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| author | Alexei Starovoitov <ast@fb.com> | 2016-04-06 18:43:29 -0700 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2016-04-07 21:04:27 -0400 |
| commit | c07660409ec954403776200cec1dd04b2db851f8 (patch) | |
| tree | 249cad46d3462c443e4ae9c7f8dc87f489a1ec95 /samples/bpf | |
| parent | 32bbe0078afe86a8bf4c67c6b3477781b15e94dc (diff) | |
| download | linux-c07660409ec954403776200cec1dd04b2db851f8.tar.gz linux-c07660409ec954403776200cec1dd04b2db851f8.tar.bz2 linux-c07660409ec954403776200cec1dd04b2db851f8.zip | |
samples/bpf: add tracepoint support to bpf loader
Recognize "tracepoint/" section name prefix and attach the program
to that tracepoint.
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'samples/bpf')
| -rw-r--r-- | samples/bpf/bpf_load.c | 26 |
1 files changed, 21 insertions, 5 deletions
diff --git a/samples/bpf/bpf_load.c b/samples/bpf/bpf_load.c index 58f86bd11b3d..022af71c2bb5 100644 --- a/samples/bpf/bpf_load.c +++ b/samples/bpf/bpf_load.c @@ -49,6 +49,7 @@ static int load_and_attach(const char *event, struct bpf_insn *prog, int size) bool is_socket = strncmp(event, "socket", 6) == 0; bool is_kprobe = strncmp(event, "kprobe/", 7) == 0; bool is_kretprobe = strncmp(event, "kretprobe/", 10) == 0; + bool is_tracepoint = strncmp(event, "tracepoint/", 11) == 0; enum bpf_prog_type prog_type; char buf[256]; int fd, efd, err, id; @@ -63,6 +64,8 @@ static int load_and_attach(const char *event, struct bpf_insn *prog, int size) prog_type = BPF_PROG_TYPE_SOCKET_FILTER; } else if (is_kprobe || is_kretprobe) { prog_type = BPF_PROG_TYPE_KPROBE; + } else if (is_tracepoint) { + prog_type = BPF_PROG_TYPE_TRACEPOINT; } else { printf("Unknown event '%s'\n", event); return -1; @@ -111,12 +114,23 @@ static int load_and_attach(const char *event, struct bpf_insn *prog, int size) event, strerror(errno)); return -1; } - } - strcpy(buf, DEBUGFS); - strcat(buf, "events/kprobes/"); - strcat(buf, event); - strcat(buf, "/id"); + strcpy(buf, DEBUGFS); + strcat(buf, "events/kprobes/"); + strcat(buf, event); + strcat(buf, "/id"); + } else if (is_tracepoint) { + event += 11; + + if (*event == 0) { + printf("event name cannot be empty\n"); + return -1; + } + strcpy(buf, DEBUGFS); + strcat(buf, "events/"); + strcat(buf, event); + strcat(buf, "/id"); + } efd = open(buf, O_RDONLY, 0); if (efd < 0) { @@ -304,6 +318,7 @@ int load_bpf_file(char *path) if (memcmp(shname_prog, "kprobe/", 7) == 0 || memcmp(shname_prog, "kretprobe/", 10) == 0 || + memcmp(shname_prog, "tracepoint/", 11) == 0 || memcmp(shname_prog, "socket", 6) == 0) load_and_attach(shname_prog, insns, data_prog->d_size); } @@ -320,6 +335,7 @@ int load_bpf_file(char *path) if (memcmp(shname, "kprobe/", 7) == 0 || memcmp(shname, "kretprobe/", 10) == 0 || + memcmp(shname, "tracepoint/", 11) == 0 || memcmp(shname, "socket", 6) == 0) load_and_attach(shname, data->d_buf, data->d_size); } |