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=-7.7 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,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 7A4A0C4743C for ; Tue, 22 Jun 2021 01:30:24 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 562AA61040 for ; Tue, 22 Jun 2021 01:30:24 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230268AbhFVBch (ORCPT ); Mon, 21 Jun 2021 21:32:37 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:38626 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230175AbhFVBcg (ORCPT ); Mon, 21 Jun 2021 21:32:36 -0400 Received: from mail-qk1-x733.google.com (mail-qk1-x733.google.com [IPv6:2607:f8b0:4864:20::733]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id AF6CCC061574; Mon, 21 Jun 2021 18:30:20 -0700 (PDT) Received: by mail-qk1-x733.google.com with SMTP id j184so35469742qkd.6; Mon, 21 Jun 2021 18:30:20 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=date:from:to:cc:subject:message-id:references:mime-version :content-disposition:in-reply-to; bh=P1T3GyRhBi7GEl+St9OfKiYv0CVkyOTJ8xac8/yyCss=; b=bBRP+3kP2Ehu+3mITOtC1wvmuxEXCHjzPiSWtEORsaMU8D62FrFZIO3wHfpTeQ7EwI 02FQhuDDlXrLeL2evsMEgPvr0FyYrglLdFmLdICN9AZknc1IeCQZcuzHxW+RB3T7CDni VlTGsQUH3vmD0Pfqi5EdI6FhrG6/26oy8zeXF1if4EBuTimUKUrEaza9o2M7mPV2Dx/v HTyuh+4Gb1RP1OhLVanbUs7AbA0jZIQGi5jLQ434Nw71W3EsCBcqI6RQ9KxMoRf1CJI+ FLw6jkdzdNHt9tVas8ier3xj7SI6VELjN0nkDA4AVh+UbTiPHlLwuaMrjp3N7DwALqUb eiLw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:date:from:to:cc:subject:message-id:references :mime-version:content-disposition:in-reply-to; bh=P1T3GyRhBi7GEl+St9OfKiYv0CVkyOTJ8xac8/yyCss=; b=Cy3UxVnlrOFeq67JFnoz6wg1erhrXjSQE+waXYaOOVXzGNxHi69FMyhnHuC3PRviik ZOkKN+U/MiLV6xs1tBMJWcWCLskGqo3guwEUccrlULXmQ4KCa7Mp57eksxd5pA2gf/Ay 4Lxx6qEUDwjrHKqlnmz52SRJ5/Ci93ejprlv9pGSQMk6OYj9UilAHTk3DhcN79/ebYnp zCgKNj9N41Lx+gFQYEDFMrdiSXS0WgPigaBx2yNWsRDPcHvrIbTQjOCsV86isoaiSCG/ 5EN9832HG0aLlJaw3dS8uosCBuboaojk7JEth7trn1ct4hzv6KEc90IRSPL9Oz6g6Raw dWMA== X-Gm-Message-State: AOAM530xDS+qxZbul0CiCkgg8CDJAP/quS0FXjr5K9tguWVjbNRWEY+S wD7oC9/ZZ8hhP/Yc2iiRdkBrbqv2A26OOg== X-Google-Smtp-Source: ABdhPJxJfQqBvL41zgDTkD4oinyAdQ1CkAuqtljnq8svjcKeSPzH4ett7D97XAPPmxzuCsDFo81Nmg== X-Received: by 2002:a05:620a:c8c:: with SMTP id q12mr1704602qki.203.1624325419845; Mon, 21 Jun 2021 18:30:19 -0700 (PDT) Received: from horizon.localdomain ([177.220.172.71]) by smtp.gmail.com with ESMTPSA id s133sm11326973qke.97.2021.06.21.18.30.19 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 21 Jun 2021 18:30:19 -0700 (PDT) Received: by horizon.localdomain (Postfix, from userid 1000) id 1BE63C02A9; Mon, 21 Jun 2021 22:30:17 -0300 (-03) Date: Mon, 21 Jun 2021 22:30:17 -0300 From: Marcelo Ricardo Leitner To: Xin Long Cc: network dev , davem@davemloft.net, kuba@kernel.org, linux-sctp@vger.kernel.org Subject: Re: [PATCH net-next 00/14] sctp: implement RFC8899: Packetization Layer Path MTU Discovery for SCTP transport Message-ID: References: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: Precedence: bulk List-ID: X-Mailing-List: linux-sctp@vger.kernel.org On Sun, Jun 20, 2021 at 09:38:35PM -0400, Xin Long wrote: > Overview(From RFC8899): > > In contrast to PMTUD, Packetization Layer Path MTU Discovery > (PLPMTUD) [RFC4821] introduces a method that does not rely upon > reception and validation of PTB messages. It is therefore more > robust than Classical PMTUD. This has become the recommended > approach for implementing discovery of the PMTU [BCP145]. > > It uses a general strategy in which the PL sends probe packets to > search for the largest size of unfragmented datagram that can be sent > over a network path. Probe packets are sent to explore using a > larger packet size. If a probe packet is successfully delivered (as > determined by the PL), then the PLPMTU is raised to the size of the > successful probe. If a black hole is detected (e.g., where packets > of size PLPMTU are consistently not received), the method reduces the > PLPMTU. Thanks Xin! Acked-by: Marcelo Ricardo Leitner