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  1. 14 7月, 2020 1 次提交
  3. 09 7月, 2020 1 次提交
  5. 08 7月, 2020 1 次提交
  7. 04 7月, 2020 1 次提交
  9. 02 7月, 2020 1 次提交
    • A
      tools/bpftool: Turn off -Wnested-externs warning · 17bbf925
      由 Andrii Nakryiko 提交于 
      Turn off -Wnested-externs to avoid annoying warnings in BUILD_BUG_ON macro when
compiling bpftool:

In file included from /data/users/andriin/linux/tools/include/linux/build_bug.h:5,
                 from /data/users/andriin/linux/tools/include/linux/kernel.h:8,
                 from /data/users/andriin/linux/kernel/bpf/disasm.h:10,
                 from /data/users/andriin/linux/kernel/bpf/disasm.c:8:
/data/users/andriin/linux/kernel/bpf/disasm.c: In function ‘__func_get_name’:
/data/users/andriin/linux/tools/include/linux/compiler.h:37:38: warning: nested extern declaration of ‘__compiletime_assert_0’ [-Wnested-externs]
  _compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__)
                                      ^~~~~~~~~~~~~~~~~~~~~
/data/users/andriin/linux/tools/include/linux/compiler.h:16:15: note: in definition of macro ‘__compiletime_assert’
   extern void prefix ## suffix(void) __compiletime_error(msg); \
               ^~~~~~
/data/users/andriin/linux/tools/include/linux/compiler.h:37:2: note: in expansion of macro ‘_compiletime_assert’
  _compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__)
  ^~~~~~~~~~~~~~~~~~~
/data/users/andriin/linux/tools/include/linux/build_bug.h:39:37: note: in expansion of macro ‘compiletime_assert’
 #define BUILD_BUG_ON_MSG(cond, msg) compiletime_assert(!(cond), msg)
                                     ^~~~~~~~~~~~~~~~~~
/data/users/andriin/linux/tools/include/linux/build_bug.h:50:2: note: in expansion of macro ‘BUILD_BUG_ON_MSG’
  BUILD_BUG_ON_MSG(condition, "BUILD_BUG_ON failed: " #condition)
  ^~~~~~~~~~~~~~~~
/data/users/andriin/linux/kernel/bpf/disasm.c:20:2: note: in expansion of macro ‘BUILD_BUG_ON’
  BUILD_BUG_ON(ARRAY_SIZE(func_id_str) != __BPF_FUNC_MAX_ID);
  ^~~~~~~~~~~~
Signed-off-by: NAndrii Nakryiko <andriin@fb.com>
Signed-off-by: NDaniel Borkmann <daniel@iogearbox.net>
Link: https://lore.kernel.org/bpf/20200701212816.2072340-1-andriin@fb.com
      17bbf925
  11. 01 7月, 2020 1 次提交
  13. 25 6月, 2020 2 次提交
  15. 24 6月, 2020 2 次提交
  17. 23 6月, 2020 5 次提交
  19. 20 6月, 2020 1 次提交
  21. 17 6月, 2020 1 次提交
  23. 16 6月, 2020 1 次提交
  25. 13 6月, 2020 1 次提交
  27. 12 6月, 2020 1 次提交
  29. 11 6月, 2020 1 次提交
  31. 10 6月, 2020 1 次提交
  33. 03 6月, 2020 1 次提交
  35. 02 6月, 2020 5 次提交
  37. 20 5月, 2020 1 次提交
  39. 15 5月, 2020 1 次提交
    • D
      bpf, bpftool: Allow probing for CONFIG_HZ from kernel config · 0ee52c0f
      由 Daniel Borkmann 提交于 
      In Cilium we've recently switched to make use of bpf_jiffies64() for
parts of our tc and XDP datapath since bpf_ktime_get_ns() is more
expensive and high-precision is not needed for our timeouts we have
anyway. Our agent has a probe manager which picks up the json of
bpftool's feature probe and we also use the macro output in our C
programs e.g. to have workarounds when helpers are not available on
older kernels.

