netdev - RE: [PATCH net v5 0/5] bnx2x: fixes

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Date:	Tue, 13 Aug 2013 14:16:37 +0000
From:	"Dmitry Kravkov" <dmitry@...adcom.com>
To:	"Benjamin Poirier" <benjamin.poirier@...il.com>,
	"Ariel Elior" <ariele@...adcom.com>
cc:	"davem@...emloft.net" <davem@...emloft.net>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"Eilon Greenstein" <eilong@...adcom.com>
Subject: RE: [PATCH net v5 0/5] bnx2x: fixes

> -----Original Message-----
> From: netdev-owner@...r.kernel.org [mailto:netdev-
> owner@...r.kernel.org] On Behalf Of Benjamin Poirier
> Sent: Tuesday, August 13, 2013 5:07 PM
> To: Ariel Elior
> Cc: Dmitry Kravkov; davem@...emloft.net; netdev@...r.kernel.org; Eilon
> Greenstein
> Subject: Re: [PATCH net v5 0/5] bnx2x: fixes
> 
> On 2013/08/13 12:38, Ariel Elior wrote:
> > > I'm confused. Wasn't "[PATCH net v4 1/6] bnx2x: properly initialize
> > > statistic counters" supposed to fix a race condition? According to
> > > earlier communication with Ariel:
> > > 	In this issue a race condition at driver startup causes a second
> > > 	statistics query to be sent before the first one completes,
> > > 	resulting in a firmware assert and a stuck chip. A patch was
> > > 	sent upstream fixing this:
> > > 	http://patchwork.ozlabs.org/patch/264810/
> >
> > As I explicitly mentioned in the communique which you quoted above,
> the patch was sent but not yet accepted.
> > This is precisely the upstream process - patches are being sent, reviewed
> and sometimes rejected and revised.
> > If you have further questions please address them to me - the technical
> forum is no place for this kind of discussion.
> > Thanks,
> > Ariel
> >
> 
> It's a technical question about a patch which was sent upstream. Where
> should the discussion happen if not upstream?
> 
> Let me rephrase my question:
> 
> I'm confused. I thought that "[PATCH net v4 1/6] bnx2x: properly initialize
> statistic counters" was meant to fix a race condition at driver startup which
> causes a second statistics query to be sent before the first one completes,
> resulting in a firmware assert and a stuck chip. Am I mistaken and there is no
> such race condition, or is it addressed by the other patches in this series?
> 
There is such condition, but it's not caused by wrongly initialized counted -
the initialization done in a correct way. Patch "[PATCH net v5 1/5] bnx2x: protect
different statistics flows"  - prevents from two outstanding queries to be sent
simultaneously.

Thanks
Dmitry



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