samples/bpf: add 'pointer to packet' tests

[cascardo/linux.git] / samples / bpf / Makefile

diff --git a/samples/bpf/Makefile b/samples/bpf/Makefile
index b820cc9..0bf2478 100644 (file)
--- a/samples/bpf/Makefile
+++ b/samples/bpf/Makefile
@@ -19,6 +19,7 @@ hostprogs-y += lathist
 hostprogs-y += offwaketime
 hostprogs-y += spintest
 hostprogs-y += map_perf_test
+hostprogs-y += test_overhead
 
 test_verifier-objs := test_verifier.o libbpf.o
 test_maps-objs := test_maps.o libbpf.o
@@ -38,6 +39,7 @@ lathist-objs := bpf_load.o libbpf.o lathist_user.o
 offwaketime-objs := bpf_load.o libbpf.o offwaketime_user.o
 spintest-objs := bpf_load.o libbpf.o spintest_user.o
 map_perf_test-objs := bpf_load.o libbpf.o map_perf_test_user.o
+test_overhead-objs := bpf_load.o libbpf.o test_overhead_user.o
 
 # Tell kbuild to always build the programs
 always := $(hostprogs-y)
@@ -56,6 +58,9 @@ 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_kprobe_kern.o
+always += parse_varlen.o parse_simple.o parse_ldabs.o
 
 HOSTCFLAGS += -I$(objtree)/usr/include
 
@@ -75,11 +80,46 @@ HOSTLOADLIBES_lathist += -lelf
 HOSTLOADLIBES_offwaketime += -lelf
 HOSTLOADLIBES_spintest += -lelf
 HOSTLOADLIBES_map_perf_test += -lelf -lrt
+HOSTLOADLIBES_test_overhead += -lelf -lrt
+
+# 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
+
+# Trick to allow make to be run from this directory
+all:
+       $(MAKE) -C ../../ $$PWD/
+
+clean:
+       $(MAKE) -C ../../ M=$$PWD clean
+       @rm -f *~
+
+# 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
+
+$(src)/*.c: verify_target_bpf
 
 # 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
-       clang $(NOSTDINC_FLAGS) $(LINUXINCLUDE) $(EXTRA_CFLAGS) \
+       $(CLANG) $(NOSTDINC_FLAGS) $(LINUXINCLUDE) $(EXTRA_CFLAGS) \
                -D__KERNEL__ -D__ASM_SYSREG_H -Wno-unused-value -Wno-pointer-sign \
-               -O2 -emit-llvm -c $< -o -| llc -march=bpf -filetype=obj -o $@
+               -Wno-compare-distinct-pointer-types \
+               -O2 -emit-llvm -c $< -o -| $(LLC) -march=bpf -filetype=obj -o $@