new file mode 100644
@@ -0,0 +1,55 @@
+// SPDX-License-Identifier: GPL-2.0
+#include <test_progs.h>
+
+#define IFINDEX_LO 1
+
+void test_xdp_attach(void)
+{
+ struct bpf_object *obj1, *obj2, *obj3;
+ const char *file = "./test_xdp.o";
+ int err, fd1, fd2, fd3;
+ __u32 duration = 0;
+
+ err = bpf_prog_load(file, BPF_PROG_TYPE_XDP, &obj1, &fd1);
+ if (CHECK_FAIL(err))
+ return;
+ err = bpf_prog_load(file, BPF_PROG_TYPE_XDP, &obj2, &fd2);
+ if (CHECK_FAIL(err))
+ goto out_1;
+ err = bpf_prog_load(file, BPF_PROG_TYPE_XDP, &obj3, &fd3);
+ if (CHECK_FAIL(err))
+ goto out_2;
+
+ err = bpf_set_link_xdp_fd_replace(IFINDEX_LO, fd1, -1, 0);
+ if (CHECK(err, "load_ok", "initial load failed"))
+ goto out_close;
+
+ err = bpf_set_link_xdp_fd_replace(IFINDEX_LO, fd2, -1, 0);
+ if (CHECK(!err, "load_fail", "load with expected fd didn't fail"))
+ goto out;
+
+ err = bpf_set_link_xdp_fd_replace(IFINDEX_LO, fd2, fd1, 0);
+ if (CHECK(err, "replace_ok", "replace valid old_fd failed"))
+ goto out;
+
+ err = bpf_set_link_xdp_fd_replace(IFINDEX_LO, fd3, fd1, 0);
+ if (CHECK(!err, "replace_fail", "replace invalid old_fd didn't fail"))
+ goto out;
+
+ err = bpf_set_link_xdp_fd_replace(IFINDEX_LO, -1, fd1, 0);
+ if (CHECK(!err, "remove_fail", "remove invalid old_fd didn't fail"))
+ goto out;
+
+ err = bpf_set_link_xdp_fd_replace(IFINDEX_LO, -1, fd2, 0);
+ if (CHECK(err, "remove_ok", "remove valid old_fd failed"))
+ goto out;
+
+out:
+ bpf_set_link_xdp_fd(IFINDEX_LO, -1, 0);
+out_close:
+ bpf_object__close(obj3);
+out_2:
+ bpf_object__close(obj2);
+out_1:
+ bpf_object__close(obj1);
+}