From patchwork Thu Apr 21 14:07:34 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Benjamin Tissoires X-Patchwork-Id: 12821676 X-Patchwork-Delegate: bpf@iogearbox.net 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 05A15C43217 for ; Thu, 21 Apr 2022 14:07:57 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1388868AbiDUOKo (ORCPT ); Thu, 21 Apr 2022 10:10:44 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:46442 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1388847AbiDUOKn (ORCPT ); Thu, 21 Apr 2022 10:10:43 -0400 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.129.124]) by lindbergh.monkeyblade.net (Postfix) with ESMTP id 3E289262A for ; Thu, 21 Apr 2022 07:07:54 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1650550073; 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=mu71EcrM6CS//34lSShcmIEpi6ln3dKHHiAx5OAiSvg=; b=XRG8eAJZ7eYW/fZxS8WS06fLrPeTUrO7Wa95VAyJFN9aa40JrGNnTYjgA/EDFkzO7HE2PB L7NxPQExcY6GtxQvIdXBHl5lcPNGKln1QGZTFsxoiime4eoyo6VaOD6U1N1ZPJl41LaJS8 oYSja5EzVjLnpWlwrfUxfdrZbI0JXK8= 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-215-mfu0MqcAOoaEIsbQDeRINw-1; Thu, 21 Apr 2022 10:07:48 -0400 X-MC-Unique: mfu0MqcAOoaEIsbQDeRINw-1 Received: from smtp.corp.redhat.com (int-mx02.intmail.prod.int.rdu2.redhat.com [10.11.54.2]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id 1786985A5BE; Thu, 21 Apr 2022 14:07:48 +0000 (UTC) Received: from plouf.redhat.com (unknown [10.39.194.205]) by smtp.corp.redhat.com (Postfix) with ESMTP id 013EF40EC002; Thu, 21 Apr 2022 14:07:45 +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 Cc: Tero Kristo , linux-kernel@vger.kernel.org, linux-input@vger.kernel.org, bpf@vger.kernel.org, Benjamin Tissoires Subject: [RFC bpf-next v4 1/7] bpf/btf: also allow kfunc in tracing programs Date: Thu, 21 Apr 2022 16:07:34 +0200 Message-Id: <20220421140740.459558-2-benjamin.tissoires@redhat.com> In-Reply-To: <20220421140740.459558-1-benjamin.tissoires@redhat.com> References: <20220421140740.459558-1-benjamin.tissoires@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.84 on 10.11.54.2 Precedence: bulk List-ID: X-Mailing-List: bpf@vger.kernel.org X-Patchwork-Delegate: bpf@iogearbox.net X-Patchwork-State: RFC 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 --- 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; }