netdev - Re: [QUESTION] multi-core, multi-crypto, ipsec/udp out of order.

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Date:	Mon, 2 Jun 2014 20:46:49 +0800
From:	Herbert Xu <herbert@...dor.apana.org.au>
To:	"Hsieh, Che-Min" <cheminh@....qualcomm.com>
Cc:	"linux-crypto@...r.kernel.org" <linux-crypto@...r.kernel.org>,
	netdev@...r.kernel.org,
	Steffen Klassert <steffen.klassert@...unet.com>
Subject: Re: [QUESTION] multi-core, multi-crypto,  ipsec/udp out of order.

On Fri, May 30, 2014 at 02:22:17PM +0000, Hsieh, Che-Min wrote:
> Hi! Herbert:
> 
>   In a system of multi cpu core, with multiple crypto hardware, different irq for each, is it possible the udp receive get out of order for the same tfm?
>  
> Let us say, of the same tfm, driver distributes requests to any available crypto hardware.  For the same tfm, driver re-sequences response before complete callout to the same arrival sequence of the requests. The complete callout is running at tasklet level of the system.
> 
> Each irq is assigned to a different irq affinity cpu core to improve the performance. Therefore the iprecv and ipsec processing can be done by multiple cpu cores at the same time for the same tfm/udp.
> 
> I am seeing the following -   if I assign irq affinity to different cpu cores, iperf server of udp session displays receive out of order message. If I assign them to the same core, or take default, then message stops. The assignment is done by hand while the system is running, by updating  /proc/irq/xxx/smp_affinity, where xxx is the irq number. This scenario is very repeatable. 
> 
> We are on linux-3.10.
> 
> Does it make sense?

Are we talking about an in-tree driver? If so which one?

It's not certainly not meant to change packet ordering.

Cheers,
-- 
Email: Herbert Xu <herbert@...dor.apana.org.au>
Home Page: http://gondor.apana.org.au/~herbert/
PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt
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