netdev - Re: [PATCH ipsec-next 2/2] xfrm: configure policy hash table thresholds by /proc

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Message-ID: <537F0715.7010207@6wind.com>
Date:	Fri, 23 May 2014 10:30:13 +0200
From:	Christophe Gouault <christophe.gouault@...nd.com>
To:	David Laight <David.Laight@...LAB.COM>,
	'Steffen Klassert' <steffen.klassert@...unet.com>
CC:	"David S. Miller" <davem@...emloft.net>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: Re: [PATCH ipsec-next 2/2] xfrm: configure policy hash table thresholds
 by /proc

On 05/22/2014 12:15 PM, David Laight wrote:
> From: Klassert
> ...
>>> Exporting a userland API (here by /proc) enables a user or a daemon to
>>> choose a strategy according to information the kernel does not
>>> necessarily have, and enables to implement various (possibly complex)
>>> policies.
>>>
>>
>> If we add a user API for the current lookup mechanism, we will stick
>> with this because we can't change it anymore without breaking userspace.
>> So I don't want to add one before we finally decided on a long term
>> lookup mechanism for IPsec.
>
> You could have a user API call to find the list of available mechanisms
> as well as one that returns/sets the current one.
> Then there is no actual requirement to continue to support any specific one.
>
> 	David

Hi David,

It sounds like a brilliant idea, since we will probably need to support
several types of mechanisms. If nobody objects, I can start working on
such API.

Any preference on the type of API? (/proc, netlink, ioctl?...)

Christophe
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