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

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Date:	Wed, 16 Oct 2013 07:37:20 +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

On Wed, 16 Oct 2013, Sergei Shtylyov wrote:

> Hello.
> 
> On 10/15/2013 11:28 AM, Guennadi Liakhovetski 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.
> 
>    I don't know what you mean by "slightly different form" exactly. Also, I
> was unable to locate the fresh -next tree.

git://gitorious.org/thierryreding/linux-next.git

> 'net-next.git' contains this patch
> in a mismerged form, 'net.git' has Simon's patch that corrects this mismerge.
> 
> > Thanks
> > Guennadi
> 
> WBR, Sergei
> 

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