linux-kernel - Re: Linux 2.6.35/TIPC 2.0 ABI breaking changes

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Message-ID: <20101019132844.GB14410@hmsreliant.think-freely.org>
Date:	Tue, 19 Oct 2010 09:28:44 -0400
From:	Neil Horman <nhorman@...driver.com>
To:	Leandro Lucarella <luca@...cax.com.ar>
Cc:	David Miller <davem@...emloft.net>, paul.gortmaker@...driver.com,
	jon.maloy@...csson.com, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org, tipc-discussion@...ts.sourceforge.net
Subject: Re: Linux 2.6.35/TIPC 2.0 ABI breaking changes

On Tue, Oct 19, 2010 at 10:19:36AM -0300, Leandro Lucarella wrote:
> Neil Horman, el 19 de octubre a las 07:04 me escribiste:
> > On Tue, Oct 19, 2010 at 01:16:49AM -0700, David Miller wrote:
> > > From: Leandro Lucarella <luca@...cax.com.ar>
> > > Date: Mon, 18 Oct 2010 23:16:57 -0300
> > > 
> > > > 
> > > > The problem is not between the tipc stacks in different hosts, is
> > > > between the tipc stack and the applications using it (well, maybe
> > > > there is a problem somewhere else too).
> > > > 
> > > > This was a deliberate API change, not a subtle bug...
> > > 
> > > Neil et al., if these packets live only between the kernel stack
> > > and the userspace API layer, we should not be byte-swapping this
> > > stuff and we need to fix this fast.
> > > 
> > Copy that Dave.  I think I see the problem.  The subscription code handles
> > messages both off the wire and from local user space.  The off the wire case
> > should work because the subscription code assumes that all the incomming data is
> > in network byte order, but user space is an exception to that rule as its in
> > local byte order.  I'll have a patch together for Leandro to test soon.
> > Neil
> 
> Thank you very much. Bare in mind that the byte order is just one of the
> problems, the other problem is the change in the value of
> TIPC_SUB_SERVICE from 2 to 0. That too is breaking the API/ABI, as
> a message with a filter value of 2 is rejected by TIPC 2.0/2.6.35+.
> 
Yeah, that was the format change.  We might just need to revert that.  Lets see
about getting the endianess issue straight, and we'll go from there.
Neil

> -- 
> Leandro Lucarella (AKA luca)                     http://llucax.com.ar/
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