
sum += i + arr[i];
cond_break;
}
return sum;
}
SEC("socket")
__success __retval(999000000)
int cond_break2(const void *ctx)
{
int i, j;
int sum = 0;
for (i = zero; i < 1000; cond_break, i++)
for (j = zero; j < 1000; j++) {
sum += i + j;
cond_break;
}
return sum;
}
static __noinline int loop(void)
{
int i, sum = 0;
for (i = zero; i <= 1000000; i++, cond_break)
sum += i;
return sum;
}
SEC("socket")
__success __retval(0x6a5a2920)
int cond_break3(const void *ctx)
{
return loop();
}
SEC("socket")
__success __retval(1)
int cond_break4(const void *ctx)
{
int cnt = zero;
for (;;) {
/* should eventually break out of the loop */
cond_break;
cnt++;
}
/* if we looped a bit, it's a success */
return cnt > 1 ? 1 : 0;
}
static __noinline int static_subprog(void)
{
int cnt = zero;
for (;;) {
cond_break;
cnt++;
}
return cnt;
}
SEC("socket")
__success __retval(1)
int cond_break5(const void *ctx)
{
int cnt1 = zero, cnt2;
for (;;) {
cond_break;
cnt1++;
}
cnt2 = static_subprog();
/* main and subprog have to loop a bit */
return cnt1 > 1 && cnt2 > 1 ? 1 : 0;
}
char _license[] SEC("license") = "GPL";