netdev - Re: [PATCH v2 1/1] net: fec: implement rx_copybreak to improve rx performance

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Message-ID: <1411992739.30721.23.camel@edumazet-glaptop2.roam.corp.google.com>
Date:	Mon, 29 Sep 2014 05:12:19 -0700
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Fugang Duan <b38611@...escale.com>
Cc:	b20596@...escale.com, davem@...emloft.net, romieu@...zoreil.com,
	netdev@...r.kernel.org, shawn.guo@...aro.org,
	bhutchings@...arflare.com
Subject: Re: [PATCH v2 1/1] net: fec: implement rx_copybreak to improve rx
 performance

On Mon, 2014-09-29 at 15:47 +0800, Fugang Duan wrote:
> - Copy short frames and keep the buffers mapped, re-allocate skb instead of
>   memory copy for long frames.
> - Add support for setting/getting rx_copybreak using generic ethtool tunable
> 
> Changes V2:
> * Implements rx_copybreak

>  
> +#define COPYBREAK_DEFAULT 256
> +static unsigned int copybreak __read_mostly = COPYBREAK_DEFAULT;
> +module_param(copybreak, uint, 0644);
> +MODULE_PARM_DESC(copybreak,
> +		 "Maximum packet size that is copied to a new buffer on receive");
> +

It is not the right way to handle this.

Old drivers might still have a legacy module parameter.

New implementations should provide the new ethtool support, and only
this. No new module parameter is accepted.

For details, check following commits :

d4ad30b182305ecf97f145a5d4d1fd9e728c6d01 enic: Add tunable_ops support
for rx_copybreak

f0db9b073415848709dd59a6394969882f517da9 ethtool: Add generic options
for tunables


Or check the current tree :

git grep -n rx_copybreak drivers/net/ethernet/cisco/enic



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