netdev - Re: [RFC V2 PATCH] rtnetlink: Fix problem with buffer allocation

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Message-ID: <20120213092851.61a3d1b1@nehalam.linuxnetplumber.net>
Date:	Mon, 13 Feb 2012 09:28:51 -0800
From:	Stephen Hemminger <shemminger@...tta.com>
To:	Greg Rose <gregory.v.rose@...el.com>
Cc:	netdev@...r.kernel.org, davem@...emloft.net
Subject: Re: [RFC V2 PATCH] rtnetlink: Fix problem with buffer allocation

On Sun, 12 Feb 2012 11:13:42 -0800
Greg Rose <gregory.v.rose@...el.com> wrote:

> Implement a new nlattr type IFLA_EXT_MASK.  The mask is a 32 bit
> value that can be used to indicate to the kernel that certain
> extended ifinfo values are requested by the user application.
> At this time the only mask value created is RTEXT_FILTER_VF to
> indicate that the user wants the ifinfo dump to send information
> about the VFs belonging to the interface.
> 
> I have kept the NLM_F_EXT nlmsg_flags bit to indicate to the kernel
> that the extended ifinfo dump filter mask is present.  It does not
> act as the filter itself which has changed since the first submission
> of this RFC.  Older versions of user applications won't set this
> flag which should fix the problem of some applications not allocating
> a large enough buffer for all the extended interface information.
> 
> Signed-off-by: Greg Rose <gregory.v.rose@...el.com>

Is u32 going to be enough in next 5 years?
Since it is TLV value it should work with bigger value;
could you try sending a oversize attribute and code kernel to ignore
bits it doesn't understand?

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