From patchwork Wed May 18 20:59:08 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Benjamin Tissoires X-Patchwork-Id: 12854117 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 2D5D9C4321E for ; Wed, 18 May 2022 20:59:51 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S242872AbiERU7u (ORCPT ); Wed, 18 May 2022 16:59:50 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:55338 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S242848AbiERU7l (ORCPT ); Wed, 18 May 2022 16:59:41 -0400 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.133.124]) by lindbergh.monkeyblade.net (Postfix) with ESMTP id D944C227045 for ; Wed, 18 May 2022 13:59:40 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1652907579; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=tG6J7OXecG2aHQWxhTipqfUbGWLrMU/iiBvmaxNqXfU=; b=MAYCBS31Fj8Ctv77kuIc2QkoLc7PHc1YIFpHkLmXkwgRWHrUTb23mKuUvUJ5ZpKqMcdl5E KV9Oke7hEakBXj0zWeOOe9t1rX9aRaiPzhXD7kiKeTQOT/1UCea5/CaR7ELg65GLlMvQwl V+95tmrzC+8VtWeyClygN+PswZgrBD8= Received: from mimecast-mx02.redhat.com (mimecast-mx02.redhat.com [66.187.233.88]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id us-mta-650-40hpmLLpPA-9qBBY7Stp_g-1; Wed, 18 May 2022 16:59:35 -0400 X-MC-Unique: 40hpmLLpPA-9qBBY7Stp_g-1 Received: from smtp.corp.redhat.com (int-mx06.intmail.prod.int.rdu2.redhat.com [10.11.54.6]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id D9A27101AA44; Wed, 18 May 2022 20:59:34 +0000 (UTC) Received: from plouf.redhat.com (unknown [10.39.192.58]) by smtp.corp.redhat.com (Postfix) with ESMTP id 633502166B25; Wed, 18 May 2022 20:59:31 +0000 (UTC) From: Benjamin Tissoires To: Greg KH , Jiri Kosina , Alexei Starovoitov , Daniel Borkmann , Andrii Nakryiko , Martin KaFai Lau , Song Liu , Yonghong Song , John Fastabend , KP Singh , Shuah Khan , Dave Marchevsky , Joe Stringer , Jonathan Corbet Cc: Tero Kristo , linux-kernel@vger.kernel.org, linux-input@vger.kernel.org, netdev@vger.kernel.org, bpf@vger.kernel.org, linux-kselftest@vger.kernel.org, linux-doc@vger.kernel.org, Benjamin Tissoires Subject: [PATCH bpf-next v5 01/17] bpf/btf: also allow kfunc in tracing and syscall programs Date: Wed, 18 May 2022 22:59:08 +0200 Message-Id: <20220518205924.399291-2-benjamin.tissoires@redhat.com> In-Reply-To: <20220518205924.399291-1-benjamin.tissoires@redhat.com> References: <20220518205924.399291-1-benjamin.tissoires@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.78 on 10.11.54.6 Precedence: bulk List-ID: X-Mailing-List: linux-kselftest@vger.kernel.org Tracing and syscall BPF program types are very convenient to add BPF capabilities to subsystem otherwise not BPF capable. When we add kfuncs capabilities to those program types, we can add BPF features to subsystems without having to touch BPF core. Signed-off-by: Benjamin Tissoires --- changes in v5: - also add syscalls 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 | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/kernel/bpf/btf.c b/kernel/bpf/btf.c index 2f0b0440131c..7bccaa4646e5 100644 --- a/kernel/bpf/btf.c +++ b/kernel/bpf/btf.c @@ -202,6 +202,8 @@ enum btf_kfunc_hook { BTF_KFUNC_HOOK_XDP, BTF_KFUNC_HOOK_TC, BTF_KFUNC_HOOK_STRUCT_OPS, + BTF_KFUNC_HOOK_TRACING, + BTF_KFUNC_HOOK_SYSCALL, BTF_KFUNC_HOOK_MAX, }; @@ -7110,6 +7112,10 @@ 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; + case BPF_PROG_TYPE_SYSCALL: + return BTF_KFUNC_HOOK_SYSCALL; default: return BTF_KFUNC_HOOK_MAX; }