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2020-03-23samples, bpf: Move read_trace_pipe to trace_helpersDaniel T. Lee1-0/+1
To reduce the reliance of trace samples (trace*_user) on bpf_load, move read_trace_pipe to trace_helpers. By moving this bpf_loader helper elsewhere, trace functions can be easily migrated to libbbpf. Signed-off-by: Daniel T. Lee <danieltimlee@gmail.com> Signed-off-by: Daniel Borkmann <daniel@iogearbox.net> Acked-by: Andrii Nakryiko <andriin@fb.com> Link: https://lore.kernel.org/bpf/20200321100424.1593964-2-danieltimlee@gmail.com
2020-01-20selftests: Use consistent include paths for libbpfToke Høiland-Jørgensen1-1/+1
Fix all selftests to include libbpf header files with the bpf/ prefix, to be consistent with external users of the library. Also ensure that all includes of exported libbpf header files (those that are exported on 'make install' of the library) use bracketed includes instead of quoted. To not break the build, keep the old include path until everything has been changed to the new one; a subsequent patch will remove that. Fixes: 6910d7d3867a ("selftests/bpf: Ensure bpf_helper_defs.h are taken from selftests dir") Signed-off-by: Toke Høiland-Jørgensen <toke@redhat.com> Signed-off-by: Alexei Starovoitov <ast@kernel.org> Acked-by: Andrii Nakryiko <andriin@fb.com> Link: https://lore.kernel.org/bpf/157952560568.1683545.9649335788846513446.stgit@toke.dk
2019-07-23selftests/bpf: remove perf buffer helpersAndrii Nakryiko1-9/+0
libbpf's perf_buffer API supersedes trace_helper.h's helpers. Remove those helpers after all existing users were already moved to perf_buffer API. Signed-off-by: Andrii Nakryiko <andriin@fb.com> Acked-by: Song Liu <songliubraving@fb.com> Signed-off-by: Alexei Starovoitov <ast@kernel.org>
2018-06-27trace_helpers.c: Add helpers to poll multiple perf FDs for eventsToke Høiland-Jørgensen1-0/+4
Add two new helper functions to trace_helpers that supports polling multiple perf file descriptors for events. These are used to the XDP perf_event_output example, which needs to work with one perf fd per CPU. Reviewed-by: Jakub Kicinski <jakub.kicinski@netronome.com> Signed-off-by: Toke Høiland-Jørgensen <toke@toke.dk> Acked-by: Song Liu <songliubraving@fb.com> Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
2018-05-24tools/bpf: add ksym_get_addr() in trace_helpersYonghong Song1-0/+1
Given a kernel function name, ksym_get_addr() will return the kernel address for this function, or 0 if it cannot find this function name in /proc/kallsyms. This function will be used later when a kernel address is used to initiate a kprobe perf event. Acked-by: Martin KaFai Lau <kafai@fb.com> Signed-off-by: Yonghong Song <yhs@fb.com> Signed-off-by: Alexei Starovoitov <ast@kernel.org>
2018-05-11tools: bpf: move the event reading loop to libbpfJakub Kicinski1-7/+4
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 <ast@kernel.org> Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com> Reviewed-by: Quentin Monnet <quentin.monnet@netronome.com> Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
2018-04-29samples/bpf: move common-purpose trace functions to selftestsYonghong Song1-0/+23
There is no functionality change in this patch. The common-purpose trace functions, including perf_event polling and ksym lookup, are moved from trace_output_user.c and bpf_load.c to selftests/bpf/trace_helpers.c so that these function can be reused later in selftests. Acked-by: Alexei Starovoitov <ast@fb.com> Signed-off-by: Yonghong Song <yhs@fb.com> Signed-off-by: Alexei Starovoitov <ast@kernel.org>