selftests/bpf: Add bpf_dynptr_user_init() helper

Add bpf_dynptr_user_init() to initialize a bpf_dynptr_user object. It will be used test_progs and bench. User can dereference the {data|size} fields directly to get the address and length of the dynptr object. Signed-off-by: Hou Tao <[email protected]>
kernel-patches · Jan 25, 2025 · 664d6b0 · 664d6b0
1 parent 2490d71
commit 664d6b0
Showing 1 changed file with 9 additions and 0 deletions.
diff --git a/tools/testing/selftests/bpf/bpf_util.h b/tools/testing/selftests/bpf/bpf_util.h
@@ -71,4 +71,13 @@ static inline void bpf_strlcpy(char *dst, const char *src, size_t sz)
 #define ENOTSUPP 524
 #endif
 
+/* sys_bpf() will check the validity of data and size */
+static inline void bpf_dynptr_user_init(void *data, __u32 size,
+					struct bpf_dynptr_user *dynptr)
+{
+	dynptr->data = data;
+	dynptr->size = size;
+	dynptr->reserved = 0;
+}
+
 #endif /* __BPF_UTIL__ */