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78c1f8d063
Reduce bpf_core_apply_relo_insn() stack usage and bump
BPF_CORE_SPEC_MAX_LEN limit back to 64.
Fixes: 29db4bea1d ("bpf: Prepare relo_core.c for kernel duty.")
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/bpf/20211203182836.16646-1-alexei.starovoitov@gmail.com
58 lines
1.6 KiB
C
58 lines
1.6 KiB
C
/* SPDX-License-Identifier: (LGPL-2.1 OR BSD-2-Clause) */
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/* Copyright (c) 2019 Facebook */
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#ifndef __RELO_CORE_H
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#define __RELO_CORE_H
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#include <linux/bpf.h>
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struct bpf_core_cand {
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const struct btf *btf;
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__u32 id;
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};
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/* dynamically sized list of type IDs and its associated struct btf */
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struct bpf_core_cand_list {
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struct bpf_core_cand *cands;
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int len;
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};
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#define BPF_CORE_SPEC_MAX_LEN 64
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/* represents BPF CO-RE field or array element accessor */
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struct bpf_core_accessor {
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__u32 type_id; /* struct/union type or array element type */
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__u32 idx; /* field index or array index */
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const char *name; /* field name or NULL for array accessor */
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};
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struct bpf_core_spec {
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const struct btf *btf;
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/* high-level spec: named fields and array indices only */
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struct bpf_core_accessor spec[BPF_CORE_SPEC_MAX_LEN];
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/* original unresolved (no skip_mods_or_typedefs) root type ID */
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__u32 root_type_id;
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/* CO-RE relocation kind */
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enum bpf_core_relo_kind relo_kind;
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/* high-level spec length */
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int len;
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/* raw, low-level spec: 1-to-1 with accessor spec string */
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int raw_spec[BPF_CORE_SPEC_MAX_LEN];
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/* raw spec length */
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int raw_len;
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/* field bit offset represented by spec */
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__u32 bit_offset;
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};
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int bpf_core_apply_relo_insn(const char *prog_name,
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struct bpf_insn *insn, int insn_idx,
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const struct bpf_core_relo *relo, int relo_idx,
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const struct btf *local_btf,
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struct bpf_core_cand_list *cands,
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struct bpf_core_spec *specs_scratch);
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int bpf_core_types_are_compat(const struct btf *local_btf, __u32 local_id,
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const struct btf *targ_btf, __u32 targ_id);
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size_t bpf_core_essential_name_len(const char *name);
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#endif
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