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Date:   Tue, 13 Mar 2018 12:16:34 +0100
From:   Daniel Borkmann <daniel@...earbox.net>
To:     lst <leist.fnst@...fujitsu.com>,
        Alexei Starovoitov <ast@...nel.org>, netdev@...r.kernel.org
Subject: Re: question about bpf.test_progs.fail

Hi Shaoting,

On 03/12/2018 02:52 AM, lst wrote:
> hi, I have a question need your help.
> 
> I get failure "libbpf: incorrect bpf_call opcode" when running below two cases on v4.16-rc3:
> ---------------------
> test_l4lb_all();
>     const char *file2 = "./test_l4lb_noinline.o";
> 
> test_xdp_noinline();
> ---------------------
> 
> and from the file test_libbpf.sh, it seems libbpf can't load noinline functions.
> ---------------------
> # TODO: fix libbpf to load noinline functions
> # [warning] libbpf: incorrect bpf_call opcode
> #libbpf_open_file test_l4lb_noinline.o
> ---------------------
> 
> They all point to bpf_object__open(filename) at last.
> Here(test_progs) test "test_l4lb_noinline.o" but test_libbpf.sh don't.
> 
> So, I guess there must be some setting (like certain kernel kconfig or compiling) to make the test work.
> 
> Can you tell me how can I make this test(test_progs) pass?

Are you using/linking against an old libbpf version that doesn't support
BPF to BPF calls? Latest works fine for me:

# clang --version
clang version 7.0.0 (http://llvm.org/git/clang.git 491b0d6736475fbb9509877edcc18051272b30bd) (http://llvm.org/git/llvm.git 4b957aaea877317bd77344eaa8d8a6645fbaf822)
Target: x86_64-unknown-linux-gnu
Thread model: posix
InstalledDir: /usr/local/bin

# llc --version
LLVM (http://llvm.org/):
  LLVM version 7.0.0svn
  Optimized build.
  Default target: x86_64-unknown-linux-gnu
  Host CPU: skylake

  Registered Targets:
    bpf   - BPF (host endian)
    bpfeb - BPF (big endian)
    bpfel - BPF (little endian)

