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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>
This commit is contained in:
Felix Fietkau
parent
5ad663b765
commit
a537d06c72
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ifneq ($(CONFIG_BPF_TOOLCHAIN_HOST),)
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BPF_TOOLCHAIN_HOST_PATH:=$(call qstrip,$(CONFIG_BPF_TOOLCHAIN_HOST_PATH))
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ifneq ($(BPF_TOOLCHAIN_HOST_PATH),)
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BPF_PATH:=$(BPF_TOOLCHAIN_HOST_PATH)/bin:$(PATH)
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else
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BPF_PATH:=$(BPF_PATH)
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endif
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CLANG:=$(firstword $(shell PATH='$(BPF_PATH)' which clang clang-13 clang-12 clang-11))
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LLVM_VER:=$(subst clang,,$(notdir $(CLANG)))
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else
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CLANG:=$(STAGING_DIR_HOST)/bin/clang
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LLVM_VER:=
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endif
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LLVM_PATH:=$(dir $(CLANG))
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LLVM_LLC:=$(LLVM_PATH)/llc$(LLVM_VER)
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LLVM_DIS:=$(LLVM_PATH)/llvm-dis$(LLVM_VER)
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LLVM_OPT:=$(LLVM_PATH)/opt$(LLVM_VER)
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LLVM_STRIP:=$(LLVM_PATH)/llvm-strip$(LLVM_VER)
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BPF_KARCH:=mips
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BPF_ARCH:=mips$(if $(CONFIG_BIG_ENDIAN),,el)
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BPF_HEADERS_DIR:=$(STAGING_DIR)/bpf-headers
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BPF_KERNEL_INCLUDE := \
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-nostdinc -isystem $(TOOLCHAIN_DIR)/include \
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-I$(BPF_HEADERS_DIR)/arch/$(BPF_KARCH)/include \
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-I$(BPF_HEADERS_DIR)/arch/$(BPF_KARCH)/include/asm/mach-generic \
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-I$(BPF_HEADERS_DIR)/arch/$(BPF_KARCH)/include/generated \
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-I$(BPF_HEADERS_DIR)/include \
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-I$(BPF_HEADERS_DIR)/arch/$(BPF_KARCH)/include/uapi \
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-I$(BPF_HEADERS_DIR)/arch/$(BPF_KARCH)/include/generated/uapi \
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-I$(BPF_HEADERS_DIR)/include/uapi \
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-I$(BPF_HEADERS_DIR)/include/generated/uapi \
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-I$(BPF_HEADERS_DIR)/tools/lib \
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-I$(BPF_HEADERS_DIR)/tools/testing/selftests \
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-I$(BPF_HEADERS_DIR)/samples/bpf \
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-include linux/kconfig.h -include asm_goto_workaround.h
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BPF_CFLAGS := \
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$(BPF_KERNEL_INCLUDE) -I$(PKG_BUILD_DIR) \
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-D__KERNEL__ -D__BPF_TRACING__ \
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-D__TARGET_ARCH_${BPF_KARCH} \
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-m$(if $(CONFIG_BIG_ENDIAN),big,little)-endian \
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-fno-stack-protector -Wall \
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-Wno-unused-value -Wno-pointer-sign \
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-Wno-compare-distinct-pointer-types \
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-Wno-gnu-variable-sized-type-not-at-end \
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-Wno-address-of-packed-member -Wno-tautological-compare \
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-Wno-unknown-warning-option \
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-fno-asynchronous-unwind-tables \
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-Wno-uninitialized -Wno-unused-variable \
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-Wno-unused-label \
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-O2 -emit-llvm -Xclang -disable-llvm-passes
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define CompileBPF
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$(CLANG) -g -target $(BPF_ARCH)-linux-gnu $(BPF_CFLAGS) $(2) \
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-c $(1) -o $(patsubst %.c,%.bc,$(1))
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$(LLVM_OPT) -O2 -mtriple=bpf-pc-linux < $(patsubst %.c,%.bc,$(1)) > $(patsubst %.c,%.opt,$(1))
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$(LLVM_DIS) < $(patsubst %.c,%.opt,$(1)) > $(patsubst %.c,%.S,$(1))
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$(LLVM_LLC) -march=bpf -filetype=obj -o $(patsubst %.c,%.o,$(1)) < $(patsubst %.c,%.S,$(1))
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$(LLVM_STRIP) --strip-debug $(patsubst %.c,%.o,$(1))
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endef
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@ -0,0 +1,99 @@
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#
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# Copyright (C) 2006-2009 OpenWrt.org
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#
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# This is free software, licensed under the GNU General Public License v2.
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# See /LICENSE for more information.
