netdev - Re: [PATCH] intel: make wired ethernet driver message level consistent

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Date:	Sun, 11 Mar 2012 00:38:57 +0000
From:	Ben Hutchings <bhutchings@...arflare.com>
To:	Stephen Hemminger <shemminger@...tta.com>
CC:	Dan Carpenter <dan.carpenter@...cle.com>,
	Jeff Kirsher <jeffrey.t.kirsher@...el.com>,
	Jesse Brandeburg <jesse.brandeburg@...el.com>,
	Bruce Allan <bruce.w.allan@...el.com>,
	Carolyn Wyborny <carolyn.wyborny@...el.com>,
	Don Skidmore <donald.c.skidmore@...el.com>,
	Greg Rose <gregory.v.rose@...el.com>,
	Peter P Waskiewicz Jr <peter.p.waskiewicz.jr@...el.com>,
	Alex Duyck <alexander.h.duyck@...el.com>,
	John Ronciak <john.ronciak@...el.com>,
	"David S. Miller" <davem@...emloft.net>,
	<e1000-devel@...ts.sourceforge.net>, <netdev@...r.kernel.org>,
	<kernel-janitors@...r.kernel.org>
Subject: Re: [PATCH] intel: make wired ethernet driver message level
 consistent

On Sat, 2012-03-10 at 16:01 -0800, Stephen Hemminger wrote:
> Dan Carpenter noticed that ixgbevf initial default was different than
> the rest. But the problem is broader than that, only one Intel driver (ixgb)
> was doing it right.
> 
> The convention for default debug level should be consistent among
> Intel drivers and follow established convention.
[...]
> --- a/drivers/net/ethernet/intel/e1000/e1000_main.c	2012-02-27 08:43:02.348936997 -0800
> +++ b/drivers/net/ethernet/intel/e1000/e1000_main.c	2012-03-10 15:50:57.199452804 -0800
> @@ -215,7 +215,8 @@ MODULE_DESCRIPTION("Intel(R) PRO/1000 Ne
>  MODULE_LICENSE("GPL");
>  MODULE_VERSION(DRV_VERSION);
>  
> -static int debug = NETIF_MSG_DRV | NETIF_MSG_PROBE;
> +#define DEFAULT_DEBUG_LEVEL_SHIFT 3

Wonder if this should really be 2 (enable DRV and PROBE) or 3 (enable
DRV, PROBE and LINK; equivalent to current behaviour)?

> +static int debug = DEFAULT_DEBUG_LEVEL_SHIFT;
>  module_param(debug, int, 0);
>  MODULE_PARM_DESC(debug, "Debug level (0=none,...,16=all)");
>  
> @@ -979,7 +980,7 @@ static int __devinit e1000_probe(struct
>  	adapter = netdev_priv(netdev);
>  	adapter->netdev = netdev;
>  	adapter->pdev = pdev;
> -	adapter->msg_enable = (1 << debug) - 1;
> +	adapter->msg_enable = netif_msg_init(debug, DEFAULT_DEBUG_LEVEL_SHIFT);
[...]

This works, but not the way you intended.  The first parameter is
supposed to be a module parameter with a default of -1.  The second
parameter is supposed to be the bitmask to use when that default is not
overridden.

Ben.

-- 
Ben Hutchings, Staff Engineer, Solarflare
Not speaking for my employer; that's the marketing department's job.
They asked us to note that Solarflare product names are trademarked.

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