netdev - Re: [PATCH 5/6] cxgb4: Add main driver file and driver Makefile

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Date:	Wed, 31 Mar 2010 14:31:13 -0500
From:	Steve Wise <swise@...ngridcomputing.com>
To:	David Miller <davem@...emloft.net>
CC:	shemminger@...tta.com, dm@...lsio.com, netdev@...r.kernel.org
Subject: Re: [PATCH 5/6] cxgb4: Add main driver file and driver Makefile

David Miller wrote:
> From: Stephen Hemminger <shemminger@...tta.com>
> Date: Tue, 30 Mar 2010 14:19:04 -0700
>
>   
>> On Tue, 30 Mar 2010 10:52:21 -0800
>> Dimitris Michailidis <dm@...lsio.com> wrote:
>>
>>     
>>> +static struct cxgb4_proc_entry proc_files[] = {
>>> +#ifdef CONFIG_PROC_FS
>>> +	{ "l2t", 0444, ADAP_NEED_L2T, 0, &t4_l2t_proc_fops },
>>> +#endif
>>> +	{ "lb_stats", 0444, 0, 0, &lb_stats_proc_fops },
>>> +	{ "path_mtus", 0644, 0, 0, &mtutab_proc_fops },
>>> +	{ "qstats", 0444, 0, 0, &sge_stats_proc_fops },
>>> +	{ "rss", 0444, 0, 0, &rss_proc_fops },
>>> +	{ "tcp_stats", 0444, 0, 0, &tcp_stats_proc_fops },
>>> +	{ "tids", 0444, ADAP_NEED_OFLD, 0, &tid_info_proc_fops },
>>> +	{ "tp_err_stats", 0444, 0, 0, &tp_err_stats_proc_fops },
>>> +	{ "trace0", 0644, 0, 0, &mps_trc_proc_fops },
>>> +	{ "trace1", 0644, 0, 1, &mps_trc_proc_fops },
>>> +	{ "trace2", 0644, 0, 2, &mps_trc_proc_fops },
>>> +	{ "trace3", 0644, 0, 3, &mps_trc_proc_fops },
>>> +	{ "uld", 0444, 0, 0, &uld_proc_fops },
>>> +};
>>> +
>>>       
>> Do you really need this large number of /proc files.
>> It creates another stable API to worry about.  If it is just for
>> debugging move it to debugfs, or better yet just drop it.
>>     
>
> I also find this a bit too much.
>
> We have all kinds of ways to export whatever statistics you
> want.  In particular we have ethtool stats of which you
> can have as many as you wish.
>
> If necessary, we could add a feature to define "views" of ethtool
> stats so that we can have domains of driver specific statistics if the
> problem is that you don't want all of these debugging stats to clutter
> up the "main" ethtool stats.
>
>   

This sounds interesting.  Dave, how would you envision the ethtool 
interface for this?  A new modifier to --statistics?  Like: 'ethtool 
--statistics ethX  viewname' where viewname could maybe be passed to the 
driver to allow arbitrary views?   Or something else?

Steve.



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