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authorYonghong Song <yhs@fb.com>2017-10-23 23:53:09 -0700
committerDavid S. Miller <davem@davemloft.net>2017-10-25 10:47:47 +0900
commita678be5cc747bafc8c66f2fe00a103422587a5eb (patch)
treec2d0ca52a82c862c8e2a5623ba2d76fdb9a19052 /samples
parentbpf: permit multiple bpf attachments for a single perf event (diff)
downloadlinux-dev-a678be5cc747bafc8c66f2fe00a103422587a5eb.tar.xz
linux-dev-a678be5cc747bafc8c66f2fe00a103422587a5eb.zip
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>
Diffstat (limited to 'samples')
-rw-r--r--samples/bpf/syscall_tp_user.c66
1 files changed, 53 insertions, 13 deletions
diff --git a/samples/bpf/syscall_tp_user.c b/samples/bpf/syscall_tp_user.c
index a3cb91ebf4e7..9169d3207f18 100644
--- a/samples/bpf/syscall_tp_user.c
+++ b/samples/bpf/syscall_tp_user.c
@@ -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);
+}