Merge branch 'Parallelize verif_scale selftests'

Andrii Nakryiko says:

====================

Reduce amount of waiting time when running test_progs in parallel mode (-j) by
splitting bpf_verif_scale selftests into multiple tests. Previously it was
structured as a test with multiple subtests, but subtests are not easily
parallelizable with test_progs' infra. Also in practice each scale subtest is
really an independent test with nothing shared across all substest.

This patch set changes how test_progs test discovery works. Now it is possible
to define multiple tests within a single source code file. One of the patches
also marks tc_redirect selftests as serial, because it's extremely harmful to
the test system when run in parallel mode.
====================
Acked-by: Yucong Sun <sunyucong@gmail.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>

tools/testing/selftests/bpf/Makefile

@@ -421,10 +421,9 @@ ifeq ($($(TRUNNER_TESTS_DIR)-tests-hdr),)
 $(TRUNNER_TESTS_DIR)-tests-hdr := y
 $(TRUNNER_TESTS_HDR): $(TRUNNER_TESTS_DIR)/*.c
 	$$(call msg,TEST-HDR,$(TRUNNER_BINARY),$$@)
-	$$(shell ( cd $(TRUNNER_TESTS_DIR);				\
-		  echo '/* Generated header, do not edit */';		\
-		  ls *.c 2> /dev/null |					\
-			sed -e 's@\([^\.]*\)\.c@DEFINE_TEST(\1)@';	\
+	$$(shell (echo '/* Generated header, do not edit */';					\
+		  sed -n -E 's/^void (serial_)?test_([a-zA-Z0-9_]+)\((void)?\).*/DEFINE_TEST(\2)/p'	\
+			$(TRUNNER_TESTS_DIR)/*.c | sort ;	\
 		 ) > $$@)
 endif
 

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

@@ -39,82 +39,166 @@ struct scale_test_def {
 	bool fails;
 };
 
-void test_bpf_verif_scale(void)
+static void scale_test(const char *file,
+		       enum bpf_prog_type attach_type,
+		       bool should_fail)
 {
-	struct scale_test_def tests[] = {
-		{ "loop3.o", BPF_PROG_TYPE_RAW_TRACEPOINT, true /* fails */ },
+	libbpf_print_fn_t old_print_fn = NULL;
+	int err;
+
+	if (env.verifier_stats) {
+		test__force_log();
+		old_print_fn = libbpf_set_print(libbpf_debug_print);
+	}
+
+	err = check_load(file, attach_type);
+	if (should_fail)
+		ASSERT_ERR(err, "expect_error");
+	else
+		ASSERT_OK(err, "expect_success");
+
+	if (env.verifier_stats)
+		libbpf_set_print(old_print_fn);
+}
+
+void test_verif_scale1()
+{
+	scale_test("test_verif_scale1.o", BPF_PROG_TYPE_SCHED_CLS, false);
+}
+
+void test_verif_scale2()
+{
+	scale_test("test_verif_scale2.o", BPF_PROG_TYPE_SCHED_CLS, false);
+}
+
+void test_verif_scale3()
+{
+	scale_test("test_verif_scale3.o", BPF_PROG_TYPE_SCHED_CLS, false);
+}
+
+void test_verif_scale_pyperf_global()
+{
+	scale_test("pyperf_global.o", BPF_PROG_TYPE_RAW_TRACEPOINT, false);
+}
 
-		{ "test_verif_scale1.o", BPF_PROG_TYPE_SCHED_CLS },
-		{ "test_verif_scale2.o", BPF_PROG_TYPE_SCHED_CLS },
-		{ "test_verif_scale3.o", BPF_PROG_TYPE_SCHED_CLS },
+void test_verif_scale_pyperf_subprogs()
+{
+	scale_test("pyperf_subprogs.o", BPF_PROG_TYPE_RAW_TRACEPOINT, false);
+}
 
-		{ "pyperf_global.o", BPF_PROG_TYPE_RAW_TRACEPOINT },
-		{ "pyperf_subprogs.o", BPF_PROG_TYPE_RAW_TRACEPOINT },
+void test_verif_scale_pyperf50()
+{
+	/* full unroll by llvm */
+	scale_test("pyperf50.o", BPF_PROG_TYPE_RAW_TRACEPOINT, false);
+}
 
+void test_verif_scale_pyperf100()
+{
 	/* full unroll by llvm */
-		{ "pyperf50.o", BPF_PROG_TYPE_RAW_TRACEPOINT },
-		{ "pyperf100.o", BPF_PROG_TYPE_RAW_TRACEPOINT },
-		{ "pyperf180.o", BPF_PROG_TYPE_RAW_TRACEPOINT },
+	scale_test("pyperf100.o", BPF_PROG_TYPE_RAW_TRACEPOINT, false);
+}
 
