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backports: add bpf-headers compat layer

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Signed-off-by: John Crispin <john@phrozen.org>
This commit is contained in:
John Crispin
2021-10-28 10:13:51 +02:00
parent 267157563e
commit 6b81555bb2
1 changed files with 215 additions and 0 deletions
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215
backports/0029-bpf-headers-add-a-package-with-kernel-headers-for-eb.patch Normal file
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@@ -0,0 +1,215 @@
From b912dcd063381438ad70f4a3326ff0ac1be7c3ea Mon Sep 17 00:00:00 2001
From: Felix Fietkau <nbd@nbd.name>
Date: Tue, 26 Oct 2021 20:41:22 +0200
Subject: [PATCH] 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>
---
include/bpf.mk | 60 +++++++++++
package/kernel/bpf-headers/Makefile | 99 +++++++++++++++++++
.../src/include/generated/bounds.h | 14 +++
3 files changed, 173 insertions(+)
create mode 100644 include/bpf.mk
create mode 100644 package/kernel/bpf-headers/Makefile
create mode 100644 package/kernel/bpf-headers/src/include/generated/bounds.h
diff --git a/include/bpf.mk b/include/bpf.mk
new file mode 100644
index 0000000000..4e227a11d0
--- /dev/null
+++ b/include/bpf.mk
@@ -0,0 +1,60 @@
+ifeq ($(CONFIG_BUILD_LLVM_BPF),)
+export PATH:=/usr/local/opt/llvm/bin:$(PATH)
+CLANG:=$(firstword $(shell PATH='$(PATH)' which clang clang-13 clang-12 clang-11 clang-10 clang-9))
+LLVM_VER:=$(subst clang,,$(notdir $(CLANG)))
+else
+CLANG:=$(STAGING_DIR_HOST)/bin/clang
+LLVM_VER:=
+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 $(CONFIG_BIG_ENDIAN),,el)
+
+BPF_HEADERS_DIR:=$(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))
+ $(LLVM_OPT) -O2 -mtriple=bpf-pc-linux < $(patsubst %.c,%.bc,$(1)) > $(patsubst %.c,%.opt,$(1))
+ $(LLVM_DIS) < $(patsubst %.c,%.opt,$(1)) > $(patsubst %.c,%.S,$(1))
+ $(LLVM_LLC) -march=bpf -filetype=obj -o $(patsubst %.c,%.o,$(1)) < $(patsubst %.c,%.S,$(1))
+ $(LLVM_STRIP) --strip-debug $(patsubst %.c,%.o,$(1))
+endef
+
diff --git a/package/kernel/bpf-headers/Makefile b/package/kernel/bpf-headers/Makefile
new file mode 100644
index 0000000000..e316feea55
--- /dev/null
+++ b/package/kernel/bpf-headers/Makefile
@@ -0,0 +1,99 @@
+#
+# Copyright (C) 2006-2009 OpenWrt.org
+#
+# This is free software, licensed under the GNU General Public License v2.
+# See /LICENSE for more information.
+#
+include $(TOPDIR)/rules.mk
+
+override QUILT:=
+override HOST_QUILT:=
+
+include $(INCLUDE_DIR)/kernel.mk
+
+
+PKG_NAME:=linux
+PKG_PATCHVER:=5.10
+PKG_VERSION:=$(PKG_PATCHVER)$(strip $(LINUX_VERSION-$(PKG_PATCHVER)))
+PKG_SOURCE:=$(PKG_NAME)-$(PKG_VERSION).tar.xz
+PKG_SOURCE_URL:=$(LINUX_SITE)
+PKG_HASH:=$(LINUX_KERNEL_HASH-$(strip $(PKG_VERSION)))
+PKG_BUILD_DIR:=$(KERNEL_BUILD_DIR)/bpf-headers/$(PKG_NAME)-$(PKG_VERSION)
+
+GENERIC_BACKPORT_DIR := $(GENERIC_PLATFORM_DIR)/backport$(if $(wildcard $(GENERIC_PLATFORM_DIR)/backport-$(PKG_PATCHVER)),-$(PKG_PATCHVER))
