netdev - Re: [PATCH] bnx2x: fix occasional statistics off-by-4GB error

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Message-ID: <CAHo-OowoWD_BT2W8ok32pcSmcshXttpErna-X92Ojz_A8es8iw@mail.gmail.com>
Date:	Mon, 18 Mar 2013 13:06:16 -0700
From:	Maciej Żenczykowski <zenczykowski@...il.com>
To:	David Miller <davem@...emloft.net>
Cc:	eilong@...adcom.com, eric.dumazet@...il.com, dmitry@...adcom.com,
	netdev@...r.kernel.org, yuvalmin@...adcom.com
Subject: Re: [PATCH] bnx2x: fix occasional statistics off-by-4GB error

Current best guess is UPDATE_ESTAT_QSTAT_64 which uses SUB_64
implemented via DIFF_64 which is crazy.

On Mon, Mar 18, 2013 at 12:54 PM, Maciej Żenczykowski
<zenczykowski@...il.com> wrote:
> I've reproduced this in the lab.
>
> I can confirm this patch fixes per-queue statistics (ie. ethtool -S
> "[0]: tx_bytes") - which previously were not monotonically increasing.
> However there is still a bug wrt. global device stats (ie. ethtool -S
> "tx_bytes" and /proc/net/dev transmit bytes).
> I'm guessing there's another similar bug later on during aggregation.
>
> I expect to find the offending code and send out a patch soon.
>
> On Mon, Mar 18, 2013 at 10:13 AM, David Miller <davem@...emloft.net> wrote:
>> From: "Eilon Greenstein" <eilong@...adcom.com>
>> Date: Mon, 18 Mar 2013 12:06:22 +0200
>>
>>> Maciej - thanks for the detailed information. You are right - it has
>>> nothing to do with the HW/FW and it is simply a bug that needs to be
>>> fixed. I withdraw my objections and add my ACK.
>>>
>>> Acked-by: Eilon Greenstein <eilong@...adcom.com>
>>
>> Applied and queued up for -stable.
>> --
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