# uname -a
Linux linux.home 4.16.0-rc4+ #48 SMP Mon Mar 12 15:22:34 CET 2018 x86_64 x86_64 x86_64 GNU/Linux

# cd tools/testing/selftests/bpf
# make clean > /dev/null
# make > /dev/null
Warning: Kernel ABI header at 'tools/include/uapi/linux/bpf.h' differs from latest version at 'include/uapi/linux/bpf.h'
Warning: Kernel ABI header at 'tools/include/uapi/linux/if_link.h' differs from latest version at 'include/uapi/linux/if_link.h'
# ./test_progs
test_pkt_access:PASS:ipv4 148 nsec
test_pkt_access:PASS:ipv6 122 nsec
test_xdp:PASS:ipv4 6898 nsec
test_xdp:PASS:ipv6 15287 nsec
test_l4lb:PASS:ipv4 1126 nsec
test_l4lb:PASS:ipv6 1824 nsec
test_l4lb:PASS:ipv4 1754 nsec
test_l4lb:PASS:ipv6 3254 nsec
test_xdp_noinline:PASS:ipv4 2620 nsec
test_xdp_noinline:PASS:ipv6 3994 nsec
test_tcp_estats:PASS: 0 nsec
test_bpf_obj_id:PASS:get-fd-by-notexist-prog-id 0 nsec
test_bpf_obj_id:PASS:get-fd-by-notexist-map-id 0 nsec
test_bpf_obj_id:PASS:get-map-info(fd) 0 nsec
test_bpf_obj_id:PASS:get-prog-info(fd) 0 nsec
test_bpf_obj_id:PASS:get-map-info(fd) 0 nsec
test_bpf_obj_id:PASS:get-prog-info(fd) 0 nsec
test_bpf_obj_id:PASS:get-prog-fd(next_id) 0 nsec
test_bpf_obj_id:PASS:get-prog-fd(next_id) 0 nsec
test_bpf_obj_id:PASS:get-prog-fd-bad-nr-map-ids 0 nsec
test_bpf_obj_id:PASS:get-prog-info(next_id->fd) 0 nsec
test_bpf_obj_id:PASS:get-prog-fd(next_id) 0 nsec
test_bpf_obj_id:PASS:get-prog-fd-bad-nr-map-ids 0 nsec
test_bpf_obj_id:PASS:get-prog-info(next_id->fd) 0 nsec
test_bpf_obj_id:PASS:check total prog id found by get_next_id 0 nsec
test_bpf_obj_id:PASS:get-map-fd(next_id) 0 nsec
test_bpf_obj_id:PASS:get-map-fd(next_id) 0 nsec
test_bpf_obj_id:PASS:get-map-fd(next_id) 0 nsec
test_bpf_obj_id:PASS:get-map-fd(next_id) 0 nsec
test_bpf_obj_id:PASS:get-map-fd(next_id) 0 nsec
test_bpf_obj_id:PASS:get-map-fd(next_id) 0 nsec
test_bpf_obj_id:PASS:get-map-fd(next_id) 0 nsec
test_bpf_obj_id:PASS:get-map-fd(next_id) 0 nsec
test_bpf_obj_id:PASS:get-map-fd(next_id) 0 nsec
test_bpf_obj_id:PASS:check get-map-info(next_id->fd) 0 nsec
test_bpf_obj_id:PASS:get-map-fd(next_id) 0 nsec
test_bpf_obj_id:PASS:check get-map-info(next_id->fd) 0 nsec
test_bpf_obj_id:PASS:check total map id found by get_next_id 0 nsec
test_pkt_md_access:PASS: 263 nsec
test_obj_name:PASS:check-bpf-prog-name 0 nsec
test_obj_name:PASS:check-bpf-map-name 0 nsec
test_obj_name:PASS:check-bpf-prog-name 0 nsec
test_obj_name:PASS:check-bpf-map-name 0 nsec
test_obj_name:PASS:check-bpf-prog-name 0 nsec
test_obj_name:PASS:check-bpf-map-name 0 nsec
test_obj_name:PASS:check-bpf-prog-name 0 nsec
test_obj_name:PASS:check-bpf-map-name 0 nsec
test_tp_attach_query:PASS:open 0 nsec
test_tp_attach_query:PASS:read 0 nsec
test_tp_attach_query:PASS:prog_load 0 nsec
test_tp_attach_query:PASS:bpf_obj_get_info_by_fd 0 nsec
test_tp_attach_query:PASS:perf_event_open 0 nsec
test_tp_attach_query:PASS:perf_event_ioc_enable 0 nsec
test_tp_attach_query:PASS:perf_event_ioc_query_bpf 0 nsec
test_tp_attach_query:PASS:perf_event_ioc_set_bpf 0 nsec
test_tp_attach_query:PASS:perf_event_ioc_query_bpf 0 nsec
test_tp_attach_query:PASS:perf_event_ioc_query_bpf 0 nsec
test_tp_attach_query:PASS:prog_load 0 nsec
test_tp_attach_query:PASS:bpf_obj_get_info_by_fd 0 nsec
test_tp_attach_query:PASS:perf_event_open 0 nsec
test_tp_attach_query:PASS:perf_event_ioc_enable 0 nsec
test_tp_attach_query:PASS:perf_event_ioc_set_bpf 0 nsec
test_tp_attach_query:PASS:perf_event_ioc_query_bpf 0 nsec
test_tp_attach_query:PASS:perf_event_ioc_query_bpf 0 nsec
test_tp_attach_query:PASS:perf_event_ioc_query_bpf 0 nsec
test_tp_attach_query:PASS:perf_event_ioc_query_bpf 0 nsec
test_tp_attach_query:PASS:perf_event_ioc_query_bpf 0 nsec
test_tp_attach_query:PASS:perf_event_ioc_query_bpf 0 nsec
test_tp_attach_query:PASS:prog_load 0 nsec
test_tp_attach_query:PASS:bpf_obj_get_info_by_fd 0 nsec
test_tp_attach_query:PASS:perf_event_open 0 nsec
test_tp_attach_query:PASS:perf_event_ioc_enable 0 nsec
test_tp_attach_query:PASS:perf_event_ioc_set_bpf 0 nsec
test_tp_attach_query:PASS:perf_event_ioc_query_bpf 0 nsec
test_tp_attach_query:PASS:perf_event_ioc_query_bpf 0 nsec
test_tp_attach_query:PASS:perf_event_ioc_query_bpf 0 nsec
test_tp_attach_query:PASS:perf_event_ioc_query_bpf 0 nsec
test_stacktrace_map:PASS:prog_load 0 nsec
test_stacktrace_map:PASS:open 0 nsec
test_stacktrace_map:PASS:read 0 nsec
test_stacktrace_map:PASS:perf_event_open 0 nsec
test_stacktrace_map:PASS:perf_event_ioc_enable 0 nsec
test_stacktrace_map:PASS:perf_event_ioc_set_bpf 0 nsec
test_stacktrace_map:PASS:bpf_find_map control_map 0 nsec
test_stacktrace_map:PASS:bpf_find_map stackid_hmap 0 nsec
test_stacktrace_map:PASS:bpf_find_map stackmap 0 nsec
test_stacktrace_map:PASS:compare_map_keys stackid_hmap vs. stackmap 0 nsec
test_stacktrace_map:PASS:compare_map_keys stackmap vs. stackid_hmap 0 nsec
Summary: 88 PASSED, 0 FAILED

Thanks,
Daniel

> I shall appreciate a reply at your earliest convenience.
> 
> thanks,
> Shaoting Lei
> 
> 
>

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