mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2025-01-09 14:43:16 +00:00
c2eb6d07a6
Daniel Borkmann says: ==================== pull-request: bpf 2017-12-02 The following pull-request contains BPF updates for your *net* tree. The main changes are: 1) Fix a compilation warning in xdp redirect tracepoint due to missing bpf.h include that pulls in struct bpf_map, from Xie. 2) Limit the maximum number of attachable BPF progs for a given perf event as long as uabi is not frozen yet. The hard upper limit is now 64 and therefore the same as with BPF multi-prog for cgroups. Also add related error checking for the sample BPF loader when enabling and attaching to the perf event, from Yonghong. 3) Specifically set the RLIMIT_MEMLOCK for the test_verifier_log case, so that the test case can always pass and not fail in some environments due to too low default limit, also from Yonghong. 4) Fix up a missing license header comment for kernel/bpf/offload.c, from Jakub. 5) Several fixes for bpftool, among others a crash on incorrect arguments when json output is used, error message handling fixes on unknown options and proper destruction of json writer for some exit cases, all from Quentin. ==================== Signed-off-by: David S. Miller <davem@davemloft.net>
eBPF sample programs ==================== This directory contains a test stubs, verifier test-suite and examples for using eBPF. The examples use libbpf from tools/lib/bpf. Build dependencies ================== Compiling requires having installed: * clang >= version 3.4.0 * llvm >= version 3.7.1 Note that LLVM's tool 'llc' must support target 'bpf', list version and supported targets with command: ``llc --version`` Kernel headers -------------- There are usually dependencies to header files of the current kernel. To avoid installing devel kernel headers system wide, as a normal user, simply call:: make headers_install This will creates a local "usr/include" directory in the git/build top level directory, that the make system automatically pickup first. Compiling ========= For building the BPF samples, issue the below command from the kernel top level directory:: make samples/bpf/ Do notice the "/" slash after the directory name. It is also possible to call make from this directory. This will just hide the the invocation of make as above with the appended "/". Manually compiling LLVM with 'bpf' support ------------------------------------------ Since version 3.7.0, LLVM adds a proper LLVM backend target for the BPF bytecode architecture. By default llvm will build all non-experimental backends including bpf. To generate a smaller llc binary one can use:: -DLLVM_TARGETS_TO_BUILD="BPF" Quick sniplet for manually compiling LLVM and clang (build dependencies are cmake and gcc-c++):: $ git clone http://llvm.org/git/llvm.git $ cd llvm/tools $ git clone --depth 1 http://llvm.org/git/clang.git $ cd ..; mkdir build; cd build $ cmake .. -DLLVM_TARGETS_TO_BUILD="BPF;X86" $ make -j $(getconf _NPROCESSORS_ONLN) It is also possible to point make to the newly compiled 'llc' or 'clang' command via redefining LLC or CLANG on the make command line:: make samples/bpf/ LLC=~/git/llvm/build/bin/llc CLANG=~/git/llvm/build/bin/clang Cross compiling samples ----------------------- In order to cross-compile, say for arm64 targets, export CROSS_COMPILE and ARCH environment variables before calling make. This will direct make to build samples for the cross target. export ARCH=arm64 export CROSS_COMPILE="aarch64-linux-gnu-" make samples/bpf/ LLC=~/git/llvm/build/bin/llc CLANG=~/git/llvm/build/bin/clang