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

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Message-ID: <C5551D9AAB213A418B7FD5E4A6F30A0702F88CF8@ORSMSX106.amr.corp.intel.com>
Date:	Fri, 10 Feb 2012 19:07:15 +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: Fix problem with buffer allocation

> -----Original Message-----
> From: David Miller [mailto:davem@...emloft.net]
> Sent: Friday, February 10, 2012 10:52 AM
> To: Rose, Gregory V
> Cc: netdev@...r.kernel.org
> Subject: Re: [RFC PATCH] rtnetlink: Fix problem with buffer allocation
> 
> From: Greg Rose <gregory.v.rose@...el.com>
> Date: Fri, 10 Feb 2012 07:05:18 -0800
> 
> > +/*
> > + * Applications that set NLM_F_EXT have allocated
> > + * a 16K or larger buffer.
> > + * (Or they should have before using this flag)
> > + */
> > +#define NLM_F_EXT	0x800   /* Get extended interface info such as VFs
> */
> 
> This is not what I meant.
> 
> I meant to add a "netlink attribute" that gets passed in with GETLINK
> requests.  Which is a u32 set of flag bits, one bit for each extended
> feature.  So VF would get one bit.
> 
> Like "IFLA_EXT_MASK" or similar.
> 
> Then rtnl_getlink() would inspect the mask (using nla_get_32()), if
> present, and make this control what extended parts of the per-link
> dump are provided.

OK, sounds good.  How about I also add a field to indicate the application buffer size?

- Greg
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