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bpf: net: Use precomputed btf_id for bpf iterators

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One additional field btf_id is added to struct
bpf_ctx_arg_aux to store the precomputed btf_ids.
The btf_id is computed at build time with
BTF_ID_LIST or BTF_ID_LIST_GLOBAL macro definitions.
All existing bpf iterators are changed to used
pre-compute btf_ids.

Signed-off-by: Yonghong Song <yhs@fb.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Link: https://lore.kernel.org/bpf/20200720163403.1393551-1-yhs@fb.com
This commit is contained in:
Yonghong Song
2020-07-20 09:34:03 -07:00
committed by Alexei Starovoitov
parent fce557bcef
commit 951cf368bc
8 changed files with 38 additions and 9 deletions
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12
kernel/bpf/task_iter.c
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@ -7,6 +7,7 @@
#include <linux/fs.h>
#include <linux/fdtable.h>
#include <linux/filter.h>
#include <linux/btf_ids.h>
struct bpf_iter_seq_task_common {
struct pid_namespace *ns;
@ -312,7 +313,11 @@ static const struct seq_operations task_file_seq_ops = {
.show = task_file_seq_show,
};
static const struct bpf_iter_reg task_reg_info = {
BTF_ID_LIST(btf_task_file_ids)
BTF_ID(struct, task_struct)
BTF_ID(struct, file)
static struct bpf_iter_reg task_reg_info = {
.target = "task",
.seq_ops = &task_seq_ops,
.init_seq_private = init_seq_pidns,
@ -325,7 +330,7 @@ static const struct bpf_iter_reg task_reg_info = {
},
};
static const struct bpf_iter_reg task_file_reg_info = {
static struct bpf_iter_reg task_file_reg_info = {
.target = "task_file",
.seq_ops = &task_file_seq_ops,
.init_seq_private = init_seq_pidns,
@ -344,10 +349,13 @@ static int __init task_iter_init(void)
{
int ret;
task_reg_info.ctx_arg_info[0].btf_id = btf_task_file_ids[0];
ret = bpf_iter_reg_target(&task_reg_info);
if (ret)
return ret;
task_file_reg_info.ctx_arg_info[0].btf_id = btf_task_file_ids[0];
task_file_reg_info.ctx_arg_info[1].btf_id = btf_task_file_ids[1];
return bpf_iter_reg_target(&task_file_reg_info);
}
late_initcall(task_iter_init);