netdev - RE: [RFC PATCH] rtnetlink: Add filter for VF info dump requests

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Date:	Thu, 9 Feb 2012 16:25:31 +0000
From:	"Rose, Gregory V" <gregory.v.rose@...el.com>
To:	David Miller <davem@...emloft.net>
CC:	"netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: RE: [RFC PATCH] rtnetlink: Add filter for VF info dump requests

> -----Original Message-----
> From: David Miller [mailto:davem@...emloft.net]
> Sent: Wednesday, February 08, 2012 5:10 PM
> To: Rose, Gregory V
> Cc: netdev@...r.kernel.org
> Subject: Re: [RFC PATCH] rtnetlink: Add filter for VF info dump requests
> 
> From: Greg Rose <gregory.v.rose@...el.com>
> Date: Tue, 07 Feb 2012 14:33:46 -0800
> 
> > Add a 256 bit filter to allow the user to filter which VFs' info will
> > get displayed during the dump info request.  This is to fix a bug in
> > which a an info dump request on a device with many VFs would overflow
> > the recvmsg buffer which is allocated to max(8192, PAGE_SIZE).  A
> > complimentary patch to the iproute2 ip tool will allow the user to
> > set/clear individual VF filters.
> >
> > Signed-off-by: Greg Rose <gregory.v.rose@...el.com>
> 
> This isn't the idea.
> 
> I meant we have to add a generic u32 mask attribute to the GETLINK
> requests, and it's a mask of "features".  One feature bit would be for
> enabling the "VF" part of the dump, another bit would be for the
> macvlan source address lists that are being proposed, etc.  Any new
> auxiliarry information type we want to add to devide dumps, we have
> to add a feature bit for in this mask.
> 
> And then you can't just stop there, you have to update all of the
> logic related to min_ifinfo_dump_size to take into account the current
> request's mask state.
> 
> In fact this means you must get rid of the min_info_dump_size global
> variable altogether because the size is context dependent upon the
> mask configuration of the current dump request.

That will change the semantics to the 'ip link show' command quite a bit.  But OK, let me see what I can do with that.

- Greg


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