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selftests: bpf: makefile support sub-register code-gen test mode 

This patch enables testing some eBPF programs under sub-register
compilation mode.

Only enable this when there is BPF_JMP32 support on both LLVM and kernel.
This is because only after BPF_JMP32 added, code-gen for complex program
under sub-register mode will be clean enough to pass verification.

This patch splits TEST_GEN_FILES into BPF_OBJ_FILES and
BPF_OBJ_FILES_DUAL_COMPILE. The latter are those objects we would like to
compile for both default and sub-register mode. They are also objects used
by "test_progs".

Reviewed-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Signed-off-by: Jiong Wang <jiong.wang@netronome.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
This commit is contained in:
Jiong Wang 2019-01-26 12:26:14 -05:00 коммит произвёл Alexei Starovoitov
Родитель 6ea848b5ce
Коммит 3ef84346c5
1 изменённых файлов: 70 добавлений и 25 удалений
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95
tools/testing/selftests/bpf/Makefile
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@ -10,15 +10,14 @@ ifneq ($(wildcard $(GENHDR)),)
GENFLAGS := -DHAVE_GENHDR
endif
CLANG ?= clang
LLC ?= llc
LLVM_OBJCOPY ?= llvm-objcopy
LLVM_READELF ?= llvm-readelf
BTF_PAHOLE ?= pahole
CFLAGS += -Wall -O2 -I$(APIDIR) -I$(LIBDIR) -I$(BPFDIR) -I$(GENDIR) $(GENFLAGS) -I../../../include
LDLIBS += -lcap -lelf -lrt -lpthread
TEST_CUSTOM_PROGS = $(OUTPUT)/urandom_read
all: $(TEST_CUSTOM_PROGS)
$(TEST_CUSTOM_PROGS): $(OUTPUT)/%: %.c
$(CC) -o $(TEST_CUSTOM_PROGS) -static $< -Wl,--build-id
# Order correspond to 'make run_tests' order
TEST_GEN_PROGS = test_verifier test_tag test_maps test_lru_map test_lpm_map test_progs \
test_align test_verifier_log test_dev_cgroup test_tcpbpf_user \
@ -26,21 +25,42 @@ TEST_GEN_PROGS = test_verifier test_tag test_maps test_lru_map test_lpm_map test
test_socket_cookie test_cgroup_storage test_select_reuseport test_section_names \
test_netcnt test_tcpnotify_user
TEST_GEN_FILES = test_pkt_access.o test_xdp.o test_l4lb.o test_tcp_estats.o test_obj_id.o \
test_pkt_md_access.o test_xdp_redirect.o test_xdp_meta.o sockmap_parse_prog.o \
sockmap_verdict_prog.o dev_cgroup.o sample_ret0.o test_tracepoint.o \
test_l4lb_noinline.o test_xdp_noinline.o test_stacktrace_map.o \
test_tcpnotify_kern.o \
sample_map_ret0.o test_tcpbpf_kern.o test_stacktrace_build_id.o \
sockmap_tcp_msg_prog.o connect4_prog.o connect6_prog.o test_adjust_tail.o \
test_btf_haskv.o test_btf_nokv.o test_sockmap_kern.o test_tunnel_kern.o \
test_get_stack_rawtp.o test_sockmap_kern.o test_sockhash_kern.o \
test_lwt_seg6local.o sendmsg4_prog.o sendmsg6_prog.o test_lirc_mode2_kern.o \
BPF_OBJ_FILES = \
test_xdp_redirect.o test_xdp_meta.o sockmap_parse_prog.o \
sockmap_verdict_prog.o dev_cgroup.o sample_ret0.o \
test_tcpnotify_kern.o sample_map_ret0.o test_tcpbpf_kern.o \
sockmap_tcp_msg_prog.o connect4_prog.o connect6_prog.o \
test_btf_haskv.o test_btf_nokv.o test_sockmap_kern.o \
test_tunnel_kern.o test_sockhash_kern.o test_lwt_seg6local.o \
sendmsg4_prog.o sendmsg6_prog.o test_lirc_mode2_kern.o \
