selftests/bpf: test_progs: test__skip

Export test__skip() to indicate skipped tests and use it in
test_send_signal_nmi().

Cc: Andrii Nakryiko <andriin@fb.com>
Signed-off-by: Stanislav Fomichev <sdf@google.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>

tools/testing/selftests/bpf/prog_tests/send_signal.c

@@ -204,6 +204,7 @@ static int test_send_signal_nmi(void)
 		if (errno == ENOENT) {
 			printf("%s:SKIP:no PERF_COUNT_HW_CPU_CYCLES\n",
 			       __func__);
+			test__skip();
 			return 0;
 		}
 		/* Let the test fail with a more informative message */

tools/testing/selftests/bpf/test_progs.c

@@ -17,6 +17,7 @@ struct prog_test_def {
 	bool force_log;
 	int pass_cnt;
 	int error_cnt;
+	int skip_cnt;
 	bool tested;
 
 	const char *subtest_name;
@@ -56,6 +57,14 @@ static void dump_test_log(const struct prog_test_def *test, bool failed)
 	fseeko(stdout, 0, SEEK_SET); /* rewind */
 }
 
+static void skip_account(void)
+{
+	if (env.test->skip_cnt) {
+		env.skip_cnt++;
+		env.test->skip_cnt = 0;
+	}
+}
+
 void test__end_subtest()
 {
 	struct prog_test_def *test = env.test;
@@ -65,6 +74,7 @@ void test__end_subtest()
 		env.fail_cnt++;
 	else
 		env.sub_succ_cnt++;
+	skip_account();
 
 	dump_test_log(test, sub_error_cnt);
 
@@ -105,6 +115,11 @@ void test__force_log() {
 	env.test->force_log = true;
 }
 
+void test__skip(void)
+{
+	env.test->skip_cnt++;
+}
+
 struct ipv4_packet pkt_v4 = {
 	.eth.h_proto = __bpf_constant_htons(ETH_P_IP),
 	.iph.ihl = 5,
@@ -510,6 +525,7 @@ int main(int argc, char **argv)
 			env.fail_cnt++;
 		else
 			env.succ_cnt++;
+		skip_account();
 
 		dump_test_log(test, test->error_cnt);
 
@@ -518,8 +534,8 @@ int main(int argc, char **argv)
 			test->error_cnt ? "FAIL" : "OK");
 	}
 	stdio_restore();
-	printf("Summary: %d/%d PASSED, %d FAILED\n",
-	       env.succ_cnt, env.sub_succ_cnt, env.fail_cnt);
+	printf("Summary: %d/%d PASSED, %d SKIPPED, %d FAILED\n",
+	       env.succ_cnt, env.sub_succ_cnt, env.skip_cnt, env.fail_cnt);
 
 	free(env.test_selector.num_set);
 	free(env.subtest_selector.num_set);

tools/testing/selftests/bpf/test_progs.h

@@ -64,6 +64,7 @@ struct test_env {
 	int succ_cnt; /* successful tests */
 	int sub_succ_cnt; /* successful sub-tests */
 	int fail_cnt; /* total failed tests + sub-tests */
+	int skip_cnt; /* skipped tests */
 };
 
 extern int error_cnt;
@@ -72,6 +73,7 @@ extern struct test_env env;
 
 extern void test__force_log();
 extern bool test__start_subtest(const char *name);
+extern void test__skip(void);
 
 #define MAGIC_BYTES 123