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bpf: Optimize the performance of find_bpffs_btf_enums

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Currently, vmlinux BTF is unconditionally sorted during
the build phase. The function btf_find_by_name_kind
executes the binary search branch, so find_bpffs_btf_enums
can be optimized by using btf_find_by_name_kind.

Signed-off-by: Donglin Peng <pengdonglin@xiaomi.com>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Acked-by: Eduard Zingerman <eddyz87@gmail.com>
Link: https://lore.kernel.org/bpf/20260109130003.3313716-10-dolinux.peng@gmail.com
This commit is contained in:
Donglin Peng 2026-01-09 21:00:01 +08:00 committed by Andrii Nakryiko
parent dc893cfa39
commit 434bcbc837
1 changed files with 17 additions and 25 deletions
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42
kernel/bpf/inode.c
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@ -600,10 +600,17 @@ struct bpffs_btf_enums {
static int find_bpffs_btf_enums(struct bpffs_btf_enums *info)
{
struct {
const struct btf_type **type;
const char *name;
} btf_enums[] = {
{&info->cmd_t, "bpf_cmd"},
{&info->map_t, "bpf_map_type"},
{&info->prog_t, "bpf_prog_type"},
{&info->attach_t, "bpf_attach_type"},
};
const struct btf *btf;
const struct btf_type *t;
const char *name;
int i, n;
int i, id;
memset(info, 0, sizeof(*info));
@ -615,31 +622,16 @@ static int find_bpffs_btf_enums(struct bpffs_btf_enums *info)
info->btf = btf;
for (i = 1, n = btf_nr_types(btf); i < n; i++) {
t = btf_type_by_id(btf, i);
if (!btf_type_is_enum(t))
continue;
for (i = 0; i < ARRAY_SIZE(btf_enums); i++) {
id = btf_find_by_name_kind(btf, btf_enums[i].name,
BTF_KIND_ENUM);
if (id < 0)
return -ESRCH;
name = btf_name_by_offset(btf, t->name_off);
if (!name)
continue;
if (strcmp(name, "bpf_cmd") == 0)
info->cmd_t = t;
else if (strcmp(name, "bpf_map_type") == 0)
info->map_t = t;
else if (strcmp(name, "bpf_prog_type") == 0)
info->prog_t = t;
else if (strcmp(name, "bpf_attach_type") == 0)
info->attach_t = t;
else
continue;
if (info->cmd_t && info->map_t && info->prog_t && info->attach_t)
return 0;
*btf_enums[i].type = btf_type_by_id(btf, id);
}
return -ESRCH;
return 0;
}
static bool find_btf_enum_const(const struct btf *btf, const struct btf_type *enum_t,