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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
include/bpf.mk: check minimum required clang version Avoid spurious runtime errors caused by loading eBPF modules built with an old clang version Signed-off-by: Felix Fietkau <nbd@nbd.name>
2021-11-09 19:59:15 +00:00
CLANG_MIN_VER:=12
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:=$(PATH)
bpf-headers: add a package with kernel headers for ebpf In order to genererate suitable kernel headers, a 5.10 kernel tree is prepared with a default config for mips. The arch is forced to mips in order to avoid issues with inline asm on various architectures in a way that doesn't involve relying on the host toolchain/headers. It also has the advantage of supporting both endian types Signed-off-by: Felix Fietkau <nbd@nbd.name>
2021-10-26 18:41:22 +00:00
endif
treewide: drop use of which Ubuntu started to flag which as deprecated and it seems which is not really standard and may vary across Distro. Drop the use of which and use the standard 'command -v' for this simple task. Which is still present in the prereq if some package/script still use which. A utility script called command_all.sh is implemented that will just mimic the output of which -a. Signed-off-by: Ansuel Smith <ansuelsmth@gmail.com>
2021-11-25 01:12:58 +00:00
CLANG:=$(firstword $(shell PATH='$(BPF_PATH)' command -v clang clang-13 clang-12 clang-11))
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_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$(LLVM_VER)
BPF_KARCH:=mips
bpf-headers: switch to mips64 for 64 bit targets BTF pointer data has a different size on 32 vs 64 bit targets, and while the generated eBPF code works, the BTF data fails to validate on mismatch Signed-off-by: Felix Fietkau <nbd@nbd.name>
2021-11-18 21:25:47 +00:00
BPF_ARCH:=mips$(if $(CONFIG_ARCH_64BIT),64)$(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 := \
bpf: also include toolchain standard header as system header Also include toolchain standard header as system header. These are required by xdp-tools that try to include stddef.h and stdbool.h for some tools. These header are usually in /lib/gcc/../include but musl also have some special variant in /include. To fix compilation of xdp-tools, also include these standard header. These header should follow ISO C standard and should not introduce regression in bpf tools making them specific to an arch. Link: https://github.com/openwrt/openwrt/pull/15390 Signed-off-by: Christian Marangi <ansuelsmth@gmail.com>
2024-05-05 15:48:31 +00:00
-nostdinc -isystem $(TOOLCHAIN_ROOT_DIR)/lib/gcc/*/*/include \
$(patsubst %,-isystem%,$(TOOLCHAIN_INC_DIRS)) \
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
-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) \
bpf-headers: switch to mips64 for 64 bit targets BTF pointer data has a different size on 32 vs 64 bit targets, and while the generated eBPF code works, the BTF data fails to validate on mismatch Signed-off-by: Felix Fietkau <nbd@nbd.name>
2021-11-18 21:25:47 +00:00
-D__KERNEL__ -D__BPF_TRACING__ -DCONFIG_GENERIC_CSUM \
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
-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
bpf: check llvm version only when used unetd always includes $(INCLUDE_DIR)/bpf.mk. This file always checks if the LLVM version is supported in CLANG_VER_VALID. unetd only needs bpf when UNETD_VXLAN_SUPPORT is set. It fails when UNETD_VXLAN_SUPPORT is not set and llvm is not installed. Fix it by only checking the LLVM version when a LLVM toolchain is available. Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
2022-10-26 21:05:31 +00:00
ifneq ($(CONFIG_HAS_BPF_TOOLCHAIN),)
bpf: ignore missing LLVM bins on package for non compile steps To download a package the LLVM bins are not strictly needed. Currently with an example run of make package/bridger/download V=s, the build fail with make[2]: Entering directory '/home/ansuel/openwrt-ansuel/openwrt/package/network/services/bridger' bash: line 1: /home/ansuel/openwrt-ansuel/openwrt/staging_dir/host/llvm-bpf/bin/clang: No such file or directory bash: line 1: [: : integer expression expected /home/ansuel/openwrt-ansuel/openwrt/include/bpf.mk:71: *** ERROR: LLVM/clang version too old. Minimum required: 12, found: . Stop. make[2]: Leaving directory '/home/ansuel/openwrt-ansuel/openwrt/package/network/services/bridger' time: package/network/services/bridger/download#0.04#0.00#0.06 ERROR: package/network/services/bridger failed to build. This is wrong since it may be needed to download the required packages first and then compile them later. Fix this by ignoring the LLVM bin check on non compile steps. Tested-by: Robert Marko <robimarko@gmail.com> Signed-off-by: Christian Marangi <ansuelsmth@gmail.com>
2023-01-18 11:22:12 +00:00
ifeq ($(DUMP)$(filter download refresh,$(MAKECMDGOALS)),)
include/bpf.mk: fix typo in clang version check Signed-off-by: Felix Fietkau <nbd@nbd.name>
2021-11-12 12:15:35 +00:00
CLANG_VER:=$(shell $(CLANG) -dM -E - < /dev/null | grep __clang_major__ | cut -d' ' -f3)
include/bpf.mk: check minimum required clang version Avoid spurious runtime errors caused by loading eBPF modules built with an old clang version Signed-off-by: Felix Fietkau <nbd@nbd.name>
2021-11-09 19:59:15 +00:00
CLANG_VER_VALID:=$(shell [ "$(CLANG_VER)" -ge "$(CLANG_MIN_VER)" ] && echo 1 )
ifeq ($(CLANG_VER_VALID),)
$(error ERROR: LLVM/clang version too old. Minimum required: $(CLANG_MIN_VER), found: $(CLANG_VER))
endif
endif
bpf: check llvm version only when used unetd always includes $(INCLUDE_DIR)/bpf.mk. This file always checks if the LLVM version is supported in CLANG_VER_VALID. unetd only needs bpf when UNETD_VXLAN_SUPPORT is set. It fails when UNETD_VXLAN_SUPPORT is not set and llvm is not installed. Fix it by only checking the LLVM version when a LLVM toolchain is available. Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
2022-10-26 21:05:31 +00:00
endif
include/bpf.mk: check minimum required clang version Avoid spurious runtime errors caused by loading eBPF modules built with an old clang version Signed-off-by: Felix Fietkau <nbd@nbd.name>
2021-11-09 19:59:15 +00:00
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
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))
bpf: add -mcpu=v3 to support 32-bit alu ops Fixes JIT on 32-bit ARM and improves performance Signed-off-by: Felix Fietkau <nbd@nbd.name>
2021-12-20 23:28:54 +00:00
$(LLVM_LLC) -march=$(BPF_TARGET) -mcpu=v3 -filetype=obj -o $(patsubst %.c,%.o,$(1)) < $(patsubst %.c,%.S,$(1))
include/bpf.mk: preserve the bpf .o file with debug symbols Makes it easier to analyze verifier complaints Signed-off-by: Felix Fietkau <nbd@nbd.name>
2021-11-18 15:47:51 +00:00
$(CP) $(patsubst %.c,%.o,$(1)) $(patsubst %.c,%.debug.o,$(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