netdev - Re: [PATCH 5/7] CAN: Add virtual CAN netdevice driver

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Date:	Wed, 03 Oct 2007 19:47:37 +0200
From:	Oliver Hartkopp <oliver@...tkopp.net>
To:	David Miller <davem@...emloft.net>, shemminger@...ux-foundation.org
CC:	acme@...stprotocols.net, urs@...ogud.escape.de,
	netdev@...r.kernel.org, kaber@...sh.net, tglx@...utronix.de,
	yoshfuji@...ux-ipv6.org, ebiederm@...ssion.com,
	oliver.hartkopp@...kswagen.de, urs.thuermann@...kswagen.de
Subject: Re: [PATCH 5/7] CAN: Add virtual CAN netdevice driver

David Miller wrote:
> From: Stephen Hemminger <shemminger@...ux-foundation.org>
> Date: Tue, 2 Oct 2007 14:52:36 -0700
>
>   
>> Please consider using netif_msg_xxx() and module parameter to set
>> default message level, like other real network drivers already do.
>>     
>
> I keep seeing this recommendation, but the two supposedly most mature
> and actively used drivers in the tree, tg3 and e1000 and e1000e, all
> do not use this scheme.
>
> In fact there are tons of drivers that even hook up the ethtool
> msg_level setting function and never even use the value.
>
> If people aren't using netif_msg_xxx() and the ethtool msg_level
> facilities properly, it's because there is a severe dearth of good
> example drivers to learn about it from.
>   

The currently available CAN netdevice drivers do not have a common debug 
concept neither any runtime control mechanism for this debugging. So 
netif_msg_xxx() is definitely worth to look at instead of creating any 
new stuff in this direction, before posting any 'real' CAN network 
driver here.

Thanks very much for that hint!

Oliver
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