+void test_verif_scale_pyperf180()
+{
+	/* full unroll by llvm */
+	scale_test("pyperf180.o", BPF_PROG_TYPE_RAW_TRACEPOINT, false);
+}
+
+void test_verif_scale_pyperf600()
+{
 	/* partial unroll. llvm will unroll loop ~150 times.
 	 * C loop count -> 600.
 	 * Asm loop count -> 4.
 	 * 16k insns in loop body.
 	 * Total of 5 such loops. Total program size ~82k insns.
 	 */
-		{ "pyperf600.o", BPF_PROG_TYPE_RAW_TRACEPOINT },
+	scale_test("pyperf600.o", BPF_PROG_TYPE_RAW_TRACEPOINT, false);
+}
 
+void test_verif_scale_pyperf600_nounroll()
+{
 	/* no unroll at all.
 	 * C loop count -> 600.
 	 * ASM loop count -> 600.
 	 * ~110 insns in loop body.
 	 * Total of 5 such loops. Total program size ~1500 insns.
 	 */
-		{ "pyperf600_nounroll.o", BPF_PROG_TYPE_RAW_TRACEPOINT },
+	scale_test("pyperf600_nounroll.o", BPF_PROG_TYPE_RAW_TRACEPOINT, false);
+}
 
-		{ "loop1.o", BPF_PROG_TYPE_RAW_TRACEPOINT },
-		{ "loop2.o", BPF_PROG_TYPE_RAW_TRACEPOINT },
-		{ "loop4.o", BPF_PROG_TYPE_SCHED_CLS },
-		{ "loop5.o", BPF_PROG_TYPE_SCHED_CLS },
-		{ "loop6.o", BPF_PROG_TYPE_KPROBE },
+void test_verif_scale_loop1()
+{
+	scale_test("loop1.o", BPF_PROG_TYPE_RAW_TRACEPOINT, false);
+}
 
+void test_verif_scale_loop2()
+{
+	scale_test("loop2.o", BPF_PROG_TYPE_RAW_TRACEPOINT, false);
+}
+
+void test_verif_scale_loop3_fail()
+{
+	scale_test("loop3.o", BPF_PROG_TYPE_RAW_TRACEPOINT, true /* fails */);
+}
+
+void test_verif_scale_loop4()
+{
+	scale_test("loop4.o", BPF_PROG_TYPE_SCHED_CLS, false);
+}
+
+void test_verif_scale_loop5()
+{
+	scale_test("loop5.o", BPF_PROG_TYPE_SCHED_CLS, false);
+}
+
+void test_verif_scale_loop6()
+{
+	scale_test("loop6.o", BPF_PROG_TYPE_KPROBE, false);
+}
+
+void test_verif_scale_strobemeta()
+{
 	/* partial unroll. 19k insn in a loop.
 	 * Total program size 20.8k insn.
 	 * ~350k processed_insns
 	 */
-		{ "strobemeta.o", BPF_PROG_TYPE_RAW_TRACEPOINT },
+	scale_test("strobemeta.o", BPF_PROG_TYPE_RAW_TRACEPOINT, false);
+}
 
+void test_verif_scale_strobemeta_nounroll1()
+{
 	/* no unroll, tiny loops */
-		{ "strobemeta_nounroll1.o", BPF_PROG_TYPE_RAW_TRACEPOINT },
-		{ "strobemeta_nounroll2.o", BPF_PROG_TYPE_RAW_TRACEPOINT },
-
-		/* non-inlined subprogs */
-		{ "strobemeta_subprogs.o", BPF_PROG_TYPE_RAW_TRACEPOINT },
-
-		{ "test_sysctl_loop1.o", BPF_PROG_TYPE_CGROUP_SYSCTL },
-		{ "test_sysctl_loop2.o", BPF_PROG_TYPE_CGROUP_SYSCTL },
+	scale_test("strobemeta_nounroll1.o", BPF_PROG_TYPE_RAW_TRACEPOINT, false);
+}
 
-		{ "test_xdp_loop.o", BPF_PROG_TYPE_XDP },
-		{ "test_seg6_loop.o", BPF_PROG_TYPE_LWT_SEG6LOCAL },
-	};
-	libbpf_print_fn_t old_print_fn = NULL;
-	int err, i;
+void test_verif_scale_strobemeta_nounroll2()
+{
+	/* no unroll, tiny loops */
+	scale_test("strobemeta_nounroll2.o", BPF_PROG_TYPE_RAW_TRACEPOINT, false);
+}
 
-	if (env.verifier_stats) {
-		test__force_log();
-		old_print_fn = libbpf_set_print(libbpf_debug_print);
-	}
+void test_verif_scale_strobemeta_subprogs()
+{
+	/* non-inlined subprogs */
+	scale_test("strobemeta_subprogs.o", BPF_PROG_TYPE_RAW_TRACEPOINT, false);
+}
 
-	for (i = 0; i < ARRAY_SIZE(tests); i++) {
-		const struct scale_test_def *test = &tests[i];
+void test_verif_scale_sysctl_loop1()
+{
+	scale_test("test_sysctl_loop1.o", BPF_PROG_TYPE_CGROUP_SYSCTL, false);
+}
 
-		if (!test__start_subtest(test->file))
-			continue;
+void test_verif_scale_sysctl_loop2()
+{
+	scale_test("test_sysctl_loop2.o", BPF_PROG_TYPE_CGROUP_SYSCTL, false);
+}
 
