selftests/bpf: Move test_progs helpers to testing_helpers object
Moving test_progs helpers to testing_helpers object so they can be
used from test_verifier in following changes.
Also adding missing ifndef header guard to testing_helpers.h header.
Using stderr instead of env.stderr because un/load_bpf_testmod helpers
will be used outside test_progs. Also at the point of calling them
in test_progs the std files are not hijacked yet and stderr is the
same as env.stderr.
Acked-by: David Vernet <void@manifault.com>
Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Link: https://lore.kernel.org/r/20230515133756.1658301-4-jolsa@kernel.org
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
diff --git a/tools/testing/selftests/bpf/testing_helpers.c b/tools/testing/selftests/bpf/testing_helpers.c
index dc9595a..648c7d3 100644
--- a/tools/testing/selftests/bpf/testing_helpers.c
+++ b/tools/testing/selftests/bpf/testing_helpers.c
@@ -9,6 +9,7 @@
#include <bpf/libbpf.h>
#include "test_progs.h"
#include "testing_helpers.h"
+#include <linux/membarrier.h>
int parse_num_list(const char *s, bool **num_set, int *num_set_len)
{
@@ -326,3 +327,65 @@ __u64 read_perf_max_sample_freq(void)
fclose(f);
return sample_freq;
}
+
+static int finit_module(int fd, const char *param_values, int flags)
+{
+ return syscall(__NR_finit_module, fd, param_values, flags);
+}
+
+static int delete_module(const char *name, int flags)
+{
+ return syscall(__NR_delete_module, name, flags);
+}
+
+void unload_bpf_testmod(bool verbose)
+{
+ if (kern_sync_rcu())
+ fprintf(stderr, "Failed to trigger kernel-side RCU sync!\n");
+ if (delete_module("bpf_testmod", 0)) {
+ if (errno == ENOENT) {
+ if (verbose)
+ fprintf(stdout, "bpf_testmod.ko is already unloaded.\n");
+ return;
+ }
+ fprintf(stderr, "Failed to unload bpf_testmod.ko from kernel: %d\n", -errno);
+ return;
+ }
+ if (verbose)
+ fprintf(stdout, "Successfully unloaded bpf_testmod.ko.\n");
+}
+
+int load_bpf_testmod(bool verbose)
+{
+ int fd;
+
+ /* ensure previous instance of the module is unloaded */
+ unload_bpf_testmod(verbose);
+
+ if (verbose)
+ fprintf(stdout, "Loading bpf_testmod.ko...\n");
+
+ fd = open("bpf_testmod.ko", O_RDONLY);
+ if (fd < 0) {
+ fprintf(stderr, "Can't find bpf_testmod.ko kernel module: %d\n", -errno);
+ return -ENOENT;
+ }
+ if (finit_module(fd, "", 0)) {
+ fprintf(stderr, "Failed to load bpf_testmod.ko into the kernel: %d\n", -errno);
+ close(fd);
+ return -EINVAL;
+ }
+ close(fd);
+
+ if (verbose)
+ fprintf(stdout, "Successfully loaded bpf_testmod.ko.\n");
+ return 0;
+}
+
+/*
+ * Trigger synchronize_rcu() in kernel.
+ */
+int kern_sync_rcu(void)
+{
+ return syscall(__NR_membarrier, MEMBARRIER_CMD_SHARED, 0, 0);
+}
