[PATCH bpf-next RFC v1 2/5] tools: sync bpf.h header

[Kumar Kartikeya Dwivedi]

Update the bpf.h UAPI header with changes made from file local storage
additions.

Signed-off-by: Kumar Kartikeya Dwivedi <memxor at gmail.com>
---
 tools/include/uapi/linux/bpf.h | 39 ++++++++++++++++++++++++++++++++++
 1 file changed, 39 insertions(+)

diff --git a/tools/include/uapi/linux/bpf.h b/tools/include/uapi/linux/bpf.h
index c4f7892edb2b..d4bf4e4d56b5 100644
--- a/tools/include/uapi/linux/bpf.h
+++ b/tools/include/uapi/linux/bpf.h
@@ -906,6 +906,7 @@ enum bpf_map_type {
 	BPF_MAP_TYPE_RINGBUF,
 	BPF_MAP_TYPE_INODE_STORAGE,
 	BPF_MAP_TYPE_TASK_STORAGE,
+	BPF_MAP_TYPE_FILE_STORAGE,
 };
 
 /* Note that tracing related programs such as
@@ -4871,6 +4872,42 @@ union bpf_attr {
  * 	Return
  *		Value specified by user at BPF link creation/attachment time
  *		or 0, if it was not specified.
+ *
+ * void *bpf_file_storage_get(struct bpf_map *map, void *file, void *value, u64 flags)
+ *	Description
+ *		Get a bpf_local_storage from a *file*.
+ *
+ *		Logically, it could be thought of as getting the value from
+ *		a *map* with *file* as the **key**.  From this
+ *		perspective,  the usage is not much different from
+ *		**bpf_map_lookup_elem**\ (*map*, **&**\ *file*) except this
+ *		helper enforces the key must be an file and the map must also
+ *		be a **BPF_MAP_TYPE_FILE_STORAGE**.
+ *
+ *		Underneath, the value is stored locally at *file* instead of
+ *		the *map*.  The *map* is used as the bpf-local-storage
+ *		"type". The bpf-local-storage "type" (i.e. the *map*) is
+ *		searched against all bpf_local_storage residing at *file*.
+ *
+ *		An optional *flags* (**BPF_LOCAL_STORAGE_GET_F_CREATE**) can be
+ *		used such that a new bpf_local_storage will be
+ *		created if one does not exist.  *value* can be used
+ *		together with **BPF_LOCAL_STORAGE_GET_F_CREATE** to specify
+ *		the initial value of a bpf_local_storage.  If *value* is
+ *		**NULL**, the new bpf_local_storage will be zero initialized.
+ *	Return
+ *		A bpf_local_storage pointer is returned on success.
+ *
+ *		**NULL** if not found or there was an error in adding
+ *		a new bpf_local_storage.
+ *
+ * int bpf_file_storage_delete(struct bpf_map *map, void *file)
+ *	Description
+ *		Delete a bpf_local_storage from a *file*.
+ *	Return
+ *		0 on success.
+ *
+ *		**-ENOENT** if the bpf_local_storage cannot be found.
  */
 #define __BPF_FUNC_MAPPER(FN)		\
 	FN(unspec),			\
@@ -5048,6 +5085,8 @@ union bpf_attr {
 	FN(timer_cancel),		\
 	FN(get_func_ip),		\
 	FN(get_attach_cookie),		\
+	FN(file_storage_get),		\
+	FN(file_storage_delete),	\
 	/* */
 
 /* integer value in 'imm' field of BPF_CALL instruction selects which helper
-- 
2.33.0