From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754972Ab0JTSZv (ORCPT ); Wed, 20 Oct 2010 14:25:51 -0400 Received: from alerce.vps.bitfolk.com ([212.13.194.134]:2710 "EHLO alerce.vps.bitfolk.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751288Ab0JTSZt (ORCPT ); Wed, 20 Oct 2010 14:25:49 -0400 Date: Wed, 20 Oct 2010 15:24:11 -0300 From: Leandro Lucarella To: Jon Maloy Cc: Neil Horman , David Miller , "paul.gortmaker@windriver.com" , "netdev@vger.kernel.org" , "linux-kernel@vger.kernel.org" , "tipc-discussion@lists.sourceforge.net" Subject: Re: Linux 2.6.35/TIPC 2.0 ABI breaking changes Message-ID: <20101020182411.GO8781@llucax.com.ar> References: <4CBCD429.8090306@windriver.com> <20101018234547.GA5703@hmsreliant.think-freely.org> <20101019021657.GZ8781@llucax.com.ar> <20101019.011649.71113115.davem@davemloft.net> <20101019110452.GA14410@hmsreliant.think-freely.org> <20101019131936.GB8781@llucax.com.ar> <20101019201841.GC14410@hmsreliant.think-freely.org> <20101020172018.GN8781@llucax.com.ar> <0434463FDA60A94FA978ACA44617682DEE84668199@EUSAACMS0702.eamcs.ericsson.se> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <0434463FDA60A94FA978ACA44617682DEE84668199@EUSAACMS0702.eamcs.ericsson.se> X-Paranoid: Just because you're paranoid, don't mean they're not after you. User-Agent: Mutt/1.5.20 (2009-06-14) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Jon Maloy, el 20 de octubre a las 13:57 me escribiste: > > Another option is to change the TIPC 2.0 specification to use > > the old format (use HBO in subscriptions and keep > > TIPC_SUB_SERVICE as a separate flag with value 2) and forget > > about all this. After all, I can't see what advantages gives > > having to change the BO for internal messages between the > > applications and the stack. > > I agree with this. I have no problems with changing the draft > (which as Leandro already noted is "work-in-progress") to specify that > both HBO and NBO are permitted over the wire, and that it is the > topology server's task to keep track of which one is used. Just to try to understand better how things works, or are supposed to work: do the subscription and event messages (and I mean the struct tipc_subscr and tipc_event published in tipc.h) really go over the wire or are only used to communicate the stack to the application inside a node? I think this is a crucial matter, since it defines if the changes cross kernel/userspace boundaries only or it also crosses the kernel/network boundaries. > Remember, permitting both is a superset of the current one (NBO only) > so it is fully backwards compatible. We break absolutly nothing by > permitting this. I think if they really go through the wire, it should be in NBO, and if tipc_subscr and tipc_event are used only internally, we can still fix the userspace messages when sending them through the wire. In any case, I agree that the patches should be reverted and a solution should be planned with more time and consensus. Thanks. -- Leandro Lucarella (AKA luca) http://llucax.com.ar/ ---------------------------------------------------------------------- GPG Key: 5F5A8D05 (F8CD F9A7 BF00 5431 4145 104C 949E BFB6 5F5A 8D05) ---------------------------------------------------------------------- The world's best known word is "okay" The second most well-known word is "Coca-Cola"