From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-0.8 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id A8C99C43331 for ; Thu, 26 Mar 2020 02:30:26 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 86BB12073E for ; Thu, 26 Mar 2020 02:30:26 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727576AbgCZCaV (ORCPT ); Wed, 25 Mar 2020 22:30:21 -0400 Received: from shards.monkeyblade.net ([23.128.96.9]:50558 "EHLO shards.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727560AbgCZCaV (ORCPT ); Wed, 25 Mar 2020 22:30:21 -0400 Received: from localhost (unknown [IPv6:2601:601:9f00:477::3d5]) (using TLSv1 with cipher AES256-SHA (256/256 bits)) (Client did not present a certificate) (Authenticated sender: davem-davemloft) by shards.monkeyblade.net (Postfix) with ESMTPSA id D98C815B2D569; Wed, 25 Mar 2020 19:30:19 -0700 (PDT) Date: Wed, 25 Mar 2020 19:30:16 -0700 (PDT) Message-Id: <20200325.193016.1654692564933635575.davem@davemloft.net> To: andrea.mayer@uniroma2.it Cc: kuznet@ms2.inr.ac.ru, yoshfuji@linux-ipv6.org, dav.lebrun@gmail.com, netdev@vger.kernel.org, linux-kernel@vger.kernel.org, leon@kernel.org, ast@kernel.org, daniel@iogearbox.net, kafai@fb.com, songliubraving@fb.com, yhs@fb.com, andriin@fb.com, bpf@vger.kernel.org, paolo.lungaroni@cnit.it, ahmed.abdelsalam@gssi.it Subject: Re: [net-next] seg6: add support for optional attributes during behavior construction From: David Miller In-Reply-To: <20200319183641.29608-1-andrea.mayer@uniroma2.it> References: <20200319183641.29608-1-andrea.mayer@uniroma2.it> X-Mailer: Mew version 6.8 on Emacs 26.1 Mime-Version: 1.0 Content-Type: Text/Plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Greylist: Sender succeeded SMTP AUTH, not delayed by milter-greylist-4.5.12 (shards.monkeyblade.net [149.20.54.216]); Wed, 25 Mar 2020 19:30:20 -0700 (PDT) Sender: bpf-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: bpf@vger.kernel.org From: Andrea Mayer Date: Thu, 19 Mar 2020 19:36:41 +0100 > Messy code and complicated tricks may arise from this approach. People taking advantage of this new flexibility will write applications that DO NOT WORK on older kernels. I think we are therefore stuck with the current optional attribute semantics, sorry.