* [PATCH v2 bpf-next 1/2] selftests/bpf: enforce libbpf build before BPF programs are built
2019-10-11 22:01 [PATCH v2 bpf-next 0/2] selftests/bpf Makefile cleanup and fixes Andrii Nakryiko
@ 2019-10-11 22:01 ` Andrii Nakryiko
2019-10-11 22:01 ` [PATCH v2 bpf-next 2/2] selftests/bpf: remove obsolete pahole/BTF support detection Andrii Nakryiko
2019-10-12 7:15 ` [Potential Spoof] [PATCH v2 bpf-next 0/2] selftests/bpf Makefile cleanup and fixes Martin Lau
2 siblings, 0 replies; 5+ messages in thread
From: Andrii Nakryiko @ 2019-10-11 22:01 UTC (permalink / raw)
To: bpf, netdev, ast, daniel; +Cc: andrii.nakryiko, kernel-team, Andrii Nakryiko
Given BPF programs rely on libbpf's bpf_helper_defs.h, which is
auto-generated during libbpf build, libbpf build has to happen before
we attempt progs/*.c build. Enforce it as order-only dependency.
Fixes: 24f25763d6de ("libbpf: auto-generate list of BPF helper definitions")
Signed-off-by: Andrii Nakryiko <andriin@fb.com>
---
tools/testing/selftests/bpf/Makefile | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/tools/testing/selftests/bpf/Makefile b/tools/testing/selftests/bpf/Makefile
index 40552fb441e5..f958643d36da 100644
--- a/tools/testing/selftests/bpf/Makefile
+++ b/tools/testing/selftests/bpf/Makefile
@@ -256,7 +256,8 @@ ifeq ($(DWARF2BTF),y)
$(BTF_PAHOLE) -J $@
endif
-$(OUTPUT)/%.o: progs/%.c
+# libbpf has to be built before BPF programs due to bpf_helper_defs.h
+$(OUTPUT)/%.o: progs/%.c | $(BPFOBJ)
($(CLANG) $(BPF_CFLAGS) $(CLANG_CFLAGS) -O2 -target bpf -emit-llvm \
-c $< -o - || echo "clang failed") | \
$(LLC) -march=bpf -mcpu=$(CPU) $(LLC_FLAGS) -filetype=obj -o $@
--
2.17.1
^ permalink raw reply related [flat|nested] 5+ messages in thread
* [PATCH v2 bpf-next 2/2] selftests/bpf: remove obsolete pahole/BTF support detection
2019-10-11 22:01 [PATCH v2 bpf-next 0/2] selftests/bpf Makefile cleanup and fixes Andrii Nakryiko
2019-10-11 22:01 ` [PATCH v2 bpf-next 1/2] selftests/bpf: enforce libbpf build before BPF programs are built Andrii Nakryiko
@ 2019-10-11 22:01 ` Andrii Nakryiko
2019-10-12 7:15 ` [Potential Spoof] [PATCH v2 bpf-next 0/2] selftests/bpf Makefile cleanup and fixes Martin Lau
2 siblings, 0 replies; 5+ messages in thread
From: Andrii Nakryiko @ 2019-10-11 22:01 UTC (permalink / raw)
To: bpf, netdev, ast, daniel; +Cc: andrii.nakryiko, kernel-team, Andrii Nakryiko
Given lots of selftests won't work without recent enough Clang/LLVM that
fully supports BTF, there is no point in maintaining outdated BTF
support detection and fall-back to pahole logic. Just assume we have
everything we need.
Signed-off-by: Andrii Nakryiko <andriin@fb.com>
---
tools/testing/selftests/bpf/Makefile | 54 ++++------------------------
1 file changed, 6 insertions(+), 48 deletions(-)
diff --git a/tools/testing/selftests/bpf/Makefile b/tools/testing/selftests/bpf/Makefile
index f958643d36da..00d05c5e2d57 100644
--- a/tools/testing/selftests/bpf/Makefile
+++ b/tools/testing/selftests/bpf/Makefile
@@ -15,8 +15,6 @@ endif
CLANG ?= clang
LLC ?= llc
LLVM_OBJCOPY ?= llvm-objcopy
-LLVM_READELF ?= llvm-readelf
-BTF_PAHOLE ?= pahole
BPF_GCC ?= $(shell command -v bpf-gcc;)
CFLAGS += -g -Wall -O2 -I$(APIDIR) -I$(LIBDIR) -I$(BPFDIR) -I$(GENDIR) $(GENFLAGS) -I../../../include \
-Dbpf_prog_load=bpf_prog_test_load \
@@ -126,16 +124,6 @@ force:
$(BPFOBJ): force
$(MAKE) -C $(BPFDIR) OUTPUT=$(OUTPUT)/
-PROBE := $(shell $(LLC) -march=bpf -mcpu=probe -filetype=null /dev/null 2>&1)
-
-# Let newer LLVM versions transparently probe the kernel for availability
-# of full BPF instruction set.
