Add a configuration option to allow specifing the LLVM backend module for compiling BPF C source code into BPF instruction sets.
See INSTALL.BPF.md for usgae information. Signed-off-by: Joe Stringer <joestrin...@nicira.com> Signed-off-by: Andy Zhou <az...@nicira.com> --- INSTALL.BPF.md | 42 ++++++++++++++++++++++++++++++++++++++++++ Makefile.am | 1 + acinclude.m4 | 16 ++++++++++++++++ configure.ac | 2 ++ 4 files changed, 61 insertions(+) create mode 100644 INSTALL.BPF.md diff --git a/INSTALL.BPF.md b/INSTALL.BPF.md new file mode 100644 index 0000000..bc1f5ad --- /dev/null +++ b/INSTALL.BPF.md @@ -0,0 +1,42 @@ +# Dependencies + +- Need Clang + llvm-dev version 3.X for any (2 <= X <= 4) +- http://llvm.org/apt/ + +apt-get install libelf-dev clang-3.4 llvm-3.4-dev + +# Build LLVM plugin + +*[Upstream] git://git.kernel.org/pub/scm/linux/kernel/git/ast/bpf* + +git clone git://github.com/joestringer/linux +NN=$PWD/linux + +cd $NN/tools/bpf/llvm/bld +make LLVM_CONFIG=`which llvm-config-3.4` + +# Configure OVS to use BPF LLC + +OVS=/path/to/openvswitch +cd $OVS +./configure --with-llc=$NN/tools/bpf/llvm/bld/Debug+Asserts/bin/llc + +# Build OVS and BPF module + +make +cd datapath/bpf +make + +# Load BPF module + +cd $NN/ +make M=samples/bpf +samples/bpf/simple_load $OVS/datapath/bpf/simple.bpf + +Note down which fd was used for the program. This will be used in next step. + +# Install flow to use BPF + +$OVS/utilities/ovs-dpctl add-flow "eth(src=00:00:00:00:00:00,dst=00:00:00:00:00:00)" "bpf(<FD>, 0)" + +Success? diff --git a/Makefile.am b/Makefile.am index 1363abe..ee8fe03 100644 --- a/Makefile.am +++ b/Makefile.am @@ -71,6 +71,7 @@ docs = \ DESIGN.md \ FAQ.md \ INSTALL.md \ + INSTALL.BPF.md \ INSTALL.Debian.md \ INSTALL.Docker.md \ INSTALL.DPDK.md \ diff --git a/acinclude.m4 b/acinclude.m4 index f419056..e3b5356 100644 --- a/acinclude.m4 +++ b/acinclude.m4 @@ -157,6 +157,22 @@ AC_DEFUN([OVS_CHECK_LINUX], [ AM_CONDITIONAL(LINUX_ENABLED, test -n "$KBUILD") ]) +dnl OVS_CHECK_BPF +dnl +dnl Check clang set ups for compiling BPF +AC_DEFUN([OVS_CHECK_LLC], [ + AC_ARG_WITH([llc], + [AC_HELP_STRING([--with-llc=/path/to/llc], + [Specify the bpf clang backend binrary])]) + + if (test X"$with_llc" != X); then + LLC=$with_llc + if (test ! -x $LLC); then + AC_MSG_ERROR([BPF llc backend is configured but not found ]) + fi + fi +]) + dnl OVS_CHECK_DPDK dnl dnl Configure DPDK source tree diff --git a/configure.ac b/configure.ac index d2d02ca..7510d56 100644 --- a/configure.ac +++ b/configure.ac @@ -160,8 +160,10 @@ OVS_ENABLE_SPARSE AC_ARG_VAR(KARCH, [Kernel Architecture String]) AC_SUBST(KARCH) +AC_ARG_VAR(LLC, [LLVM bpf backend processor]) OVS_CHECK_LINUX OVS_CHECK_DPDK +OVS_CHECK_LLC OVS_CHECK_PRAGMA_MESSAGE AC_SUBST([OVS_CFLAGS]) AC_SUBST([OVS_LDFLAGS]) -- 1.9.1 _______________________________________________ dev mailing list dev@openvswitch.org http://openvswitch.org/mailman/listinfo/dev
