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=-4.0 required=3.0 tests=BAYES_00, 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 5784CC433E1 for ; Fri, 14 Aug 2020 10:50:29 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 3AD2820708 for ; Fri, 14 Aug 2020 10:50:29 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727841AbgHNKu1 convert rfc822-to-8bit (ORCPT ); Fri, 14 Aug 2020 06:50:27 -0400 Received: from eu-smtp-delivery-151.mimecast.com ([185.58.86.151]:55022 "EHLO eu-smtp-delivery-151.mimecast.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727074AbgHNKuZ (ORCPT ); Fri, 14 Aug 2020 06:50:25 -0400 Received: from AcuMS.aculab.com (156.67.243.126 [156.67.243.126]) (Using TLS) by relay.mimecast.com with ESMTP id uk-mta-77-hlXDbR_fMUqZEGGj0cm_GA-1; Fri, 14 Aug 2020 11:50:21 +0100 X-MC-Unique: hlXDbR_fMUqZEGGj0cm_GA-1 Received: from AcuMS.Aculab.com (fd9f:af1c:a25b:0:43c:695e:880f:8750) by AcuMS.aculab.com (fd9f:af1c:a25b:0:43c:695e:880f:8750) with Microsoft SMTP Server (TLS) id 15.0.1347.2; Fri, 14 Aug 2020 11:50:20 +0100 Received: from AcuMS.Aculab.com ([fe80::43c:695e:880f:8750]) by AcuMS.aculab.com ([fe80::43c:695e:880f:8750%12]) with mapi id 15.00.1347.000; Fri, 14 Aug 2020 11:50:20 +0100 From: David Laight To: "linux-sctp@vger.kernel.org" CC: "netdev@vger.kernel.org" Subject: num_ostreams and max_instreams negotiation Thread-Topic: num_ostreams and max_instreams negotiation Thread-Index: AdZyJ9ADjH3a7lNFS5SQSVqLsdlEog== Date: Fri, 14 Aug 2020 10:50:20 +0000 Message-ID: <0b4319e4b2cf4ee68fc2b0183536aa7a@AcuMS.aculab.com> Accept-Language: en-GB, en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-ms-exchange-transport-fromentityheader: Hosted x-originating-ip: [10.202.205.107] MIME-Version: 1.0 Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=C51A453 smtp.mailfrom=david.laight@aculab.com X-Mimecast-Spam-Score: 0.001 X-Mimecast-Originator: aculab.com Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8BIT Sender: netdev-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org At some point the negotiation of the number of SCTP streams seems to have got broken. I've definitely tested it in the past (probably 10 years ago!) but on a 5.8.0 kernel getsockopt(SCTP_INFO) seems to be returning the 'num_ostreams' set by setsockopt(SCTP_INIT) rather than the smaller of that value and that configured at the other end of the connection. I'll do a bit of digging. David - Registered Address Lakeside, Bramley Road, Mount Farm, Milton Keynes, MK1 1PT, UK Registration No: 1397386 (Wales)