On 3/18/25 7:33 AM, Anton Protopopov wrote:
Add self-tests to test new BPF_STATIC_BRANCH_JA jump instructions
and the BPF_STATIC_KEY_UPDATE syscall.
Signed-off-by: Anton Protopopov <aspsk@xxxxxxxxxxxxx>
---
.../bpf/prog_tests/bpf_static_keys.c | 359 ++++++++++++++++++
.../selftests/bpf/progs/bpf_static_keys.c | 131 +++++++
2 files changed, 490 insertions(+)
create mode 100644 tools/testing/selftests/bpf/prog_tests/bpf_static_keys.c
create mode 100644 tools/testing/selftests/bpf/progs/bpf_static_keys.c
diff --git a/tools/testing/selftests/bpf/prog_tests/bpf_static_keys.c b/tools/testing/selftests/bpf/prog_tests/bpf_static_keys.c
new file mode 100644
index 000000000000..3f105d36743b
--- /dev/null
+++ b/tools/testing/selftests/bpf/prog_tests/bpf_static_keys.c
@@ -0,0 +1,359 @@
+// SPDX-License-Identifier: GPL-2.0
+
+#include <test_progs.h>
+
+#include <sys/syscall.h>
+#include <bpf/bpf.h>
+
+#include "bpf_static_keys.skel.h"
+
+#define VAL_ON 7
+#define VAL_OFF 3
+
+enum {
+ OFF,
+ ON
+};
+
+static int _bpf_prog_load(struct bpf_insn *insns, __u32 insn_cnt)
+{
+ return bpf_prog_load(BPF_PROG_TYPE_XDP, NULL, "GPL", insns, insn_cnt, NULL);
+}
+
+static int _bpf_static_key_update(int map_fd, __u32 on)
+{
+ LIBBPF_OPTS(bpf_static_key_update_opts, opts);
+
+ opts.on = on;
+
+ return bpf_static_key_update(map_fd, &opts);
+}
+
+#define BPF_JMP32_OR_NOP(IMM, OFF) \
+ ((struct bpf_insn) { \
+ .code = BPF_JMP32 | BPF_JA | BPF_K, \
+ .dst_reg = 0, \
+ .src_reg = BPF_STATIC_BRANCH_JA, \
+ .off = OFF, \
+ .imm = IMM })
+
+#define BPF_JMP_OR_NOP(IMM, OFF) \
+ ((struct bpf_insn) { \
+ .code = BPF_JMP | BPF_JA | BPF_K, \
+ .dst_reg = 0, \
+ .src_reg = BPF_STATIC_BRANCH_JA, \
+ .off = OFF, \
+ .imm = IMM })
+
+#define BPF_NOP_OR_JMP32(IMM, OFF) \
+ ((struct bpf_insn) { \
+ .code = BPF_JMP32 | BPF_JA | BPF_K, \
+ .dst_reg = 0, \
+ .src_reg = BPF_STATIC_BRANCH_JA | \
+ BPF_STATIC_BRANCH_NOP, \
+ .off = OFF, \
+ .imm = IMM })
+
+#define BPF_NOP_OR_JMP(IMM, OFF) \
+ ((struct bpf_insn) { \
+ .code = BPF_JMP | BPF_JA | BPF_K, \
+ .dst_reg = 0, \
+ .src_reg = BPF_STATIC_BRANCH_JA | \
+ BPF_STATIC_BRANCH_NOP, \
+ .off = OFF, \
+ .imm = IMM })
+
+static const struct bpf_insn insns0[] = {
+ BPF_JMP_OR_NOP(0, 1),
+ BPF_NOP_OR_JMP(0, 1),
+ BPF_JMP32_OR_NOP(1, 0),
+ BPF_NOP_OR_JMP32(1, 0),
+};
+
[...]
+
+static void check_bpf_to_bpf_call(struct bpf_static_keys *skel,
+ struct bpf_map *key1,
+ struct bpf_map *key2)
+{
+ struct bpf_link *link;
+
+ link = bpf_program__attach(skel->progs.check_bpf_to_bpf_call);
there is no progcheck_bpf_to_bpf_call. Compilation will fail.
+ if (!ASSERT_OK_PTR(link, "link"))
+ return;
+
+ __check_multiple_keys(skel, key1, key2, 0, 303, 3030, 3333);
+
+ bpf_link__destroy(link);
+}
+
[...]
