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2020-10-02selftests/bpf: Ksyms_btf to test typed ksymsHao Luo1-0/+27
Selftests for typed ksyms. Tests two types of ksyms: one is a struct, the other is a plain int. This tests two paths in the kernel. Struct ksyms will be converted into PTR_TO_BTF_ID by the verifier while int typed ksyms will be converted into PTR_TO_MEM. Signed-off-by: Hao Luo <[email protected]> Signed-off-by: Alexei Starovoitov <[email protected]> Acked-by: Andrii Nakryiko <[email protected]> Link: https://lore.kernel.org/bpf/[email protected]
2020-03-23samples, bpf: Move read_trace_pipe to trace_helpersDaniel T. Lee1-0/+23
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 <[email protected]> Signed-off-by: Daniel Borkmann <[email protected]> Acked-by: Andrii Nakryiko <[email protected]> Link: https://lore.kernel.org/bpf/[email protected]
2019-07-23selftests/bpf: remove perf buffer helpersAndrii Nakryiko1-125/+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 <[email protected]> Acked-by: Song Liu <[email protected]> Signed-off-by: Alexei Starovoitov <[email protected]>
2019-05-28bpf: style fix in while(!feof()) loopChang-Hsien Tsai1-3/+1
Use fgets() as the while loop condition. Signed-off-by: Chang-Hsien Tsai <[email protected]> Acked-by: Yonghong Song <[email protected]> Signed-off-by: Daniel Borkmann <[email protected]>
2019-04-04selftests/bpf: ksym_search won't check symbols existsDaniel T. Lee1-0/+4
Currently, ksym_search located at trace_helpers won't check symbols are existing or not. In ksym_search, when symbol is not found, it will return &syms[0](_stext). But when the kernel symbols are not loaded, it will return NULL, which is not a desired action. This commit will add verification logic whether symbols are loaded prior to the symbol search. Signed-off-by: Daniel T. Lee <[email protected]> Signed-off-by: Daniel Borkmann <[email protected]>
2018-10-20bpf, libbpf: simplify and cleanup perf ring buffer walkDaniel Borkmann1-3/+4
Simplify bpf_perf_event_read_simple() a bit and fix up some minor things along the way: the return code in the header is not of type int but enum bpf_perf_event_ret instead. Once callback indicated to break the loop walking event data, it also needs to be consumed in data_tail since it has been processed already. Moreover, bpf_perf_event_print_t callback should avoid void * as we actually get a pointer to struct perf_event_header and thus applications can make use of container_of() to have type checks. The walk also doesn't have to use modulo op since the ring size is required to be power of two. Signed-off-by: Daniel Borkmann <[email protected]> Signed-off-by: Alexei Starovoitov <[email protected]>
2018-10-18selftests/bpf: fix file resource leak in load_kallsymsPeng Hao1-0/+1
FILE pointer variable f is opened but never closed. Signed-off-by: Peng Hao <[email protected]> Signed-off-by: Daniel Borkmann <[email protected]>
2018-06-27trace_helpers.c: Add helpers to poll multiple perf FDs for eventsToke Høiland-Jørgensen1-2/+46
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 <[email protected]> Signed-off-by: Toke Høiland-Jørgensen <[email protected]> Acked-by: Song Liu <[email protected]> Signed-off-by: Daniel Borkmann <[email protected]>
2018-05-24tools/bpf: add ksym_get_addr() in trace_helpersYonghong Song1-0/+12
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 <[email protected]> Signed-off-by: Yonghong Song <[email protected]> Signed-off-by: Alexei Starovoitov <[email protected]>
2018-05-11tools: bpf: move the event reading loop to libbpfJakub Kicinski1-57/+30
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 <[email protected]> Signed-off-by: Jakub Kicinski <[email protected]> Reviewed-by: Quentin Monnet <[email protected]> Signed-off-by: Daniel Borkmann <[email protected]>
2018-04-29samples/bpf: move common-purpose trace functions to selftestsYonghong Song1-0/+180
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 <[email protected]> Signed-off-by: Yonghong Song <[email protected]> Signed-off-by: Alexei Starovoitov <[email protected]>
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