netdev - Re: [RFC] netlink broadcast return value

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Message-ID: <49903B03.2040302@trash.net>
Date:	Mon, 09 Feb 2009 15:17:39 +0100
From:	Patrick McHardy <kaber@...sh.net>
To:	David Miller <davem@...emloft.net>
CC:	pablo@...filter.org, netdev@...r.kernel.org,
	netfilter-devel@...r.kernel.org
Subject: Re: [RFC] netlink broadcast return value

David Miller wrote:
> From: Pablo Neira Ayuso <pablo@...filter.org>
> Date: Sun, 01 Feb 2009 14:33:57 +0100
> 
>> In short, I think that the change that I'm proposing would also require
>> to fix some netlink_broadcast() clients to skip ENOBUFS errors: they are
>> not meaningful for them since they assume that Netlink is unreliable and
>> so the return value does not provide any useful information.
> 
> I think this analysis is accurate.

We have at least one case where the caller wants to know of
any successful delivery. Keymanager queries done by xfrm_state
want to know whether an acquire was delivered to any keymanager.
So we need to continue to indicate this, maybe using a different
errno code than -ENOBUFS. I don't have a suggestion which one to
use though.
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