-		err = check_load(test->file, test->attach_type);
-		CHECK_FAIL(err && !test->fails);
-	}
+void test_verif_scale_xdp_loop()
+{
+	scale_test("test_xdp_loop.o", BPF_PROG_TYPE_XDP, false);
+}
 
-	if (env.verifier_stats)
-		libbpf_set_print(old_print_fn);
+void test_verif_scale_seg6_loop()
+{
+	scale_test("test_seg6_loop.o", BPF_PROG_TYPE_LWT_SEG6LOCAL, false);
 }

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

@@ -133,7 +133,7 @@ static char *dump_buf;
 static size_t dump_buf_sz;
 static FILE *dump_buf_file;
 
-void test_btf_dump_incremental(void)
+static void test_btf_dump_incremental(void)
 {
 	struct btf *btf = NULL;
 	struct btf_dump *d = NULL;

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

@@ -117,14 +117,14 @@ static int resolve_symbols(void)
 	return 0;
 }
 
-int test_resolve_btfids(void)
+void test_resolve_btfids(void)
 {
 	__u32 *test_list, *test_lists[] = { test_list_local, test_list_global };
 	unsigned int i, j;
 	int ret = 0;
 
 	if (resolve_symbols())
-		return -1;
+		return;
 
 	/* Check BTF_ID_LIST(test_list_local) and
 	 * BTF_ID_LIST_GLOBAL(test_list_global) IDs
@@ -138,7 +138,7 @@ int test_resolve_btfids(void)
 				    test_symbols[i].name,
 				    test_list[i], test_symbols[i].id);
 			if (ret)
-				return ret;
+				return;
 		}
 	}
 
@@ -161,9 +161,7 @@ int test_resolve_btfids(void)
 
 		if (i > 0) {
 			if (!ASSERT_LE(test_set.ids[i - 1], test_set.ids[i], "sort_check"))
-				return -1;
+				return;
 		}
 	}
-
-	return ret;
 }

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

@@ -42,7 +42,7 @@ static void test_signal_pending_by_type(enum bpf_prog_type prog_type)
 	signal(SIGALRM, SIG_DFL);
 }
 
-void test_signal_pending(enum bpf_prog_type prog_type)
+void test_signal_pending(void)
 {
 	test_signal_pending_by_type(BPF_PROG_TYPE_SOCKET_FILTER);
 	test_signal_pending_by_type(BPF_PROG_TYPE_FLOW_DISSECTOR);

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

@@ -33,7 +33,7 @@
 
 #define EXP_NO_BUF_RET 29
 
-void test_snprintf_positive(void)
+static void test_snprintf_positive(void)
 {
 	char exp_addr_out[] = EXP_ADDR_OUT;
 	char exp_sym_out[]  = EXP_SYM_OUT;
@@ -103,7 +103,7 @@ static int load_single_snprintf(char *fmt)
 	return ret;
 }
 
-void test_snprintf_negative(void)
+static void test_snprintf_negative(void)
 {
 	ASSERT_OK(load_single_snprintf("valid %d"), "valid usage");
 

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

@@ -769,7 +769,7 @@ static void *test_tc_redirect_run_tests(void *arg)
 	return NULL;
 }
 
-void test_tc_redirect(void)
+void serial_test_tc_redirect(void)
 {
 	pthread_t test_thread;
 	int err;

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

@@ -2,7 +2,7 @@
 #include <test_progs.h>
 #include <network_helpers.h>
 
-void test_xdp_adjust_tail_shrink(void)
+static void test_xdp_adjust_tail_shrink(void)
 {
 	const char *file = "./test_xdp_adjust_tail_shrink.o";
 	__u32 duration, retval, size, expect_sz;
@@ -30,7 +30,7 @@ void test_xdp_adjust_tail_shrink(void)
 	bpf_object__close(obj);
 }
 
-void test_xdp_adjust_tail_grow(void)
+static void test_xdp_adjust_tail_grow(void)
 {
 	const char *file = "./test_xdp_adjust_tail_grow.o";
 	struct bpf_object *obj;
@@ -58,7 +58,7 @@ void test_xdp_adjust_tail_grow(void)
 	bpf_object__close(obj);
 }
 
-void test_xdp_adjust_tail_grow2(void)
+static void test_xdp_adjust_tail_grow2(void)
 {
 	const char *file = "./test_xdp_adjust_tail_grow.o";
 	char buf[4096]; /* avoid segfault: large buf to hold grow results */

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

@@ -8,7 +8,7 @@
 
 #define IFINDEX_LO 1
 
-void test_xdp_with_devmap_helpers(void)
+static void test_xdp_with_devmap_helpers(void)
 {
 	struct test_xdp_with_devmap_helpers *skel;
 	struct bpf_prog_info info = {};
@@ -60,7 +60,7 @@ void test_xdp_with_devmap_helpers(void)
 	test_xdp_with_devmap_helpers__destroy(skel);
 }
 
-void test_neg_xdp_devmap_helpers(void)
+static void test_neg_xdp_devmap_helpers(void)
 {
 	struct test_xdp_devmap_helpers *skel;