From: Hou Tao <houtao1@xxxxxxxxxx>
Add helper btf_type_is_bpf_dynptr() to check whether or not the passed
btf type is bpf_dynptr. It will be used by bpf map (e.g. qp-trie) which
uses bpf_dynptr as map key.
Signed-off-by: Hou Tao <houtao1@xxxxxxxxxx>
---
include/linux/btf.h | 1 +
kernel/bpf/btf.c | 7 +++++++
2 files changed, 8 insertions(+)
diff --git a/include/linux/btf.h b/include/linux/btf.h
index 1fcc833a8690..d52f9979ea49 100644
--- a/include/linux/btf.h
+++ b/include/linux/btf.h
@@ -156,6 +156,7 @@ int btf_find_spin_lock(const struct btf *btf, const struct btf_type *t);
int btf_find_timer(const struct btf *btf, const struct btf_type *t);
struct bpf_map_value_off *btf_parse_kptrs(const struct btf *btf,
const struct btf_type *t);
+bool btf_type_is_bpf_dynptr(const struct btf *btf, const struct btf_type *t);
bool btf_type_is_void(const struct btf_type *t);
s32 btf_find_by_name_kind(const struct btf *btf, const char *name, u8 kind);
const struct btf_type *btf_type_skip_modifiers(const struct btf *btf,
diff --git a/kernel/bpf/btf.c b/kernel/bpf/btf.c
index b3940c605aac..f94b6112a649 100644
--- a/kernel/bpf/btf.c
+++ b/kernel/bpf/btf.c
@@ -3522,6 +3522,13 @@ struct bpf_map_value_off *btf_parse_kptrs(const struct btf *btf,
return ERR_PTR(ret);
}
+bool btf_type_is_bpf_dynptr(const struct btf *btf, const struct btf_type *t)
+{
+ return __btf_type_is_struct(t) &&
+ t->size == sizeof(struct bpf_dynptr) &&
+ !strcmp("bpf_dynptr", __btf_name_by_offset(btf, t->name_off));
+}
+
static void __btf_struct_show(const struct btf *btf, const struct btf_type *t,
u32 type_id, void *data, u8 bits_offset,
struct btf_show *show)
--
2.29.2
