netdev - Re: ethtool: Expand ethtool

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Message-ID: <488E11B3.6070901@garzik.org>
Date:	Mon, 28 Jul 2008 14:36:35 -0400
From:	Jeff Garzik <jeff@...zik.org>
To:	Brandon Philips <brandon@...p.org>
CC:	David Miller <davem@...emloft.net>, rick.jones2@...com,
	netdev@...r.kernel.org, jgarzik@...ox.com
Subject: Re: ethtool: Expand ethtool_cmd.speed to 32 bits

Brandon Philips wrote:
> On 15:43 Tue 15 Jul 2008, David Miller wrote:
>> From: Brandon Philips <brandon@...p.org>
>> Date: Tue, 15 Jul 2008 23:47:09 -0700
>>
>>> On 15:27 Tue 15 Jul 2008, David Miller wrote:
>>>> From: Rick Jones <rick.jones2@...com>
>>>> Date: Tue, 15 Jul 2008 14:53:16 -0700
>>>>
>>>>> Brandon Philips wrote:
>>>>>> Introduce the speed_hi field to ethtool_cmd, using the reserved space,
>>>>>> to expand the speed field to 2^32 Megabits/second.
>>>>>>
>>>>>> Making this field expansion now gives us plenty of time to fix up the
>>>>>> user-space pieces that use SIOCETHTOOL before hardware faster than 64
>>>>>> Gb/s is available.
>>>>>>
>>>>>> Signed-off-by: Brandon Philips <bphilips@...e.de>
>>>>>>
>>>>>> ---
>>>>>>  include/linux/ethtool.h |   17 ++++++++++++++++-
>>>>>>  1 file changed, 16 insertions(+), 1 deletion(-)
>>>>>>
>>>>>> Index: linux-2.6/include/linux/ethtool.h
>>>>>> ===================================================================
>>>>>> --- linux-2.6.orig/include/linux/ethtool.h
>>>>>> +++ linux-2.6/include/linux/ethtool.h
>>>>>> @@ -27,9 +27,24 @@ struct ethtool_cmd {
>>>>>>  	__u8	autoneg;	/* Enable or disable autonegotiation */
>>>>>>  	__u32	maxtxpkt;	/* Tx pkts before generating tx int */
>>>>>>  	__u32	maxrxpkt;	/* Rx pkts before generating rx int */
>>>>>> -	__u32	reserved[4];
>>>>>> +	__u16	speed_hi;
>>>>>> +	__u16	reserved2;
>>>>>> +	__u32	reserved[3];
>>>>>>  };
>>>>> I certainly agree with the concept of preparing for faster NICs.  Are 
>>>>> bits in that structure sufficiently precious to go the split route, or 
>>>>> would it be cleaner to just grab a contiguous 32 bits from the structure?
>>>> That's less space we can use to make similar expansions.
>>>>
>>>> And we have to keep the existing u16 chunk there anyways, because existing
>>>> applications are only going to provide that part.
>>> Agreed.  Can this be queued for 2.6.27 then?
>> Jeff?
> 
> Has this been merged somewhere?  I just checked net-2.6 and net-next and
> didn't see it.

Sorry, this thread was buried deep in an inbox.  Rescued and queued.

	Jeff




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