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

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Date:	Wed, 20 Oct 2010 13:57:06 -0400
From:	Jon Maloy <jon.maloy@...csson.com>
To:	Leandro Lucarella <luca@...cax.com.ar>,
	Neil Horman <nhorman@...driver.com>
CC:	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

<...>
> subscr struct because 0x0 is a valid filter in TIPC 2.0.
> 

> 
> 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.

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. 


> 
> [1] http://tipc.sourceforge.net/doc/draft-spec-tipc-06.html
> [2] http://tipc.sourceforge.net/doc/draft-spec-tipc-06.html#anchor92
> 
> -- 
> Leandro Lucarella (AKA luca)                     http://llucax.com.ar/
> ----------------------------------------------------------------------
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> 	-- Crónica TV
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