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#
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include $(TOPDIR)/rules.mk
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override QUILT:=
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override HOST_QUILT:=
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include $(INCLUDE_DIR)/kernel.mk
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PKG_NAME:=linux
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PKG_PATCHVER:=5.10
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PKG_VERSION:=$(PKG_PATCHVER)$(strip $(LINUX_VERSION-$(PKG_PATCHVER)))
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PKG_SOURCE:=$(PKG_NAME)-$(PKG_VERSION).tar.xz
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PKG_SOURCE_URL:=$(LINUX_SITE)
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PKG_HASH:=$(LINUX_KERNEL_HASH-$(strip $(PKG_VERSION)))
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PKG_BUILD_DIR:=$(KERNEL_BUILD_DIR)/bpf-headers/$(PKG_NAME)-$(PKG_VERSION)
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GENERIC_BACKPORT_DIR := $(GENERIC_PLATFORM_DIR)/backport$(if $(wildcard $(GENERIC_PLATFORM_DIR)/backport-$(PKG_PATCHVER)),-$(PKG_PATCHVER))
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GENERIC_PATCH_DIR := $(GENERIC_PLATFORM_DIR)/pending$(if $(wildcard $(GENERIC_PLATFORM_DIR)/pending-$(PKG_PATCHVER)),-$(PKG_PATCHVER))
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GENERIC_HACK_DIR := $(GENERIC_PLATFORM_DIR)/hack$(if $(wildcard $(GENERIC_PLATFORM_DIR)/hack-$(PKG_PATCHVER)),-$(PKG_PATCHVER))
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GENERIC_FILES_DIR := $(foreach dir,$(wildcard $(GENERIC_PLATFORM_DIR)/files $(GENERIC_PLATFORM_DIR)/files-$(PKG_PATCHVER)),"$(dir)")
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PATCH_DIR := $(CURDIR)/patches
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FILES_DIR :=
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REAL_LINUX_DIR := $(LINUX_DIR)
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LINUX_DIR := $(PKG_BUILD_DIR)
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include $(INCLUDE_DIR)/bpf.mk
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include $(INCLUDE_DIR)/package.mk
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define Package/bpf-headers
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SECTION:=kernel
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CATEGORY:=Kernel
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TITLE:=eBPF kernel headers
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BUILDONLY:=1
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HIDDEN:=1
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endef
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export HOST_EXTRACFLAGS=-I$(STAGING_DIR_HOST)/include
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KERNEL_MAKE := \
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$(MAKE) -C $(PKG_BUILD_DIR) \
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ARCH=$(BPF_KARCH) \
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CROSS_COMPILE=$(BPF_ARCH)-linux- \
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LLVM=1 CC="$(CLANG)" LD="$(TARGET_CROSS)ld" \
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HOSTCC="$(HOSTCC)" \
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HOSTCXX="$(HOSTCXX)" \
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HOST_LOADLIBES="-L$(STAGING_DIR_HOST)/lib" \
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KBUILD_HOSTLDLIBS="-L$(STAGING_DIR_HOST)/lib" \
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CONFIG_SHELL="$(BASH)" \
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INSTALL_HDR_PATH="$(PKG_BUILD_DIR)/user_headers"
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define Build/Patch
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$(Kernel/Patch/Default)
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endef
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BPF_DOC = $(PKG_BUILD_DIR)/scripts/bpf_helpers_doc.py
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define Build/Configure
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grep -vE 'CONFIG_(CPU_.*ENDIAN|HZ)' $(PKG_BUILD_DIR)/arch/mips/configs/generic_defconfig > $(PKG_BUILD_DIR)/.config
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echo 'CONFIG_CPU_$(if $(CONFIG_BIG_ENDIAN),BIG,LITTLE)_ENDIAN=y' >> $(PKG_BUILD_DIR)/.config
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grep CONFIG_HZ $(REAL_LINUX_DIR)/.config >> $(PKG_BUILD_DIR)/.config
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yes '' | $(KERNEL_MAKE) oldconfig
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grep 'CONFIG_HZ=' $(REAL_LINUX_DIR)/.config | \
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cut -d= -f2 | \
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bc -q $(LINUX_DIR)/kernel/time/timeconst.bc \
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> $(LINUX_DIR)/include/generated/timeconst.h
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$(BPF_DOC) --header \
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--file $(LINUX_DIR)/tools/include/uapi/linux/bpf.h \
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> $(PKG_BUILD_DIR)/tools/lib/bpf/bpf_helper_defs.h
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endef
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define Build/Compile
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$(KERNEL_MAKE) archprepare headers_install
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endef
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define Build/InstallDev
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mkdir -p $(1)/bpf-headers/arch $(1)/bpf-headers/tools
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$(CP) \
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$(PKG_BUILD_DIR)/arch/$(BPF_KARCH) \
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$(1)/bpf-headers/arch/
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$(CP) \
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$(PKG_BUILD_DIR)/tools/lib \
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$(PKG_BUILD_DIR)/tools/testing \
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$(1)/bpf-headers/tools/
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$(CP) \
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$(PKG_BUILD_DIR)/include \
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$(PKG_BUILD_DIR)/samples \
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$(PKG_BUILD_DIR)/scripts \
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$(PKG_BUILD_DIR)/user_headers \
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$(1)/bpf-headers
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endef
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$(eval $(call BuildPackage,bpf-headers))
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@ -0,0 +1,14 @@
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#ifndef __LINUX_BOUNDS_H__
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#define __LINUX_BOUNDS_H__
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/*
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* DO NOT MODIFY.
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*
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* This file was generated by Kbuild
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*/
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#define NR_PAGEFLAGS 23 /* __NR_PAGEFLAGS */
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#define MAX_NR_ZONES 4 /* __MAX_NR_ZONES */
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#define NR_CPUS_BITS 1 /* ilog2(CONFIG_NR_CPUS) */
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#define SPINLOCK_SIZE 64 /* sizeof(spinlock_t) */
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#endif
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