netdev - RE: Atheros Communications Inc. AR8121/AR8113/AR8114 Gigabit or Fast Ethernet (rev b0) 1.0.0.7 md5/sha1 corrupted using NFS and samba (updated) Version 2

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Date:	Sun, 24 Mar 2013 06:12:08 +0000
From:	"Huang, Xiong" <xiong@....qualcomm.com>
To:	Hannes Frederic Sowa <hannes@...essinduktion.org>
CC:	Sven Hartge <sven@...nhartge.de>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: RE: Atheros Communications Inc. AR8121/AR8113/AR8114 Gigabit or
 Fast Ethernet (rev b0) 1.0.0.7 md5/sha1 corrupted using NFS and samba
 (updated) Version 2

And try to use following code to replace atl1c_configure_dma

static inline void atl1e_configure_dma(struct atl1e_adapter *adapter)
{
	struct atl1e_hw *hw = &adapter->hw;
	u32 dma_ctrl_data;

	dma_ctrl_data = DMA_CTRL_RXCMB_EN | 0x400000;
	dma_ctrl_data |= (((u32)hw->dmar_block) & DMA_CTRL_DMAR_BURST_LEN_MASK)
		<< DMA_CTRL_DMAR_BURST_LEN_SHIFT;
	dma_ctrl_data |= (((u32)hw->dmaw_block) & DMA_CTRL_DMAW_BURST_LEN_MASK)
		<< DMA_CTRL_DMAW_BURST_LEN_SHIFT;
	dma_ctrl_data |= DMA_CTRL_DMAR_REQ_PRI | DMA_CTRL_DMAR_OUT_ORDER;
	dma_ctrl_data |= (((u32)hw->dmar_dly_cnt) & DMA_CTRL_DMAR_DLY_CNT_MASK)
		<< DMA_CTRL_DMAR_DLY_CNT_SHIFT;
	dma_ctrl_data |= (((u32)hw->dmaw_dly_cnt) & DMA_CTRL_DMAW_DLY_CNT_MASK)
		<< DMA_CTRL_DMAW_DLY_CNT_SHIFT;

	AT_WRITE_REG(hw, REG_DMA_CTRL, dma_ctrl_data);
	return;
}


Thanks
Xiong

> -----Original Message-----
> From: Huang, Xiong
> Sent: Sunday, March 24, 2013 1:43 PM
> To: 'Hannes Frederic Sowa'
> Cc: Sven Hartge; netdev@...r.kernel.org
> Subject: RE: Atheros Communications Inc. AR8121/AR8113/AR8114 Gigabit or
> Fast Ethernet (rev b0) 1.0.0.7 md5/sha1 corrupted using NFS and samba
> (updated) Version 2
> 
> > > >
> > > > The caputered packets show that a 16 byte segment overwrites later
> > > > data in the same packet, sometimes even multiple contiguous 16
> > > > byte
> > segments.
> > > >
> > > > The corrupted packets look like this:
> > > >
> > > > ...ABC....DBBEF..
> > > >
> > > > Each character represents a 16 byte region, the dots are dont-care
> > > > placeholders. The BB-region is overwritten by the data of the
> > > > first B-
> > region.
> > > >
> > >
> > > It looks like a DMA issue. Not checksum related. :(
> >
> > Yes, I think so, too. Until this is resolved I would propose to not
> > set CHECKSUM_UNNECESSARY because it could corrupt data (like for the
> > original poster).
> >
> > Do you have any idea where how these errors could be resolved? I e.g.
> > could not reproduce it with FreeBSD and the driver seems to be related
> > to the linux driver.
> 
> 1.  pages cross 4GB bouandary ?  or overlap with each other ?
> 2. try to set hw->dmaw_block = atl1e_dma_req_128 3. can you print reg15C0
> content when the NIC is in normal tx/rx status ?
> 4. other possible may be related the diff register configuration, but it's very
> difficult to compare with Windows driver :(
> 
> Thanks
> Xiong