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bpf: remove struct bpf_prog_type_list

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There's no need to have struct bpf_prog_type_list since
it just contains a list_head, the type, and the ops
pointer. Since the types are densely packed and not
actually dynamically registered, it's much easier and
smaller to have an array of type->ops pointer. Also
initialize this array statically to remove code needed
to initialize it.

In order to save duplicating the list, move it to a new
header file and include it in the places needing it.

Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Acked-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Alexei Starovoitov <ast@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Johannes Berg
2017-04-11 15:34:57 +02:00
committed by David S. Miller
parent 98601e8bc6
commit be9370a7d8
5 changed files with 44 additions and 122 deletions
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27
kernel/bpf/syscall.c
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@@ -573,26 +573,21 @@ err_put:
return err;
}
static LIST_HEAD(bpf_prog_types);
static const struct bpf_verifier_ops * const bpf_prog_types[] = {
#define BPF_PROG_TYPE(_id, _ops) \
[_id] = &_ops,
#include <linux/bpf_types.h>
#undef BPF_PROG_TYPE
};
static int find_prog_type(enum bpf_prog_type type, struct bpf_prog *prog)
{
struct bpf_prog_type_list *tl;
if (type >= ARRAY_SIZE(bpf_prog_types) || !bpf_prog_types[type])
return -EINVAL;
list_for_each_entry(tl, &bpf_prog_types, list_node) {
if (tl->type == type) {
prog->aux->ops = tl->ops;
prog->type = type;
return 0;
}
}
return -EINVAL;
}
void bpf_register_prog_type(struct bpf_prog_type_list *tl)
{
list_add(&tl->list_node, &bpf_prog_types);
prog->aux->ops = bpf_prog_types[type];
prog->type = type;
return 0;
}
/* drop refcnt on maps used by eBPF program and free auxilary data */