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BPF : using ubuntu jammy environment

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zeroway
2023-02-02 17:48:42 +08:00
parent 06c3af89b4
commit 944a1ee6bb
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x86/bpf/README.md
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@ -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
## 使用内核中的samples(commit bpf: add sample usages for persistent maps/progs)
cd /path/to/download/ubuntu/source
ln -s $PWD /usr/src/linux
编译bpf模块
修改配置
chmod +x scripts/*
make clean
make defconfig
./scripts/config -e CONFIG_FTRACE
./scripts/config -e CONFIG_DEBUG_INFO
./scripts/config -e CONFIG_DEBUG_INFO_DWARF5
./scripts/config -e CONFIG_BPF_SYSCALL
./scripts/config -e CONFIG_DEBUG_INFO_BTF
./scripts/config -d CONFIG_DEBUG_INFO_REDUCED
yes "" | make oldconfig
安装头文件到当前编译目录
make headers_install
编译内核
make -j$(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