netdev - RE: Linux 2.6.35/TIPC 2.0 ABI breaking changes

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Date:	Wed, 20 Oct 2010 14:37:02 -0400
From:	Jon Maloy <jon.maloy@...csson.com>
To:	Leandro Lucarella <luca@...cax.com.ar>
CC:	Neil Horman <nhorman@...driver.com>,
	David Miller <davem@...emloft.net>,
	"paul.gortmaker@...driver.com" <paul.gortmaker@...driver.com>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"tipc-discussion@...ts.sourceforge.net" 
	<tipc-discussion@...ts.sourceforge.net>
Subject: RE: Linux 2.6.35/TIPC 2.0 ABI breaking changes

<...>

> 
> 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?

Both. And, given TIPC fundamental "location transparency" principle
the sender (or receiver) at user level does not need to know the 
difference.
For a TIPC user, all messages are "local", insofar they stay within
the same cluster.

> 
> 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.

There are plenty of protocols around not using NBO over the wire.
This is not a must. 

> 
> 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)
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