diff mbox series

[bpf-next,02/10] bpf: Add helper btf_type_is_bpf_dynptr()

Message ID 20220917153125.2001645-3-houtao@huaweicloud.com (mailing list archive)
State Changes Requested
Delegated to: BPF
Headers show
Series Add support for qp-trie map | expand

Checks

Context Check Description
netdev/tree_selection success Clearly marked for bpf-next, async
netdev/fixes_present success Fixes tag not required for -next series
netdev/subject_prefix success Link
netdev/cover_letter success Series has a cover letter
netdev/patch_count success Link
netdev/header_inline success No static functions without inline keyword in header files
netdev/build_32bit success Errors and warnings before: 1363 this patch: 1363
netdev/cc_maintainers warning 2 maintainers not CCed: song@kernel.org martin.lau@linux.dev
netdev/build_clang success Errors and warnings before: 159 this patch: 159
netdev/module_param success Was 0 now: 0
netdev/verify_signedoff success Signed-off-by tag matches author and committer
netdev/check_selftest success No net selftest shell script
netdev/verify_fixes success No Fixes tag
netdev/build_allmodconfig_warn success Errors and warnings before: 1355 this patch: 1355
netdev/checkpatch success total: 0 errors, 0 warnings, 0 checks, 20 lines checked
netdev/kdoc success Errors and warnings before: 0 this patch: 0
netdev/source_inline success Was 0 now: 0
bpf/vmtest-bpf-next-PR fail PR summary
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Commit Message

Hou Tao Sept. 17, 2022, 3:31 p.m. UTC 
From: Hou Tao <houtao1@huawei.com>

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@huawei.com>
---
 include/linux/btf.h | 1 +
 kernel/bpf/btf.c    | 7 +++++++
 2 files changed, 8 insertions(+)
diff mbox series

Patch

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)