mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-10-30 08:02:30 +00:00
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
107 lines
2.4 KiB
C
107 lines
2.4 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
|
|
/* Copyright (c) 2020 Facebook */
|
|
#include <linux/bpf.h>
|
|
#include <linux/fs.h>
|
|
#include <linux/filter.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/btf_ids.h>
|
|
|
|
struct bpf_iter_seq_prog_info {
|
|
u32 prog_id;
|
|
};
|
|
|
|
static void *bpf_prog_seq_start(struct seq_file *seq, loff_t *pos)
|
|
{
|
|
struct bpf_iter_seq_prog_info *info = seq->private;
|
|
struct bpf_prog *prog;
|
|
|
|
prog = bpf_prog_get_curr_or_next(&info->prog_id);
|
|
if (!prog)
|
|
return NULL;
|
|
|
|
if (*pos == 0)
|
|
++*pos;
|
|
return prog;
|
|
}
|
|
|
|
static void *bpf_prog_seq_next(struct seq_file *seq, void *v, loff_t *pos)
|
|
{
|
|
struct bpf_iter_seq_prog_info *info = seq->private;
|
|
|
|
++*pos;
|
|
++info->prog_id;
|
|
bpf_prog_put((struct bpf_prog *)v);
|
|
return bpf_prog_get_curr_or_next(&info->prog_id);
|
|
}
|
|
|
|
struct bpf_iter__bpf_prog {
|
|
__bpf_md_ptr(struct bpf_iter_meta *, meta);
|
|
__bpf_md_ptr(struct bpf_prog *, prog);
|
|
};
|
|
|
|
DEFINE_BPF_ITER_FUNC(bpf_prog, struct bpf_iter_meta *meta, struct bpf_prog *prog)
|
|
|
|
static int __bpf_prog_seq_show(struct seq_file *seq, void *v, bool in_stop)
|
|
{
|
|
struct bpf_iter__bpf_prog ctx;
|
|
struct bpf_iter_meta meta;
|
|
struct bpf_prog *prog;
|
|
int ret = 0;
|
|
|
|
ctx.meta = &meta;
|
|
ctx.prog = v;
|
|
meta.seq = seq;
|
|
prog = bpf_iter_get_info(&meta, in_stop);
|
|
if (prog)
|
|
ret = bpf_iter_run_prog(prog, &ctx);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int bpf_prog_seq_show(struct seq_file *seq, void *v)
|
|
{
|
|
return __bpf_prog_seq_show(seq, v, false);
|
|
}
|
|
|
|
static void bpf_prog_seq_stop(struct seq_file *seq, void *v)
|
|
{
|
|
if (!v)
|
|
(void)__bpf_prog_seq_show(seq, v, true);
|
|
else
|
|
bpf_prog_put((struct bpf_prog *)v);
|
|
}
|
|
|
|
static const struct seq_operations bpf_prog_seq_ops = {
|
|
.start = bpf_prog_seq_start,
|
|
.next = bpf_prog_seq_next,
|
|
.stop = bpf_prog_seq_stop,
|
|
.show = bpf_prog_seq_show,
|
|
};
|
|
|
|
BTF_ID_LIST(btf_bpf_prog_id)
|
|
BTF_ID(struct, bpf_prog)
|
|
|
|
static const struct bpf_iter_seq_info bpf_prog_seq_info = {
|
|
.seq_ops = &bpf_prog_seq_ops,
|
|
.init_seq_private = NULL,
|
|
.fini_seq_private = NULL,
|
|
.seq_priv_size = sizeof(struct bpf_iter_seq_prog_info),
|
|
};
|
|
|
|
static struct bpf_iter_reg bpf_prog_reg_info = {
|
|
.target = "bpf_prog",
|
|
.ctx_arg_info_size = 1,
|
|
.ctx_arg_info = {
|
|
{ offsetof(struct bpf_iter__bpf_prog, prog),
|
|
PTR_TO_BTF_ID_OR_NULL },
|
|
},
|
|
.seq_info = &bpf_prog_seq_info,
|
|
};
|
|
|
|
static int __init bpf_prog_iter_init(void)
|
|
{
|
|
bpf_prog_reg_info.ctx_arg_info[0].btf_id = *btf_bpf_prog_id;
|
|
return bpf_iter_reg_target(&bpf_prog_reg_info);
|
|
}
|
|
|
|
late_initcall(bpf_prog_iter_init);
|