kernel/tools/testing/selftests/bpf/trace_helpers.c, branch linux-5.2.y

selftests/bpf: ksym_search won't check symbols exists

2019-04-04T14:43:46Z

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 Signed-off-by: Daniel Borkmann

bpf, libbpf: simplify and cleanup perf ring buffer walk

2018-10-21T06:13:32Z

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 Signed-off-by: Alexei Starovoitov

selftests/bpf: fix file resource leak in load_kallsyms

2018-10-18T20:13:30Z

FILE pointer variable f is opened but never closed. Signed-off-by: Peng Hao Signed-off-by: Daniel Borkmann

trace_helpers.c: Add helpers to poll multiple perf FDs for events

2018-06-27T09:01:03Z

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 Signed-off-by: Toke Høiland-Jørgensen Acked-by: Song Liu Signed-off-by: Daniel Borkmann

tools/bpf: add ksym_get_addr() in trace_helpers

2018-05-25T01:18:20Z

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

tools: bpf: move the event reading loop to libbpf

2018-05-10T23:40:52Z

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

samples/bpf: move common-purpose trace functions to selftests

2018-04-29T15:45:54Z

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