Extend the kernel config info dump to also include the kernel's
CONFIG_HZ, and rework the probe_kernel_image_config() for allowing a
macro dump such that CONFIG_HZ can be propagated to BPF C code as a
simple define if available via config. Latter allows to have _compile-
time_ resolution of jiffies <-> sec conversion in our code since all
are propagated as known constants.

Given we cannot generally assume availability of kconfig everywhere,
we also have a kernel hz probe [0] as a fallback. Potentially, bpftool
could have an integrated probe fallback as well, although to derive it,
we might need to place it under 'bpftool feature probe full' or similar
given it would slow down the probing process overall. Yet 'full' doesn't
fit either for us since we don't want to pollute the kernel log with
warning messages from bpf_probe_write_user() and bpf_trace_printk() on
agent startup; I've left it out for the time being.

  [0] https://github.com/cilium/cilium/blob/master/bpf/cilium-probe-kernel-hz.cSigned-off-by: NDaniel Borkmann <daniel@iogearbox.net>
Signed-off-by: NAlexei Starovoitov <ast@kernel.org>
Reviewed-by: NQuentin Monnet <quentin@isovalent.com>
Cc: Martin KaFai Lau <kafai@fb.com>
Link: https://lore.kernel.org/bpf/20200513075849.20868-1-daniel@iogearbox.net
      0ee52c0f
  41. 12 5月, 2020 2 次提交
  43. 10 5月, 2020 2 次提交
    • S
      bpf, runqslower: include proper uapi/bpf.h · b4563fac
      由 Song Liu 提交于 
      runqslower doesn't specify include path for uapi/bpf.h. This causes the
following warning:

In file included from runqslower.c:10:
.../tools/testing/selftests/bpf/tools/include/bpf/bpf.h:234:38:
warning: 'enum bpf_stats_type' declared inside parameter list will not
be visible outside of this definition or declaration
  234 | LIBBPF_API int bpf_enable_stats(enum bpf_stats_type type);

Fix this by adding -I tools/includ/uapi to the Makefile.
Reported-by: NAlexei Starovoitov <ast@kernel.org>
Signed-off-by: NSong Liu <songliubraving@fb.com>
Acked-by: NAndrii Nakryiko <andriin@fb.com>
Signed-off-by: NAlexei Starovoitov <ast@kernel.org>
      b4563fac
    • Y
      tools/bpftool: Add bpf_iter support for bptool · 9406b485
      由 Yonghong Song 提交于 
      Currently, only one command is supported
  bpftool iter pin <bpf_prog.o> <path>

It will pin the trace/iter bpf program in
the object file <bpf_prog.o> to the <path>
where <path> should be on a bpffs mount.

For example,
  $ bpftool iter pin ./bpf_iter_ipv6_route.o \
    /sys/fs/bpf/my_route
User can then do a `cat` to print out the results:
  $ cat /sys/fs/bpf/my_route
    fe800000000000000000000000000000 40 00000000000000000000000000000000 ...
    00000000000000000000000000000000 00 00000000000000000000000000000000 ...
    00000000000000000000000000000001 80 00000000000000000000000000000000 ...
    fe800000000000008c0162fffebdfd57 80 00000000000000000000000000000000 ...
    ff000000000000000000000000000000 08 00000000000000000000000000000000 ...
    00000000000000000000000000000000 00 00000000000000000000000000000000 ...

The implementation for ipv6_route iterator is in one of subsequent
patches.

This patch also added BPF_LINK_TYPE_ITER to link query.

In the future, we may add additional parameters to pin command
by parameterizing the bpf iterator. For example, a map_id or pid
may be added to let bpf program only traverses a single map or task,
similar to kernel seq_file single_open().

We may also add introspection command for targets/iterators by
leveraging the bpf_iter itself.
Signed-off-by: NYonghong Song <yhs@fb.com>
Signed-off-by: NAlexei Starovoitov <ast@kernel.org>
Link: https://lore.kernel.org/bpf/20200509175920.2477247-1-yhs@fb.com
      9406b485
  45. 30 4月, 2020 3 次提交
  47. 29 4月, 2020 3 次提交