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

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Message-Id: <20120210.135151.754379087490167636.davem@davemloft.net>
Date:	Fri, 10 Feb 2012 13:51:51 -0500 (EST)
From:	David Miller <davem@...emloft.net>
To:	gregory.v.rose@...el.com
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.
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