BPF : using ubuntu jammy environment

Author: 54shady

x86/bpf/README.md

@@ -7,31 +7,58 @@
 	cd /usr/src/linux
 	make defconfig && make && make headers_install
 
-## 使用demo
+## Using Ubuntu 22.04(jammy) as example
 
-在当前目录操作使用对应文件
+[Ubuntu get source code](https://wiki.ubuntu.com/Kernel/SourceCode)
+[Ubuntu Build Your Own Kernel](https://wiki.ubuntu.com/Kernel/BuildYourOwnKernel)
 
-	ln -s $PWD/demo_kern.c /usr/src/linux/samples/bpf
-	ln -s $PWD/demo_user.c /usr/src/linux/samples/bpf
-	ln -s $PWD/Makefile /usr/src/linux/samples/bpf
+安装必要的软件依赖
 
-在当前目录编译时指定kernel代码路径
+	apt install -y dpkg-dev
+	apt-get build-dep linux linux-image-$(uname -r)
+	apt-get install libncurses-dev gawk flex bison openssl libssl-dev dkms \
+		libelf-dev libudev-dev libpci-dev libiberty-dev autoconf llvm libcap2
 
-    make KERNEL_DIR=/usr/src/linux
+ubuntu解决安装包冲突问题
 
-用file查看下编译输出文件(demo_user.o和demo_kern.o)
+	apt-get install aptitude
+	aptitude install <package-name>
 
-	demo_user.o: ELF 64-bit LSB relocatable, x86-64, version 1 (SYSV), not stripped
-	demo_kern.o: ELF 64-bit LSB relocatable, eBPF, version 1 (SYSV), with debug_info, not stripped
+安装代码(等价于下面的git命令)到/usr/src/linux目录下
 
-- demo_kern.c中的文件是被编译成eBPF的二进制文件,是要被eBPF虚拟机执行的代码
-- demo_user.c是将eBPF二进制文件加载到内核的代码
+	apt-get -y source linux-image-unsigned-$(uname -r)
+		==> git clone git://git.launchpad.net/~ubuntu-kernel/ubuntu/+source/linux/+git/jammy
+
+	cd /path/to/download/ubuntu/source
+	ln -s $PWD /usr/src/linux
+
+修改配置
+
+	chmod +x scripts/*
+	make clean
+	make defconfig
+	./scripts/config -e CONFIG_FTRACE
+	./scripts/config -e CONFIG_DEBUG_INFO
+	./scripts/config -e CONFIG_DEBUG_INFO_DWARF5
+	./scripts/config -e CONFIG_BPF_SYSCALL
+	./scripts/config -e CONFIG_DEBUG_INFO_BTF
+	./scripts/config -d CONFIG_DEBUG_INFO_REDUCED
+	yes "" | make oldconfig
 
-## 使用内核中的samples(commit bpf: add sample usages for persistent maps/progs)
+安装头文件到当前编译目录
 
-编译bpf模块
+	make headers_install
+
+编译内核
+
+	make -j$(nproc) \
+	    KERNEL_DIR=/usr/src/linux \
+	    BPF_TOOLS_PATH=bpf_tools \
+	    BPF_EXAMPLES_PATH=bpf_examples \
+		CC=/usr/bin/gcc
+
+编译内核自带的用例
 
-    cd /usr/src/linux
 	make M=samples/bpf
 
 或者在bpf目录编译
@@ -66,3 +93,24 @@ get elm
 	./fds_example -F /sys/fs/bpf/m -G -m -k 1
 	bpf: get fd:3 (Success)
 	bpf: fd:3 l->(1):24 ret:(0,Success)
+
+## 使用本demo
+
+在当前目录操作使用对应文件
+
+	ln -s $PWD/demo_kern.c /usr/src/linux/samples/bpf
+	ln -s $PWD/demo_user.c /usr/src/linux/samples/bpf
+	mv /usr/src/linux/samples/bpf/Makefile /usr/src/linux/samples/bpf/Makefile-org
+	ln -s $PWD/Makefile /usr/src/linux/samples/bpf
+
+在当前目录编译时指定kernel代码路径
+
+    make KERNEL_DIR=/usr/src/linux
+
+用file查看下编译输出文件(demo_user.o和demo_kern.o)
+
+	demo_user.o: ELF 64-bit LSB relocatable, x86-64, version 1 (SYSV), not stripped
+	demo_kern.o: ELF 64-bit LSB relocatable, eBPF, version 1 (SYSV), with debug_info, not stripped
+
+- demo_kern.c中的文件是被编译成eBPF的二进制文件,是要被eBPF虚拟机执行的代码
+- demo_user.c是将eBPF二进制文件加载到内核的代码