netdev - Re: BQL support in gianfar causes network hickup

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Message-ID: <1354023162.7553.1708.camel@edumazet-glaptop>
Date:	Tue, 27 Nov 2012 05:32:42 -0800
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	"Keitel, Tino (ALC NetworX GmbH)" <Tino.Keitel@...networx.de>
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 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)


This looks like we miss an interrupt ( or TXBD_INTERRUPT not correctly
set)

And it could be a bug occurring if we try to send one skb with fragments
and skb_shinfo(skb)->tx_flags & SKBTX_HW_TSTAMP 



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