linux-imx/samples/bpf/Makefile

SPDX-License-Identifier: GPL-2.0

BPF_SAMPLES_PATH ?= $(abspath $(srctree)/$(src)) TOOLS_PATH := $(BPF_SAMPLES_PATH)/../../tools

List of programs to build

tprogs-y := test_lru_dist tprogs-y += sock_example tprogs-y += fds_example tprogs-y += sockex1 tprogs-y += sockex2 tprogs-y += sockex3 tprogs-y += tracex1 tprogs-y += tracex2 tprogs-y += tracex3 tprogs-y += tracex4 tprogs-y += tracex5 tprogs-y += tracex6 tprogs-y += tracex7 tprogs-y += test_probe_write_user tprogs-y += trace_output tprogs-y += lathist tprogs-y += offwaketime tprogs-y += spintest tprogs-y += map_perf_test tprogs-y += test_overhead tprogs-y += test_cgrp2_array_pin tprogs-y += test_cgrp2_attach tprogs-y += test_cgrp2_sock tprogs-y += test_cgrp2_sock2 tprogs-y += xdp1 tprogs-y += xdp2 tprogs-y += xdp_router_ipv4 tprogs-y += test_current_task_under_cgroup tprogs-y += trace_event tprogs-y += sampleip tprogs-y += tc_l2_redirect tprogs-y += lwt_len_hist tprogs-y += xdp_tx_iptunnel tprogs-y += test_map_in_map tprogs-y += xdp_redirect_map tprogs-y += xdp_redirect_cpu tprogs-y += xdp_monitor tprogs-y += xdp_rxq_info tprogs-y += syscall_tp tprogs-y += cpustat tprogs-y += xdp_adjust_tail tprogs-y += xdpsock tprogs-y += xdp_fwd tprogs-y += task_fd_query tprogs-y += xdp_sample_pkts tprogs-y += ibumad tprogs-y += hbm

Libbpf dependencies

LIBBPF = $(TOOLS_PATH)/lib/bpf/libbpf.a

CGROUP_HELPERS := ../../tools/testing/selftests/bpf/cgroup_helpers.o TRACE_HELPERS := ../../tools/testing/selftests/bpf/trace_helpers.o

fds_example-objs := fds_example.o sockex1-objs := sockex1_user.o sockex2-objs := sockex2_user.o sockex3-objs := bpf_load.o sockex3_user.o tracex1-objs := bpf_load.o tracex1_user.o tracex2-objs := bpf_load.o tracex2_user.o tracex3-objs := bpf_load.o tracex3_user.o tracex4-objs := bpf_load.o tracex4_user.o tracex5-objs := bpf_load.o tracex5_user.o tracex6-objs := bpf_load.o tracex6_user.o tracex7-objs := bpf_load.o tracex7_user.o test_probe_write_user-objs := bpf_load.o test_probe_write_user_user.o trace_output-objs := bpf_load.o trace_output_user.o $(TRACE_HELPERS) lathist-objs := bpf_load.o lathist_user.o offwaketime-objs := bpf_load.o offwaketime_user.o $(TRACE_HELPERS) spintest-objs := bpf_load.o spintest_user.o $(TRACE_HELPERS) map_perf_test-objs := bpf_load.o map_perf_test_user.o test_overhead-objs := bpf_load.o test_overhead_user.o test_cgrp2_array_pin-objs := test_cgrp2_array_pin.o test_cgrp2_attach-objs := test_cgrp2_attach.o test_cgrp2_sock-objs := test_cgrp2_sock.o test_cgrp2_sock2-objs := bpf_load.o test_cgrp2_sock2.o xdp1-objs := xdp1_user.o

reuse xdp1 source intentionally

xdp2-objs := xdp1_user.o xdp_router_ipv4-objs := xdp_router_ipv4_user.o test_current_task_under_cgroup-objs := bpf_load.o $(CGROUP_HELPERS)
test_current_task_under_cgroup_user.o trace_event-objs := bpf_load.o trace_event_user.o $(TRACE_HELPERS) sampleip-objs := bpf_load.o sampleip_user.o $(TRACE_HELPERS) tc_l2_redirect-objs := bpf_load.o tc_l2_redirect_user.o lwt_len_hist-objs := bpf_load.o lwt_len_hist_user.o xdp_tx_iptunnel-objs := xdp_tx_iptunnel_user.o test_map_in_map-objs := bpf_load.o test_map_in_map_user.o per_socket_stats_example-objs := cookie_uid_helper_example.o xdp_redirect-objs := xdp_redirect_user.o xdp_redirect_map-objs := xdp_redirect_map_user.o xdp_redirect_cpu-objs := bpf_load.o xdp_redirect_cpu_user.o xdp_monitor-objs := bpf_load.o xdp_monitor_user.o xdp_rxq_info-objs := xdp_rxq_info_user.o syscall_tp-objs := bpf_load.o syscall_tp_user.o cpustat-objs := bpf_load.o cpustat_user.o xdp_adjust_tail-objs := xdp_adjust_tail_user.o xdpsock-objs := xdpsock_user.o xdp_fwd-objs := xdp_fwd_user.o task_fd_query-objs := bpf_load.o task_fd_query_user.o $(TRACE_HELPERS) xdp_sample_pkts-objs := xdp_sample_pkts_user.o $(TRACE_HELPERS) ibumad-objs := bpf_load.o ibumad_user.o $(TRACE_HELPERS) hbm-objs := bpf_load.o hbm.o $(CGROUP_HELPERS)

