netdev - Re: [PATCH (net-next.git) 16/18] stmmac: do not perform zero-copy for rx frames

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Message-ID: <56714C08.7040701@st.com>
Date:	Wed, 16 Dec 2015 12:33:28 +0100
From:	Giuseppe CAVALLARO <peppe.cavallaro@...com>
To:	David Miller <davem@...emloft.net>
CC:	<netdev@...r.kernel.org>, <alexandre.torgue@...com>
Subject: Re: [PATCH (net-next.git) 16/18] stmmac: do not perform zero-copy
 for rx frames

On 12/12/2015 2:09 AM, David Miller wrote:
> From: Giuseppe Cavallaro <peppe.cavallaro@...com>
> Date: Wed, 9 Dec 2015 09:37:52 +0100
>
>> @@ -98,6 +98,10 @@ static int buf_sz = DEFAULT_BUFSIZE;
>>   module_param(buf_sz, int, S_IRUGO | S_IWUSR);
>>   MODULE_PARM_DESC(buf_sz, "DMA buffer size");
>>
>> +static int minrx = 256;
>> +module_param(minrx, int, S_IRUGO | S_IWUSR);
>> +MODULE_PARM_DESC(minrx, "Copy only tiny-frames");
>> +
>
> When you type module_param() in a network driver, you ought to receive
> an electric shock in order to remind you that except in the most extreme
> cases module parameters are absolutely not appropriate.
>
> In this case we have an ethtool tunable people can use to control copy
> break values like this, so use that instead.

ok, v2 will have this change. Let me know if there is other to fix.

Peppe

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