netdev - Re: [Patch net-next 04/11] net:fec: add multiqueue support

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Date:	Wed, 03 Sep 2014 14:27:21 -0700
From:	Florian Fainelli <f.fainelli@...il.com>
To:	Frank Li <Frank.Li@...escale.com>, b38611@...escale.com,
	davem@...emloft.net, netdev@...r.kernel.org, lznuaa@...il.com
CC:	shawn.guo@...aro.org, linux-arm-kernel@...ts.infradead.org,
	devicetree@...r.kernel.org
Subject: Re: [Patch net-next 04/11] net:fec: add multiqueue support

On 09/03/2014 01:38 PM, Frank Li wrote:
> From: Fugang Duan <B38611@...escale.com>
> 
> Add multiqueue support, which is compatible with previous single queue
> driver for FEC/ENET IPs.
> 
> By default, the tx/rx queue number is 1, user can config the queue number
> at DTS file like this:
> 	fsl,num_tx_queues=<3>;
> 	fsl,num_rx_queues=<3>;
> 
> Ethernet multiqueue mechanism can improve performance in SMP system.
> For single hw queue, multiqueue can balance cpu loading.
> For multi hw queues, multiple cores can process network packets in parallel,
> and refer the article for the detail advantage for multiqueue:
> http://vger.kernel.org/~davem/davem_nyc09.pdf

You should probably split that patch in a minimum of two, or more
different parts.

Two parts:

- add TX multiqueue support
- add RX multiqueue support

More parts:

- prepare for TX multiqueue (introduce queue structure, definitions)
- transition TX path to use queue 0
- add support for the two other TX queues
- prepare for RX multiqueue (introduce queue structure, definitions)
- prepare for multiqueue, hardcode RX path to use queue 0
- add support for the two other RX queues

The number of changes are extremely hard to review...
--
Florian
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