netdev - Re: [PATCH 2.6.29.1 1/1] 8139too: fix HW initial flow

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Date:	Tue, 21 Apr 2009 12:30:24 +0200
From:	Eric Dumazet <dada1@...mosbay.com>
To:	Amos Kong <jianjun@...ux.org>
CC:	David Miller <davem@...emloft.net>, jon.lin@...ics.com,
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2.6.29.1 1/1] 8139too: fix HW initial flow

Amos Kong a écrit :
> ...
>>> Unfortunately, this address is used by Linux kernel. So kernel panics.
>>> This patch fix it by setting up DMA buffer address before RX enabled and everything is fine even under broadcast packets attack.
>>>
>>> Signed-off-by: Jonathan Lin <jon.lin@...ics.com>
>> This patch does not apply, it was corrupted by your email client.
>>
>> I even think it has MS-DOS style newlines in it :-(
> 
> Another new patch :)
> 
> 
>  While ifconfig eth0 up kernel calls open() of 8139 driver(8139too.c).
>  In rtl8139_hw_start() of rtl8139_open(), 8139 driver enable RX before setting up the DMA
>  buffer address. In this interval where RX was enabled and DMA buffer address is not yet set
>  up, any incoming broadcast packet would be send to a strange physical address:
>  0x003e8800 which is the default value of DMA buffer address.
>  Unfortunately, this address is used by Linux kernel. So kernel panics.
>  This patch fix it by setting up DMA buffer address before RX enabled and everything is fine
>  even under broadcast packets attack.
> 
> Signed-off-by: Jonathan Lin <jon.lin@...ics.com>
> Signed-off-by: Amos Kong <jianjun@...ux.org>

Signed-off-by: Eric Dumazet <dada1@...mosbay.com>

Thanks Amos and Jonathan

> 
> ---
>  drivers/net/8139too.c |   10 +++++-----
>  1 files changed, 5 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/net/8139too.c b/drivers/net/8139too.c
> index 29df398..1fc4543 100644
> --- a/drivers/net/8139too.c
> +++ b/drivers/net/8139too.c
> @@ -1383,6 +1383,11 @@ static void rtl8139_hw_start (struct net_device *dev)
>  	RTL_W32_F (MAC0 + 0, le32_to_cpu (*(__le32 *) (dev->dev_addr + 0)));
>  	RTL_W32_F (MAC0 + 4, le16_to_cpu (*(__le16 *) (dev->dev_addr + 4)));
>  
> +	tp->cur_rx = 0;
> +
> +	/* init Rx ring buffer DMA address */
> +	RTL_W32_F (RxBuf, tp->rx_ring_dma);
> +
>  	/* Must enable Tx/Rx before setting transfer thresholds! */
>  	RTL_W8 (ChipCmd, CmdRxEnb | CmdTxEnb);
>  
> @@ -1390,8 +1395,6 @@ static void rtl8139_hw_start (struct net_device *dev)
>  	RTL_W32 (RxConfig, tp->rx_config);
>  	RTL_W32 (TxConfig, rtl8139_tx_config);
>  
> -	tp->cur_rx = 0;
> -
>  	rtl_check_media (dev, 1);
>  
>  	if (tp->chipset >= CH_8139B) {
> @@ -1406,9 +1409,6 @@ static void rtl8139_hw_start (struct net_device *dev)
>  	/* Lock Config[01234] and BMCR register writes */
>  	RTL_W8 (Cfg9346, Cfg9346_Lock);
>  
> -	/* init Rx ring buffer DMA address */
> -	RTL_W32_F (RxBuf, tp->rx_ring_dma);
> -
>  	/* init Tx buffer DMA addresses */
>  	for (i = 0; i < NUM_TX_DESC; i++)
>  		RTL_W32_F (TxAddr0 + (i * 4), tp->tx_bufs_dma + (tp->tx_buf[i] - tp->tx_bufs));


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