bpf: add a test case to test single tp multiple bpf attachment
The bpf sample program syscall_tp is modified to show attachment of more than bpf programs for a particular kernel tracepoint. Signed-off-by: Yonghong Song <yhs@fb.com> Acked-by: Alexei Starovoitov <ast@kernel.org> Acked-by: Martin KaFai Lau <kafai@fb.com> Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
parent
e87c6bc385
commit
a678be5cc7
|
@ -23,6 +23,13 @@
|
|||
* This requires kernel CONFIG_FTRACE_SYSCALLS to be set.
|
||||
*/
|
||||
|
||||
static void usage(const char *cmd)
|
||||
{
|
||||
printf("USAGE: %s [-i num_progs] [-h]\n", cmd);
|
||||
printf(" -i num_progs # number of progs of the test\n");
|
||||
printf(" -h # help\n");
|
||||
}
|
||||
|
||||
static void verify_map(int map_id)
|
||||
{
|
||||
__u32 key = 0;
|
||||
|
@ -32,22 +39,29 @@ static void verify_map(int map_id)
|
|||
fprintf(stderr, "map_lookup failed: %s\n", strerror(errno));
|
||||
return;
|
||||
}
|
||||
if (val == 0)
|
||||
if (val == 0) {
|
||||
fprintf(stderr, "failed: map #%d returns value 0\n", map_id);
|
||||
return;
|
||||
}
|
||||
val = 0;
|
||||
if (bpf_map_update_elem(map_id, &key, &val, BPF_ANY) != 0) {
|
||||
fprintf(stderr, "map_update failed: %s\n", strerror(errno));
|
||||
return;
|
||||
}
|
||||
}
|
||||
|
||||
int main(int argc, char **argv)
|
||||
static int test(char *filename, int num_progs)
|
||||
{
|
||||
struct rlimit r = {RLIM_INFINITY, RLIM_INFINITY};
|
||||
char filename[256];
|
||||
int fd;
|
||||
int i, fd, map0_fds[num_progs], map1_fds[num_progs];
|
||||
|
||||
setrlimit(RLIMIT_MEMLOCK, &r);
|
||||
snprintf(filename, sizeof(filename), "%s_kern.o", argv[0]);
|
||||
|
||||
if (load_bpf_file(filename)) {
|
||||
fprintf(stderr, "%s", bpf_log_buf);
|
||||
return 1;
|
||||
for (i = 0; i < num_progs; i++) {
|
||||
if (load_bpf_file(filename)) {
|
||||
fprintf(stderr, "%s", bpf_log_buf);
|
||||
return 1;
|
||||
}
|
||||
printf("prog #%d: map ids %d %d\n", i, map_fd[0], map_fd[1]);
|
||||
map0_fds[i] = map_fd[0];
|
||||
map1_fds[i] = map_fd[1];
|
||||
}
|
||||
|
||||
/* current load_bpf_file has perf_event_open default pid = -1
|
||||
|
@ -64,8 +78,34 @@ int main(int argc, char **argv)
|
|||
close(fd);
|
||||
|
||||
/* verify the map */
|
||||
verify_map(map_fd[0]);
|
||||
verify_map(map_fd[1]);
|
||||
for (i = 0; i < num_progs; i++) {
|
||||
verify_map(map0_fds[i]);
|
||||
verify_map(map1_fds[i]);
|
||||
}
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
int main(int argc, char **argv)
|
||||
{
|
||||
struct rlimit r = {RLIM_INFINITY, RLIM_INFINITY};
|
||||
int opt, num_progs = 1;
|
||||
char filename[256];
|
||||
|
||||
while ((opt = getopt(argc, argv, "i:h")) != -1) {
|
||||
switch (opt) {
|
||||
case 'i':
|
||||
num_progs = atoi(optarg);
|
||||
break;
|
||||
case 'h':
|
||||
default:
|
||||
usage(argv[0]);
|
||||
return 0;
|
||||
}
|
||||
}
|
||||
|
||||
setrlimit(RLIMIT_MEMLOCK, &r);
|
||||
snprintf(filename, sizeof(filename), "%s_kern.o", argv[0]);
|
||||
|
||||
return test(filename, num_progs);
|
||||
}
|
||||
|
|
Loading…
Reference in a new issue