Tell kbuild to always build the programs

always := $(tprogs-y) always += sockex1_kern.o always += sockex2_kern.o always += sockex3_kern.o always += tracex1_kern.o always += tracex2_kern.o always += tracex3_kern.o always += tracex4_kern.o always += tracex5_kern.o always += tracex6_kern.o always += tracex7_kern.o always += sock_flags_kern.o always += test_probe_write_user_kern.o always += trace_output_kern.o always += tcbpf1_kern.o always += tc_l2_redirect_kern.o always += lathist_kern.o always += offwaketime_kern.o always += spintest_kern.o always += map_perf_test_kern.o always += test_overhead_tp_kern.o always += test_overhead_raw_tp_kern.o always += test_overhead_kprobe_kern.o always += parse_varlen.o parse_simple.o parse_ldabs.o always += test_cgrp2_tc_kern.o always += xdp1_kern.o always += xdp2_kern.o always += xdp_router_ipv4_kern.o always += test_current_task_under_cgroup_kern.o always += trace_event_kern.o always += sampleip_kern.o always += lwt_len_hist_kern.o always += xdp_tx_iptunnel_kern.o always += test_map_in_map_kern.o always += tcp_synrto_kern.o always += tcp_rwnd_kern.o always += tcp_bufs_kern.o always += tcp_cong_kern.o always += tcp_iw_kern.o always += tcp_clamp_kern.o always += tcp_basertt_kern.o always += tcp_tos_reflect_kern.o always += tcp_dumpstats_kern.o always += xdp_redirect_kern.o always += xdp_redirect_map_kern.o always += xdp_redirect_cpu_kern.o always += xdp_monitor_kern.o always += xdp_rxq_info_kern.o always += xdp2skb_meta_kern.o always += syscall_tp_kern.o always += cpustat_kern.o always += xdp_adjust_tail_kern.o always += xdp_fwd_kern.o always += task_fd_query_kern.o always += xdp_sample_pkts_kern.o always += ibumad_kern.o always += hbm_out_kern.o always += hbm_edt_kern.o always += xdpsock_kern.o

ifeq ($(ARCH), arm)

Strip all except -D__LINUX_ARM_ARCH__ option needed to handle linux

headers when arm instruction set identification is requested.

ARM_ARCH_SELECTOR := $(filter -D__LINUX_ARM_ARCH__%, $(KBUILD_CFLAGS)) BPF_EXTRA_CFLAGS := $(ARM_ARCH_SELECTOR) TPROGS_CFLAGS += $(ARM_ARCH_SELECTOR) endif

TPROGS_CFLAGS += -Wall -O2 TPROGS_CFLAGS += -Wmissing-prototypes TPROGS_CFLAGS += -Wstrict-prototypes

TPROGS_CFLAGS += -I$(objtree)/usr/include TPROGS_CFLAGS += -I$(srctree)/tools/lib/bpf/ TPROGS_CFLAGS += -I$(srctree)/tools/testing/selftests/bpf/ TPROGS_CFLAGS += -I$(srctree)/tools/lib/ TPROGS_CFLAGS += -I$(srctree)/tools/include TPROGS_CFLAGS += -I$(srctree)/tools/perf TPROGS_CFLAGS += -DHAVE_ATTR_TEST=0

ifdef SYSROOT TPROGS_CFLAGS += --sysroot=$(SYSROOT) TPROGS_LDFLAGS := -L$(SYSROOT)/usr/lib endif

TPROGCFLAGS_bpf_load.o += -Wno-unused-variable

TPROGS_LDLIBS += $(LIBBPF) -lelf TPROGLDLIBS_tracex4 += -lrt TPROGLDLIBS_trace_output += -lrt TPROGLDLIBS_map_perf_test += -lrt TPROGLDLIBS_test_overhead += -lrt TPROGLDLIBS_xdpsock += -pthread

Allows pointing LLC/CLANG to a LLVM backend with bpf support, redefine on cmdline:

make M=samples/bpf/ LLC=~/git/llvm/build/bin/llc CLANG=~/git/llvm/build/bin/clang

LLC ?= llc CLANG ?= clang LLVM_OBJCOPY ?= llvm-objcopy BTF_PAHOLE ?= pahole

Detect that we're cross compiling and use the cross compiler

ifdef CROSS_COMPILE CLANG_ARCH_ARGS = --target=$(notdir $(CROSS_COMPILE:%-=%)) endif

