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bpf: Make the bpf_prog_array_map more generic

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All the map backends are of generic nature. In order to avoid
adding much special code into the eBPF core, rewrite part of
the bpf_prog_array map code and make it more generic. So the
new perf_event_array map type can reuse most of code with
bpf_prog_array map and add fewer lines of special code.

Signed-off-by: Wang Nan <wangnan0@huawei.com>
Signed-off-by: Kaixu Xia <xiakaixu@huawei.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Wang Nan 2015-08-06 07:02:33 +00:00 • committed by David S. Miller
parent ffe8690c85
commit 2a36f0b92e
5 changed files with 60 additions and 38 deletions
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8
include/linux/bpf.h
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@ -24,6 +24,10 @@ struct bpf_map_ops {
void *(*map_lookup_elem)(struct bpf_map *map, void *key);
int (*map_update_elem)(struct bpf_map *map, void *key, void *value, u64 flags);
int (*map_delete_elem)(struct bpf_map *map, void *key);
/* funcs called by prog_array and perf_event_array map */
void *(*map_fd_get_ptr) (struct bpf_map *map, int fd);
void (*map_fd_put_ptr) (void *ptr);
};
struct bpf_map {
@ -142,13 +146,13 @@ struct bpf_array {
bool owner_jited;
union {
char value[0] __aligned(8);
struct bpf_prog *prog[0] __aligned(8);
void *ptrs[0] __aligned(8);
};
};
#define MAX_TAIL_CALL_CNT 32
u64 bpf_tail_call(u64 ctx, u64 r2, u64 index, u64 r4, u64 r5);
void bpf_prog_array_map_clear(struct bpf_map *map);
void bpf_fd_array_map_clear(struct bpf_map *map);
bool bpf_prog_array_compatible(struct bpf_array *array, const struct bpf_prog *fp);
const struct bpf_func_proto *bpf_get_trace_printk_proto(void);