selftests/bpf: Add the traffic monitor option to test_progs.

Add option '-m' to test_progs to accept names and patterns of test cases.
This option will be used later to enable traffic monitor that capture
network packets generated by test cases.
Acked-by: Stanislav Fomichev <sdf@fomichev.me>
Signed-off-by: Kui-Feng Lee <thinker.li@gmail.com>
Link: https://lore.kernel.org/r/20240815053254.470944-3-thinker.li@gmail.comSigned-off-by: Martin KaFai Lau <martin.lau@kernel.org>

tools/testing/selftests/bpf/test_progs.c

@@ -155,6 +155,7 @@ struct prog_test_def {
 	void (*run_serial_test)(void);
 	bool should_run;
 	bool need_cgroup_cleanup;
+	bool should_tmon;
 };
 
 /* Override C runtime library's usleep() implementation to ensure nanosleep()
@@ -192,39 +193,39 @@ static bool should_run(struct test_selector *sel, int num, const char *name)
 	return num < sel->num_set_len && sel->num_set[num];
 }
 
-static bool should_run_subtest(struct test_selector *sel,
-			       struct test_selector *subtest_sel,
-			       int subtest_num,
+static bool match_subtest(struct test_filter_set *filter,
 			  const char *test_name,
 			  const char *subtest_name)
 {
 	int i, j;
 
-	for (i = 0; i < sel->blacklist.cnt; i++) {
-		if (glob_match(test_name, sel->blacklist.tests[i].name)) {
-			if (!sel->blacklist.tests[i].subtest_cnt)
-				return false;
+	for (i = 0; i < filter->cnt; i++) {
+		if (glob_match(test_name, filter->tests[i].name)) {
+			if (!filter->tests[i].subtest_cnt)
+				return true;
 
-			for (j = 0; j < sel->blacklist.tests[i].subtest_cnt; j++) {
+			for (j = 0; j < filter->tests[i].subtest_cnt; j++) {
 				if (glob_match(subtest_name,
-					       sel->blacklist.tests[i].subtests[j]))
-					return false;
+					       filter->tests[i].subtests[j]))
+					return true;
 			}
 		}
 	}
 
-	for (i = 0; i < sel->whitelist.cnt; i++) {
-		if (glob_match(test_name, sel->whitelist.tests[i].name)) {
-			if (!sel->whitelist.tests[i].subtest_cnt)
-				return true;
+	return false;
+}
 
-			for (j = 0; j < sel->whitelist.tests[i].subtest_cnt; j++) {
-				if (glob_match(subtest_name,
-					       sel->whitelist.tests[i].subtests[j]))
+static bool should_run_subtest(struct test_selector *sel,
+			       struct test_selector *subtest_sel,
+			       int subtest_num,
+			       const char *test_name,
+			       const char *subtest_name)
+{
+	if (match_subtest(&sel->blacklist, test_name, subtest_name))
+		return false;
+
+	if (match_subtest(&sel->whitelist, test_name, subtest_name))
 		return true;
-			}
-		}
-	}
 
 	if (!sel->whitelist.cnt && !subtest_sel->num_set)
 		return true;
@@ -232,6 +233,19 @@ static bool should_run_subtest(struct test_selector *sel,
 	return subtest_num < subtest_sel->num_set_len && subtest_sel->num_set[subtest_num];
 }
 
+static bool should_tmon(struct test_selector *sel, const char *name)
+{
+	int i;
+
+	for (i = 0; i < sel->whitelist.cnt; i++) {
+		if (glob_match(name, sel->whitelist.tests[i].name) &&
+		    !sel->whitelist.tests[i].subtest_cnt)
+			return true;
+	}
+
+	return false;
+}
+
 static char *test_result(bool failed, bool skipped)
 {
 	return failed ? "FAIL" : (skipped ? "SKIP" : "OK");
@@ -488,6 +502,10 @@ bool test__start_subtest(const char *subtest_name)
 		return false;
 	}
 
+	subtest_state->should_tmon = match_subtest(&env.tmon_selector.whitelist,
+						   test->test_name,
+						   subtest_name);
+
 	env.subtest_state = subtest_state;
 	stdio_hijack_init(&subtest_state->log_buf, &subtest_state->log_cnt);
 
@@ -667,7 +685,8 @@ enum ARG_KEYS {
 	ARG_TEST_NAME_GLOB_DENYLIST = 'd',
 	ARG_NUM_WORKERS = 'j',
 	ARG_DEBUG = -1,
-	ARG_JSON_SUMMARY = 'J'
+	ARG_JSON_SUMMARY = 'J',
+	ARG_TRAFFIC_MONITOR = 'm',
 };
 
 static const struct argp_option opts[] = {
@@ -694,6 +713,10 @@ static const struct argp_option opts[] = {
 	{ "debug", ARG_DEBUG, NULL, 0,
 	  "print extra debug information for test_progs." },
 	{ "json-summary", ARG_JSON_SUMMARY, "FILE", 0, "Write report in json format to this file."},
+#ifdef TRAFFIC_MONITOR
+	{ "traffic-monitor", ARG_TRAFFIC_MONITOR, "NAMES", 0,
+	  "Monitor network traffic of tests with name matching the pattern (supports '*' wildcard)." },
+#endif
 	{},
 };
 
@@ -905,6 +928,18 @@ static error_t parse_arg(int key, char *arg, struct argp_state *state)
 		break;
 	case ARGP_KEY_END:
 		break;
+#ifdef TRAFFIC_MONITOR
+	case ARG_TRAFFIC_MONITOR:
+		if (arg[0] == '@')
+			err = parse_test_list_file(arg + 1,
+						   &env->tmon_selector.whitelist,
+						   true);
+		else
+			err = parse_test_list(arg,
+					      &env->tmon_selector.whitelist,
+					      true);
+		break;
+#endif
 	default:
 		return ARGP_ERR_UNKNOWN;
 	}
@@ -1736,6 +1771,8 @@ int main(int argc, char **argv)
 				test->test_num, test->test_name, test->test_name, test->test_name);
 			exit(EXIT_ERR_SETUP_INFRA);
 		}
+		if (test->should_run)
+			test->should_tmon = should_tmon(&env.tmon_selector, test->test_name);
 	}
 
 	/* ignore workers if we are just listing */
@@ -1820,6 +1857,7 @@ int main(int argc, char **argv)
 
 	free_test_selector(&env.test_selector);
 	free_test_selector(&env.subtest_selector);
+	free_test_selector(&env.tmon_selector);
 	free_test_states();
 
 	if (env.succ_cnt + env.fail_cnt + env.skip_cnt == 0)

tools/testing/selftests/bpf/test_progs.h

@@ -74,6 +74,7 @@ struct subtest_state {
 	int error_cnt;
 	bool skipped;
 	bool filtered;
+	bool should_tmon;
 
 	FILE *stdout_saved;
 };
@@ -98,6 +99,7 @@ struct test_state {
 struct test_env {
 	struct test_selector test_selector;
 	struct test_selector subtest_selector;
+	struct test_selector tmon_selector;
 	bool verifier_stats;
 	bool debug;
 	enum verbosity verbosity;