linux.git/tools/bpf/bpftool/Makefile, branch v4.20

bpftool: Allow add linker flags via EXTRA_LDFLAGS variable

2018-10-11T08:24:53+00:00

Adding EXTRA_LDFLAGS allowing user to specify extra flags
for LD_FLAGS variable. Also adding LDFLAGS to build command
line.

Signed-off-by: Jiri Olsa 
Acked-by: Song Liu 
Signed-off-by: Daniel Borkmann

bpftool: Allow to add compiler flags via EXTRA_CFLAGS variable

2018-10-11T08:24:52+00:00

Adding EXTRA_CFLAGS allowing user to specify extra flags
for CFLAGS variable.

Signed-off-by: Jiri Olsa 
Acked-by: Song Liu 
Signed-off-by: Daniel Borkmann

tools: bpftool: don't pass FEATURES_DUMP to libbpf

2018-07-16T23:36:57+00:00

bpftool does not export features it probed for, i.e.
FEATURE_DUMP_EXPORT is always empty, so don't try to communicate
the features to libbpf.  It has no effect.

Signed-off-by: Jakub Kicinski 
Reviewed-by: Quentin Monnet 
Acked-by: Daniel Borkmann 
Signed-off-by: Alexei Starovoitov

tools: bpf: make use of reallocarray

2018-07-11T20:13:34+00:00

reallocarray() is a safer variant of realloc which checks for
multiplication overflow in case of array allocation.  Since it's
not available in Glibc < 2.26 import kernel's overflow.h and
add a static inline implementation when needed.  Use feature
detection to probe for existence of reallocarray.

Signed-off-by: Jakub Kicinski 
Reviewed-by: Quentin Monnet 
Reviewed-by: Jiong Wang 
Signed-off-by: Daniel Borkmann

tools: bpftool: use correct make variable type to improve compilation time

2018-06-30T23:01:50+00:00

Commit 4bfe3bd3cc35 ("tools/bpftool: use version from the kernel
source tree") added version to bpftool.  The version used is
equal to the kernel version and obtained by running make kernelversion
against kernel source tree.  Version is then communicated
to the sources with a command line define set in CFLAGS.

Use a simply expanded variable for the version, otherwise the
recursive make will run every time CFLAGS are used.

This brings the single-job compilation time for me from almost
16 sec down to less than 4 sec.

Signed-off-by: Jakub Kicinski 
Reviewed-by: Quentin Monnet 
Signed-off-by: Daniel Borkmann

tools: bpftool: add simple perf event output reader

2018-05-04T21:41:04+00:00

Users of BPF sooner or later discover perf_event_output() helpers
and BPF_MAP_TYPE_PERF_EVENT_ARRAY.  Dumping this array type is
not possible, however, we can add simple reading of perf events.
Create a new event_pipe subcommand for maps, this sub command
will only work with BPF_MAP_TYPE_PERF_EVENT_ARRAY maps.

Parts of the code from samples/bpf/trace_output_user.c.

Signed-off-by: Jakub Kicinski 
Reviewed-by: Quentin Monnet 
Acked-by: Alexei Starovoitov 
Signed-off-by: Daniel Borkmann

tools: bpf: remove feature detection output

2018-03-16T08:23:46+00:00

bpf tools use feature detection for libbfd dependency, clean up
the output files on make clean.

Signed-off-by: Jakub Kicinski 
Signed-off-by: Daniel Borkmann

tools: bpftool: fix dependency file path

2018-03-16T08:22:55+00:00

Auto-generated dependency files are in the OUTPUT directory,
we need to include them from there.  This fixes object files
not being rebuilt after header changes.

Signed-off-by: Jakub Kicinski 
Signed-off-by: Daniel Borkmann

tools: bpftool: silence 'missing initializer' warnings

2018-03-09T09:22:59+00:00

When building bpf tool, gcc emits piles of warnings:

prog.c: In function ‘prog_fd_by_tag’:
prog.c:101:9: warning: missing initializer for field ‘type’ of ‘struct bpf_prog_info’ [-Wmissing-field-initializers]
  struct bpf_prog_info info = {};
         ^
In file included from /home/storage/jbenc/git/net-next/tools/lib/bpf/bpf.h:26:0,
                 from prog.c:47:
/home/storage/jbenc/git/net-next/tools/include/uapi/linux/bpf.h:925:8: note: ‘type’ declared here
  __u32 type;
        ^

As these warnings are not useful, switch them off.

Signed-off-by: Jiri Benc 
Signed-off-by: Daniel Borkmann

tools: bpftool: add -DPACKAGE when including bfd.h

2018-01-17T00:15:05+00:00

bfd.h is requiring including of config.h except when PACKAGE or
PACKAGE_VERSION are defined.

  /* PR 14072: Ensure that config.h is included first.  */
  #if !defined PACKAGE && !defined PACKAGE_VERSION
  #error config.h must be included before this header
  #endif

This check has been introduced since May-2012. It doesn't show up in bfd.h
on some Linux distribution, probably because distributions have remove it
when building the package.

However, sometimes the user might just build libfd from source code then
link bpftool against it. For this case, bfd.h will be original that we need
to define PACKAGE or PACKAGE_VERSION.

Acked-by: Jakub Kicinski 
Signed-off-by: Jiong Wang 
Signed-off-by: Daniel Borkmann