diff options
Diffstat (limited to 'src/bpfswitch/configure')
| -rwxr-xr-x | src/bpfswitch/configure | 276 |
1 files changed, 276 insertions, 0 deletions
diff --git a/src/bpfswitch/configure b/src/bpfswitch/configure new file mode 100755 index 00000000..7dc7f359 --- /dev/null +++ b/src/bpfswitch/configure @@ -0,0 +1,276 @@ +#!/bin/sh +# SPDX-License-Identifier: GPL-2.0 +# This is not an autoconf generated configure +# +# Influential environment variables: +# LIBBPF_DIR Location of libbpf install to use +# KVER Specify a specific kernel version to build programs +# KSRC Location of kernel headers (e.g., source tree) +# KBLD Location of kernel build files (e.g., O= directory) + +# Output file which is input to Makefile +CONFIG_FINAL=config.mk +CONFIG=".${CONFIG}.tmp" + +# Make a temp directory in build tree. +TMPDIR=$(mktemp -d config.XXXXXX) +trap 'status=$?; rm -rf $TMPDIR; rm -f $CONFIG; exit $status' EXIT HUP INT QUIT TERM + +check_toolchain() +{ + : ${PKG_CONFIG:=pkg-config} + : ${CC=gcc} + : ${CLANG=clang} + : ${LLC=llc} + + for TOOL in $PKG_CONFIG $CC $CLANG $LLC; do + if [ ! $(command -v ${TOOL} 2>/dev/null) ]; then + echo "*** ERROR: Cannot find tool ${TOOL}" ; + exit 1; + fi; + done + + echo "PKG_CONFIG:=${PKG_CONFIG}" >>$CONFIG + echo "CC:=${CC}" >>$CONFIG + echo "CLANG:=${CLANG}" >>$CONFIG + echo "LLC:=${LLC}" >>$CONFIG +} + +check_elf() +{ + if ${PKG_CONFIG} libelf --exists; then + echo "HAVE_ELF:=y" >>$CONFIG + echo "yes" + + echo 'CFLAGS += -DHAVE_ELF' `${PKG_CONFIG} libelf --cflags` >> $CONFIG + LDLIBS="$LDLIBS $(${PKG_CONFIG} libelf --libs)" + else + echo "missing - this is required" + return 1 + fi +} + +check_zlib() +{ + if ${PKG_CONFIG} zlib --exists; then + echo "HAVE_ZLIB:=y" >>$CONFIG + echo "yes" + + echo 'CFLAGS += -DHAVE_ZLIB' `${PKG_CONFIG} zlib --cflags` >> $CONFIG + LDLIBS="$LDLIBS $(${PKG_CONFIG} zlib --libs)" + else + echo "missing - this is required" + return 1 + fi +} + +libbpf_compile_test() +{ + local libs="$*" + + cat >$TMPDIR/libbpftest.c <<EOF +#include <bpf/libbpf.h> +int main(int argc, char **argv) { + void *ptr; + DECLARE_LIBBPF_OPTS(bpf_object_open_opts, opts, .pin_root_path = "/path"); + DECLARE_LIBBPF_OPTS(bpf_xdp_set_link_opts, lopts, .old_fd = -1); + (void) bpf_object__open_file("file", &opts); + (void) bpf_program__name(ptr); + (void) bpf_map__set_initial_value(ptr, ptr, 0); + (void) bpf_set_link_xdp_fd_opts(0, 0, 0, &lopts); + return 0; +} +EOF + + libbpf_err=$($CC -o $TMPDIR/libbpftest $TMPDIR/libbpftest.c $LIBBPF_CFLAGS $LIBBPF_LDLIBS $libs 2>&1) +} + +check_custom_libbpf() +{ + LIBBPF_CFLAGS="-I${LIBBPF_DIR}/usr/include" + LIBBPF_LDLIBS="$(find ${LIBBPF_DIR} -name libbpf.a)" + + echo -n "ELF support: " + check_elf || exit 1 + + echo -n "zlib support: " + check_zlib || exit 1 + + libbpf_compile_test "${LDLIBS}" + if [ "$?" -eq "0" ]; then + echo "LIBBPF_DIR=${LIBBPF_DIR}" >> $CONFIG + echo "CFLAGS += $LIBBPF_CFLAGS" >> $CONFIG + echo "LDLIBS += $LIBBPF_LDLIBS $LDLIBS" >> $CONFIG + + echo "libbpf support: custom install" + return 0 + fi + + echo "libbpf support: invalid custom install" + return 1 +} + +check_libbpf() +{ + local libbpf_err + + if [ -n "$LIBBPF_DIR" ]; then + check_custom_libbpf + return $? + fi + + echo -n "libbpf support: " + if [ "${FORCE_SUBMODULE_LIBBPF:-0}" -ne "1" ] && ${PKG_CONFIG} libbpf --exists; then + LIBBPF_CFLAGS=$(${PKG_CONFIG} libbpf --cflags) + LIBBPF_LDLIBS=$(${PKG_CONFIG} libbpf --libs) + + libbpf_compile_test + if [ "$?" -eq "0" ]; then + echo "SYSTEM_LIBBPF:=y" >>$CONFIG + echo 'CFLAGS += ' $LIBBPF_CFLAGS >> $CONFIG + echo 'LDLIBS += ' $LIBBPF_LDLIBS >>$CONFIG + echo 'OBJECT_LIBBPF = ' >>$CONFIG + echo system + + return 0 + fi + else + libbpf_err="${PKG_CONFIG} couldn't find libbpf" + fi + + if [ "${FORCE_SYSTEM_LIBBPF:-0}" -eq "1" ]; then + echo "FORCE_SYSTEM_LIBBPF is set, but no usable libbpf found on system" + echo "error: $libbpf_err" + rm -f "$CONFIG" + exit 1 + fi + + echo submodule + echo "SYSTEM_LIBBPF:=n" >> $CONFIG + echo 'CFLAGS += -I$(LIB_DIR)/libbpf-install/usr/include' >>$CONFIG + echo 'BPF_CFLAGS += -I$(LIB_DIR)/libbpf-install/usr/include' >>$CONFIG + echo 'LDFLAGS += -L$(LIB_DIR)/libbpf/src' >>$CONFIG + echo 'LDLIBS += -l:libbpf.a' >>$CONFIG + echo 'OBJECT_LIBBPF = $(LIB_DIR)/libbpf/src/libbpf.a' >>$CONFIG + if ! [ -d "lib/libbpf/src" ] && [ -f ".gitmodules" ] && [ -e ".git" ]; then + git submodule init && git submodule update + fi + + echo -n "ELF support: " + check_elf || exit 1 + + echo -n "zlib support: " + check_zlib || exit 1 + + echo "LDLIBS += $LDLIBS" >>$CONFIG + + # For the build submodule library we know it does support this API, so we + # hard code it. Also due to the fact it's hard to build a test app as + # libbpf.a has not been build at configure time. + echo "HAVE_LIBBPF_PERF_BUFFER__CONSUME:=y" >>"$CONFIG" +} + +find_kernel_path() +{ + local ksrc + local kbld + + : ${KVER:=$(uname -r)} + + if [ "${KSRC}" != "" ]; then + ksrc="${KSRC}" + # Fedora, Redhat and custom kernels + elif [ -e /lib/modules/${KVER}/source ]; then + ksrc="/lib/modules/${KVER}/source" + # Ubuntu, Debian + elif [ -e /usr/src/linux-headers-${KVER} ]; then + ksrc="/usr/src/linux-headers-${KVER}" + else + echo "Failed to find kernel source directory" >&2 + return 1 + fi + + if [ "${KBLD}" != "" ]; then + kbld="${KBLD}" + elif [ -e /lib/modules/${KVER}/build ]; then + kbld="/lib/modules/${KVER}/build" + else + echo "Failed to find kernel build directory" >&2 + return 1 + fi + echo "KSRC=${ksrc}" >> "$CONFIG" + echo "KBLD=${kbld}" >> "$CONFIG" +} + +quiet_config() +{ + cat <<EOF +# user can control verbosity similar to kernel builds (e.g., V=1) +ifeq ("\$(origin V)", "command line") + VERBOSE = \$(V) +endif +ifndef VERBOSE + VERBOSE = 0 +endif +ifeq (\$(VERBOSE),1) + Q = +else + Q = @ +endif +ifeq (\$(VERBOSE),0) +MAKEFLAGS += --no-print-directory +endif + + +ifeq (\$(VERBOSE), 0) + QUIET_CC = @echo ' CC '\$@; + QUIET_CLANG = @echo ' CLANG '\$@; + QUIET_LLC = @echo ' LLC '\$@; + QUIET_LINK = @echo ' LINK '\$@; + QUIET_INSTALL = @echo ' INSTALL '\$@; + QUIET_GEN = @echo ' GEN '\$@; +endif +EOF +} + +################################################################################ +# show help + +usage() +{ + cat <<EOF +Usage: $0 OPTS + +OPTS: + -l LIBBPF Path to libbpf install (if not using system version) + + -k KVER Kernel version to build against (default: $(uname -r)) + -s KSRC Location of kernel source + -b KBLD Location of kernel build directory +EOF +} + +################################################################################ +# main + +while getopts :l:k:s:b: o +do + case "$o" in + l) LIBBPF_DIR="$OPTARG";; + k) KVER="$OPTARG";; + s) KSRC="$OPTARG";; + b) KBLD="$OPTARG";; + *) usage; exit 1;; + esac +done + +echo "# Generated config" >$CONFIG +quiet_config >> $CONFIG + +check_toolchain + +check_libbpf || exit 1 + +find_kernel_path || exit 1 + +mv $CONFIG $CONFIG_FINAL |