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openwrt/include/bpf.mk

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build: fix bpf toolchain dependency for qosify Add hidden symbols to fix defaults with CONFIG_DEVEL unset Signed-off-by: Felix Fietkau <nbd@nbd.name>
2021-11-01 17:40:03 +00:00
BPF_DEPENDS := @HAS_BPF_TOOLCHAIN
build: add support for using prebuilt LLVM toolchain When the prebuilt llvm toolchain is unpacked into the source dir, it is automatically picked up and used by the build system, and eBPF based packages can be selected Signed-off-by: Felix Fietkau <nbd@nbd.name>
2021-11-04 19:04:44 +00:00
LLVM_VER:=
build: fix bpf toolchain dependency for qosify Add hidden symbols to fix defaults with CONFIG_DEVEL unset Signed-off-by: Felix Fietkau <nbd@nbd.name>
2021-11-01 17:40:03 +00:00
build: add support for using prebuilt LLVM toolchain When the prebuilt llvm toolchain is unpacked into the source dir, it is automatically picked up and used by the build system, and eBPF based packages can be selected Signed-off-by: Felix Fietkau <nbd@nbd.name>
2021-11-04 19:04:44 +00:00
ifneq ($(CONFIG_USE_LLVM_HOST),)
bpf-headers: add a package with kernel headers for ebpf In order to genererate suitable kernel headers, a 5.10 kernel tree is prepared with a default config for mips. The arch is forced to mips in order to avoid issues with inline asm on various architectures in a way that doesn't involve relying on the host toolchain/headers. It also has the advantage of supporting both endian types Signed-off-by: Felix Fietkau <nbd@nbd.name>
2021-10-26 18:41:22 +00:00
BPF_TOOLCHAIN_HOST_PATH:=$(call qstrip,$(CONFIG_BPF_TOOLCHAIN_HOST_PATH))
ifneq ($(BPF_TOOLCHAIN_HOST_PATH),)
BPF_PATH:=$(BPF_TOOLCHAIN_HOST_PATH)/bin:$(PATH)
else
include/bpf.mk: fix typo Signed-off-by: Felix Fietkau <nbd@nbd.name>
2021-11-02 08:56:10 +00:00
BPF_PATH:=$(PATH)
bpf-headers: add a package with kernel headers for ebpf In order to genererate suitable kernel headers, a 5.10 kernel tree is prepared with a default config for mips. The arch is forced to mips in order to avoid issues with inline asm on various architectures in a way that doesn't involve relying on the host toolchain/headers. It also has the advantage of supporting both endian types Signed-off-by: Felix Fietkau <nbd@nbd.name>
2021-10-26 18:41:22 +00:00
endif
CLANG:=$(firstword $(shell PATH='$(BPF_PATH)' which clang clang-13 clang-12 clang-11))
LLVM_VER:=$(subst clang,,$(notdir $(CLANG)))
build: add support for using prebuilt LLVM toolchain When the prebuilt llvm toolchain is unpacked into the source dir, it is automatically picked up and used by the build system, and eBPF based packages can be selected Signed-off-by: Felix Fietkau <nbd@nbd.name>
2021-11-04 19:04:44 +00:00
endif
ifneq ($(CONFIG_USE_LLVM_PREBUILT),)
CLANG:=$(TOPDIR)/llvm-bpf/bin/clang
endif
ifneq ($(CONFIG_USE_LLVM_BUILD),)
llvm-bpf: move to staging_dir/host/llvm-bpf This makes it easier to package it up for the download server Signed-off-by: Felix Fietkau <nbd@nbd.name>
2021-11-02 18:38:12 +00:00
CLANG:=$(STAGING_DIR_HOST)/llvm-bpf/bin/clang
bpf-headers: add a package with kernel headers for ebpf In order to genererate suitable kernel headers, a 5.10 kernel tree is prepared with a default config for mips. The arch is forced to mips in order to avoid issues with inline asm on various architectures in a way that doesn't involve relying on the host toolchain/headers. It also has the advantage of supporting both endian types Signed-off-by: Felix Fietkau <nbd@nbd.name>
2021-10-26 18:41:22 +00:00
endif
LLVM_PATH:=$(dir $(CLANG))
LLVM_LLC:=$(LLVM_PATH)/llc$(LLVM_VER)
LLVM_DIS:=$(LLVM_PATH)/llvm-dis$(LLVM_VER)
LLVM_OPT:=$(LLVM_PATH)/opt$(LLVM_VER)
LLVM_STRIP:=$(LLVM_PATH)/llvm-strip$(LLVM_VER)
