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bpf: add percpu stats for bpf_map elements insertions/deletions 

Add a generic percpu stats for bpf_map elements insertions/deletions in order
to keep track of both, the current (approximate) number of elements in a map
and per-cpu statistics on update/delete operations.

To expose these stats a particular map implementation should initialize the
counter and adjust it as needed using the 'bpf_map_*_elem_count' helpers
provided by this commit.

Signed-off-by: Anton Protopopov <aspsk@isovalent.com>
Link: https://lore.kernel.org/r/20230706133932.45883-2-aspsk@isovalent.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
This commit is contained in:
Anton Protopopov 2023-07-06 13:39:28 +00:00 committed by Alexei Starovoitov
parent fd283ab196
commit 2595473046
1 changed files with 30 additions and 0 deletions
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30
include/linux/bpf.h
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@ -275,6 +275,7 @@ struct bpf_map {
} owner;
bool bypass_spec_v1;
bool frozen; /* write-once; write-protected by freeze_mutex */
s64 __percpu *elem_count;
};
static inline const char *btf_field_type_name(enum btf_field_type type)
@ -2040,6 +2041,35 @@ bpf_map_alloc_percpu(const struct bpf_map *map, size_t size, size_t align,
}
#endif
static inline int
bpf_map_init_elem_count(struct bpf_map *map)
{
size_t size = sizeof(*map->elem_count), align = size;
gfp_t flags = GFP_USER | __GFP_NOWARN;
map->elem_count = bpf_map_alloc_percpu(map, size, align, flags);
if (!map->elem_count)
return -ENOMEM;
return 0;
}
static inline void
bpf_map_free_elem_count(struct bpf_map *map)
{
free_percpu(map->elem_count);
}
static inline void bpf_map_inc_elem_count(struct bpf_map *map)
{
this_cpu_inc(*map->elem_count);
}
static inline void bpf_map_dec_elem_count(struct bpf_map *map)
{
this_cpu_dec(*map->elem_count);
}
extern int sysctl_unprivileged_bpf_disabled;
static inline bool bpf_allow_ptr_leaks(void)