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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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7
net/netlink/af_netlink.c
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@@ -60,6 +60,7 @@
#include <linux/genetlink.h>
#include <linux/net_namespace.h>
#include <linux/nospec.h>
#include <linux/btf_ids.h>
#include <net/net_namespace.h>
#include <net/netns/generic.h>
@@ -2803,7 +2804,10 @@ static const struct rhashtable_params netlink_rhashtable_params = {
};
#if defined(CONFIG_BPF_SYSCALL) && defined(CONFIG_PROC_FS)
static const struct bpf_iter_reg netlink_reg_info = {
BTF_ID_LIST(btf_netlink_sock_id)
BTF_ID(struct, netlink_sock)
static struct bpf_iter_reg netlink_reg_info = {
.target = "netlink",
.seq_ops = &netlink_seq_ops,
.init_seq_private = bpf_iter_init_seq_net,
@@ -2818,6 +2822,7 @@ static const struct bpf_iter_reg netlink_reg_info = {
static int __init bpf_iter_register(void)
{
netlink_reg_info.ctx_arg_info[0].btf_id = *btf_netlink_sock_id;
return bpf_iter_reg_target(&netlink_reg_info);
}
#endif