netdev - Re: [PATCH 1/2] [RFC] NET: Implement a standard ndev

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Date:	Mon, 11 Jun 2007 15:43:14 -0700
From:	"Kok, Auke" <auke-jan.h.kok@...el.com>
To:	Stephen Hemminger <shemminger@...ux-foundation.org>
CC:	netdev@...r.kernel.org, jeff@...zik.org, davem@...emloft.net,
	arjan@...ux.intel.com, joe@...ches.com
Subject: Re: [PATCH 1/2] [RFC] NET: Implement a standard ndev_printk family

Stephen Hemminger wrote:
> On Mon, 11 Jun 2007 14:37:21 -0700
> Auke Kok <auke-jan.h.kok@...el.com> wrote:
> 
>> A lot of netdevices implement their own variant of printk and use
>> use variations of dev_printk, printk or others that use msg_enable,
>> which has been an eyesore with countless variations across drivers.
>>
>> This patch implements a standard ndev_printk and derivatives
>> such as ndev_err, ndev_info, ndev_warn that allows drivers to
>> transparently use both the msg_enable and a generic netdevice
>> message layout. It moves the msg_enable over to the net_device
>> struct and allows drivers to obsolete ethtool handling code of
>> the msg_enable value.
>>
>> The current code has each driver contain a copy of msg_enable and
>> handle the setting/changing through ethtool that way. Since the
>> netdev name is stored in the net_device struct, those two are
>> not coherently available in a uniform way across all drivers (a
>> single macro or function would not work since all drivers name
>> their net_device members differently). This makes netdevice
>> driver writes reinvent the wheel over and over again.
>>
>> It thus makes sense to move msg_enable to the net_device. This
>> gives us the opportunity to (1) initialize it by default with a
>> globally sane value, (2) remove msg_enable handling code w/r
>> ethtool for drivers that know and use the msg_enable member
>> of the net_device struct. (3) Ethtool code can just modify the
>> net_device msg_enable for drivers that do not have custom
>> msg_enable get/set handlers so converted drivers lose some
>> code for that as well.
>>
>> Signed-off-by: Auke Kok <auke-jan.h.kok@...el.com>
>> ---
>>
>>  include/linux/netdevice.h |   38 ++++++++++++++++++++++++++++++++++++++
>>  net/core/dev.c            |    5 +++++
>>  net/core/ethtool.c        |   14 +++++++-------
>>  3 files changed, 50 insertions(+), 7 deletions(-)
>>
>> diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
>> index 3a70f55..d185f41 100644
>> --- a/include/linux/netdevice.h
>> +++ b/include/linux/netdevice.h
>> @@ -540,6 +540,8 @@ struct net_device
>>  	struct device		dev;
>>  	/* space for optional statistics and wireless sysfs groups */
>>  	struct attribute_group  *sysfs_groups[3];
>> +
>> +	int			msg_enable;
>>  };
> 
> Since msg_enable is used as bits, it should be unsigned (probably unsigned long).

ack, but the long is really not needed here I think - we're only using the first 15.

Auke
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