netdev - Re: tg3: regression of netdev stats

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Date:	Fri, 1 Mar 2013 18:30:14 -0800
From:	"Nithin Nayak Sujir" <nsujir@...adcom.com>
To:	"Michael Chan" <mchan@...adcom.com>
cc:	"OGAWA Hirofumi" <hirofumi@...l.parknet.co.jp>,
	davem@...emloft.net, netdev@...r.kernel.org
Subject: Re: tg3: regression of netdev stats



On 3/1/2013 7:47 AM, Michael Chan wrote:
> On Fri, 2013-03-01 at 22:21 +0900, OGAWA Hirofumi wrote:
>> Hi,
>>
>> f4a46d1f46a8fece34edd2023e054072b02e110d (tg3: Prevent spurious tx
>> timeout by setting carrier off before tx disable.) seems to add the bug.
>>
>> On 3.8.1 (I didn't use 3.7.x series), "ifconfig" commands doesn't show
>> any stats, i.e. all stats are zero.
>
> No stats on an active device transmitting and receiving packets?  I
> don't seem to see the same problem, but we'll look into this further.
> Thanks.
>

Hi Hirofumi,
I too am not able to see zero stats with 3.8.1. I ran traffic and stats 
go up as expected.

Are you certain that the interface was up? Did you run ifconfig with 
traffic running on the interface?

Thanks,
Nithin.


>> And bisect points the above commit.
>> In fact, reverting the above patch fixes the regression of netdev stats.
>>
>> This patch looks like strange, and I'm not sure what this want to do.
>> Any ideas?
>
> Every time we reset the device (ethtool, MTU change, etc), we need to
> turn off all the tx queues before resetting.  As soon as we turn off
> these queues, if we don't turn off carrier, a tx timeout may be
> triggered if it's been more than 5 seconds since the last transmit on
> any of the tx queues.  These tx timeouts cause unnecessary concern to
> the user.
>
>>
>> Well, anyway, this is bug report.
>>
>> Thanks.
>
>

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