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authorAlexei Starovoitov <ast@fb.com>2016-04-06 18:43:29 -0700
committerDavid S. Miller <davem@davemloft.net>2016-04-07 21:04:27 -0400
commitc07660409ec954403776200cec1dd04b2db851f8 (patch)
tree249cad46d3462c443e4ae9c7f8dc87f489a1ec95 /samples/bpf/bpf_load.c
parent32bbe0078afe86a8bf4c67c6b3477781b15e94dc (diff)
downloadlinux-stericsson-c07660409ec954403776200cec1dd04b2db851f8.tar.gz
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/bpf_load.c')
-rw-r--r--samples/bpf/bpf_load.c26
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);
}