[PATCH bpf-next v5 3/3] selftests/bpf: Test stack depth stats without BTF subprog names

[Kumar Kartikeya Dwivedi <memxor@gmail.com>]

Test the per-program instruction and stack depth statistics emitted when BTF
function info does not provide subprogram names.

Make VERBOSE_ACCEPT request verifier statistics so the raw-insn test can
validate the <unknown> output without a test-specific log level.

Signed-off-by: Kumar Kartikeya Dwivedi <memxor@gmail.com>
---
 tools/testing/selftests/bpf/test_verifier.c  | 2 +-
 tools/testing/selftests/bpf/verifier/calls.c | 9 ++++++++-
 2 files changed, 9 insertions(+), 2 deletions(-)

diff --git a/tools/testing/selftests/bpf/test_verifier.c b/tools/testing/selftests/bpf/test_verifier.c
index a8ae03c57bba..bffb7360434c 100644
--- a/tools/testing/selftests/bpf/test_verifier.c
+++ b/tools/testing/selftests/bpf/test_verifier.c
@@ -1560,7 +1560,7 @@ static void do_test_single(struct bpf_test *test, bool unpriv,
 
 	opts.expected_attach_type = test->expected_attach_type;
 	if (expected_ret == VERBOSE_ACCEPT)
-		opts.log_level = 2;
+		opts.log_level = 2 | 4;
 	else if (verbose)
 		opts.log_level = verif_log_level | 4; /* force stats */
 	else
diff --git a/tools/testing/selftests/bpf/verifier/calls.c b/tools/testing/selftests/bpf/verifier/calls.c
index 8cd626e04551..6bf9ca5c5600 100644
--- a/tools/testing/selftests/bpf/verifier/calls.c
+++ b/tools/testing/selftests/bpf/verifier/calls.c
@@ -1091,7 +1091,14 @@
 	/* stack_main=32, stack_A=256, stack_B=64
 	 * and max(main+A, main+A+B) < 512
 	 */
-	.result = ACCEPT,
+	.result = VERBOSE_ACCEPT,
+	.errstr = "stack depth max 352\t"
+		  "prog (<unknown>) insns \t"
+		  " stack 32\t"
+		  "subprog 1 (<unknown>) insns \t"
+		  " stack 256\t"
+		  "subprog 2 (<unknown>) insns \t"
+		  " stack 64",
 },
 {
 	"calls: stack depth check using three frames. test2",
-- 
2.53.0