Test case to check if BPF_F_PROG_NO_CHARGE valid.
The result as follows,
$ ./test_progs
...
#103 no_charge:OK
...
Signed-off-by: Yafang Shao <laoar.shao@xxxxxxxxx>
---
.../selftests/bpf/prog_tests/no_charge.c | 49 +++++++++++++++++++
1 file changed, 49 insertions(+)
create mode 100644 tools/testing/selftests/bpf/prog_tests/no_charge.c
diff --git a/tools/testing/selftests/bpf/prog_tests/no_charge.c b/tools/testing/selftests/bpf/prog_tests/no_charge.c
new file mode 100644
index 000000000000..85fbd2ccbc71
--- /dev/null
+++ b/tools/testing/selftests/bpf/prog_tests/no_charge.c
@@ -0,0 +1,49 @@
+// SPDX-License-Identifier: GPL-2.0
+#include <unistd.h>
+#include <errno.h>
+#include <string.h>
+#include <linux/bpf.h>
+#include <sys/syscall.h>
+
+#include "test_progs.h"
+
+#define BPF_ALU64_IMM(OP, DST, IMM) \
+ ((struct bpf_insn) { \
+ .code = BPF_ALU64 | BPF_OP(OP) | BPF_K, \
+ .dst_reg = DST, \
+ .src_reg = 0, \
+ .off = 0, \
+ .imm = IMM })
+
+#define BPF_EXIT_INSN() \
+ ((struct bpf_insn) { \
+ .code = BPF_JMP | BPF_EXIT, \
+ .dst_reg = 0, \
+ .src_reg = 0, \
+ .off = 0, \
+ .imm = 0 })
+
+void test_no_charge(void)
+{
+ struct bpf_insn prog[] = {
+ BPF_ALU64_IMM(BPF_MOV, BPF_REG_0, 0),
+ BPF_EXIT_INSN(),
+ };
+ union bpf_attr attr;
+ int duration = 0;
+ int fd;
+
+ bzero(&attr, sizeof(attr));
+ attr.prog_type = BPF_PROG_TYPE_SCHED_CLS;
+ attr.insn_cnt = 2;
+ attr.insns = (__u64)prog;
+ attr.license = (__u64)("GPL");
+ attr.prog_flags |= BPF_F_PROG_NO_CHARGE;
+
+ fd = syscall(__NR_bpf, BPF_PROG_LOAD, &attr, sizeof(attr));
+ CHECK(fd < 0 && fd != -EPERM, "no_charge", "error: %s\n",
+ strerror(errno));
+
+ if (fd > 0)
+ close(fd);
+}
--
2.17.1