Don't evaluate probes and warnings if we need to run make recursively

ifneq ($(src),) HDR_PROBE := $(shell printf "#include <linux/types.h>\n struct list_head { int a; }; int main() { return 0; }" |
$(CC) $(TPROGS_CFLAGS) $(TPROGS_LDFLAGS) -x c -
-o /dev/null 2>/dev/null && echo okay)

ifeq ($(HDR_PROBE),) $(warning WARNING: Detected possible issues with include path.) $(warning WARNING: Please install kernel headers locally (make headers_install).) endif

BTF_LLC_PROBE := $(shell $(LLC) -march=bpf -mattr=help 2>&1 | grep dwarfris) BTF_PAHOLE_PROBE := $(shell $(BTF_PAHOLE) --help 2>&1 | grep BTF) BTF_OBJCOPY_PROBE := $(shell $(LLVM_OBJCOPY) --help 2>&1 | grep -i 'usage.*llvm') BTF_LLVM_PROBE := $(shell echo "int main() { return 0; }" |
$(CLANG) -target bpf -O2 -g -c -x c - -o ./llvm_btf_verify.o;
readelf -S ./llvm_btf_verify.o | grep BTF;
/bin/rm -f ./llvm_btf_verify.o)

ifneq ($(BTF_LLVM_PROBE),) BPF_EXTRA_CFLAGS += -g else ifneq ($(and $(BTF_LLC_PROBE),$(BTF_PAHOLE_PROBE),$(BTF_OBJCOPY_PROBE)),) BPF_EXTRA_CFLAGS += -g LLC_FLAGS += -mattr=dwarfris DWARF2BTF = y endif endif endif

Trick to allow make to be run from this directory

all: $(MAKE) -C ../../ M=$(CURDIR) BPF_SAMPLES_PATH=$(CURDIR)

clean: $(MAKE) -C ../../ M=$(CURDIR) clean @rm -f *~

$(LIBBPF): FORCE

Fix up variables inherited from Kbuild that tools/ build system won't like

$(MAKE) -C $(dir $@) RM='rm -rf' EXTRA_CFLAGS="$(TPROGS_CFLAGS)" \
	LDFLAGS=$(TPROGS_LDFLAGS) srctree=$(BPF_SAMPLES_PATH)/../../ O=

$(obj)/syscall_nrs.h: $(obj)/syscall_nrs.s FORCE $(call filechk,offsets,SYSCALL_NRS_H)

targets += syscall_nrs.s clean-files += syscall_nrs.h

FORCE:

Verify LLVM compiler tools are available and bpf target is supported by llc

.PHONY: verify_cmds verify_target_bpf $(CLANG) $(LLC)

verify_cmds: $(CLANG) $(LLC) @for TOOL in $^ ; do
if ! (which -- "$${TOOL}" > /dev/null 2>&1); then
echo "*** ERROR: Cannot find LLVM tool $${TOOL}" ;
exit 1;
else true; fi;
done

verify_target_bpf: verify_cmds @if ! (${LLC} -march=bpf -mattr=help > /dev/null 2>&1); then
echo "*** ERROR: LLVM (${LLC}) does not support 'bpf' target" ;
echo " NOTICE: LLVM version >= 3.7.1 required" ;
exit 2;
else true; fi

$(BPF_SAMPLES_PATH)/.c: verify_target_bpf $(LIBBPF) $(src)/.c: verify_target_bpf $(LIBBPF)

$(obj)/tracex5_kern.o: $(obj)/syscall_nrs.h $(obj)/hbm_out_kern.o: $(src)/hbm.h $(src)/hbm_kern.h $(obj)/hbm.o: $(src)/hbm.h $(obj)/hbm_edt_kern.o: $(src)/hbm.h $(src)/hbm_kern.h

-include $(BPF_SAMPLES_PATH)/Makefile.target

asm/sysreg.h - inline assembly used by it is incompatible with llvm.

But, there is no easy way to fix it, so just exclude it since it is

useless for BPF samples.

$(obj)/%.o: $(src)/%.c @echo " CLANG-bpf " $@ $(Q)$(CLANG) $(NOSTDINC_FLAGS) $(LINUXINCLUDE) $(BPF_EXTRA_CFLAGS)
-I$(obj) -I$(srctree)/tools/testing/selftests/bpf/
-I$(srctree)/tools/lib/bpf/
-D__KERNEL__ -D__BPF_TRACING__ -Wno-unused-value -Wno-pointer-sign
-D__TARGET_ARCH_$(SRCARCH) -Wno-compare-distinct-pointer-types
-Wno-gnu-variable-sized-type-not-at-end
-Wno-address-of-packed-member -Wno-tautological-compare
-Wno-unknown-warning-option $(CLANG_ARCH_ARGS)
-I$(srctree)/samples/bpf/ -include asm_goto_workaround.h
-O2 -emit-llvm -c $< -o -| $(LLC) -march=bpf $(LLC_FLAGS) -filetype=obj -o $@ ifeq ($(DWARF2BTF),y) $(BTF_PAHOLE) -J $@ endif