netdev - Re: tulip_rxtx_stop() on Cobalt Qube2

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Date:	Sun, 31 May 2009 23:02:22 +0200
From:	Florian Fainelli <florian@...nwrt.org>
To:	Grant Grundler <grundler@...isc-linux.org>
Cc:	netdev@...r.kernel.org, kyle@...artin.ca
Subject: Re: tulip_rxtx_stop() on Cobalt Qube2

Hi Grant,

Le Sunday 31 May 2009 03:40:36 Grant Grundler, vous avez écrit :
> Florian,
> Summary: proposed patch below for you to test (I've not tested it yet)
> and some explanation on what I think is happening.
>
>
> On Fri, May 01, 2009 at 12:38:57PM +0200, Florian Fainelli wrote:
> ...
>
> > Linux Tulip driver version 1.1.15-NAPI (Feb 27, 2007)
>
> ...
>
> > PCI: Enabling device 0000:00:0c.0 (0005 -> 0007)
> > tulip1: Old format EEPROM on 'Cobalt Microserver' board.  Using
> > substitute media control info.
> > tulip1:  EEPROM default media type Autosense.
> > tulip1:  Index #0 - Media MII (#11) described by a 21142 MII PHY (3)
> > block. tulip1:  MII transceiver #1 config 1000 status 7809 advertising
> > 01e1. eth1: Digital DS21142/43 Tulip rev 65 at MMIO 0x12082400,
> > 00:10:e0:00:88:b9, IRQ 20.
> > [snip]
> > 0000:00:07.0: tulip_stop_rxtx() failed (CSR5 0xf0660000 CSR6 0xb20e2202)
>
> Looking up these bits in the publicly available manual:
>     ftp://download.intel.com/design/network/manuals/27807401.pdf
>
> "Rev 65" == 0x41 == 21143-PD or 21143-TD (page 3-7)
>
> Operation Mode Register (CSR6ÂOffset 30H)
> ----
> bit : Val
> 31  : 1 Special Capture Effect Enable
> 30  : 1 Receive All
> 13  : 1 ST - Start Transmission
> 9   : 1 Full Duplex
> 1   : 1 SR - Start Receive
>
> Status Register (CSR5ÂOffset 28H)
> ----
> 28-31 : reserved
> 23-25 : 0x6 TX State = Suspended--Transmit FIFO underflow, or an
> unavailable transmit descriptor 20-22 : 0x3 RX State = Running--Waiting for
> receive packet
> 1     : 0x0 TX isn't stopped
> 0     : 0x0 No TX Interrupt pending
>
> The RX/TX engines are in a wedged state to begin with. :(

I suppose this is due to the Bootloader, either CoLo or the original Cobalt 
microservers bootloader.

>
> The normal calling path here is tulip_init() to register the driver
> callbacks and tulip_init_one() gets called immediately by pci subsystem.
> tulip_up() gets called after netdev registration when someone ifconfig's
> the device (ifconfig up). I don't know when else tulip_up() is called.
>
> I have two ideas on how to fix this:
> 1) reset the RX/TX engines in tulip_init_one() before tulip_stop_rxtx().
> 2) reset the RX/TX engines in tulip_stop_rxtx() if they are "wedged".
> 3) remove tulip_stop_rxtx() call in tulip_init_one()
>
>
> (1) seems like a reasonable thing to do at init time anyway.
> (2) feels like a pretty big hammer and I don't know all the side effects.
> (3) tulip_up() will reset the RX/TX engine and call tulip_stop_rxtx()
>    when the NIC is opene/ifconfig'd. Calling pci_set_master()
>    will allow the device to scribble into Host Memory...probably
>    should move that call to tulip_up() as well. But I don't see anything
>    in tulip_init_one() that requires DMA (and thus pci_set_master()).
>
> Is there any reason for NOT implementing (1) and (3)?
>
> I still need to work out where to call pci_set_master() in
> tulip_up(). If that's feasible,
>
> hrm. WTF. tulip_stop_rxtx() is called again from tulip_up() right before
> CSR6 is written. Earlier in tulip_up() we reset the chip.  Removed.
>
> Can you test the patch below?
>
> I have not tested or even compiled this patch...will do so on parisc/ia64
> machines once I get some feedback on this patch.
>
> And I just noticed pci_clear_master() is not called *anywhere*. :(
> Need to add such a call after tulip_stop_rxtx() some place (many places?).
> This patch is just RFC and not suitable for merging upstream.

The patch below does not help on my Qube2, I am still having the same message 
appearing.

>
> many thanks,
> grant
>
>
> diff --git a/drivers/net/tulip/tulip_core.c
> b/drivers/net/tulip/tulip_core.c index 2abb5d3..1aa058e 100644
> --- a/drivers/net/tulip/tulip_core.c
> +++ b/drivers/net/tulip/tulip_core.c
> @@ -470,11 +470,12 @@ media_picked:
>  		tulip_select_media(dev, 1);
>
>  	/* Start the chip's Tx to process setup frame. */
> -	tulip_stop_rxtx(tp);
>  	barrier();
>  	udelay(5);
>  	iowrite32(tp->csr6 | TxOn, ioaddr + CSR6);
>
> +	pci_set_master(pdev);	/* enabled DMA */
> +
>  	/* Enable interrupts by setting the interrupt mask. */
>  	iowrite32(tulip_tbl[tp->chip_id].valid_intrs, ioaddr + CSR5);
>  	iowrite32(tulip_tbl[tp->chip_id].valid_intrs, ioaddr + CSR7);
> @@ -1422,11 +1423,6 @@ static int __devinit tulip_init_one (struct pci_dev
> *pdev, tulip_mwi_config (pdev, dev);
>  #endif
>
> -	/* Stop the chip's Tx and Rx processes. */
> -	tulip_stop_rxtx(tp);
> -
> -	pci_set_master(pdev);
> -
>  #ifdef CONFIG_GSC
>  	if (pdev->subsystem_vendor == PCI_VENDOR_ID_HP) {
>  		switch (pdev->subsystem_device) {



-- 
Best regards, Florian Fainelli
Email : florian@...nwrt.org
http://openwrt.org
-------------------------------
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