+GENERIC_PATCH_DIR := $(GENERIC_PLATFORM_DIR)/pending$(if $(wildcard $(GENERIC_PLATFORM_DIR)/pending-$(PKG_PATCHVER)),-$(PKG_PATCHVER))
+GENERIC_HACK_DIR := $(GENERIC_PLATFORM_DIR)/hack$(if $(wildcard $(GENERIC_PLATFORM_DIR)/hack-$(PKG_PATCHVER)),-$(PKG_PATCHVER))
+GENERIC_FILES_DIR := $(foreach dir,$(wildcard $(GENERIC_PLATFORM_DIR)/files $(GENERIC_PLATFORM_DIR)/files-$(PKG_PATCHVER)),"$(dir)")
+PATCH_DIR := $(CURDIR)/patches
+FILES_DIR :=
+
+REAL_LINUX_DIR := $(LINUX_DIR)
+LINUX_DIR := $(PKG_BUILD_DIR)
+
+include $(INCLUDE_DIR)/bpf.mk
+include $(INCLUDE_DIR)/package.mk
+
+define Package/bpf-headers
+ SECTION:=kernel
+ CATEGORY:=Kernel
+ TITLE:=eBPF kernel headers
+ BUILDONLY:=1
+ HIDDEN:=1
+endef
+
+export HOST_EXTRACFLAGS=-I$(STAGING_DIR_HOST)/include
+
+KERNEL_MAKE := \
+ $(MAKE) -C $(PKG_BUILD_DIR) \
+ ARCH=$(BPF_KARCH) \
+ CROSS_COMPILE=$(BPF_ARCH)-linux- \
+ LLVM=1 CC="$(CLANG)" LD="$(TARGET_CROSS)ld" \
+ HOSTCC="$(HOSTCC)" \
+ HOSTCXX="$(HOSTCXX)" \
+ HOST_LOADLIBES="-L$(STAGING_DIR_HOST)/lib" \
+ KBUILD_HOSTLDLIBS="-L$(STAGING_DIR_HOST)/lib" \
+ CONFIG_SHELL="$(BASH)" \
+ INSTALL_HDR_PATH="$(PKG_BUILD_DIR)/user_headers"
+
+define Build/Patch
+ $(Kernel/Patch/Default)
+endef
+
+BPF_DOC = $(wildcard $(patsubst %,$(LINUX_DIR)/scripts/%.py,bpf_doc bpf_helpers_doc))
+
+define Build/Configure
+ grep -vE 'CONFIG_(CPU_.*ENDIAN|HZ)' $(PKG_BUILD_DIR)/arch/mips/configs/generic_defconfig > $(PKG_BUILD_DIR)/.config
+ echo 'CONFIG_CPU_$(if $(CONFIG_BIG_ENDIAN),BIG,LITTLE)_ENDIAN=y' >> $(PKG_BUILD_DIR)/.config
+ grep CONFIG_HZ $(REAL_LINUX_DIR)/.config >> $(PKG_BUILD_DIR)/.config
+ yes '' | $(KERNEL_MAKE) oldconfig
+ grep 'CONFIG_HZ=' $(REAL_LINUX_DIR)/.config | \
+ cut -d= -f2 | \
+ bc -q $(LINUX_DIR)/kernel/time/timeconst.bc \
+ > $(LINUX_DIR)/include/generated/timeconst.h
+ $(BPF_DOC) --header \
+ --file $(LINUX_DIR)/tools/include/uapi/linux/bpf.h \
+ > $(PKG_BUILD_DIR)/tools/lib/bpf/bpf_helper_defs.h
+endef
+
+define Build/Compile
+ $(KERNEL_MAKE) archprepare headers_install
+endef
+
+define Build/InstallDev
+ mkdir -p $(1)/bpf-headers/arch $(1)/bpf-headers/tools
+ $(CP) \
+ $(PKG_BUILD_DIR)/arch/$(BPF_KARCH) \
+ $(1)/bpf-headers/arch/
+ $(CP) \
+ $(PKG_BUILD_DIR)/tools/lib \
+ $(PKG_BUILD_DIR)/tools/testing \
+ $(1)/bpf-headers/tools/
+ $(CP) \
+ $(PKG_BUILD_DIR)/include \
+ $(PKG_BUILD_DIR)/samples \
+ $(PKG_BUILD_DIR)/scripts \
+ $(PKG_BUILD_DIR)/user_headers \
+ $(1)/bpf-headers
+endef
+
+$(eval $(call BuildPackage,bpf-headers))
diff --git a/package/kernel/bpf-headers/src/include/generated/bounds.h b/package/kernel/bpf-headers/src/include/generated/bounds.h
new file mode 100644
index 0000000000..82ff01043c
--- /dev/null
+++ b/package/kernel/bpf-headers/src/include/generated/bounds.h
@@ -0,0 +1,14 @@
+#ifndef __LINUX_BOUNDS_H__
+#define __LINUX_BOUNDS_H__
+/*
+ * DO NOT MODIFY.
+ *
+ * This file was generated by Kbuild
+ */
+
+#define NR_PAGEFLAGS 23 /* __NR_PAGEFLAGS */
+#define MAX_NR_ZONES 4 /* __MAX_NR_ZONES */
+#define NR_CPUS_BITS 1 /* ilog2(CONFIG_NR_CPUS) */
+#define SPINLOCK_SIZE 64 /* sizeof(spinlock_t) */
+
+#endif
--
2.25.1