netdev - Re: BQL support in gianfar causes network hickup

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Date:	Tue, 5 Feb 2013 14:00:56 +0100
From:	"Keitel, Tino (ALC NetworX GmbH)" <Tino.Keitel@...networx.de>
To:	Eric Dumazet <eric.dumazet@...il.com>
CC:	Tino Keitel <tino.keitel@...ei.de>,
	Paul Gortmaker <paul.gortmaker@...driver.com>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: Re: BQL support in gianfar causes network hickup

On Di, 2012-11-27 at 05:32 -0800, Eric Dumazet wrote:
> On Tue, 2012-11-27 at 13:42 +0100, Keitel, Tino (ALC NetworX GmbH)
> wrote:
> > On Di, 2012-11-27 at 04:36 -0800, Eric Dumazet wrote:
> > > 
> > > Can you reproduce the problem using a single cpu ?
> > 
> > Yes, it is a single-CPU system.
> 
> Can you reproduce the problem without PTP running, or disabled in the
> driver ?
> 
> (comment the "priv->hwts_tx_en = 1;" line)

I can't reproduce it with that line commented. However, so far I was
only able to reproduce it when starting the ptp2 client, so maybe this
is connected.

> By the way are any errata flagged in gfar_detect_errata() ?

This is from dmesg:

fsl-gianfar e0024000.ethernet: enabled errata workarounds, flags: 0x7

0x7 would be GFAR_ERRATA_74, GFAR_ERRATA_76 and GFAR_ERRATA_A002
according to drivers/net/ethernet/freescale/gianfar.h.

Regards,
Tino