[PATCH bpf-next 1/3] selftests: bpf: prepare for break up of verifier tests

[Jakub Kicinski <jakub.kicinski@netronome.com>]

test_verifier.c has grown to be very long (almost 16 kLoC),
and it is very conflict prone since we always add tests at
the end.

Try to break it apart a little bit.  Allow test snippets
to be defined in separate files and include them automatically
into the huge test array.

Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Acked-by: Jiong Wang <jiong.wang@netronome.com>
---
 tools/testing/selftests/bpf/Makefile            | 13 +++++++++++++
 tools/testing/selftests/bpf/test_verifier.c     |  3 +++
 tools/testing/selftests/bpf/verifier/.gitignore |  1 +
 3 files changed, 17 insertions(+)
 create mode 100644 tools/testing/selftests/bpf/verifier/.gitignore

diff --git a/tools/testing/selftests/bpf/Makefile b/tools/testing/selftests/bpf/Makefile
index 70229de510f5..576fb27af6a9 100644
--- a/tools/testing/selftests/bpf/Makefile
+++ b/tools/testing/selftests/bpf/Makefile
@@ -166,4 +166,17 @@ ifeq ($(DWARF2BTF),y)
 	$(BTF_PAHOLE) -J $@
 endif
 
+$(OUTPUT)/test_verifier: $(OUTPUT)/verifier/tests.h
+$(OUTPUT)/test_verifier: CFLAGS += -I$(OUTPUT)
+
+VERIFIER_TEST_FILES := $(wildcard verifier/*.c)
+$(OUTPUT)/verifier/tests.h: $(VERIFIER_TEST_FILES)
+	$(shell ( cd verifier/
+		  echo '/* Generated header, do not edit */'; \
+		  echo '#ifdef FILL_ARRAY'; \
+		  ls *.c 2> /dev/null | \
+			sed -e 's@\(.*\)@#include \"\1\"@'; \
+		  echo '#endif' \
+		 ) > $(OUTPUT)/verifier/tests.h)
+
 EXTRA_CLEAN := $(TEST_CUSTOM_PROGS)
diff --git a/tools/testing/selftests/bpf/test_verifier.c b/tools/testing/selftests/bpf/test_verifier.c
index 2fd90d456892..8b795b307824 100644
--- a/tools/testing/selftests/bpf/test_verifier.c
+++ b/tools/testing/selftests/bpf/test_verifier.c
@@ -212,6 +212,9 @@ static void bpf_fill_rand_ld_dw(struct bpf_test *self)
 	BPF_EMIT_CALL(BPF_FUNC_sk_lookup_tcp)
 
 static struct bpf_test tests[] = {
+#define FILL_ARRAY
+#include <verifier/tests.h>
+#undef FILL_ARRAY
 	{
 		"add+sub+mul",
 		.insns = {
diff --git a/tools/testing/selftests/bpf/verifier/.gitignore b/tools/testing/selftests/bpf/verifier/.gitignore
new file mode 100644
index 000000000000..45984a364647
--- /dev/null
+++ b/tools/testing/selftests/bpf/verifier/.gitignore
@@ -0,0 +1 @@
+tests.h
-- 
2.19.2