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common.mk
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common.mk
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# Common Makefile parts for BPF-building with libbpf
# --------------------------------------------------
# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
#
# This file should be included from your Makefile like:
# COMMON_DIR = ../common/
# include $(COMMON_DIR)/common.mk
#
# It is expected that you define the variables:
# XDP_TARGETS and USER_TARGETS
# as a space-separated list
#
LLC ?= llc
CLANG ?= clang
CC ?= gcc
XDP_C = ${XDP_TARGETS:=.c}
XDP_OBJ = ${XDP_C:.c=.o}
USER_C := ${USER_TARGETS:=.c}
USER_OBJ := ${USER_C:.c=.o}
# Expect this is defined by including Makefile, but define if not
COMMON_DIR ?= ../common/
COPY_LOADER ?=
LOADER_DIR ?= $(COMMON_DIR)/../utils
# Extend if including Makefile already added some
COMMON_OBJS += $(COMMON_DIR)/common_params.o $(COMMON_DIR)/common_user_bpf_xdp.o
# Create expansions for dependencies
COMMON_H := ${COMMON_OBJS:.o=.h}
EXTRA_DEPS +=
# BPF-prog kern and userspace shares struct via header file:
KERN_USER_H ?= $(wildcard common_kern_user.h)
CFLAGS ?= -g -I../include/
BPF_CFLAGS ?= -I../include/
LIBS = -l:libbpf.a -lelf $(USER_LIBS)
all: llvm-check $(USER_TARGETS) $(XDP_OBJ) $(COPY_LOADER) $(COPY_STATS)
.PHONY: clean $(CLANG) $(LLC)
clean:
$(MAKE) -C $(COMMON_DIR) clean
rm -f $(USER_TARGETS) $(XDP_OBJ) $(USER_OBJ) $(COPY_LOADER) $(COPY_STATS)
rm -f *.ll
rm -f *~
ifdef COPY_LOADER
$(COPY_LOADER): $(LOADER_DIR)/${COPY_LOADER:=.c} $(COMMON_H)
make -C $(LOADER_DIR) $(COPY_LOADER)
cp $(LOADER_DIR)/$(COPY_LOADER) $(COPY_LOADER)
endif
ifdef COPY_STATS
$(COPY_STATS): $(LOADER_DIR)/${COPY_STATS:=.c} $(COMMON_H)
make -C $(LOADER_DIR) $(COPY_STATS)
cp $(LOADER_DIR)/$(COPY_STATS) $(COPY_STATS)
# Needing xdp_stats imply depending on header files:
EXTRA_DEPS += $(COMMON_DIR)/xdp_stats_kern.h $(COMMON_DIR)/xdp_stats_kern_user.h
endif
# For build dependency on this file, if it gets updated
COMMON_MK = $(COMMON_DIR)/common.mk
llvm-check: $(CLANG) $(LLC)
@for TOOL in $^ ; do \
if [ ! $$(command -v $${TOOL} 2>/dev/null) ]; then \
echo "*** ERROR: Cannot find tool $${TOOL}" ;\
exit 1; \
else true; fi; \
done
# Create dependency: detect if C-file change and touch H-file, to trigger
# target $(COMMON_OBJS)
$(COMMON_H): %.h: %.c
touch $@
# Detect if any of common obj changed and create dependency on .h-files
$(COMMON_OBJS): %.o: %.h
make -C $(COMMON_DIR)
$(USER_TARGETS): %: %.c Makefile $(COMMON_MK) $(COMMON_OBJS) $(KERN_USER_H) $(EXTRA_DEPS)
$(CC) -Wall $(CFLAGS) $(LDFLAGS) -o $@ $(COMMON_OBJS) \
$< $(LIBS)
$(XDP_OBJ): %.o: %.c Makefile $(COMMON_MK) $(KERN_USER_H) $(EXTRA_DEPS)
$(CLANG) -S \
-target bpf \
-D __BPF_TRACING__ \
$(BPF_CFLAGS) \
-Wall \
-Wno-unused-value \
-Wno-pointer-sign \
-Wno-compare-distinct-pointer-types \
-Werror \
-O2 -emit-llvm -c -g -o ${@:.o=.ll} $<
$(LLC) -march=bpf -filetype=obj -o $@ ${@:.o=.ll}

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