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https://github.com/Fishwaldo/linux-bl808.git
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db20fd2b01
'maps' is a generic storage of different types for sharing data between kernel and userspace. The maps are accessed from user space via BPF syscall, which has commands: - create a map with given type and attributes fd = bpf(BPF_MAP_CREATE, union bpf_attr *attr, u32 size) returns fd or negative error - lookup key in a given map referenced by fd err = bpf(BPF_MAP_LOOKUP_ELEM, union bpf_attr *attr, u32 size) using attr->map_fd, attr->key, attr->value returns zero and stores found elem into value or negative error - create or update key/value pair in a given map err = bpf(BPF_MAP_UPDATE_ELEM, union bpf_attr *attr, u32 size) using attr->map_fd, attr->key, attr->value returns zero or negative error - find and delete element by key in a given map err = bpf(BPF_MAP_DELETE_ELEM, union bpf_attr *attr, u32 size) using attr->map_fd, attr->key - iterate map elements (based on input key return next_key) err = bpf(BPF_MAP_GET_NEXT_KEY, union bpf_attr *attr, u32 size) using attr->map_fd, attr->key, attr->next_key - close(fd) deletes the map Signed-off-by: Alexei Starovoitov <ast@plumgrid.com> Signed-off-by: David S. Miller <davem@davemloft.net>
49 lines
1.4 KiB
C
49 lines
1.4 KiB
C
/* Copyright (c) 2011-2014 PLUMgrid, http://plumgrid.com
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of version 2 of the GNU General Public
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* License as published by the Free Software Foundation.
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*/
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#ifndef _LINUX_BPF_H
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#define _LINUX_BPF_H 1
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#include <uapi/linux/bpf.h>
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#include <linux/workqueue.h>
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#include <linux/file.h>
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struct bpf_map;
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/* map is generic key/value storage optionally accesible by eBPF programs */
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struct bpf_map_ops {
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/* funcs callable from userspace (via syscall) */
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struct bpf_map *(*map_alloc)(union bpf_attr *attr);
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void (*map_free)(struct bpf_map *);
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int (*map_get_next_key)(struct bpf_map *map, void *key, void *next_key);
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/* funcs callable from userspace and from eBPF programs */
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void *(*map_lookup_elem)(struct bpf_map *map, void *key);
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int (*map_update_elem)(struct bpf_map *map, void *key, void *value);
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int (*map_delete_elem)(struct bpf_map *map, void *key);
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};
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struct bpf_map {
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atomic_t refcnt;
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enum bpf_map_type map_type;
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u32 key_size;
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u32 value_size;
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u32 max_entries;
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struct bpf_map_ops *ops;
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struct work_struct work;
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};
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struct bpf_map_type_list {
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struct list_head list_node;
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struct bpf_map_ops *ops;
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enum bpf_map_type type;
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};
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void bpf_register_map_type(struct bpf_map_type_list *tl);
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void bpf_map_put(struct bpf_map *map);
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struct bpf_map *bpf_map_get(struct fd f);
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#endif /* _LINUX_BPF_H */
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