netdev - Re: [PATCH net-next] bnx2x: avoid TX timeout when stopping device

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Date:	Wed, 12 May 2010 14:19:15 +0300
From:	"Eilon Greenstein" <eilong@...adcom.com>
To:	"Stanislaw Gruszka" <sgruszka@...hat.com>,
	"Eric Dumazet" <eric.dumazet@...il.com>
cc:	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"Vladislav Zolotarov" <vladz@...adcom.com>,
	"Dmitry Kravkov" <dmitry@...adcom.com>,
	"Michael Chan" <mchan@...adcom.com>,
	"Breno Leitao" <leitao@...ux.vnet.ibm.com>,
	"Matthew Carlson" <mcarlson@...adcom.com>
Subject: Re: [PATCH net-next] bnx2x: avoid TX timeout when stopping
 device

On Wed, 2010-05-12 at 03:58 -0700, Stanislaw Gruszka wrote:
> On Wed, 12 May 2010 11:27:38 +0200
> Eric Dumazet <eric.dumazet@...il.com> wrote:
> 
> > Le mercredi 12 mai 2010 à 11:09 +0200, Stanislaw Gruszka a écrit :
> > > When stop device call netif_carrier_off() just after disabling TX queue to
> > > avoid possibility of netdev watchdog warning and ->ndo_tx_timeout() invocation.
> > > 
> > > Signed-off-by: Stanislaw Gruszka <sgruszka@...hat.com>
Stanislaw,

I like this patch - it does make a lot of sense. Thanks!

Acked-by: Eilon Greenstein <eilong@...adcom.com>

> > > ---
> > 
> > This reminds me I saw some strange things in bnx2.c for a similar
> > symptom.
> > 
> > Commit e6bf95ffa8d6f8f4b7ee33ea01490d95b0bbeb6e
> > 
> > Would you take a look at this too ?
> 
> I can send RFC patch for bnx2, and tg3 as I think it needs similar fix.
>  
> > Or if this kind of trans_start refresh on all queues is really needed,
> > it should be a core network provided function, not implemented on every
> > driver...
> 
> I think netif_carrier_off() should be used, since touching trans_start make
> timeout only less probable, but not prevent it. 

Eric,

I thought that your 1ae5dc342ac78d7a42965fd1f323815f6f5ef2c1 commit took
care of trans_start, right? Well, actually the commit that made it
possible to remove the trans_start manipulation.

Eilon


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