BPF_KARCH:=mips
BPF_ARCH:=mips$(if $(CONFIG_BIG_ENDIAN),,el)
include/bpf.mk: fix compile for big-endian targets llvm-opt and llc need endian flags in the target as well Signed-off-by: Felix Fietkau <nbd@nbd.name>
2021-11-02 09:39:35 +00:00
BPF_TARGET:=bpf$(if $(CONFIG_BIG_ENDIAN),eb,el)
bpf-headers: add a package with kernel headers for ebpf In order to genererate suitable kernel headers, a 5.10 kernel tree is prepared with a default config for mips. The arch is forced to mips in order to avoid issues with inline asm on various architectures in a way that doesn't involve relying on the host toolchain/headers. It also has the advantage of supporting both endian types Signed-off-by: Felix Fietkau <nbd@nbd.name>
2021-10-26 18:41:22 +00:00
BPF_HEADERS_DIR:=$(STAGING_DIR)/bpf-headers
BPF_KERNEL_INCLUDE := \
-nostdinc -isystem $(TOOLCHAIN_DIR)/include \
-I$(BPF_HEADERS_DIR)/arch/$(BPF_KARCH)/include \
-I$(BPF_HEADERS_DIR)/arch/$(BPF_KARCH)/include/asm/mach-generic \
-I$(BPF_HEADERS_DIR)/arch/$(BPF_KARCH)/include/generated \
-I$(BPF_HEADERS_DIR)/include \
-I$(BPF_HEADERS_DIR)/arch/$(BPF_KARCH)/include/uapi \
-I$(BPF_HEADERS_DIR)/arch/$(BPF_KARCH)/include/generated/uapi \
-I$(BPF_HEADERS_DIR)/include/uapi \
-I$(BPF_HEADERS_DIR)/include/generated/uapi \
-I$(BPF_HEADERS_DIR)/tools/lib \
-I$(BPF_HEADERS_DIR)/tools/testing/selftests \
-I$(BPF_HEADERS_DIR)/samples/bpf \
-include linux/kconfig.h -include asm_goto_workaround.h
BPF_CFLAGS := \
$(BPF_KERNEL_INCLUDE) -I$(PKG_BUILD_DIR) \
-D__KERNEL__ -D__BPF_TRACING__ \
-D__TARGET_ARCH_${BPF_KARCH} \
-m$(if $(CONFIG_BIG_ENDIAN),big,little)-endian \
-fno-stack-protector -Wall \
-Wno-unused-value -Wno-pointer-sign \
-Wno-compare-distinct-pointer-types \
-Wno-gnu-variable-sized-type-not-at-end \
-Wno-address-of-packed-member -Wno-tautological-compare \
-Wno-unknown-warning-option \
-fno-asynchronous-unwind-tables \
-Wno-uninitialized -Wno-unused-variable \
-Wno-unused-label \
-O2 -emit-llvm -Xclang -disable-llvm-passes
define CompileBPF
$(CLANG) -g -target $(BPF_ARCH)-linux-gnu $(BPF_CFLAGS) $(2) \
-c $(1) -o $(patsubst %.c,%.bc,$(1))
include/bpf.mk: fix compile for big-endian targets llvm-opt and llc need endian flags in the target as well Signed-off-by: Felix Fietkau <nbd@nbd.name>
2021-11-02 09:39:35 +00:00
$(LLVM_OPT) -O2 -mtriple=$(BPF_TARGET) < $(patsubst %.c,%.bc,$(1)) > $(patsubst %.c,%.opt,$(1))
bpf-headers: add a package with kernel headers for ebpf In order to genererate suitable kernel headers, a 5.10 kernel tree is prepared with a default config for mips. The arch is forced to mips in order to avoid issues with inline asm on various architectures in a way that doesn't involve relying on the host toolchain/headers. It also has the advantage of supporting both endian types Signed-off-by: Felix Fietkau <nbd@nbd.name>
2021-10-26 18:41:22 +00:00
$(LLVM_DIS) < $(patsubst %.c,%.opt,$(1)) > $(patsubst %.c,%.S,$(1))
include/bpf.mk: fix compile for big-endian targets llvm-opt and llc need endian flags in the target as well Signed-off-by: Felix Fietkau <nbd@nbd.name>
2021-11-02 09:39:35 +00:00
$(LLVM_LLC) -march=$(BPF_TARGET) -filetype=obj -o $(patsubst %.c,%.o,$(1)) < $(patsubst %.c,%.S,$(1))
bpf-headers: add a package with kernel headers for ebpf In order to genererate suitable kernel headers, a 5.10 kernel tree is prepared with a default config for mips. The arch is forced to mips in order to avoid issues with inline asm on various architectures in a way that doesn't involve relying on the host toolchain/headers. It also has the advantage of supporting both endian types Signed-off-by: Felix Fietkau <nbd@nbd.name>
2021-10-26 18:41:22 +00:00
$(LLVM_STRIP) --strip-debug $(patsubst %.c,%.o,$(1))
endef
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