-ifeq ($(PROBE),)
- CPU ?= probe
-else
- CPU ?= generic
-endif
-
# Get Clang's default includes on this system, as opposed to those seen by
# '-target bpf'. This fixes "missing" files on some architectures/distros,
# such as asm/byteorder.h, asm/socket.h, asm/sockios.h, sys/cdefs.h etc.
@@ -147,8 +135,9 @@ $(shell $(1) -v -E - </dev/null 2>&1 \
| sed -n '/<...> search starts here:/,/End of search list./{ s| \(/.*\)|-idirafter \1|p }')
endef
CLANG_SYS_INCLUDES = $(call get_sys_includes,$(CLANG))
-BPF_CFLAGS = -I. -I./include/uapi -I../../../include/uapi \
- -I$(BPFDIR) -I$(OUTPUT)/../usr/include -D__TARGET_ARCH_$(SRCARCH)
+BPF_CFLAGS = -g -D__TARGET_ARCH_$(SRCARCH) \
+ -I. -I./include/uapi -I../../../include/uapi \
+ -I$(BPFDIR) -I$(OUTPUT)/../usr/include
CLANG_CFLAGS = $(CLANG_SYS_INCLUDES) \
-Wno-compare-distinct-pointer-types
@@ -162,28 +151,6 @@ $(OUTPUT)/test_stack_map.o: test_queue_stack_map.h
$(OUTPUT)/flow_dissector_load.o: flow_dissector_load.h
$(OUTPUT)/test_progs.o: flow_dissector_load.h
-BTF_LLC_PROBE := $(shell $(LLC) -march=bpf -mattr=help 2>&1 | grep dwarfris)
-BTF_PAHOLE_PROBE := $(shell $(BTF_PAHOLE) --help 2>&1 | grep BTF)
-BTF_OBJCOPY_PROBE := $(shell $(LLVM_OBJCOPY) --help 2>&1 | grep -i 'usage.*llvm')
-BTF_LLVM_PROBE := $(shell echo "int main() { return 0; }" | \
- $(CLANG) -target bpf -O2 -g -c -x c - -o ./llvm_btf_verify.o; \
- $(LLVM_READELF) -S ./llvm_btf_verify.o | grep BTF; \
- /bin/rm -f ./llvm_btf_verify.o)
-
-ifneq ($(BTF_LLVM_PROBE),)
- BPF_CFLAGS += -g
-else
-ifneq ($(BTF_LLC_PROBE),)
-ifneq ($(BTF_PAHOLE_PROBE),)
-ifneq ($(BTF_OBJCOPY_PROBE),)
- BPF_CFLAGS += -g
- LLC_FLAGS += -mattr=dwarfris
- DWARF2BTF = y
-endif
-endif
-endif
-endif
-
TEST_PROGS_CFLAGS := -I. -I$(OUTPUT)
TEST_MAPS_CFLAGS := -I. -I$(OUTPUT)
TEST_VERIFIER_CFLAGS := -I. -I$(OUTPUT) -Iverifier
@@ -212,11 +179,8 @@ $(ALU32_BUILD_DIR)/%.o: progs/%.c $(ALU32_BUILD_DIR)/test_progs_32 \
| $(ALU32_BUILD_DIR)
($(CLANG) $(BPF_CFLAGS) $(CLANG_CFLAGS) -O2 -target bpf -emit-llvm \
-c $< -o - || echo "clang failed") | \
- $(LLC) -march=bpf -mattr=+alu32 -mcpu=$(CPU) $(LLC_FLAGS) \
+ $(LLC) -march=bpf -mcpu=probe -mattr=+alu32 $(LLC_FLAGS) \
-filetype=obj -o $@
-ifeq ($(DWARF2BTF),y)
- $(BTF_PAHOLE) -J $@
-endif
endif
ifneq ($(BPF_GCC),)
@@ -251,19 +215,13 @@ endif
$(OUTPUT)/test_xdp.o: progs/test_xdp.c
($(CLANG) $(BPF_CFLAGS) $(CLANG_CFLAGS) -O2 -emit-llvm -c $< -o - || \
echo "clang failed") | \
- $(LLC) -march=bpf -mcpu=$(CPU) $(LLC_FLAGS) -filetype=obj -o $@
-ifeq ($(DWARF2BTF),y)
- $(BTF_PAHOLE) -J $@
-endif
+ $(LLC) -march=bpf -mcpu=probe $(LLC_FLAGS) -filetype=obj -o $@
# libbpf has to be built before BPF programs due to bpf_helper_defs.h
$(OUTPUT)/%.o: progs/%.c | $(BPFOBJ)
($(CLANG) $(BPF_CFLAGS) $(CLANG_CFLAGS) -O2 -target bpf -emit-llvm \
-c $< -o - || echo "clang failed") | \
- $(LLC) -march=bpf -mcpu=$(CPU) $(LLC_FLAGS) -filetype=obj -o $@
-ifeq ($(DWARF2BTF),y)
- $(BTF_PAHOLE) -J $@
-endif
+ $(LLC) -march=bpf -mcpu=probe $(LLC_FLAGS) -filetype=obj -o $@
PROG_TESTS_DIR = $(OUTPUT)/prog_tests
$(PROG_TESTS_DIR):
--
2.17.1
^ permalink raw reply related [flat|nested] 5+ messages in thread