linux-kernel - [RFC bpf-next v4 1/7] bpf/btf: also allow kfunc in tracing programs

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Date:   Thu, 21 Apr 2022 16:07:34 +0200
From:   Benjamin Tissoires <benjamin.tissoires@...hat.com>
To:     Greg KH <gregkh@...uxfoundation.org>,
        Jiri Kosina <jikos@...nel.org>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Andrii Nakryiko <andrii@...nel.org>,
        Martin KaFai Lau <kafai@...com>,
        Song Liu <songliubraving@...com>, Yonghong Song <yhs@...com>,
        John Fastabend <john.fastabend@...il.com>,
        KP Singh <kpsingh@...nel.org>
Cc:     Tero Kristo <tero.kristo@...ux.intel.com>,
        linux-kernel@...r.kernel.org, linux-input@...r.kernel.org,
        bpf@...r.kernel.org,
        Benjamin Tissoires <benjamin.tissoires@...hat.com>
Subject: [RFC bpf-next v4 1/7] bpf/btf: also allow kfunc in tracing programs

using fentry/fexit and fmod_ret is very convenient to access
module BPF capabilities, so be able to define kfuncs there is
a must.

Signed-off-by: Benjamin Tissoires <benjamin.tissoires@...hat.com>

---

new in v4:
- I think this is where I need to add my new kfuncs, though
  in the end I need to be able to change the incoming data, so
  maybe only fmod_ret is the one we need to be able to be RW.
---
 kernel/bpf/btf.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/kernel/bpf/btf.c b/kernel/bpf/btf.c
index 0493310d981f..76318a4c2d0e 100644
--- a/kernel/bpf/btf.c
+++ b/kernel/bpf/btf.c
@@ -202,6 +202,7 @@ enum btf_kfunc_hook {
 	BTF_KFUNC_HOOK_XDP,
 	BTF_KFUNC_HOOK_TC,
 	BTF_KFUNC_HOOK_STRUCT_OPS,
+	BTF_KFUNC_HOOK_TRACING,
 	BTF_KFUNC_HOOK_MAX,
 };
 
@@ -6892,6 +6893,8 @@ static int bpf_prog_type_to_kfunc_hook(enum bpf_prog_type prog_type)
 		return BTF_KFUNC_HOOK_TC;
 	case BPF_PROG_TYPE_STRUCT_OPS:
 		return BTF_KFUNC_HOOK_STRUCT_OPS;
+	case BPF_PROG_TYPE_TRACING:
+		return BTF_KFUNC_HOOK_TRACING;
 	default:
 		return BTF_KFUNC_HOOK_MAX;
 	}
-- 
2.35.1