netdev - Re: [PATCH] netem/iproute2 solving correlated loss issues [0/5]

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Message-ID: <4B2CA0BC.5080905@uniroma2.it>
Date:	Sat, 19 Dec 2009 10:45:32 +0100
From:	Stefano Salsano <stefano.salsano@...roma2.it>
To:	David Miller <davem@...emloft.net>
CC:	netdev@...r.kernel.org, fabio.ludovici@...oo.it,
	Stephen Hemminger <shemminger@...tta.com>
Subject: Re: [PATCH] netem/iproute2 solving correlated loss issues [0/5]

David Miller wrote:
>> The patch is backward compatible, we have not removed the previous...
> 
> To heck it is!
> The changed version of iproute2 will not work without the kernel
> changes installed.  The kernel validates the size of the structures
> passed in, you can't change the user visible interface like this.

David Miller wrote:
 > Furthermore it is fundamentally flawed in it's implementation
 > in that the user exported data structures cannot be changed,
 > you cannot change the layout and you absolutely cannot
 > change the size of these things or else various tool and
 > kernel combinations stop working.

thank you for raising these fundamental issues !
we will address them and resubmit the patch when done...

 > Add new netlink attributes to extend things, that's the "real"
 > backwards compatible way to make changes to netlink interfaces.

point taken

-- 
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Stefano Salsano
Dipartimento Ingegneria Elettronica
Universita' di Roma "Tor Vergata"
Via del Politecnico, 1 - 00133 Roma - ITALY

http://netgroup.uniroma2.it/Stefano_Salsano/

E-mail  : stefano.salsano@...roma2.it
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