mirror of
https://github.com/edk2-porting/linux-next.git
synced 2025-01-11 07:04:04 +08:00
60197cfb6e
This patch adds BPF_OBJ_GET_INFO_BY_FD support to BTF fd. The original BTF data, which was used to create the BTF fd during the earlier BPF_BTF_LOAD call, will be returned. The userspace is expected to allocate buffer to info.info and the buffer size is set to info.info_len before calling BPF_OBJ_GET_INFO_BY_FD. The original BTF data is copied to the userspace buffer (info.info). Only upto the user's specified info.info_len will be copied. The original BTF data size is set to info.info_len. The userspace needs to check if it is bigger than its allocated buffer size. If it is, the userspace should realloc with the kernel-returned info.info_len and call the BPF_OBJ_GET_INFO_BY_FD again. Signed-off-by: Martin KaFai Lau <kafai@fb.com> Acked-by: Alexei Starovoitov <ast@fb.com> Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
49 lines
1.6 KiB
C
49 lines
1.6 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
|
|
/* Copyright (c) 2018 Facebook */
|
|
|
|
#ifndef _LINUX_BTF_H
|
|
#define _LINUX_BTF_H 1
|
|
|
|
#include <linux/types.h>
|
|
|
|
struct btf;
|
|
struct btf_type;
|
|
union bpf_attr;
|
|
|
|
extern const struct file_operations btf_fops;
|
|
|
|
void btf_put(struct btf *btf);
|
|
int btf_new_fd(const union bpf_attr *attr);
|
|
struct btf *btf_get_by_fd(int fd);
|
|
int btf_get_info_by_fd(const struct btf *btf,
|
|
const union bpf_attr *attr,
|
|
union bpf_attr __user *uattr);
|
|
/* Figure out the size of a type_id. If type_id is a modifier
|
|
* (e.g. const), it will be resolved to find out the type with size.
|
|
*
|
|
* For example:
|
|
* In describing "const void *", type_id is "const" and "const"
|
|
* refers to "void *". The return type will be "void *".
|
|
*
|
|
* If type_id is a simple "int", then return type will be "int".
|
|
*
|
|
* @btf: struct btf object
|
|
* @type_id: Find out the size of type_id. The type_id of the return
|
|
* type is set to *type_id.
|
|
* @ret_size: It can be NULL. If not NULL, the size of the return
|
|
* type is set to *ret_size.
|
|
* Return: The btf_type (resolved to another type with size info if needed).
|
|
* NULL is returned if type_id itself does not have size info
|
|
* (e.g. void) or it cannot be resolved to another type that
|
|
* has size info.
|
|
* *type_id and *ret_size will not be changed in the
|
|
* NULL return case.
|
|
*/
|
|
const struct btf_type *btf_type_id_size(const struct btf *btf,
|
|
u32 *type_id,
|
|
u32 *ret_size);
|
|
void btf_type_seq_show(const struct btf *btf, u32 type_id, void *obj,
|
|
struct seq_file *m);
|
|
|
|
#endif
|