get_cgroup_id_kern.o socket_cookie_prog.o test_select_reuseport_kern.o \
test_skb_cgroup_id_kern.o bpf_flow.o netcnt_prog.o \
test_sk_lookup_kern.o test_xdp_vlan.o test_queue_map.o test_stack_map.o \
test_skb_cgroup_id_kern.o bpf_flow.o netcnt_prog.o test_xdp_vlan.o \
xdp_dummy.o test_map_in_map.o
# Objects are built with default compilation flags and with sub-register
# code-gen enabled.
BPF_OBJ_FILES_DUAL_COMPILE = \
test_pkt_access.o test_pkt_access.o test_xdp.o test_adjust_tail.o \
test_l4lb.o test_l4lb_noinline.o test_xdp_noinline.o test_tcp_estats.o \
test_obj_id.o test_pkt_md_access.o test_tracepoint.o \
test_stacktrace_map.o test_stacktrace_map.o test_stacktrace_build_id.o \
test_stacktrace_build_id.o test_get_stack_rawtp.o \
test_get_stack_rawtp.o test_tracepoint.o test_sk_lookup_kern.o \
test_queue_map.o test_stack_map.o
TEST_GEN_FILES = $(BPF_OBJ_FILES) $(BPF_OBJ_FILES_DUAL_COMPILE)
# Also test sub-register code-gen if LLVM + kernel both has eBPF v3 processor
# support which is the first version to contain both ALU32 and JMP32
# instructions.
SUBREG_CODEGEN := $(shell echo "int cal(int a) { return a > 0; }" | \
$(CLANG) -target bpf -O2 -emit-llvm -S -x c - -o - | \
$(LLC) -mattr=+alu32 -mcpu=probe 2>&1 | \
grep 'if w')
ifneq ($(SUBREG_CODEGEN),)
TEST_GEN_FILES += $(patsubst %.o,alu32/%.o, $(BPF_OBJ_FILES_DUAL_COMPILE))
endif
# Order correspond to 'make run_tests' order
TEST_PROGS := test_kmod.sh \
test_libbpf.sh \
@ -65,6 +85,13 @@ TEST_GEN_PROGS_EXTENDED = test_libbpf_open test_sock_addr test_skb_cgroup_id_use
include ../lib.mk
# NOTE: $(OUTPUT) won't get default value if used before lib.mk
TEST_CUSTOM_PROGS = $(OUTPUT)/urandom_read
all: $(TEST_CUSTOM_PROGS)
$(OUTPUT)/urandom_read: $(OUTPUT)/%: %.c
$(CC) -o $@ -static $< -Wl,--build-id
BPFOBJ := $(OUTPUT)/libbpf.a
$(TEST_GEN_PROGS): $(BPFOBJ)
@ -92,12 +119,6 @@ force:
$(BPFOBJ): force
$(MAKE) -C $(BPFDIR) OUTPUT=$(OUTPUT)/
CLANG ?= clang
LLC ?= llc
LLVM_OBJCOPY ?= llvm-objcopy
LLVM_READELF ?= llvm-readelf
BTF_PAHOLE ?= pahole
PROBE := $(shell $(LLC) -march=bpf -mcpu=probe -filetype=null /dev/null 2>&1)
# Let newer LLVM versions transparently probe the kernel for availability
@ -149,6 +170,30 @@ endif
endif
endif
ifneq ($(SUBREG_CODEGEN),)
ALU32_BUILD_DIR = $(OUTPUT)/alu32
TEST_CUSTOM_PROGS += $(ALU32_BUILD_DIR)/test_progs_32
$(ALU32_BUILD_DIR):
mkdir -p $@
$(ALU32_BUILD_DIR)/urandom_read: $(OUTPUT)/urandom_read
cp $< $@
$(ALU32_BUILD_DIR)/test_progs_32: test_progs.c $(ALU32_BUILD_DIR) \
$(ALU32_BUILD_DIR)/urandom_read
$(CC) $(CFLAGS) -o $(ALU32_BUILD_DIR)/test_progs_32 $< \
trace_helpers.c $(OUTPUT)/libbpf.a $(LDLIBS)
$(ALU32_BUILD_DIR)/%.o: %.c $(ALU32_BUILD_DIR) $(ALU32_BUILD_DIR)/test_progs_32
$(CLANG) $(CLANG_FLAGS) \
-O2 -target bpf -emit-llvm -c $< -o - | \
$(LLC) -march=bpf -mattr=+alu32 -mcpu=$(CPU) $(LLC_FLAGS) \
-filetype=obj -o $@
ifeq ($(DWARF2BTF),y)
$(BTF_PAHOLE) -J $@
endif
endif
# Have one program compiled without "-target bpf" to test whether libbpf loads
# it successfully
$(OUTPUT)/test_xdp.o: test_xdp.c
@ -167,4 +212,4 @@ ifeq ($(DWARF2BTF),y)
$(BTF_PAHOLE) -J $@
endif
EXTRA_CLEAN := $(TEST_CUSTOM_PROGS)
EXTRA_CLEAN := $(TEST_CUSTOM_PROGS) $(ALU32_BUILD_DIR)