netdev - Re: [PATCH] crypto: aesni-intel

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Date:	Thu, 13 Nov 2014 09:52:34 +0800
From:	Ming Liu <ming.liu@...driver.com>
To:	Steffen Klassert <steffen.klassert@...unet.com>
CC:	Herbert Xu <herbert@...dor.apana.org.au>, <davem@...emloft.net>,
	<ying.xue@...driver.com>, <linux-crypto@...r.kernel.org>,
	<netdev@...r.kernel.org>
Subject: Re: [PATCH] crypto: aesni-intel - avoid IPsec re-ordering

On 11/12/2014 07:43 PM, Steffen Klassert wrote:
> On Wed, Nov 12, 2014 at 06:41:30PM +0800, Ming Liu wrote:
>> On 11/12/2014 04:51 PM, Herbert Xu wrote:
>>> On Wed, Nov 12, 2014 at 09:41:38AM +0100, Steffen Klassert wrote:
>>>> Can't we just use cryptd unconditionally to fix this reordering problem?
>>> I think the idea is that most of the time cryptd isn't required
>>> so we want to stick with direct processing to lower latency.
>>>
>>> I think the simplest fix would be to punt to cryptd as long as
>>> there are cryptd requests queued.
>> I've tried that method when I started to think about the fix, but it
>> will cause 2 other issues per test while resolving the reordering
>> one, as follows:
>> 1 The work queue can not handle so many packets when the traffic is
>> very high(over 200M/S), and it would drop most of them when the
>> queue length is beyond CRYPTD_MAX_CPU_QLEN.
> That's why I've proposed to adjust CRYPTD_MAX_CPU_QLEN in my other mail.
> But anyway, it still does not fix the reorder problem completely.
> We still have a problem if subsequent algorithms run asynchronously
> or if we get interrupted while we are processing the last request
> from the queue.
>
> I think we have only two options, either processing all calls
> directly or use cryptd unconditionally. Mixing direct and
> asynchronous calls will lead to problems.
>
> If we don't want to use cryptd unconditionally, we could use
> direct calls for all requests. If the fpu is not usable, we
> maybe could fallback to an algorithm that does not need the
> fpu, such as aes-generic.
Yes, this is a good idea, I will try to work on it based on your 
suggestion. Thanks!

the best,
thank you
>
>
>

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