1 files changed, 62 insertions, 4 deletions

diff --git a/tools/testing/selftests/bpf/test_progs.c b/tools/testing/selftests/bpf/test_progs.c
index 54fa5fa688ce..b1e4dadacd9b 100644
--- a/tools/testing/selftests/bpf/test_progs.c
+++ b/tools/testing/selftests/bpf/test_progs.c
@@ -12,6 +12,9 @@
 #include <string.h>
 #include <execinfo.h> /* backtrace */
 
+#define EXIT_NO_TEST		2
+#define EXIT_ERR_SETUP_INFRA	3
+
 /* defined in test_progs.h */
 struct test_env env = {};
 
@@ -111,13 +114,31 @@ static void reset_affinity() {
 	if (err < 0) {
 		stdio_restore();
 		fprintf(stderr, "Failed to reset process affinity: %d!\n", err);
-		exit(-1);
+		exit(EXIT_ERR_SETUP_INFRA);
 	}
 	err = pthread_setaffinity_np(pthread_self(), sizeof(cpuset), &cpuset);
 	if (err < 0) {
 		stdio_restore();
 		fprintf(stderr, "Failed to reset thread affinity: %d!\n", err);
-		exit(-1);
+		exit(EXIT_ERR_SETUP_INFRA);
+	}
+}
+
+static void save_netns(void)
+{
+	env.saved_netns_fd = open("/proc/self/ns/net", O_RDONLY);
+	if (env.saved_netns_fd == -1) {
+		perror("open(/proc/self/ns/net)");
+		exit(EXIT_ERR_SETUP_INFRA);
+	}
+}
+
+static void restore_netns(void)
+{
+	if (setns(env.saved_netns_fd, CLONE_NEWNET) == -1) {
+		stdio_restore();
+		perror("setns(CLONE_NEWNS)");
+		exit(EXIT_ERR_SETUP_INFRA);
 	}
 }
 
@@ -138,8 +159,6 @@ void test__end_subtest()
 	       test->test_num, test->subtest_num,
 	       test->subtest_name, sub_error_cnt ? "FAIL" : "OK");
 
-	reset_affinity();
-
 	free(test->subtest_name);
 	test->subtest_name = NULL;
 }
@@ -366,6 +385,8 @@ enum ARG_KEYS {
 	ARG_TEST_NAME_BLACKLIST = 'b',
 	ARG_VERIFIER_STATS = 's',
 	ARG_VERBOSE = 'v',
+	ARG_GET_TEST_CNT = 'c',
+	ARG_LIST_TEST_NAMES = 'l',
 };
 
 static const struct argp_option opts[] = {
@@ -379,6 +400,10 @@ static const struct argp_option opts[] = {
 	  "Output verifier statistics", },
 	{ "verbose", ARG_VERBOSE, "LEVEL", OPTION_ARG_OPTIONAL,
 	  "Verbose output (use -vv or -vvv for progressively verbose output)" },
+	{ "count", ARG_GET_TEST_CNT, NULL, 0,
+	  "Get number of selected top-level tests " },
+	{ "list", ARG_LIST_TEST_NAMES, NULL, 0,
+	  "List test names that would run (without running them) " },
 	{},
 };
 
@@ -511,6 +536,12 @@ static error_t parse_arg(int key, char *arg, struct argp_state *state)
 			}
 		}
 		break;
+	case ARG_GET_TEST_CNT:
+		env->get_test_cnt = true;
+		break;
+	case ARG_LIST_TEST_NAMES:
+		env->list_test_names = true;
+		break;
 	case ARGP_KEY_ARG:
 		argp_usage(state);
 		break;
@@ -643,6 +674,7 @@ int main(int argc, char **argv)
 		return -1;
 	}
 
+	save_netns();
 	stdio_hijack();
 	for (i = 0; i < prog_test_cnt; i++) {
 		struct prog_test_def *test = &prog_test_defs[i];
@@ -654,6 +686,17 @@ int main(int argc, char **argv)
 				test->test_num, test->test_name))
 			continue;
 
+		if (env.get_test_cnt) {
+			env.succ_cnt++;
+			continue;
+		}
+
+		if (env.list_test_names) {
+			fprintf(env.stdout, "%s\n", test->test_name);
+			env.succ_cnt++;
+			continue;
+		}
+
 		test->run_test();
 		/* ensure last sub-test is finalized properly */
 		if (test->subtest_name)
@@ -673,19 +716,34 @@ int main(int argc, char **argv)
 			test->error_cnt ? "FAIL" : "OK");
 
 		reset_affinity();
+		restore_netns();
 		if (test->need_cgroup_cleanup)
 			cleanup_cgroup_environment();
 	}
 	stdio_restore();
+
+	if (env.get_test_cnt) {
+		printf("%d\n", env.succ_cnt);
+		goto out;
+	}
+
+	if (env.list_test_names)
+		goto out;
+
 	fprintf(stdout, "Summary: %d/%d PASSED, %d SKIPPED, %d FAILED\n",
 		env.succ_cnt, env.sub_succ_cnt, env.skip_cnt, env.fail_cnt);
 
+out:
 	free_str_set(&env.test_selector.blacklist);
 	free_str_set(&env.test_selector.whitelist);
 	free(env.test_selector.num_set);
 	free_str_set(&env.subtest_selector.blacklist);
 	free_str_set(&env.subtest_selector.whitelist);
 	free(env.subtest_selector.num_set);
+	close(env.saved_netns_fd);
+
+	if (env.succ_cnt + env.fail_cnt + env.skip_cnt == 0)
+		return EXIT_NO_TEST;
 
 	return env.fail_cnt ? EXIT_FAILURE : EXIT_SUCCESS;
 }