Introduce kernel selftest for new bpf_xdp_{load,store}_bytes helpers.
and bpf_xdp_pointer/bpf_xdp_copy_buf utility routines.
Signed-off-by: Lorenzo Bianconi <lorenzo@xxxxxxxxxx>
---
.../bpf/prog_tests/xdp_adjust_frags.c | 81 +++++++++++++++++++
.../bpf/progs/test_xdp_update_frags.c | 42 ++++++++++
2 files changed, 123 insertions(+)
create mode 100644 tools/testing/selftests/bpf/prog_tests/xdp_adjust_frags.c
create mode 100644 tools/testing/selftests/bpf/progs/test_xdp_update_frags.c
diff --git a/tools/testing/selftests/bpf/prog_tests/xdp_adjust_frags.c b/tools/testing/selftests/bpf/prog_tests/xdp_adjust_frags.c
new file mode 100644
index 000000000000..53febbcb8fd4
--- /dev/null
+++ b/tools/testing/selftests/bpf/prog_tests/xdp_adjust_frags.c
@@ -0,0 +1,81 @@
+// SPDX-License-Identifier: GPL-2.0
+#include <test_progs.h>
+#include <network_helpers.h>
+
+void test_xdp_update_frags(void)
+{
+ const char *file = "./test_xdp_update_frags.o";
+ __u32 duration, retval, size;
+ struct bpf_object *obj;
+ int err, prog_fd;
+ __u32 *offset;
+ __u8 *buf;
+
+ err = bpf_prog_load(file, BPF_PROG_TYPE_XDP, &obj, &prog_fd);
+ if (CHECK_FAIL(err))
+ return;
+
+ buf = malloc(128);
+ if (CHECK(!buf, "malloc()", "error:%s\n", strerror(errno)))
+ return;
+
+ memset(buf, 0, 128);
+ offset = (__u32 *)buf;
+ *offset = 16;
+ buf[*offset] = 0xaa; /* marker at offset 16 */
+ buf[*offset + 15] = 0xaa; /* marker at offset 31 */
+
+ err = bpf_prog_test_run(prog_fd, 1, buf, 128,
+ buf, &size, &retval, &duration);
+
+ /* test_xdp_update_frags: buf[16,31]: 0xaa -> 0xbb */
+ CHECK(err || retval != XDP_PASS || buf[16] != 0xbb || buf[31] != 0xbb,
+ "128b", "err %d errno %d retval %d size %d\n",
+ err, errno, retval, size);
+
+ free(buf);
+
+ buf = malloc(9000);
+ if (CHECK(!buf, "malloc()", "error:%s\n", strerror(errno)))
+ return;
+
+ memset(buf, 0, 9000);
+ offset = (__u32 *)buf;
+ *offset = 5000;
+ buf[*offset] = 0xaa; /* marker at offset 5000 (frag0) */
+ buf[*offset + 15] = 0xaa; /* marker at offset 5015 (frag0) */
+
+ err = bpf_prog_test_run(prog_fd, 1, buf, 9000,
+ buf, &size, &retval, &duration);
+
+ /* test_xdp_update_frags: buf[5000,5015]: 0xaa -> 0xbb */
+ CHECK(err || retval != XDP_PASS ||
+ buf[5000] != 0xbb || buf[5015] != 0xbb,
+ "9000b", "err %d errno %d retval %d size %d\n",
+ err, errno, retval, size);
+
+ memset(buf, 0, 9000);
+ offset = (__u32 *)buf;
+ *offset = 3510;
+ buf[*offset] = 0xaa; /* marker at offset 3510 (head) */
+ buf[*offset + 15] = 0xaa; /* marker at offset 3525 (frag0) */
+
+ err = bpf_prog_test_run(prog_fd, 1, buf, 9000,
+ buf, &size, &retval, &duration);
+
+ /* test_xdp_update_frags: buf[3510,3525]: 0xaa -> 0xbb */
+ CHECK(err || retval != XDP_PASS ||
+ buf[3510] != 0xbb || buf[3525] != 0xbb,
+ "9000b", "err %d errno %d retval %d size %d\n",
+ err, errno, retval, size);
+
+ free(buf);
+
+ bpf_object__close(obj);
+}
+
+void test_xdp_adjust_frags(void)
+{
+ if (test__start_subtest("xdp_adjust_frags"))
+ test_xdp_update_frags();
+}
diff --git a/tools/testing/selftests/bpf/progs/test_xdp_update_frags.c b/tools/testing/selftests/bpf/progs/test_xdp_update_frags.c
new file mode 100644
index 000000000000..78224df81df6
--- /dev/null
+++ b/tools/testing/selftests/bpf/progs/test_xdp_update_frags.c
@@ -0,0 +1,42 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of version 2 of the GNU General Public
+ * License as published by the Free Software Foundation.
+ */
+#include <linux/bpf.h>
+#include <linux/if_ether.h>
+#include <bpf/bpf_helpers.h>
+
+int _version SEC("version") = 1;
+
+SEC("xdp_adjust_frags")
+int _xdp_adjust_frags(struct xdp_md *xdp)
+{
+ __u8 *data_end = (void *)(long)xdp->data_end;
+ __u8 *data = (void *)(long)xdp->data;
+ __u32 offset;
+ __u8 val[16];
+ int err;
+
+ if (data + sizeof(__u32) > data_end)
+ return XDP_DROP;
+
+ offset = *(__u32 *)data;
+ err = bpf_xdp_load_bytes(xdp, offset, val, sizeof(val));
+ if (err < 0)
+ return XDP_DROP;
+
+ if (val[0] != 0xaa || val[15] != 0xaa) /* marker */
+ return XDP_DROP;
+
+ val[0] = 0xbb; /* update the marker */
+ val[15] = 0xbb;
+ err = bpf_xdp_store_bytes(xdp, offset, val, sizeof(val));
+ if (err < 0)
+ return XDP_DROP;
+
+ return XDP_PASS;
+}
+
+char _license[] SEC("license") = "GPL";
--
2.31.1
