netdev - Re: [PATCH][XFRM] export SPD info

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Message-Id: <20070428.211936.35015201.davem@davemloft.net>
Date:	Sat, 28 Apr 2007 21:19:36 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	hadi@...erus.ca
Cc:	kaber@...sh.net, netdev@...r.kernel.org
Subject: Re: [PATCH][XFRM] export SPD info

From: jamal <hadi@...erus.ca>
Date: Fri, 27 Apr 2007 10:29:28 -0400

> On Fri, 2007-27-04 at 15:55 +0200, Patrick McHardy wrote:
> 
> > 
> > It it really worth the extra code for dumping them conditionally?
> > The attributes are neither large nor will they be sent very often.
> > 
> 
> That thought did cross my mind when i was coding this;-> I hate the way
> netlink filters are done in user space with iproute2 - dumping 50
> objects just so i can get to one. So i used that as my guiding
> principle; i have no qualms with the few extra lines.
> Actually, I was hoping it would provide motivation for someone else to
> do a better filtering scheme (which sits in the kernel).

I think filtering in the kernel makes sense when the kernel
is in a unique place to make the algorithmic complexity of the
filtering minimal.  The TCP socket dumping is a good example
of that.

For things like this I think it's really unnecessary.

Figure out what the basic information is and just provide it every
time.  You have a full release cycle to work out what that is, and if
we miss anything, afterwards we can still extend with attributes.
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