Use bpf_prog_test_run_opts to test the skb_load_bytes function.
Tests the behavior when offset is greater than INT_MAX or a normal value.
Signed-off-by: Liu Jian <liujian56@xxxxxxxxxx>
---
v1->v2: As Liu Song's review comments, use bpf skeleton and global variable.
.../selftests/bpf/prog_tests/skb_load_bytes.c | 45 +++++++++++++++++++
.../selftests/bpf/progs/skb_load_bytes.c | 19 ++++++++
2 files changed, 64 insertions(+)
create mode 100644 tools/testing/selftests/bpf/prog_tests/skb_load_bytes.c
create mode 100644 tools/testing/selftests/bpf/progs/skb_load_bytes.c
diff --git a/tools/testing/selftests/bpf/prog_tests/skb_load_bytes.c b/tools/testing/selftests/bpf/prog_tests/skb_load_bytes.c
new file mode 100644
index 000000000000..81cc224a0c69
--- /dev/null
+++ b/tools/testing/selftests/bpf/prog_tests/skb_load_bytes.c
@@ -0,0 +1,45 @@
+// SPDX-License-Identifier: GPL-2.0
+#include <test_progs.h>
+#include <network_helpers.h>
+#include "skb_load_bytes.skel.h"
+
+void test_skb_load_bytes(void)
+{
+ struct skb_load_bytes *skel;
+ int err, prog_fd, test_result;
+ struct __sk_buff skb = { 0 };
+
+ LIBBPF_OPTS(bpf_test_run_opts, tattr,
+ .data_in = &pkt_v4,
+ .data_size_in = sizeof(pkt_v4),
+ .ctx_in = &skb,
+ .ctx_size_in = sizeof(skb),
+ );
+
+ skel = skb_load_bytes__open_and_load();
+ if (!ASSERT_OK_PTR(skel, "skel_open_and_load"))
+ return;
+
+ prog_fd = bpf_program__fd(skel->progs.skb_process);
+ if (prog_fd < 0)
+ goto out;
+
+ skel->bss->load_offset = (uint32_t)(-1);
+ tattr.data_out = NULL;
+ tattr.data_size_out = 0;
+ err = bpf_prog_test_run_opts(prog_fd, &tattr);
+ CHECK_ATTR(err != 0, "offset -1", "err %d errno %d\n", err, errno);
+ test_result = skel->bss->test_result;
+ CHECK_ATTR(test_result != -EFAULT, "offset -1", "test error\n");
+
+ skel->bss->load_offset = (uint32_t)10;
+ tattr.data_out = NULL;
+ tattr.data_size_out = 0;
+ err = bpf_prog_test_run_opts(prog_fd, &tattr);
+ CHECK_ATTR(err != 0, "offset 10", "err %d errno %d\n", err, errno);
+ test_result = skel->bss->test_result;
+ CHECK_ATTR(test_result != 0, "offset 10", "test error\n");
+
+out:
+ skb_load_bytes__destroy(skel);
+}
diff --git a/tools/testing/selftests/bpf/progs/skb_load_bytes.c b/tools/testing/selftests/bpf/progs/skb_load_bytes.c
new file mode 100644
index 000000000000..e4252fd973be
--- /dev/null
+++ b/tools/testing/selftests/bpf/progs/skb_load_bytes.c
@@ -0,0 +1,19 @@
+// SPDX-License-Identifier: GPL-2.0
+
+#include <linux/bpf.h>
+#include <bpf/bpf_helpers.h>
+
+char _license[] SEC("license") = "GPL";
+
+__u32 load_offset = 0;
+int test_result = 0;
+
+SEC("tc")
+int skb_process(struct __sk_buff *skb)
+{
+ char buf[16];
+
+ test_result = bpf_skb_load_bytes(skb, load_offset, buf, 10);
+
+ return 0;
+}
--
2.17.1
