diff mbox series

[bpf-next,05/10] libbpf: Add helpers for bpf_dynptr_user

Message ID 20220917153125.2001645-6-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: 0 this patch: 0
netdev/cc_maintainers warning 2 maintainers not CCed: song@kernel.org martin.lau@linux.dev
netdev/build_clang success Errors and warnings before: 0 this patch: 0
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: 0 this patch: 0
netdev/checkpatch warning WARNING: line length of 82 exceeds 80 columns WARNING: line length of 95 exceeds 80 columns
netdev/kdoc success Errors and warnings before: 8 this patch: 8
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 bpf_dynptr_user_init() to initialize a bpf_dynptr, and
bpf_dynptr_user_get_{data,size} to get the buffer address
and buffer length of bpf_dynptr_user.

Instead of exporting these symbols, simply adding these helpers as
inline functions.

Signed-off-by: Hou Tao <houtao1@huawei.com>
---
 tools/lib/bpf/bpf.h | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)
diff mbox series

Patch

diff --git a/tools/lib/bpf/bpf.h b/tools/lib/bpf/bpf.h
index 9c50beabdd14..cd3e9dbaffa1 100644
--- a/tools/lib/bpf/bpf.h
+++ b/tools/lib/bpf/bpf.h
@@ -371,6 +371,25 @@  LIBBPF_API int bpf_btf_get_fd_by_id(__u32 id);
 LIBBPF_API int bpf_link_get_fd_by_id(__u32 id);
 LIBBPF_API int bpf_obj_get_info_by_fd(int bpf_fd, void *info, __u32 *info_len);
 
+/* sys_bpf() will check the validity of size */
+static inline void bpf_dynptr_user_init(void *data, __u32 size, struct bpf_dynptr_user *dynptr)
+{
+	/* Zero padding bytes */
+	memset(dynptr, 0, sizeof(*dynptr));
+	dynptr->data = (__u64)(unsigned long)data;
+	dynptr->size = size;
+}
+
+static inline __u32 bpf_dynptr_user_get_size(const struct bpf_dynptr_user *dynptr)
+{
+	return dynptr->size;
+}
+
+static inline void *bpf_dynptr_user_get_data(const struct bpf_dynptr_user *dynptr)
+{
+	return (void *)(unsigned long)dynptr->data;
+}
+
 struct bpf_prog_query_opts {
 	size_t sz; /* size of this struct for forward/backward compatibility */
 	__u32 query_flags;