netdev - Re: namespace support requires network modules to say "GPL"

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Message-ID: <4751C238.6010609@rtr.ca>
Date:	Sat, 01 Dec 2007 15:21:12 -0500
From:	Mark Lord <lkml@....ca>
To:	"Eric W. Biederman" <ebiederm@...ssion.com>
Cc:	Stephen Hemminger <shemminger@...ux-foundation.org>,
	Alan Cox <alan@...rguk.ukuu.org.uk>,
	Greg Kroah-Hartman <gregkh@...e.de>, Greg KH <greg@...ah.com>,
	Tejun Heo <htejun@...il.com>,
	Linux Containers <containers@...ts.osdl.org>,
	netdev@...r.kernel.org, cornelia.huck@...ibm.com,
	stern@...land.harvard.edu, kay.sievers@...y.org,
	linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	Herbert Xu <herbert@...dor.apana.org.au>,
	David Miller <davem@...emloft.net>,
	Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: namespace support requires network modules to say "GPL"

Eric W. Biederman wrote:
> Stephen Hemminger <shemminger@...ux-foundation.org> writes:
> 
>> Actually, the whole mess would go away if the api for dev_get_by_XXXX hadn't
>> been changed in the namespace transition. IMHO the interface to
>> dev_get_by_name()
>> should not have added a namespace parameter, of the callers in the tree, only
>> two use a different namespace. So it would have been better to to introduce
>> dev_get_by_name_ns() with the extra parameter.
> 
> As a general rule if you are calling dev_get_by_name and taking an &init_net
> parameter that means you code has not yet been converted to actually support
> network namespaces.
> 
> Not everything can be safely changed at once so we take it by steps.  When
> the code fully supports network namespaces practically nothing will take
> an &init_net parameter.  The network namespace parameter will come in
> some form from userspace.  Either from current or from the network
> socket.
> 
> Except for boot time initialization I don't know of any cases using
> dev_get_by_XXXX that won't need to be modified before the network
> namespace work is complete.
> 
> I believe I mentioned that this getting the fully network namespace
> support was going to take a while and a bunch of patches at the
> outset.
> 
>> Can we get this resolved before 2.6.24 is released? Going back and forth
>> on API's is just needless frottage.
> 
> Sure.  We keep the updated dev_get_by_XXXX that takes a network
> namespace parameter.
..

And what should code be passing in when "# CONFIG_NET_NS is not set" ?
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