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14fc6bd6b7
There is no functionality change for this patch. Struct bpf_iter_reg is used to register a bpf_iter target, which includes information for both prog_load, link_create and seq_file creation. This patch puts fields related seq_file creation into a different structure. This will be useful for map elements iterator where one iterator covers different map types and different map types may have different seq_ops, init/fini private_data function and private_data size. Signed-off-by: Yonghong Song <yhs@fb.com> Signed-off-by: Alexei Starovoitov <ast@kernel.org> Link: https://lore.kernel.org/bpf/20200723184109.590030-1-yhs@fb.com
108 lines
2.4 KiB
C
108 lines
2.4 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/* Copyright (c) 2020 Facebook */
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#include <linux/bpf.h>
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#include <linux/fs.h>
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#include <linux/filter.h>
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#include <linux/kernel.h>
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#include <linux/btf_ids.h>
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struct bpf_iter_seq_prog_info {
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u32 prog_id;
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};
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static void *bpf_prog_seq_start(struct seq_file *seq, loff_t *pos)
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{
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struct bpf_iter_seq_prog_info *info = seq->private;
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struct bpf_prog *prog;
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prog = bpf_prog_get_curr_or_next(&info->prog_id);
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if (!prog)
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return NULL;
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if (*pos == 0)
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++*pos;
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return prog;
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}
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static void *bpf_prog_seq_next(struct seq_file *seq, void *v, loff_t *pos)
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{
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struct bpf_iter_seq_prog_info *info = seq->private;
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++*pos;
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++info->prog_id;
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bpf_prog_put((struct bpf_prog *)v);
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return bpf_prog_get_curr_or_next(&info->prog_id);
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}
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struct bpf_iter__bpf_prog {
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__bpf_md_ptr(struct bpf_iter_meta *, meta);
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__bpf_md_ptr(struct bpf_prog *, prog);
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};
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DEFINE_BPF_ITER_FUNC(bpf_prog, struct bpf_iter_meta *meta, struct bpf_prog *prog)
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static int __bpf_prog_seq_show(struct seq_file *seq, void *v, bool in_stop)
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{
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struct bpf_iter__bpf_prog ctx;
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struct bpf_iter_meta meta;
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struct bpf_prog *prog;
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int ret = 0;
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ctx.meta = &meta;
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ctx.prog = v;
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meta.seq = seq;
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prog = bpf_iter_get_info(&meta, in_stop);
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if (prog)
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ret = bpf_iter_run_prog(prog, &ctx);
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return ret;
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}
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static int bpf_prog_seq_show(struct seq_file *seq, void *v)
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{
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return __bpf_prog_seq_show(seq, v, false);
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}
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static void bpf_prog_seq_stop(struct seq_file *seq, void *v)
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{
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if (!v)
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(void)__bpf_prog_seq_show(seq, v, true);
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else
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bpf_prog_put((struct bpf_prog *)v);
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}
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static const struct seq_operations bpf_prog_seq_ops = {
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.start = bpf_prog_seq_start,
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.next = bpf_prog_seq_next,
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.stop = bpf_prog_seq_stop,
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.show = bpf_prog_seq_show,
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};
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BTF_ID_LIST(btf_bpf_prog_id)
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BTF_ID(struct, bpf_prog)
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static const struct bpf_iter_seq_info bpf_prog_seq_info = {
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.seq_ops = &bpf_prog_seq_ops,
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.init_seq_private = NULL,
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.fini_seq_private = NULL,
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.seq_priv_size = sizeof(struct bpf_iter_seq_prog_info),
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};
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static struct bpf_iter_reg bpf_prog_reg_info = {
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.target = "bpf_prog",
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.ctx_arg_info_size = 1,
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.ctx_arg_info = {
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{ offsetof(struct bpf_iter__bpf_prog, prog),
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PTR_TO_BTF_ID_OR_NULL },
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},
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.seq_info = &bpf_prog_seq_info,
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};
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static int __init bpf_prog_iter_init(void)
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{
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bpf_prog_reg_info.ctx_arg_info[0].btf_id = *btf_bpf_prog_id;
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return bpf_iter_reg_target(&bpf_prog_reg_info);
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}
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late_initcall(bpf_prog_iter_init);
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