diff options
author | Jesper Dangaard Brouer <brouer@redhat.com> | 2016-04-28 14:21:04 +0200 |
---|---|---|
committer | David S. Miller <davem@davemloft.net> | 2016-04-29 14:25:32 -0400 |
commit | 1c97566d515de2ef66873e30288b150f0154f3b3 (patch) | |
tree | fc261307afeec86f598abe3d87832c98fd19f4af /samples/bpf/README.rst | |
parent | 7b01dd5793394ee2ef47c328b28c30f5c01107c9 (diff) | |
download | linux-1c97566d515de2ef66873e30288b150f0154f3b3.tar.gz linux-1c97566d515de2ef66873e30288b150f0154f3b3.tar.bz2 linux-1c97566d515de2ef66873e30288b150f0154f3b3.zip |
samples/bpf: add a README file to get users started
Getting started with using examples in samples/bpf/ is not
straightforward. There are several dependencies, and specific
versions of these dependencies.
Just compiling the example tool is also slightly obscure, e.g. one
need to call make like:
make samples/bpf/
Do notice the "/" slash after the directory name.
Signed-off-by: Jesper Dangaard Brouer <brouer@redhat.com>
Acked-by: Naveen N. Rao <naveen.n.rao@linux.vnet.ibm.com>
Acked-by: Alexei Starovoitov <ast@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'samples/bpf/README.rst')
-rw-r--r-- | samples/bpf/README.rst | 63 |
1 files changed, 63 insertions, 0 deletions
diff --git a/samples/bpf/README.rst b/samples/bpf/README.rst new file mode 100644 index 000000000000..6f133f3f0075 --- /dev/null +++ b/samples/bpf/README.rst @@ -0,0 +1,63 @@ +eBPF sample programs +==================== + +This directory contains a mini eBPF library, test stubs, verifier +test-suite and examples for using eBPF. + +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. + +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' command +via redefining LLC on the make command line:: + + make samples/bpf/ LLC=~/git/llvm/build/bin/llc |