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

libbpf: Per-symbol visibility for DSO

2018-10-16T22:16:47+00:00

Make global symbols in libbpf DSO hidden by default with
-fvisibility=hidden and export symbols that are part of ABI explicitly
with __attribute__((visibility("default"))).

This is common practice that should prevent from accidentally exporting
a symbol, that is not supposed to be a part of ABI what, in turn,
improves both libbpf developer- and user-experiences. See [1] for more
details.

Export control becomes more important since more and more projects use
libbpf.

The patch doesn't export a bunch of netlink related functions since as
agreed in [2] they'll be reworked. That doesn't break bpftool since
bpftool links libbpf statically.

[1] https://www.akkadia.org/drepper/dsohowto.pdf (2.2 Export Control)
[2] https://www.mail-archive.com/netdev@vger.kernel.org/msg251434.html

Signed-off-by: Andrey Ignatov 
Signed-off-by: Alexei Starovoitov

tools/bpf: use proper type and uapi perf_event.h header for libbpf

2018-10-10T05:03:28+00:00

Use __u32 instead u32 in libbpf.c and also use
uapi perf_event.h instead of tools/perf/perf-sys.h.

Signed-off-by: Yonghong Song 
Acked-by: Song Liu 
Signed-off-by: Alexei Starovoitov

libbpf: relicense libbpf as LGPL-2.1 OR BSD-2-Clause

2018-10-08T08:09:48+00:00

libbpf is maturing as a library and gaining features that no other bpf libraries support
(BPF Type Format, bpf to bpf calls, etc)
Many Apache2 licensed projects (like bcc, bpftrace, gobpf, cilium, etc)
would like to use libbpf, but cannot do this yet, since Apache Foundation explicitly
states that LGPL is incompatible with Apache2.
Hence let's relicense libbpf as dual license LGPL-2.1 or BSD-2-Clause,
since BSD-2 is compatible with Apache2.
Dual LGPL or Apache2 is invalid combination.
Fix license mistake in Makefile as well.

Signed-off-by: Alexei Starovoitov 
Acked-by: Andrey Ignatov 
Acked-by: Arnaldo Carvalho de Melo 
Acked-by: Björn Töpel 
Acked-by: Daniel Borkmann 
Acked-by: David Beckett 
Acked-by: Jakub Kicinski 
Acked-by: Joe Stringer 
Acked-by: John Fastabend 
Acked-by: Martin KaFai Lau 
Acked-by: Quentin Monnet 
Acked-by: Thomas Graf 
Acked-by: Roman Gushchin 
Acked-by: Wang Nan 
Acked-by: Yonghong Song 
Signed-off-by: Daniel Borkmann

tools: libbpf: remove libelf-getphdrnum feature detection

2018-07-16T23:36:49+00:00

libbpf does not depend on libelf-getphdrnum feature, don't check it.

$ git grep HAVE_ELF_GETPHDRNUM_SUPPORT
tools/perf/Makefile.config:    CFLAGS += -DHAVE_ELF_GETPHDRNUM_SUPPORT
tools/perf/util/symbol-elf.c:#ifndef HAVE_ELF_GETPHDRNUM_SUPPORT

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

libbpf: Install btf.h with libbpf

2018-05-27T22:25:32+00:00

install_headers target should contain all headers that are part of
libbpf. Add missing btf.h

Signed-off-by: Andrey Ignatov 
Acked-by: Martin KaFai Lau 
Acked-by: Song Liu 
Signed-off-by: Daniel Borkmann

tools: bpf: move the event reading loop to libbpf

2018-05-10T23:40:52+00:00

There are two copies of event reading loop - in bpftool and
trace_helpers "library".  Consolidate them and move the code
to libbpf.  Return codes from trace_helpers are kept, but
renamed to include LIBBPF prefix.

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

tools: add netlink.h and if_link.h in tools uapi

2018-02-03T01:53:47+00:00

The headers are necessary for libbpf compilation on system with older
version of the headers.

Signed-off-by: Eric Leblond 
Signed-off-by: Alexei Starovoitov

libbpf: Makefile set specified permission mode

2018-01-17T00:18:10+00:00

The third parameter to do_install was not used by $(INSTALL) command.
Fix this by only setting the -m option when the third parameter is supplied.

The use of a third parameter was introduced in commit  eb54e522a000 ("bpf:
install libbpf headers on 'make install'").

Without this change, the header files are install as executables files (755).

Fixes: eb54e522a000 ("bpf: install libbpf headers on 'make install'")
Signed-off-by: Jesper Dangaard Brouer 
Signed-off-by: Daniel Borkmann

libbpf: cleanup Makefile, remove unused elements

2018-01-17T00:18:10+00:00

The plugin_dir_SQ variable is not used, remove it.
The function update_dir is also unused, remove it.
The variable $VERSION_FILES is empty, remove it.

These all originates from the introduction of the Makefile, and is likely a copy paste
from tools/lib/traceevent/Makefile.

Fixes: 1b76c13e4b36 ("bpf tools: Introduce 'bpf' library and add bpf feature check")
Signed-off-by: Jesper Dangaard Brouer 
Signed-off-by: Daniel Borkmann