mirror of https://gitee.com/openkylin/linux.git
tools/bpf: Turn on llvm alu32 attribute by default
LLVM alu32 was introduced in LLVM7: https://reviews.llvm.org/rL325987 https://reviews.llvm.org/rL325989 Experiments showed that in general performance is better with alu32 enabled: https://lwn.net/Articles/775316/ This patch turns on alu32 with no-flavor test_progs which is tested most often. The flavor test at no_alu32/test_progs can be used to test without alu32 enabled. The Makefile check for whether LLVM supports '-mattr=+alu32 -mcpu=v3' is removed as LLVM7 should be available for recent distributions and also latest LLVM is preferred to run BPF selftests. Note that jmp32 is checked by -mcpu=probe and will be enabled if the host kernel supports it. Signed-off-by: Yonghong Song <yhs@fb.com> Signed-off-by: Daniel Borkmann <daniel@iogearbox.net> Acked-by: Andrii Nakryiko <andriin@fb.com> Link: https://lore.kernel.org/bpf/20191022043119.2625263-1-yhs@fb.com
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@ -30,17 +30,7 @@ TEST_GEN_PROGS = test_verifier test_tag test_maps test_lru_map test_lpm_map test
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test_sock test_btf test_sockmap get_cgroup_id_user test_socket_cookie \
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test_cgroup_storage test_select_reuseport test_section_names \
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test_netcnt test_tcpnotify_user test_sock_fields test_sysctl test_hashmap \
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test_cgroup_attach xdping
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# Also test sub-register code-gen if LLVM has eBPF v3 processor support which
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# contains both ALU32 and JMP32 instructions.
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SUBREG_CODEGEN := $(shell echo "int cal(int a) { return a > 0; }" | \
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$(CLANG) -target bpf -O2 -emit-llvm -S -x c - -o - | \
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$(LLC) -mattr=+alu32 -mcpu=v3 2>&1 | \
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grep 'if w')
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ifneq ($(SUBREG_CODEGEN),)
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TEST_GEN_PROGS += test_progs-alu32
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endif
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test_cgroup_attach xdping test_progs-no_alu32
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# Also test bpf-gcc, if present
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ifneq ($(BPF_GCC),)
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@ -179,7 +169,7 @@ endef
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# $eval()) and pass control to DEFINE_TEST_RUNNER_RULES.
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# Parameters:
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# $1 - test runner base binary name (e.g., test_progs)
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# $2 - test runner extra "flavor" (e.g., alu32, gcc-bpf, etc)
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# $2 - test runner extra "flavor" (e.g., no_alu32, gcc-bpf, etc)
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define DEFINE_TEST_RUNNER
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TRUNNER_OUTPUT := $(OUTPUT)$(if $2,/)$2
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@ -201,7 +191,7 @@ endef
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# Using TRUNNER_XXX variables, provided by callers of DEFINE_TEST_RUNNER and
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# set up by DEFINE_TEST_RUNNER itself, create test runner build rules with:
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# $1 - test runner base binary name (e.g., test_progs)
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# $2 - test runner extra "flavor" (e.g., alu32, gcc-bpf, etc)
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# $2 - test runner extra "flavor" (e.g., no_alu32, gcc-bpf, etc)
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define DEFINE_TEST_RUNNER_RULES
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ifeq ($($(TRUNNER_OUTPUT)-dir),)
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@ -272,14 +262,12 @@ TRUNNER_EXTRA_FILES := $(OUTPUT)/urandom_read \
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$(wildcard progs/btf_dump_test_case_*.c)
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TRUNNER_BPF_BUILD_RULE := CLANG_BPF_BUILD_RULE
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TRUNNER_BPF_CFLAGS := -I. -I$(OUTPUT) $(BPF_CFLAGS) $(CLANG_CFLAGS)
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TRUNNER_BPF_LDFLAGS :=
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TRUNNER_BPF_LDFLAGS := -mattr=+alu32
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$(eval $(call DEFINE_TEST_RUNNER,test_progs))
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# Define test_progs-alu32 test runner.
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ifneq ($(SUBREG_CODEGEN),)
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TRUNNER_BPF_LDFLAGS += -mattr=+alu32
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$(eval $(call DEFINE_TEST_RUNNER,test_progs,alu32))
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endif
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# Define test_progs-no_alu32 test runner.
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TRUNNER_BPF_LDFLAGS :=
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$(eval $(call DEFINE_TEST_RUNNER,test_progs,no_alu32))
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# Define test_progs BPF-GCC-flavored test runner.
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ifneq ($(BPF_GCC),)
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@ -319,4 +307,4 @@ $(OUTPUT)/test_verifier: test_verifier.c verifier/tests.h $(BPFOBJ) | $(OUTPUT)
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EXTRA_CLEAN := $(TEST_CUSTOM_PROGS) \
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prog_tests/tests.h map_tests/tests.h verifier/tests.h \
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feature $(OUTPUT)/*.o $(OUTPUT)/alu32 $(OUTPUT)/bpf_gcc
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feature $(OUTPUT)/*.o $(OUTPUT)/no_alu32 $(OUTPUT)/bpf_gcc
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