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UPSTREAM: 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.

Change-Id: I1cb3532f3c31b426f279ed17e092e311649d54e1
Signed-off-by: Yonghong Song <[email protected]>
Signed-off-by: Alexei Starovoitov <[email protected]>
Link: https://lore.kernel.org/bpf/[email protected]
This commit is contained in:
Yonghong Song 2020-07-20 09:34:03 -07:00 • committed by basamaryan
commit 6be51943c7
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GPG key ID: 210D5384FB2A5885
8 changed files with 38 additions and 9 deletions
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7
net/ipv6/route.c
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@ -62,6 +62,7 @@
#include <net/l3mdev.h>
#include <net/ip.h>
#include <linux/uaccess.h>
#include <linux/btf_ids.h>
#ifdef CONFIG_SYSCTL
#include <linux/sysctl.h>
@ -6411,7 +6412,10 @@ void __init ip6_route_init_special_entries(void)
#if defined(CONFIG_BPF_SYSCALL) && defined(CONFIG_PROC_FS)
DEFINE_BPF_ITER_FUNC(ipv6_route, struct bpf_iter_meta *meta, struct fib6_info *rt)
static const struct bpf_iter_reg ipv6_route_reg_info = {
BTF_ID_LIST(btf_fib6_info_id)
BTF_ID(struct, fib6_info)
static struct bpf_iter_reg ipv6_route_reg_info = {
.target = "ipv6_route",
.seq_ops = &ipv6_route_seq_ops,
.init_seq_private = bpf_iter_init_seq_net,
@ -6426,6 +6430,7 @@ static const struct bpf_iter_reg ipv6_route_reg_info = {
static int __init bpf_iter_register(void)
{
ipv6_route_reg_info.ctx_arg_info[0].btf_id = *btf_fib6_info_id;
return bpf_iter_reg_target(&ipv6_route_reg_info);
}