linux-yocto/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

hostprogs-y := test_lru_dist hostprogs-y += sock_example hostprogs-y += fds_example hostprogs-y += sockex1 hostprogs-y += sockex2 hostprogs-y += sockex3 hostprogs-y += tracex1 hostprogs-y += tracex2 hostprogs-y += tracex3 hostprogs-y += tracex4 hostprogs-y += tracex5 hostprogs-y += tracex6 hostprogs-y += tracex7 hostprogs-y += test_probe_write_user hostprogs-y += trace_output hostprogs-y += lathist hostprogs-y += offwaketime hostprogs-y += spintest hostprogs-y += map_perf_test hostprogs-y += test_overhead hostprogs-y += test_cgrp2_array_pin hostprogs-y += test_cgrp2_attach hostprogs-y += test_cgrp2_attach2 hostprogs-y += test_cgrp2_sock hostprogs-y += test_cgrp2_sock2 hostprogs-y += xdp1 hostprogs-y += xdp2 hostprogs-y += xdp_router_ipv4 hostprogs-y += test_current_task_under_cgroup hostprogs-y += trace_event hostprogs-y += sampleip hostprogs-y += tc_l2_redirect hostprogs-y += lwt_len_hist hostprogs-y += xdp_tx_iptunnel hostprogs-y += test_map_in_map hostprogs-y += per_socket_stats_example hostprogs-y += load_sock_ops hostprogs-y += xdp_redirect hostprogs-y += xdp_redirect_map hostprogs-y += xdp_redirect_cpu hostprogs-y += xdp_monitor hostprogs-y += xdp_rxq_info hostprogs-y += syscall_tp hostprogs-y += cpustat hostprogs-y += xdp_adjust_tail hostprogs-y += xdpsock hostprogs-y += xdp_fwd hostprogs-y += task_fd_query hostprogs-y += xdp_sample_pkts

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 := bpf_load.o fds_example.o sockex1-objs := bpf_load.o sockex1_user.o sockex2-objs := bpf_load.o 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 load_sock_ops-objs := bpf_load.o load_sock_ops.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_attach2-objs := test_cgrp2_attach2.o $(CGROUP_HELPERS) 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)

Tell kbuild to always build the programs

always := $(hostprogs-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 += cookie_uid_helper_example.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 += 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 += xdpsock_kern.o always += xdp_fwd_kern.o always += task_fd_query_kern.o always += xdp_sample_pkts_kern.o

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

HOSTCFLAGS_bpf_load.o += -I$(objtree)/usr/include -Wno-unused-variable HOSTCFLAGS_trace_helpers.o += -I$(srctree)/tools/lib/bpf/

HOSTCFLAGS_trace_output_user.o += -I$(srctree)/tools/lib/bpf/ HOSTCFLAGS_offwaketime_user.o += -I$(srctree)/tools/lib/bpf/ HOSTCFLAGS_spintest_user.o += -I$(srctree)/tools/lib/bpf/ HOSTCFLAGS_trace_event_user.o += -I$(srctree)/tools/lib/bpf/ HOSTCFLAGS_sampleip_user.o += -I$(srctree)/tools/lib/bpf/ HOSTCFLAGS_task_fd_query_user.o += -I$(srctree)/tools/lib/bpf/ HOSTCFLAGS_xdp_sample_pkts_user.o += -I$(srctree)/tools/lib/bpf/

KBUILD_HOSTLDLIBS += $(LIBBPF) -lelf HOSTLDLIBS_tracex4 += -lrt HOSTLDLIBS_trace_output += -lrt HOSTLDLIBS_map_perf_test += -lrt HOSTLDLIBS_test_overhead += -lrt HOSTLDLIBS_xdpsock += -pthread

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

make 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 HOSTCC = $(CROSS_COMPILE)gcc CLANG_ARCH_ARGS = -target $(ARCH) 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 ($(BTF_LLVM_PROBE),) EXTRA_CFLAGS += -g else ifneq ($(and $(BTF_LLC_PROBE),$(BTF_PAHOLE_PROBE),$(BTF_OBJCOPY_PROBE)),) EXTRA_CFLAGS += -g LLC_FLAGS += -mattr=dwarfris DWARF2BTF = y endif endif

Trick to allow make to be run from this directory

all: $(MAKE) -C ../../ $(CURDIR)/ BPF_SAMPLES_PATH=$(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 $@) RM='rm -rf' LDFLAGS= srctree=$(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

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) $(EXTRA_CFLAGS) -I$(obj)
-I$(srctree)/tools/testing/selftests/bpf/
-D__KERNEL__ -D__BPF_TRACING__ -Wno-unused-value -Wno-pointer-sign
-D__TARGET_ARCH_$(ARCH) -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