linux.git/tools/testing/selftests/bpf/Makefile, branch v5.5

libbpf: Fix build on read-only filesystems

2019-12-23T14:34:06+00:00

I got the following error when I tried to build perf on a read-only
filesystem with O=dir option.

  $ cd /some/where/ro/linux/tools/perf
  $ make O=$HOME/build/perf
  ...
    CC       /home/namhyung/build/perf/lib.o
  /bin/sh: bpf_helper_defs.h: Read-only file system
  make[3]: *** [Makefile:184: bpf_helper_defs.h] Error 1
  make[2]: *** [Makefile.perf:778: /home/namhyung/build/perf/libbpf.a] Error 2
  make[2]: *** Waiting for unfinished jobs....
    LD       /home/namhyung/build/perf/libperf-in.o
    AR       /home/namhyung/build/perf/libperf.a
    PERF_VERSION = 5.4.0
  make[1]: *** [Makefile.perf:225: sub-make] Error 2
  make: *** [Makefile:70: all] Error 2

It was becaused bpf_helper_defs.h was generated in current directory.
Move it to OUTPUT directory.

Signed-off-by: Namhyung Kim 
Signed-off-by: Daniel Borkmann 
Tested-by: Andrii Nakryiko 
Acked-by: Andrii Nakryiko 
Link: https://lore.kernel.org/bpf/20191223061326.843366-1-namhyung@kernel.org

selftests/bpf: Bring back c++ include/link test

2019-12-05T01:57:55+00:00

Commit 5c26f9a78358 ("libbpf: Don't use cxx to test_libpf target")
converted existing c++ test to c. We still want to include and
link against libbpf from c++ code, so reinstate this test back,
this time in a form of a selftest with a clear comment about
its purpose.

v2:
* -lelf -> $(LDLIBS) (Andrii Nakryiko)

Fixes: 5c26f9a78358 ("libbpf: Don't use cxx to test_libpf target")
Signed-off-by: Stanislav Fomichev 
Signed-off-by: Alexei Starovoitov 
Acked-by: Andrii Nakryiko 
Link: https://lore.kernel.org/bpf/20191202215931.248178-1-sdf@google.com

selftests/bpf: Ensure no DWARF relocations for BPF object files

2019-11-25T00:58:45+00:00

Add -mattr=dwarfris attribute to llc to avoid having relocations against DWARF
data. These relocations make it impossible to inspect DWARF contents: all
strings are invalid.

Signed-off-by: Andrii Nakryiko 
Signed-off-by: Alexei Starovoitov 
Link: https://lore.kernel.org/bpf/20191121070743.1309473-2-andriin@fb.com

selftests/bpf: Enforce no-ALU32 for test_progs-no_alu32

2019-11-20T00:53:22+00:00

With the most recent Clang, alu32 is enabled by default if -mcpu=probe or
-mcpu=v3 is specified. Use a separate build rule with -mcpu=v2 to enforce no
ALU32 mode.

Suggested-by: Yonghong Song 
Signed-off-by: Andrii Nakryiko 
Signed-off-by: Alexei Starovoitov 
Acked-by: Yonghong Song 
Link: https://lore.kernel.org/bpf/20191120002510.4130605-1-andriin@fb.com

selftests, bpf: xdping is not meant to be run standalone

2019-11-18T20:31:45+00:00

The actual test to run is test_xdping.sh, which is already in TEST_PROGS.
The xdping program alone is not runnable with 'make run_tests', it
immediatelly fails due to missing arguments.

Move xdping to TEST_GEN_PROGS_EXTENDED in order to be built but not run.

Fixes: cd5385029f1d ("selftests/bpf: measure RTT from xdp using xdping")
Signed-off-by: Jiri Benc 
Signed-off-by: Daniel Borkmann 
Reviewed-by: Alan Maguire 
Acked-by: Toke Høiland-Jørgensen 
Link: https://lore.kernel.org/bpf/4365c81198f62521344c2215909634407184387e.1573821726.git.jbenc@redhat.com

bpf, testing: Add missing object file to TEST_FILES

2019-11-11T21:35:23+00:00

When installing kselftests to its own directory and run the
test_lwt_ip_encap.sh it will complain that test_lwt_ip_encap.o can't be
found. Same with the test_tc_edt.sh test it will complain that
test_tc_edt.o can't be found.

  $ ./test_lwt_ip_encap.sh
  starting egress IPv4 encap test
  Error opening object test_lwt_ip_encap.o: No such file or directory
  Object hashing failed!
  Cannot initialize ELF context!
  Failed to parse eBPF program: Invalid argument

Rework to add test_lwt_ip_encap.o and test_tc_edt.o to TEST_FILES so the
object file gets installed when installing kselftest.

Fixes: 74b5a5968fe8 ("selftests/bpf: Replace test_progs and test_maps w/ general rule")
Signed-off-by: Anders Roxell 
Signed-off-by: Daniel Borkmann 
Acked-by: Song Liu 
Link: https://lore.kernel.org/bpf/20191111161728.8854-1-anders.roxell@linaro.org

selftests/bpf: Restore $(OUTPUT)/test_stub.o rule

2019-10-28T15:16:10+00:00

`make O=/linux-build kselftest TARGETS=bpf` fails with

	make[3]: *** No rule to make target '/linux-build/bpf/test_stub.o', needed by '/linux-build/bpf/test_verifier'

The same command without the O= part works, presumably thanks to the
implicit rule.

Fix by restoring the explicit $(OUTPUT)/test_stub.o rule.

Fixes: 74b5a5968fe8 ("selftests/bpf: Replace test_progs and test_maps w/ general rule")
Signed-off-by: Ilya Leoshkevich 
Signed-off-by: Daniel Borkmann 
Acked-by: Andrii Nakryiko 
Link: https://lore.kernel.org/bpf/20191028102110.7545-1-iii@linux.ibm.com

selftest/bpf: Use -m{little, big}-endian for clang

2019-10-28T15:15:51+00:00

When cross-compiling tests from x86 to s390, the resulting BPF objects
fail to load due to endianness mismatch.

Fix by using BPF-GCC endianness check for clang as well.

Signed-off-by: Ilya Leoshkevich 
Signed-off-by: Daniel Borkmann 
Acked-by: Andrii Nakryiko 
Link: https://lore.kernel.org/bpf/20191028102049.7489-1-iii@linux.ibm.com

selftests/bpf: Fix LDLIBS order

2019-10-23T17:09:48+00:00

Order of $(LDLIBS) matters to linker, so put it after all the .o and .a
files.

Fixes: 74b5a5968fe8 ("selftests/bpf: Replace test_progs and test_maps w/ general rule")
Reported-by: Daniel Borkmann 
Signed-off-by: Andrii Nakryiko 
Signed-off-by: Alexei Starovoitov 
Link: https://lore.kernel.org/bpf/20191023153128.3486140-1-andriin@fb.com

selftests/bpf: Move test_section_names into test_progs and fix it

2019-10-23T17:06:46+00:00

Make test_section_names into test_progs test. Also fix ESRCH expected
results. Add uprobe/uretprobe and tp/raw_tp test cases.

Fixes: dd4436bb8383 ("libbpf: Teach bpf_object__open to guess program types")
Reported-by: kernel test robot 
Signed-off-by: Andrii Nakryiko 
Signed-off-by: Alexei Starovoitov 
Link: https://lore.kernel.org/bpf/20191023060913.1713817-1-andriin@fb.com