netdev - Re: PF_RING: Include in main line kernel?

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Date:	Thu, 15 Oct 2009 09:33:53 -0700
From:	Ben Greear <greearb@...delatech.com>
To:	Evgeniy Polyakov <zbr@...emap.net>
CC:	David Miller <davem@...emloft.net>, deri@...p.org,
	shemminger@...tta.com, brad.doctor@...il.com,
	netdev@...r.kernel.org
Subject: Re: PF_RING: Include in main line kernel?

On 10/15/2009 12:02 AM, Evgeniy Polyakov wrote:
> On Wed, Oct 14, 2009 at 02:49:23PM -0700, David Miller (davem@...emloft.net) wrote:
>>> Maybe something similar to the attached patch?
>>
>> This is not something I'm interested in applying.
>>
>> It makes implementing proprietary complete networking stacks
>> for Linux way too easy.
>
> Such kernels will be tainted and thus its bugs and problems will be
> clearly indicated by the proprietary module.
>
>> Instead I'd rather have a GPL exported function that allows indication
>> of consumption somehow.  That's why we have a special hook for
>> bonding, so it cannot be abused in proprietary modules.
>
> I believe bonding with its hook is a historical heritage and priority
> absence in packet hooks which do not currently allow something to be
> registered very first and steal packets from the stack.
>
> Looks like bonding could be implemented as a packet handler with Ben's
> patch applied, isn't it?

Bonding, bridging, mac-vlans, pktgen-rx logic, sniffers, and others could.  The only trick is
ordering...it may be better to keep the hard-coded hooks in a definite
order than to allow users to switch them around.

Or, could have a precedence value when adding hooks (protocols) so that modules
can properly order themselves by default, but users *could* reorder
them if they really wanted to (might be useful to have mac-vlans before
bonding some of the time, and after it others, for instance...)

Thanks,
Ben

-- 
Ben Greear <greearb@...delatech.com>
Candela Technologies Inc  http://www.candelatech.com

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