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selftests/bpf: Ensure snprintf_btf/bpf_iter tests compatibility with old vmlinux.h 

Andrii reports that bpf selftests relying on "struct btf_ptr" and BTF_F_*
values will not build as vmlinux.h for older kernels will not include
"struct btf_ptr" or the BTF_F_* enum values.  Undefine and redefine
them to work around this.

Fixes: b72091bd4e ("selftests/bpf: Add test for bpf_seq_printf_btf helper")
Fixes: 076a95f5af ("selftests/bpf: Add bpf_snprintf_btf helper tests")
Reported-by: Andrii Nakryiko <andrii.nakryiko@gmail.com>
Signed-off-by: Alan Maguire <alan.maguire@oracle.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Acked-by: Andrii Nakryiko <andriin@fb.com>
Link: https://lore.kernel.org/bpf/1601379151-21449-3-git-send-email-alan.maguire@oracle.com
This commit is contained in:
Alan Maguire 2020-09-29 04:32:31 -07:00 committed by Alexei Starovoitov
parent 96c48058db
commit cfe77683b8
3 changed files with 51 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

23
tools/testing/selftests/bpf/progs/bpf_iter.h
View File

@ -14,6 +14,11 @@
#define bpf_iter__bpf_map_elem bpf_iter__bpf_map_elem___not_used
#define bpf_iter__bpf_sk_storage_map bpf_iter__bpf_sk_storage_map___not_used
#define bpf_iter__sockmap bpf_iter__sockmap___not_used
#define btf_ptr btf_ptr___not_used
#define BTF_F_COMPACT BTF_F_COMPACT___not_used
#define BTF_F_NONAME BTF_F_NONAME___not_used
#define BTF_F_PTR_RAW BTF_F_PTR_RAW___not_used
#define BTF_F_ZERO BTF_F_ZERO___not_used
#include "vmlinux.h"
#undef bpf_iter_meta
#undef bpf_iter__bpf_map
@ -28,6 +33,11 @@
#undef bpf_iter__bpf_map_elem
#undef bpf_iter__bpf_sk_storage_map
#undef bpf_iter__sockmap
#undef btf_ptr
#undef BTF_F_COMPACT
#undef BTF_F_NONAME
#undef BTF_F_PTR_RAW
#undef BTF_F_ZERO
struct bpf_iter_meta {
struct seq_file *seq;
@ -105,3 +115,16 @@ struct bpf_iter__sockmap {
void *key;
struct sock *sk;
};
struct btf_ptr {
void *ptr;
__u32 type_id;
__u32 flags;
};
enum {
BTF_F_COMPACT = (1ULL << 0),
BTF_F_NONAME = (1ULL << 1),
BTF_F_PTR_RAW = (1ULL << 2),
BTF_F_ZERO = (1ULL << 3),
};

27
tools/testing/selftests/bpf/progs/btf_ptr.h Normal file
View File

@ -0,0 +1,27 @@
/* SPDX-License-Identifier: GPL-2.0 */
/* Copyright (c) 2020, Oracle and/or its affiliates. */
/* "undefine" structs in vmlinux.h, because we "override" them below */
#define btf_ptr btf_ptr___not_used
#define BTF_F_COMPACT BTF_F_COMPACT___not_used
#define BTF_F_NONAME BTF_F_NONAME___not_used
#define BTF_F_PTR_RAW BTF_F_PTR_RAW___not_used
#define BTF_F_ZERO BTF_F_ZERO___not_used
#include "vmlinux.h"
#undef btf_ptr
#undef BTF_F_COMPACT
#undef BTF_F_NONAME
#undef BTF_F_PTR_RAW
#undef BTF_F_ZERO
struct btf_ptr {
void *ptr;
__u32 type_id;
__u32 flags;
};
enum {
BTF_F_COMPACT = (1ULL << 0),
BTF_F_NONAME = (1ULL << 1),
BTF_F_PTR_RAW = (1ULL << 2),
BTF_F_ZERO = (1ULL << 3),
};

2
tools/testing/selftests/bpf/progs/netif_receive_skb.c
View File

@ -1,7 +1,7 @@
// SPDX-License-Identifier: GPL-2.0
/* Copyright (c) 2020, Oracle and/or its affiliates. */
#include "vmlinux.h"
#include "btf_ptr.h"
#include <bpf/bpf_helpers.h>
#include <bpf/bpf_tracing.h>
#include <bpf/bpf_core_read.h>