bpf: Move __kfunc_param_match_suffix() to btf.c.

Move __kfunc_param_match_suffix() to btf.c and rename it as
btf_param_match_suffix(). It can be reused by bpf_struct_ops later.

Signed-off-by: Kui-Feng Lee <thinker.li@gmail.com>
Link: https://lore.kernel.org/r/20240209023750.1153905-3-thinker.li@gmail.com
Signed-off-by: Martin KaFai Lau <martin.lau@kernel.org>

1 files changed, 18 insertions, 0 deletions

diff --git a/kernel/bpf/btf.c b/kernel/bpf/btf.c
index cf100b5573ca..447da964f217 100644
--- a/kernel/bpf/btf.c
+++ b/kernel/bpf/btf.c
@@ -8904,3 +8904,21 @@ errout:
 }
 EXPORT_SYMBOL_GPL(__register_bpf_struct_ops);
 #endif
+
+bool btf_param_match_suffix(const struct btf *btf,
+			    const struct btf_param *arg,
+			    const char *suffix)
+{
+	int suffix_len = strlen(suffix), len;
+	const char *param_name;
+
+	/* In the future, this can be ported to use BTF tagging */
+	param_name = btf_name_by_offset(btf, arg->name_off);
+	if (str_is_empty(param_name))
+		return false;
+	len = strlen(param_name);
+	if (len <= suffix_len)
+		return false;
+	param_name += len - suffix_len;
+	return !strncmp(param_name, suffix, suffix_len);
+}