netdev - [PATCH bpf-next v1 13/15] libbpf: Add __kptr* macros to bpf

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Date:   Sun, 20 Feb 2022 19:18:11 +0530
From:   Kumar Kartikeya Dwivedi <memxor@...il.com>
To:     bpf@...r.kernel.org
Cc:     Alexei Starovoitov <ast@...nel.org>,
        Andrii Nakryiko <andrii@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Toke Høiland-Jørgensen <toke@...hat.com>,
        Jesper Dangaard Brouer <hawk@...nel.org>,
        netfilter-devel@...r.kernel.org, netdev@...r.kernel.org
Subject: [PATCH bpf-next v1 13/15] libbpf: Add __kptr* macros to bpf_helpers.h

Include convenience definitions:
__kptr:		Unreferenced BTF ID pointer
__kptr_ref:	Referenced BTF ID pointer
__kptr_percpu:	per-CPU BTF ID pointer
__kptr_user:	Userspace BTF ID pointer

Users can use them to tag the pointer type meant to be used with the new
support directly in the map value definition. Note that these attributes
require https://reviews.llvm.org/D119799 to be emitted in BPF object
BTF correctly when applied to a non-builtin type.

Signed-off-by: Kumar Kartikeya Dwivedi <memxor@...il.com>
---
 tools/lib/bpf/bpf_helpers.h | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/tools/lib/bpf/bpf_helpers.h b/tools/lib/bpf/bpf_helpers.h
index 44df982d2a5c..feb311fe1c72 100644
--- a/tools/lib/bpf/bpf_helpers.h
+++ b/tools/lib/bpf/bpf_helpers.h
@@ -149,6 +149,10 @@ enum libbpf_tristate {
 
 #define __kconfig __attribute__((section(".kconfig")))
 #define __ksym __attribute__((section(".ksyms")))
+#define __kptr __attribute__((btf_type_tag("kernel.bpf.btf_id")))
+#define __kptr_ref __kptr __attribute__((btf_type_tag("kernel.bpf.ref")))
+#define __kptr_percpu __kptr __attribute__((btf_type_tag("kernel.bpf.percpu")))
+#define __kptr_user __kptr __attribute__((btf_type_tag("kernel.bpf.user")))
 
 #ifndef ___bpf_concat
 #define ___bpf_concat(a, b) a ## b
-- 
2.35.1