netdev - Re: [PATCH] net: sh_eth: Fix RX packets errors on R8A7740

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Date:	Tue, 15 Oct 2013 09:28:15 +0200 (CEST)
From:	Guennadi Liakhovetski <g.liakhovetski@....de>
To:	Sergei Shtylyov <sergei.shtylyov@...entembedded.com>
cc:	Nguyen Hong Ky <nh-ky@...so.co.jp>,
	"David S. Miller" <davem@...emloft.net>, netdev@...r.kernel.org,
	Ryusuke Sakato <ryusuke.sakato.bx@...esas.com>,
	Simon Horman <horms@...ge.net.au>
Subject: Re: [PATCH] net: sh_eth: Fix RX packets errors on R8A7740

Hi Sergei

On Sat, 12 Oct 2013, Sergei Shtylyov wrote:

> Hello.
> 
> On 07-10-2013 8:29, Nguyen Hong Ky wrote:
> 
> > This patch will fix RX packets errors when receiving big size
> > of data by set bit RNC = 1.
> 
> > RNC - Receive Enable Control
> 
> > 0: Upon completion of reception of one frame, the E-DMAC writes
> > the receive status to the descriptor and clears the RR bit in
> > EDRRR to 0.
> 
> > 1: Upon completion of reception of one frame, the E-DMAC writes
> > (writes back) the receive status to the descriptor. In addition,
> > the E-DMAC reads the next descriptor and prepares for reception
> > of the next frame.
> 
> > In addition, for get more stable when receiving packets, I set
> > maximum size for the transmit/receive FIFO and inserts padding
> > in receive data.
> 
> > Signed-off-by: Nguyen Hong Ky <nh-ky@...so.co.jp>
> > ---
> >   drivers/net/ethernet/renesas/sh_eth.c |    4 ++++
> >   1 files changed, 4 insertions(+), 0 deletions(-)
> 
> > diff --git a/drivers/net/ethernet/renesas/sh_eth.c
> > b/drivers/net/ethernet/renesas/sh_eth.c
> > index a753928..11d34f0 100644
> > --- a/drivers/net/ethernet/renesas/sh_eth.c
> > +++ b/drivers/net/ethernet/renesas/sh_eth.c
> > @@ -649,12 +649,16 @@ static struct sh_eth_cpu_data r8a7740_data = {
> >   	.eesr_err_check	= EESR_TWB1 | EESR_TWB | EESR_TABT | EESR_RABT |
> >   			  EESR_RFE | EESR_RDE | EESR_RFRMER | EESR_TFE |
> >   			  EESR_TDE | EESR_ECI,
> > +	.fdr_value	= 0x0000070f,
> > +	.rmcr_value	= 0x00000001,
> > 
> >   	.apr		= 1,
> >   	.mpr		= 1,
> >   	.tpauser	= 1,
> >   	.bculr		= 1,
> >   	.hw_swap	= 1,
> > +	.rpadir		= 1,
> > +	.rpadir_value   = 2 << 16,
> >   	.no_trimd	= 1,
> >   	.no_ade		= 1,
> >   	.tsu		= 1,
> 
>    Guennadi, could you check if this patch fixes your issue with NFS. Make
> sure it applies to 'r8a7740_data' (it was misapplied to DaveM's tree).

Yes, the current -next, which includes this patch (in a slightly different 
form) boots fine over NFS for me.

Thanks
Guennadi
---
Guennadi Liakhovetski, Ph.D.
Freelance Open-Source Software Developer
http://www.open-technology.de/
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